MK4 1.8T with GTX3071 Gen 2 with Water/Meth on the Dyno

We see what kind of power we can get out of a GTX3071 Gen2 on this MK4 1.8t. We also do a bit of a comparison between the Precision 6262 power band VS the GTX3071 Gen 2. The key to this is we're only running 91oct with an AEM Water/Meth setup. Our fuel is junk here so we're limited in what we can get away with even with the W/M. With better fuel or multiple nozzles we could easily see pushing it further, but we reached our goals.
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Engine Build
AEM Water/Meth Kit
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Garrett GTX3071 Gen 2 (Contact for best pricing)
Eurodyne Maestro 7 Tuning Suite
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IE Drop in Rods
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ARP 10mm Head Studs
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Supertech Exhaust Valves
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Supertech 1.8T Valve Spring/Titanium Retainer Set
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ARP Crank Sprocket Bolt
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CTS 1.8t Turbo Kit (with Precision 6262 .63
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CTS Front Mount Intercooler Kit
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1000cc Injectors
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Deatchwerks in-tank fuel pump
Vibrant Vented Catch Can
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Fluidampr
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ClutchMaster FX400
Innovate Boost Controller/AF Gauge
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[@BkSMedia]

Been watching this channel for a few weeks to gain some info on tuning 1.8t's. There's not a lot tuning content out there that's UK based so appreciate you guys going through the builds, etc.

[@COMotorsports]

Glad you like. Be sure to share where you see fit. 👍

[@rj.reliable]

👍

[@NyksWyldMynd]

Love watching you work through issues and dialing it in!

[@COMotorsports]

Thanks. 👍

[@charlesshamseldin9555]

Car sounds amazing. Nice work

[@rickm.10]

Boys, awesome work on the Jetta! It's interesting to see each turbo's characteristics side by side on paper (so to speak), and on real life

[@COMotorsports]

We thought so too, much appreciated.

[@powdere4donuts]

This is the 2nd video I've seen of yours and i have to say I'm hooked. Love the content on this channel

[@COMotorsports]

Well thanks for the comments and enjoy all the rest. 😉

[@TruEGTI]

So sick guys!!! Don't stop guys. Being a VW guy almost 30 yrs one thing we need is a great shop doing videos. Keep it up!

[@COMotorsports]

Much appreciated. We're trying.

[@veedubbergti]

Great work guys.

[@COMotorsports]

Thanks

[@adamquick1116]

Car sounds good. I'm suprised of how much it gained with the new turbo and map logging!! Cant wait to see more.

[@COMotorsports]

We've made 700whp on this same 6262 on a 1.8t. However different fuel, different cams and a bunch more boost. It just wasn't the right turbo for this specific car. This is way more suited for it's intended use.

[@alexadames9390]

Awesome video, very informative. Thanks for sharing.

[@COMotorsports]

Glad you like.

[@roystonhughes3278]

Amazing contence on 1.8t builds very explained well for all novice people who don't have any idea of what to do.

[@COMotorsports]

Appreciate the comments.

[@psavel274]

Nice work! That 3071 really spools. Almost 100whp/ trq in the midrange is going to be super noticeable especially for street duty. It will totally feel like a whole different car. It sounds damn good too. Love the popping on decel. Seems to rev for days as well. 👍

[@COMotorsports]

Thanks, yeah nice setup for sure

[@migsov3]

You don't find a good vw/audi channel.. love the content keep it up. I have a 2001 vw Jetta wolfsburg..

[@COMotorsports]

Much appreciated, be sure to share if you can. We're trying.

[@jacobg7637]

Love this car

[@gasperjug7464]

"We're cooking channel" lol gotta love this guy😂

[@COMotorsports]

Maybe YT's algorithm will send new viewers. lol They will be sadly disappointed.

[@collinw9381]

id love to see you guys actually drive some of the cars you've been testing

[@OGHAuto]

Awesome, this really helps my VW ghia drag build. Trying to figure out what turbo will be best for this block.

[@COMotorsports]

Drag car...you want big.

[@JiggaOfficial]

Wow I’m lucky just found the channel on my recommended then watched the last vid check the channel and this one just dropped ! #JettaGang

[@COMotorsports]

Glad you found us. 👍

[@connorwolszczenski9124]

Yay flames

[@Sanch3Zzz]

My mk4 Golf GTI with k04 and support mods, was straight piped with 2 blast pipes.... And a 200 cell cat .... Was the loudest things I've ever heard, wounded like a tractor/Nissan patrol 🤣

[@JiggaOfficial]

Great work ! Men and geee adds galore money got to mek !

[@COMotorsports]

Understood the first part. You lost me after that.

