The TRUTH behind the Garrett G25-660, and why people keep getting it wrong- Sizing turbos right...!

[@JohnDohBoy]

5 minutes of credible information in a 36 minute video.

[@aftastosk6016]

Excellent presentation, thank you. Most people don't understand the G series. These that they seek to "upgrade" (so go for example from some form of 2860 to a G25-550) don't understand that if their engine is not able to get more boost AND be able to keep this boost up to the rpm as before this "upgrade" doesn't make any sense. The ones that they are downsizing don't understand that they need a much bigger housing than before and even with the bigger housing the boost may drop off faster than before. In both cases don't understand that if you simply do a swap without alter/upgrade the supporting mods, the danger of overheating is nearby. all this is partly fault of Garrett that they present it as the next best thing and not what they really are but mostly is ingorance of the tuners that they work on the same basic turbochargers for decades so the various versions of 2860s or from T3/T4s to the various GT/GTX3076s and they don't understand the engineering theory (the fluid mechanics) of turbochargers.

[@StavTech]

Yeah I agree totally. A lot of the misunderstanding is because of Garrett selling and promoting them the way they did, which is kinda understandable as it did get sales, but because of the sales speak a lot of people did/do believe they’re magic and end up with a disappointing result. People find it hard to understand that there’s no magic, physics is physics, but hopefully enough people see this vid and do realise!

[@aftastosk6016]

@@StavTech Exactly. If Garrett would had named the G25-660 for example GTR2867 and specify that these series of turbochargers are aimed mainly at the high-end of the tuning market or for racing applications it would had been much better. I appreciate the fact that you are brutally honest.

[@StavTech]

@@aftastosk6016 yeah I’m no BS no matter what. These are brilliant turbos, but what the suitable application is is not what people think quite often, and that’s because of the sales talk unfortunately lol 😂

[@aftastosk6016]

​@@StavTech yeah promotion make people think "oh my disco potato (or td05 etc) is old now, next gen is here, I need to upgrade" but for someone that has a professional background these are BS really...I am looking forward for your next uploads!

[@shaban2374]

@@aftastosk6016 Now you make me more confused !!. i m thinking of turbo my hayabusa,,its a gen1 att olmost 1300cc think its 1290cc and i was thinking of turbo charge it,i asked a turbo seller and he offered me a turbo with 1,09 housing with ,,was it 50mm or 60mm turbo,i was thinking bighousing and will it spool..my target is 300whp and mayybe more if not content..how do you callculate how much your exhaust pushes out so you can choose right turbocharger,,i tought these g25 turbos where small even if they can manage 600hp,,,how do you determine your turbo size ?

[@konradklisiak2273]

Just in the process of fitting a g30-660 .83 to my 1jz. great video and infomation thanks!

[@StavTech]

That will spool like a beast and make big power, great choice I think

[@konradklisiak2273]

@@StavTech I will try and post up some real world numbers once it’s all dialled in 30-100 etc. The setup is in a S-chassis so should be quite lively 😁

[@pourtierbeatz7804]

Any update man i am looking to see if this turbo will pass that 500whp mark! I got a 1jz vvti with 264 cams!

[@Frediv_the]

Any update on your setup bro I also have 1jz vvti with 264 cams in s13 lol

[@mandytuning]

Adam z on hiz 1j have the clone of g30-660 from Pulsar 5455,and it made 605hp killer spool

[@802Garage]

They are great turbos, far better than the ancient tech Garrett was using until the G-Series. Part of why nobody can make 660HP on a G25-660 is because the horsepower number is overrated. Generally max is about 10% lower than the claimed number for any G-Series. It's in the compressor maps. In general, the Borg Warner EFR is superior and can also be had cheaper with more included features. Plus it will meet or exceed its horsepower claims. That's my key issue with the G-Series. It doesn't really make sense over the EFR except to have the name. Many of the BW Airwerks turbos actually have compressor maps comparable to G-Series for 1/3-1/4 the price, which also makes the Garretts a hard sell. I'd say they are easily the second best aftermarket performance turbo in terms of pure performance though, from everything I've seen.