[@JiggaOfficial]

@@COMotorsports loool it is Bajan patois (Caribbean language ) for “wow lots of adds money is being made “ I’m watching from Barbados 🇧🇧

[@COMotorsports]

@@JiggaOfficial Ahh.... sorry we let YT place the adds and sometimes it gets out of control based on the length of video.

[@JiggaOfficial]

@@COMotorsports no man more ads more money ! 😂 I’m not knocking it , hope to see some street pulls for this Jetta

[@haroldhaynesiii]

I coded out ASR on my 02 Jetta

[@jedediahsmart569]

For the fuel, I think that's good power. For reference I made 483 AWHP at 29psi on the same turbo running 93 with e20 on my MK6R.

[@COMotorsports]

Yeah the 2.0t has more displacement behind it, and a better flowing head. So completely makes sense.

[@jedediahsmart569]

Totally, I think that’s a great number for a 1.8t, plus I have big valves, and e20 makes a huge difference for timing capabilities. I’ve seen a lot of Japanese cars make high 300’s in that turbo, so again, that’s a great number.

[@hawaiianpunch20v]

Can’t beat having pump E85 everywhere 😎

[@COMotorsports]

Not everywhere.

[@hawaiianpunch20v]

Everywhere by me*

[@onlyrealones]

I love the content and info that you share on your channel, keep up the great work! Does this Jetta still have stock cams?

[@COMotorsports]

Much appreciated. Pretty much all upgrades are in the description. So yes stock cams, stock intake manifold, stock throttle body... just valve springs and exhaust valves in the head.

[@rotaryrocket74]

What A/R turbine housing is being used in the 3071?

[@neildantino4709]

OK you guys absolutely nailed it with the way you formatted this video(IMO). With the intro giving a quick description what the big components to the motor are, narrating your changes with the boost/timing/etc. throughout, Clayton flashing to the Dyno screen periodically👍, & then the recap at the finish, comparing graphs. Absolute home run(again IMO). Not to mention this car is absolutely immaculate, super clean! How this video could have 1400+ views and not have equal amount of likes...🤨🤔. Few quick questions: 1) what in your opinion can this specific build handle for boost and what would be the potential failure? Head gasket? 2) how are you peddling the car, roll-on or is it mashed to the floor and you’re seeing how it actually builds up boost/rpm? 3) What media are you using for the oil return on the turbo? I’m trying to keep mine flexible somewhat and pass thru my FullRace exhaust manifold rather than using a hard line and trying to mate it to the oil pan. I know there’s several different ways, just curious. One last thing, any LSD in the gearbox or special done? thanks and again absolutely spot on with this!

[@dustysteele5408]

“Toot it n boot it”😂

[@rkstuntz5278]

What can i expect out of a efr7163 twinscroll t4 on a 1.8t on 10/11psi boost? Is it similair to this gtx3071? Around 240/250whp? Im from europe, i think the gas here is like the same as 93 or somthing on youre place, they give it other numbers i gues

[@dominicandawg3455]

Could you do a vid on tuning the 3.2 fsi v6 from the a4/a5

[@audiocreations5194]

Great video man , hey just a curiosity what Size of cts Intercooler you running the 450 hp or the bigger one

[@COMotorsports]

Big boy on this one. Works damn good too.

[@bitcozy5327]

Love the content guys! What FPR are you running?

[@COMotorsports]

Thanks. Stock

[@1.8_hoopt]

I’m going to be doing exhaust valves on my AEB head soon. I saw you mentioned you lapped them. Is this needed anytime you install new valves?

[@kensitchon634]

Yes. Lapping valves is basically getting the valve to marry the seat so it seals really well.

[@paulrich9198]

What kind of power do you think you’d be able to make with a GTX3076R Gen 2 with the .61 a/r? 500whp max?

[@COMotorsports]

Depends on fuel. But yes 500whp us possible. I made 500whp at 29psi on my 16v on the gen1.

[@luispadilla1675]

It is critical to size a turbo correctly to your engine and transmission, I went from GTX 3076 to a G30-900 AR64 it makes more power but now I am slower since I am out of boost every gear ) =

[@COMotorsports]

Most definitely, which is why I never answer the question "what turbo should I get" on the internet. It all comes down to what the car is being used for, HP goals, and long term goals. Your options now are smaller turbine housing (if there is a smaller one then you have), more RPM so it doesn't matter, or more compression.

[@dennisrobinson8008]

Good discussion

[@RPchris]

sounds like the door control module is messed up, sounds like thats what the cars beeping for

[@COMotorsports]

It's cause it's on dyno without a seatbelt and the ABS geeks out while on there.

[@dubdubberson]

You guys need Walker electronic ear protection.

[@COMotorsports]

@@dubdubberson we'll take em'

[@tannerhamilton6096]

Do you guys stock Eurodyne? I’m looking to buy maestro 7 in the next couple weeks from your website. What’s the wait time on one normally. I’m from Ontario.