[@xXAsunaxKiritoXx]

This is the reason why im bolting on a efr turbo on my mk3 supra than Garret.

[@802Garage]

@@xXAsunaxKiritoXx Great choice, IMO!

[@GCast-iv1pd]

I don't know where you're from but the EFR is actually more expensive here in Australia. Take the EFR 7163 for example, it cost 1k more than a G25-660

[@xXAsunaxKiritoXx]

@@GCast-iv1pd State side.

[@802Garage]

@@GCast-iv1pd I'd have to look at pricing there, but yes I'm in the USA. Since the EFR is a US product while the Garrett is global, that's not too surprising if so.

[@otacon4065]

I'd love to believe you, but your lack of 70s music and the fact a plumber never called, puts me in doubt.

[@StavTech]

That’s later in the vid, and you posted so early you defo haven’t watched it all lol 😂

[@otacon4065]

@@StavTech "bow chika wow wowwww" 😂

[@azmartin1977]

Also to allow more exhaust flow garret went from a 10 blade turbine wheel to a 9 blade turbine wheel in the G series and they also have a wider entry point from the turbine housing too the turbine wheel. That's what my GTX 35-84RS turbo's are like as well, which where sort of the step from GTX 35-82 to the G35's.

[@haydnpaull5447]

Exactly. "no magic there" well there is and it's called trim.

[@JackTheLad10]

Stav Ive just got a built 2.0 Astra VXR and Im looking to get it to 400 WHP but I dont want to live at 4000+ revs all the time for power, would the g25-660 be a good option would the g25-550 be a better option? cheers

[@2jzmr246]

With my mr2 the boost was 4.2k to 8k rpm. 1.9 bar peak, had progressive boost. Made roughly 480 whp. G25 660. I was 425 whp on 1.3 bar. 4.2k rpm 660 .92 ar. I heard the. 7ar improved the spool by 250 to 300 rpms So id imagine the 550 .7 ar would be mid 3500 rpms?

[@2jzmr246]

Made 570bhp with pump fuel on my mr2. 2.0engine. Water meth. 1.9 bar of boost. G25 660. 92ar. 4k power band was an awsome turbo. Moved onto a supra and will probably look at the G series again. No idea which set up yet Great video!

[@StavTech]

Great result! Good turbo and a/r choice too, that’s what I’d go for with those goals too.

[@swfautoworkx5951]

I made 590 WHP on one of these using One ethanol R

[@1fastmx5]

Thanks for this presentation it was helpful. I have a Toyota 2zz built in my Lotus and it is currently making 400 wheel horsepower with a gtx2867r 18psi E85. I wanted to get faster spool and maybe a little bit more on top and with this new generation turbocharger. What would you suggest the G25 550 with AR .92 or a G25 660 with AR 72. Thank you in advance. Looking for that best balance

[@SpeedDemonExpress]

Update with your results and what turbo you used. I'm looking to turbo my Elise. Thanks.

[@1fastmx5]

@@SpeedDemonExpress haven't done it yet... I'm thinking the new G30 might be better

[@SpeedDemonExpress]

@@1fastmx5 I'm thinking that's way too big if you don't want lag. I'm thinking the g25 550 looks good for me. I only want 300-400hp and the fastest spool possible. The compressor wheel is pretty efficient and that means less heat.

[@SpeedDemonExpress]

@@1fastmx5 what turbo manifold are you using? I'm looking for one.

[@1fastmx5]

@@SpeedDemonExpress I'm using the Forced Fed Tubular Manifold. I'm thinking getting the G25 660. I would like to make 500whp

[@oldandboosted]

You are correct. Turbos are fucking awesome. My pair of mirror 62/62s for the Gen 3 hemi Challenger just arrived this week.

[@juniwalk]

Hello @StavTech, I know this is kinda old video, how ever could you help me choose? I am looking for turbo for my BMW M54B30, 3.0 liter with VVT on both cams making 230HP. It is undersquare engine making peak torque of 300Nm at 3500rpm.I'd like to make 400-450 HP with fast spool for street driving. Right now I am looking at PSR 5455G which is copy of G30-660 with .82 A/R housing. Would that be wise choice for me? Would G25-660 equivalent be better?

[@MrDamocell]

Great video, thanks for making it Considering either a g25-660 or g30-660 both with 0.72ar and IWG for my 2.8 v6 Saab. Engine doesn’t really like to rev past 6000 and I’m aiming for 450whp. Which would you recommend?

[@NeonPinkful]

Go with the g25. It has a better spool and will deliver 450whp no problem

[@albertaco24]

@@NeonPinkful what g25 is the better spool and housing for a Max of 450bhp thats I Want Between 380-450 bhp thx

[@Spextre]

Doing a G25-660 turbo FA24 out of an NA GR86. Would .72 choke it, making me need a .92? Or will .72 be fine?

[@Banj95]

Thanks for the informative video! I'm planning to upgrade to the G25-660 with .92 AR on my 3S-GTE which currently has a 20G. Should be a huge improvement!

[@blakeslide6919]

How did you like the 20g? Proper old school turbo sound from the 20g lol.

[@Banj95]

@@blakeslide6919 It won't hold a candle to quicker-spooling modern turbos of the same or larger size but it's still a lot of fun especially for the money. Set to 15 psi on my RAV4 with the 3S-GTE motor, hits full boost around 3500-3800 RPM depending on gear and then pushes me back hard from there. Certainly a big upgrade from stock. I have a screamer pipe too so it sounds like a jet taking off hahaha!

[@Poindexters-Obsession]

Thanks for the video. I've got a weird one I'm trying to make a decent choice for a engine build. 5.7 L cadillac flathead from 1946. RPM limit will be about 5000. Original advertisements listed the stock engine at 160 hp. Stock compression is 7.25:1. Volumetric Efficiency is probably ~70%? I'm thinking twin G25-550, but I'm only shooting for 300-500 hp. The low hp relative to the turbo rating and small turbine side choking the exhaust worry me. Any idea if I'm in a reasonable range? I haven't found much info for flatheads or otherwise low VE engines.

[@chippyjohn1]

by modern standards with 100% VE your engine should produce about 290KW at 5000, as opposed to your 118KW at 5000. The engine has a VE of about 40%.

[@markchacon5971]

I’m new to turbo setups ! Great video thank you ! What’s your opinion on a g25-550 on a k24a2 from why I think is torque will come on really early and I don’t think the stock rods will hold up 🤣

[@olicarlton2820]

I’m also interested in which of these new g series would suit a k24 best, initially i thought these but looking at compressor maps made me think otherwise

[@hendrahendra]

Low end torque are what bends rods. Play it safe and use a bigger rear housing to keep the low end power in check.

[@rubeneeltink8607]

Hello stav, bit late to the vid, but I was wondering, I have a 2.0L saab B204 engine waiting for a turbo, I would like to end up at around 450hp (stock internals are good for 6-700hp). I was thinking of going with this turbo, but which exhaust housing should I use? I would like to get the fastest spool possible with this hp goal in mind. Engine revs to about 6k

[@StavTech]

At 450 I’d run a G25 550 with something middle ground, like a 0.72 housing. Defo no smaller

[@2006chunming]

Yeah, 600 on such a tiny frame! Is incredible! Probably spools instantaneously because of they're size. Twin turbo set up would be amazing!

[@dennisrobinson8008]

Supposedly spools 25% earlier than the equivalent gtx

[@demartthorne7368]

So what G series housing would you recommend on 1.5 liter ..G25-550 .49AR or .72?

[@simongoode7812]

This video is some true car porn 😂 lol It's great how you explain how they flow & how to pick the correct one and Thomas's work is absolutely amazing!!! 👌🏼

[@Star.Chaser]

Hypergear makes them for 1/4 of the price, 585whp on 20psi iwg, full boost from 4k, basic bolt ons unopened rb25det neo. Can spin up to 36psi that I’ve seen so far from results.

[@Beardchanics]

all symmetrical is going to look damn sexy when they're in!

[@chippyjohn1]

The turbine doesn't flow 600hp, it flows less than half of that. At that power, most of the exhaust gas will bypass it through the wastegate. The turbine flows a maximum of about 240hp. G30 about 300hp, G35 bout 350hp etc at their largest AR. It is the compressor on the G25-660 that flows about 600hp, not the turbine.