[@COMotorsports]

You'd generally have in a few days. ;)

[@new2boost596]

have you had any cars come in with a G25-660 or G25-550 on it? id like to know how those are on a 1.8t im going to buy one of them. but i cant decide lol. im leaning to the 660 just because ive read that the 550 starts to choke out are 6500 or so

[@COMotorsports]

Have not sorry. However I think both would be a great option.

[@nathanmacleod331]

Unless the n/a car is a 12v vr6 🥰

[@COMotorsports]

No... street car... ZERO exhaust not gonna sound good for daily use.

[@reallife4598]

You loss low end power and when you do have power you never use In Normal driving so a wast coming from a vr owner sound beast though

[@Brandon-ff9gi]

Where are you running your meth nozzle? And what kit/size nozzle? I have the exact set up but with 93 octane and a aftermarket intake manifold and I’m working on getting the meth set up soon.

[@COMotorsports]

Single nozzle, charge pipe after intercooler.

[@user-oo7ec8wr1o]

Which engine code? I own an AUQ....(just changing the rods) how much horsepower could I handle with the stock pistons? Best regards and congratulations for the work you do

[@COMotorsports]

Irrelevant, what this video. kzbin.info/www/bejne/iqG6loSsgNdnjLM

[@danbuchanan]

You guys have a friend who has experience with streaming video setups, you should ask him for help for your 10K subs live stream. Ps, it’s me. I’m the guy.

[@COMotorsports]

Lol Roger that. We'll take you up on that. Much appreciated.

[@jordancespedes15]

Which fuse do you guys tap into for the watermeth 12v ?

[@COMotorsports]

It needs a constant and switched 12v.

[@I53-624]

with an open/external waste gate can you still get turbo flutter?

[@COMotorsports]

If it's setup wrong I'm sure you can.

[@mk4gli343]

Have a question I have an gli 1.8t what to gain some hp but want to keep it reliable what u suggest

[@COMotorsports]

Reliable simply comes down to the parts you put on it. This specific car is super reliable.

[@carcaineaddicts4820]

Is the waste gate recirculated into the downpipe on this setup?

[@COMotorsports]

On this kit yes.

[@coultl6556]

What size meth nozzle did you run? Hoping to hit similar power and thinking I’ll run a 750 cc/min.

[@COMotorsports]

We generally size for the power and boost that it will run.

[@jacklarish4032]

If I were to run a gtx3071 on my mk4 gti, does anyone sell a down pipe that would be ready for installation?

[@COMotorsports]

The manifold and turbine housing will determine what the downpipe needs to be. Each turbo manifold put the turbo in a different location.

[@BobbyChubby69]

Good power I whant that on my car!Is it a .63 ar or .82ar?

[@BobbyChubby69]

Great video and information!As usel.One info is missing.You never mention the size of the turbine housing.

[@moitolopez2776]

No hablo inglés pero la verdad que ese carro me tiene enamorado tengo uno igual a el 2004 GLI y me interesa muchísimo saber que hacerle para obtener más caballos de fuerza saludos desde Chicago IL

[@ironbloodedmyth1204]

As le el downpipe, El escape 3in, intake,y que le hagan un tune a la computadora de stage 1 o 2

[@moitolopez2776]

La computadora esta echa stege2 y tiene 2step pero quiero más y en estos momentos el manifor esta dañado lo voy a comprar d la marca CTS

[@stantonshakespeare4530]

I love this car! I wish I could make it mine! Hahhaa I have a 03 jetta wolfsburg but with a O2M transmission. I'm looking to maybe get a new tune or at least be able to dial it in a bit and turn off my key IMMO and turn off all my PCV system as it's been all deleted because it was rotted. I have a maestro 7 cable would I be able to do it from there? I've been trying to learn on maestro but very little forums I've found hahaha haven't searched it recently tho

[@COMotorsports]

A lot can be done with Maestro yes.

[@stantonshakespeare4530]

@@COMotorsports do you just have register the car with maestro to be able to access it all? Or how can that be done?

[@COMotorsports]

@@stantonshakespeare4530 you need to have a cable and license the car.

[@stantonshakespeare4530]

@@COMotorsports well I've got the cable! I'll have to try and re licence it with the car! I bought the cable second hand and haven't learned much on how to use it 🤣

[@dameagerbeaver7703]

LSD or open differential in the 02M?

[@COMotorsports]

No modification to the trans.

[@Sanch3Zzz]

Stoners are gonna be stoked... I cried 🤣 cause I was puffin a blunt watching this, thinking about my next build. 420hp is a good number 🔥🤣

[@COMotorsports]

It's good you caught the joke then. lol

[@losprod.6210]

What’s your opinion on maestro software ? Before I buy it

[@COMotorsports]

If you want to have control this is one of the few solutions to do so before standalone. If you're building more of a track car or want endless functionality go standalone up front. Likely save you as bunch of money and time in the end.