[@StavTech]

You say that like turbine size doesn’t matter and you just need enough wastegate and any hot side can make whatever power you want. If only turbos worked like that

[@chippyjohn1]

@@StavTech I didn't say it doesn't matter, just that you said the turbine flows 600hp which it doesn't. Thanks for the video, hope the project went well.

[@StavTech]

@@chippyjohn1 flows enough for a typical 600 horse engine. Ie what actually matters

[@shaban2374]

How do you determin turbo size ?? example if im to turbo a motorbike that is a 1300cc and goes upp to 11k rpm pushing around160whp naturally and engine is 11-0 -1 comp naaturally aspirated.

[@lancereyesromero7811]

I have a volvo 5 cylinder B5254t4. I want to have at least 500hp. Also will spool very fast. Is this the right one to get? I was thinking Xona Rotor 71-64. So much options. Can't think of what to get. Any suggestions?

[@orangutanfan3179]

Mamba GTX2871 with the D5 turbine wheel and .71 T3 housing.

[@jardim23]

Stav, would you recommend the 550 for a volvo 2.3 t5 with a 400bhp goal? I was thinking of a GT2871 but when i heard about how fast these spool i kind of wanted to go with one. I feel like the 550 could reach the power goals i need with a faster spool than my current 19T while being somewhat under utilized.

[@StavTech]

Yes, would be great in my eyes too. Middle sized housing like ~0.82 or whatever there is and it should spool great while still revving out at the top end nicely too

[@wullie.1der]

Thanks for the video...i plan on fitting the g25-550 or gtx2867r 0.64ar to my Mercedes om606 3.0 diesel engine but unsure which is the right one for best spool /low end power. Seems strange that hardly anyone fits these turbos to diesels. Any thoughts? Thanks

[@dennisrobinson8008]

The point of the g25 over the gtx2867 is it spools 800 rpm earlier and makes similar top end power. So the G series makes better lower rpm torque than the gtx.

[@Drunken_Hamster]

So in my vehicle I'm gonna have, short term, a Mazda Duratec 2.3-2.5 4-cylinder, and long term, either a 2.7 Ecoboost V6, or a Honda J-series. I... Don't really want to have to save up to buy either two different turbos or an additional turbo in the future if/when I go to the V6, so my question for you is: What should I pick that'll give decent spool and top end on the Duratec, but not be choked on the EB or J-series V6? Short term goal power is 330 lb-ft brake (max my stock trans can take), and I don't care to rev past 7000 (max the gauge goes up to). I want like 5 pounds of boost around 2500 RPM since 2000-3000 is my cruising RPM. Long term goal, I don't really care for more than 700 wheel tops, with the same drivability goals in the cruising RPM range. I have a feeling you might just say "buy once cry once" and do my long term goal and swap now... IDK. *EDIT for notes:* 9:15 Compressor Inducer/Turbine Exducer are the important measurements for ballparking turbo size. And I'm gonna go ahead and extrapolate that it's about 1mm/lb of flow, and 10hp per lb per mm that you'll generally get, barring stuff like Garrett's extreme efficiency design. I don't have any "extrapolation" for the turbine side, yet, though. Need to learn more, first.

[@Ej6daniel]

Get the Honda/Acura V6 J series

[@Drunken_Hamster]

@@Ej6daniel Yeah, despite being semi-open deck and good on boost, I learned the 2.7 EcoBoost has some undesirable traits. Those being a water-cooled and integrated exhaust manifold. I hate integrated exhaust manifolds, and a water-cooled exhaust is just the dumbest thing for a turbo application, so I'll be nixing that idea. Sadly the J-series comes in 3.5L for the "ideal" finds, so I'll probably have to double down and get a second turbo, or buy a new one entirely if/when I go from phase 2 to phase 4, lol.

[@exvils]

I didnt know when i was watching this years ago, that i would get one exacly year later :D

[@Weihrauch88]

I am very interested in this particular turbo for my S2000.... 0.92AR but internally wastegated... hoping it'll flow well enough not to suffer with boost creep as the F20 head is so effective.

[@mihailpetrovici5044]

I get boost creep on a d16, the manifold design matters more

[@bryandion2726]

I have to say I loved this video. Lots of knowledgeable information that i feel will be beneficial to me for my build. I’m planning on using the G25-660 now I just have to figure what size to pair it with.

[@loustath1583]

Not bad turbo hopefully they’ve improved the bearing housing water cooling capacity!

[@davidjiang2nd]

Would twin Garrett G25-660 turbos be a good setup for a rb26 2.6 liter running 1200 bhp?

[@StavTech]

Yes, I’d say so, something small capacity like that is what can max out a g25

[@R2D2G7]

Will g25-660 fit to BMW m30 3430cc? The goal is to spool as low as posible and achive smth around 530 hp on crank

[@StavTech]

Personally I’d go for a G30 as with almost 3.5ltr you’d want more turbine wheel than a G25 in my opinion. Even G30 is very small for that capacity but if you want spool as low as possible it should be ok.

[@R2D2G7]

@@StavTech Thank you for your quick answer! One thing that I missed - the engine is I6 12v. Will g25 suitable for it to rev up to 6000-6500(to rev higher is no need)?

[@nicolai1246]

I have been trying to figure out if the g25 or g30 for my sr20vet rwd swap. Would the g25 turbo choke out with the ve head? I guess I am looking for a responsive turbo that doesn't choke out up top ( I really don't think that is possible, either very responsive and chokes out up top or really laggy but strong up top)

[@elitecol69]

I'm in the same boat. Ve head, currently have a 2867r gen 2, and it chokes. Not sure if g25 .9 or g30 660, which did you choose?

[@nicolai1246]

@@elitecol69 Sorry for taking so long to reply 😅 I actually haven't got one yet.. but I am thinking a G25-660 .92 so I can keep bottom mount and maybe run 450-500whp? this will still be a street build and I don't think I need 600+hp. I still want a comfortable ride

[@elitecol69]

@@nicolai1246 all good, I already went for the g25 660 .9 and in pump 98 it made 440whp, 330kw at the wheels. And then ran out of injectors. 1000cc

[@pourtierbeatz7804]

Will the g30-660 .83 hit 500whp on a 1jz vvti with 264 cams? I keep hearing backxnad forth things

[@802Garage]

Of course it would if you turn up the boost enough. The question is where in the RPM band?

[@bradclarke6016]

going from a GTX 2867r Tial .91 to a g25-555 in a race sled. Was 260 ish on 110, testing "91 pump" now. should be interesting

[@CaptainSensible]

Super informative video 👍 it helps a layman like me understand the purpose and 'niche/application' for these new units. Especially in regards to form factor and space constraints! I'm fortunate as a fellow Volvo 940 owner that engine bay space is available in spades, so fitting a big 'ol (and most importantly, cheap 😁) truck turbo is no big deal 😅. I can definitely see the appeal of these for those with the right budget though! The super-duper turbine wheel material used on these has me wondering if aftermarket companies will eventually offer replacement/upgrade turbine wheels for popular existing turbos like they do with billet compressor wheels.

[@StavTech]

Cheers! The Mar-M shaft is no big deal, used on lots of stuff, I had a MarM turbine wheel on a old Garrett T3/4 on my Cossie back in 2001. Better turbine wheel designs for stock turbos are defo a good thing, and a few places sell them, Mamba do them, the CT26 on my Corolla runs one, big big improvement!

[@CaptainSensible]

@@StavTech ahh cool, I didn't realise it was already used elsewhere! 😎 I also agree with what you said about the little features and touches on turbos, they give a piece of machinery some character, I feel.