[@wayneywayna]

Whats better stand alone or the tuning your currently using?

[@COMotorsports]

I would choose standalone everyday.

[@coreycrosswhite8890]

Was this car running a maf or mafless

[@COMotorsports]

Could run either. I tuned it mafless.

[@jerryfullen5043]

I’m looking to copy this set up..I’m wanting around 5oo when pushed,how can I contact you personally,I want someone to do it that they know what their doing..Obviously you guys know what your doing,please reach out to me so I can get you guys started on my NAsTY GLI!!!!

[@COMotorsports]

Our email is on our profile page on here and out website. 👍

[@marcospizana2800]

so what was the price of this build for the owner?

[@COMotorsports]

Price comes down to brand of parts, existing mods, and HP goals. Each vehicle is different.

[@abec666]

What a/r on the 3071? .82?

[@COMotorsports]

.63 on this one

[@AdamDanaEdwards]

Any idea of the power limit of the 09a tiptronic transmission? I use Eurodyne Maestro. Recently got a Mk4 GTI with the 1.8t with automatic 09a. Stage 2 flash with 3” turbo back. Local VW guys say the trans will blow up soon... oh well if true because it is fun!!! No boost lag with the automatic.

[@BigboostGli]

It won’t last that I had stage 2 apr tune and it blew about a year later your better off 5spd swapping it that’s what I did

[@COMotorsports]

Mk4 Autos are junk.... so just expect it to fail. lol

[@tuckintyre4713]

This motor running stock pistons??

[@COMotorsports]

Correct

[@stevesanchez1975]

429whp 👁👄👁

[@ianmcilstew1220]

Can anyone enlighten me to the use of water meth injection?

[@COMotorsports]

Not sure I follow.

[@jennekke]

It lowers intake temps so you can add more timing.

[@tuukke1906]

What ecu u use?

[@COMotorsports]

Stock in this one.

[@se1663]

It's definitely 'fvky'. Lol. Is that an APR Mk5 Gti on the lift?

[@COMotorsports]

It was an APR mk5 GTI. It's becoming a lot more than that now.

[@connorwolszczenski9124]

Alright bro that thing needs a straight pipe

[@COMotorsports]

This is exactly what the client wants, and it sounds great.

[@TokyoCollins]

im so polite to the public that my car has 2 mufflers :)

[@COMotorsports]

So kind you are.

[@Zach.T]

So I’m running a precision 6262 with the 39mm wastegate and same exact set up this car had before I put new springs in there that came out to 21 psi and had all the lines ran correctly to a boost controller and still did not get boost would you think it’s a wastegate problem or a turbo problem? Help would be much appreciated

[@COMotorsports]

You had 21psi with of springs in the WG?.

[@Zach.T]

@@COMotorsports yeah

[@COMotorsports]

@@Zach.T Boost control problem. With 21psi on gate.. you should be able to see 40-60psi with an EBC if you wanted.

[@Zach.T]

@@COMotorsports I also ran it just off the gate pressure no boost controller and still no boost

[@COMotorsports]

If you have 21psi springs in the gate and you have the gate plumbed directly to the source and you're not seeing any boost you have other problems. Major boost leak or turbo no spinny.

[@jeancharlesrabaux5658]

Trouve les coordonnées de mr gol boba sur qu il te viendrà en aide e te donnera toutes les astuces pour avoir un monstre mecànique et ci il t aide à construire ta vw y aura personne pour te rattraper dans ta catégorie j en suis sur

[@jeancharlesrabaux5658]

Please the golf mk3 is for sale yes ho no please seur

[@jeancharlesrabaux5658]

The possibul the compresseur is the compresseur the g60 + One big turbo is the big boss thé circuit puisque avec le compresseur pas besoins de faire monter la voiture dans les tours le compresseur sans charge et ensuite le turbo prendra le relait mais il te faut un compresseur plus balaise que celui de la g60 celui d un 6 cylindres bmw ca donneràis une bombes si seulement tu te décider à les passer en 4 roue motrice comme the golf boba is 4x4 yes direct accŕoch the bitume et bye bye amigo

[@hansa9159]

You guys say "car" soooo Canadian

[@connorwolszczenski9124]

Maf?

[@COMotorsports]

As you can probably see in some of the footage... Gonzo.

[@ButtKickersReviews]

Precision are essentially well engineered chinachargers. Absolute GARBAGE on a street car. Garrett will last 200k. You’re lucky to get 20k from a precision. Built dozens of 1.8ts, and I wouldn’t install a precision on my enemy’s car.

[@COMotorsports]

We've had the exact same experience.

[@frostcold81]

brrrraaaaaaAAAAAAAHH! Pop Pop. ShhhTututu! 🫠🥰🙌 all the noises