[@FirstLast-tx3yj]

@@StavTech the time of oversizing turbos is long gone These 2 are going on a 6.0 w12 I was wondering whether i should do 660 or the 550 for my 6.0 LS 800hp

[@StavTech]

@@FirstLast-tx3yj it’s not long gone, turbine flow is turbine flow, it’s not magic, physics hasn’t changed. Bigger capacity needs more turbine flow for any given power regardless of what the compressor is rated to. The comp maps will tell you what out of them two you’d wanna run, as the turbine side is the same, but I’d 100% run the biggest turbine A/R. Personally I’d run G30s bare min, but I don’t subscribe to this tiny turbo thing, pre turbine backpressure takes more than it gives imo. Depends what you want from the engine, what you want it to do

[@FirstLast-tx3yj]

@@StavTech drifting but its also a street car so response is king. And a medium fat power curve is what i am looking for. In the old days twin gt35 was the goto but now i want either twing 660 or twin 550

[@tomasbegley3032]

looks like some nice hardware

[@shawnbeharry3786]

One of theses on a RB20DET....... pure bliss!!!!!!!!!!!!!!!!

[@iNeedMorePSi]

Which G25-660 .92 or G30-660 .83 For Toyota 2zzfe? Which is better for spool?

[@StavTech]

G25 is faster if both single scroll as it’s smaller. What your choice is depends on power goals etc

[@StavTech]

G25 is faster if both single scroll as it’s smaller. What your choice is depends on power goals etc

[@hellaspower7546]

You think a g30-900 with the 1.06 twin scroll housing would be a good match for a n54 engine in a single turbo application? Looking for 700 crank hp

[@StavTech]

Personally I’d want G35 on something of that capacity, not convinced the turbine flow of a 30 is enough for an engine that size

[@hellaspower7546]

@@StavTechI'm looking for maximum response, comparing the turbine flows the g30 turbine in the 1.01 housing flows as much as the gtx3582r in a 0.83 housing. If I run out of steam after 6500rpm that's OK for me. The stock head doesn't flow particularly well after that rpm range. Opinions?

[@StavTech]

@@hellaspower7546 personally I’d never run something as small as a GTX35 turbine side either on a N54 looking for a genuine 700, but that’s just me. G30, GTX35, either or, it’s about the same flow and for me personally that’s not what I’d choose on an engine that size looking for that power. But it’s just my opinion.

[@hellaspower7546]

@@StavTech Oh I see. So a G30 would be more inline with 600hp I guess? And for everything above the G35? You think there would be a big difference in transient response? Keeping the car in the right rpm range isn't hard, since it's a DCT. I do mainly run twisty roads with my Z4 so I want to keep to as responsive as possible when on and off throttle.

[@y2khatsko]

What spec would be ideal for a 2.0 liter 4g63 fully built internally. To make 500-550?

[@StavTech]

Presuming fully build includes cams etc, personally I’d go for the 0.92 turbine housing

[@y2khatsko]

@@StavTech yes my evo is completely built. It made 670whp on my FP zero ball bearing turbo. what rpm would this 660 be at full boost ? I’m looking to track / auto cross the car.

[@glanzaturbo]

Hi, would you recommend a g25-660 .71 housing for a 4efte turbo starlet running 20-25 psi. I currently have a gtx gen23076r with a .63... I get full boost at 5500 and rev to 8000

[@glanzaturbo]

@Heffalompen went to a 3071r with a .49 housing. full boost at 4000 now... thanks

[@danielalcazar8160]

What should I put on my Type R FK8 K20C1 for maximum power/response for circuit? Thanks!

[@John.Azucena]

for circuit your better off with stock turbo

[@neophreak85]

i thinking of G25-660 Turbo 0,72 on a volvo 2,5L 4 cyl 16v turbo over garrett 3071R. do i do the right thing then? /joans

[@StavTech]

I think personally on a 2.5 I would go for the bigger turbine housing. Or a G30-660 with a smaller housing.

[@itsmatty365]

fantastic video.. lots of good info these are confusing still lol any sizing help with the 660's for a 2.0 k20 series I don't want to spend all the $ for the wrong set up .72 or .92 got all my internal parts now looking for the turbo for around 550 bhp

[@MrDannnnnnnnnnn]

Hi great video, in your opinion would a g25-550 with a .92 be a good match for a rb25det looking for a quick spooling 400bhp?

[@StavTech]

Yes

[@albertaco24]

@@StavTech im on a focus rs mk1 2.0 zt turbo engine using now gtx2867r (0.71ar) and im at 398bhp , I would like to get a turbo with best spool as possible and that maxed about 450bhp what turbo and size you recomend?

[@debodevil6974]

Have you ever had any experience with HX52 on a 3.0 engine? Do you think it would spool ok with a 14cm2?

[@NeonPinkful]

You will have a lot of turbo lag with that massive jb turbo

[@pec1739]

wish there are even smaller G-series ones (not GBC series) G17, G15

[@michaelokeeffe490]

38 degrees at what angle from the cutting blade? I need to make a 6-1 collector

[@eazygfx4815]

So for my 1.4TFSI the 550 would be best? (Though i wouldn’t want near 500bph😂) about 250-300 would be more than enough for my fwd audi

[@StavTech]

550 with the smallest turbine housing would be plenty for that

[@craigebaker1]

I'm trying to figure out turbo sizing for my 4b11T, but can't find the VE rating for it. Do you have any info on this to help me with sizing?

[@bradclarke6016]

garrette boost advisor

[@thangcacdi]

So if im running a k24 honda engine, a 2.4liter 4 cylinder and im looking for 500ish BHP would the G25-660 .72ar good? Looking for responsiveness over anything .

[@StavTech]

IMO, unlesss you don’t mean the 160bhp versions of the K24 no. Too small for the ones that are ~200 stock. They like to rev. A small turbo wanting to make all the grunt at low rpm fighting an engine that likes to make power up top is literally a backwardsland combo. Worst of both worlds. Bearing in mind you can run a turbo the size of the moon and still get far more power even at 3k than you do n/a on a K20A2/A3. And if you really want massive power before you even reach the stock vtec engagement point, you’ve bought the wrong kind of engine IMO. I’d run the .92 housing bare min

[@thangcacdi]

Stav-Tech Stav-Tech yeah im talking about the high compression one with 200hp. I see what youre saying, so then if i size up to the G30-660 or 770 with a .92ar would that be better for responsiveness without getting choked up top?

[@StavTech]

@@thangcacdi as I say in the video, the biggest 25 660 turbine housing only flows roughly what the smallest GT35 one does. So that’s bare min I’d want on a K24, and that would still be full boost long before the engine gets in to its natural powerband. Would be a hell of a powerband, but I think I’d still prefer a G30 size turbine wheel on a K24

[@thangcacdi]

Stav-Tech great! Thanks much for the advice. I will be going G30-660 .92ar then. I don’t plan on making anymore than 600crank hp. Im looking for 500wheel hp. It’ll be going into my MR2. Now i just need to find a top mount manifold.

[@BB-pf2cs]

Tom Hardy gave a great breakdown here😂

[@albertaco24]

Best spool turbo for a focus rs mk1 2.0 zt engine to hit 430bhp?? Im on a gtx2867 and hits 390 bhp

[@StavTech]

A G25 550 is probably the one if you can justify the price. A 2867 should easily be able to make that number if you turn it up though

[@chaseteter]

I am very happy with my G25-550 on my 1.8 liter LS/V I went with a Pulsar for under $1k USD shipped and it’s held up for 30k miles so far. 400whp on 93 and it has some headroom yet.

[@kartman707]

​@@chaseteterwhat rpm does it start to spool? And what rpm does it hit full boost? Whats your max boost level? Tia

[@iuryperuzzo7793]

Nice vídeo! Can you help me? A can put a 550 or 660 in a Citroen Ds3 thp 1.6 forged engine.. good spool with good top end, in my country g25 is dificult tô see…

[@tomasbegley3032]

what's the k24 in the background going into?

[@StavTech]

Go subscribe to Thomas’ channel, you’d know all about it

[@tomasbegley3032]

@@StavTech haha you got me there, heading over now XD

[@Gary_Bocking]

I did a Google and found a post off club gti forum... As for meaning of Badger5.. My full family name is William Henry Brockbank V (5th). Brock in ol ye english is Badger. Now my family clearly were'nt too imaginative on the name front as my father is also named William Henry Brockbank IV as was his father III, his fathers father II, and his fathers father father I. Makes me the 5th of the dynisty = 5 Add Badger to the 5 you get Badger5. means nothing really, but kind of does to me.

[@M_arias]

What’s the difference between the reverse rotation?

[@StavTech]

The difference is it’s reverse rotation

[@idontwanttopedal]

Was looking at going with pair of efr7163 on my r35 gtr but I wounder how these will compare to them

[@802Garage]

The EFR is superior in almost every respect. The G-Series is good, but the EFR is better.

[@802Garage]

Check out the channel TurboDirect S.A for tons of info.

[@idontwanttopedal]

@@802Garage thank you will check it out

[@802Garage]

@@idontwanttopedal Long videos, but very worth it. Just search the channel for EFR and look at all the comparisons. Let me know what you think if you see my comments over there haha.

[@leonardotraple2993]

Hello Sir. i got really inspired by your w202 drift build. I'm from Brazil... would you mind sharing what PU bushing kit you put on the car? thank you sir!

[@StavTech]

Hi, thanks 🙏. The kit I can’t even remember where it came from, I think I found it advertised on eBay and came from Poland, but it was many years ago so I can’t remember now!

[@leonardotraple2993]

@@StavTech Thank you very much for your time... i'm having hard time trying to buy the bushing... the other items was very easy... any help will be much apreciated... congratulations for the new projects... very impressive evolution!!

[@leonardotraple2993]

Sir, watching the video for the ten times i found what i was looking for... you make the great jogo of putting a paper with the store where you bougth on a frame... thank you very much!!!!

[@abdullahz4804]

Hey stav where is the W210 E55 trunk mounted turbo now?

[@StavTech]

No idea. Sold it, not seen it since.

[@abdullahz4804]

@@StavTech Oh i see, was the coolest project you ever had in my opinion. Hope it's still alive and running not wrecked. How much did u sell it for?

[@StavTech]

@@abdullahz4804 yeah I’ve really no idea where it is now. Sold it very cheap, think it was 3500, which is only what it cost is to make, but not much at all

[@abdullahz4804]

@@StavTech I understand i thought you would have some clue atleast but i guess it just disappeared, maybe got sent to another country for part out 😞 that is cheap! I mean the price you bought it for was a steal!! Thats my dreamcar and you got it for only 900!! and my E230 cost 800... its crazy 😢 yeah i guess you wasnt looking for profit just to sell what u had in it. Good luck on your other projects tho! That CLK430 turbo is interesting also.

[@subconscious13]

How would one of these go and a Honda B18C?

[@StavTech]

I like Honda B series, great engines. Most people seem to have forgot about them lately now K series is everywhere, but B is great. Not sure there’s much advantage of putting a stock B18 in over the much easier job of just fitting the 2zz though. When modified/boosted though, defo

[@hshonda2368]

Funny u should put this up i was reading your write up last night on your website at the holset he22 was thinking aboit mating the holset with a d16z6.

[@StavTech]

Depending what you was revving the D16 to and what power you was after I’d be inclined to go a bit bigger than a 221

[@hshonda2368]

@Stav-Tech yes thats the decision i came to currently on a chinese t3 which is going ok for now (surprisingly) lol. Car dreams and experiments never finish lol a million things to sort out before upgrading the turbo. What would u put on a d16z6 revving to 7200 rpm for 300ish bhp with quick spool. (Honda Logo GA3 stock head)

[@hshonda2368]

Also cool video heard a lot about these turbos recently lets c what they do 🚗🚗💨💨

[@AH83594]

Any update?

[@khamid1]

You are not getting over 500bhp from a G25-550, they simply do not flow that much. Garrett have been lying since their Section 11 a few years ago. Honeywell are no longer affiliated and their products are not what they used to be back in the GT days when Honeywell engineers were the minds responsible. They expose themselves in their own compressor maps.

[@TurbskiesTires-vn6yy]

Great

[@midgrave]

"Run out of turbine" makes little sense

[@StavTech]

No it doesn’t. What goes in has to come out and most people’s biggest mistake is they have all the compressor and no turbine flow.

[@zebarias]

Honey Badger! kzbin.info/www/bejne/aqOaqHuDnJqMoMk

[@gabegalera]

Should I go with g25-660 .61 ar? For mr2 3sgte want to hit full boost at 4k at 18psi but have some room uptop bast 6k