Are Compound Turbos For Towing or Racing?

[@StavTech]

Better compound turbo info in this single video than I’ve read or seen everywhere else put together, by far. Awesome work guys. Now I need a compound setup in my life more than ever lol

[@pddofficial]

Yes you do!

[@doomsdaydiesel]

That's because everyone wants to keep the knowledge a secret. I had to buy technical books to read and learn about it. My argument for the point made at 20:13 for similar sized turbo's is for engines that have low boost capacity. If you want the best of both worlds with supercharger-spool but also max RPM (5200 RPM) flow, all while only capping out at 30psi MAX, your turbo's are going to be pretty close in relative size.

[@Two-twelve-valves]

I love my compound turbos I won from you guys they scream a little to loud and I blew the old torque converter time for your 850hp kit thank you so very much love you and all your staff

[@pddofficial]

Heck yeah! Love that those turbos are working so well for you!

[@doomsdaydiesel]

I love how you talk about the "free power" from porting a wastegate. People told me I was stupid for doing this. And yet, the numbers don't lie.

[@pddofficial]

Something about freeing up exhaust flow!

[@Spencersmithfilm]

These videos are really great you guys. I love watching The Murr put his science hat on. Keep pumping these factoid pods out please. Good stuff.

[@slowaf_12v]

Great Podcast Guys! Love the Info!!!

[@pddofficial]

Thanks for listening!

[@simonmaheux1640]

I love your new podcast! a lot of good information there I'm from Québec Canada just continu guys that's the kind of podcast I was waiting for a long time!!

[@pddofficial]

Awesome! Thank you!

[@dbfabworks5320]

Awesome stuff!!! Best podcast out there for diesel enthusiasts. I love turbos!!!!

[@pddofficial]

Thanks for the props!

[@JPMotorhead1993]

This was entertaining and very informative! Keep em coming guys!

[@pddofficial]

Thanks! Will do!

[@Woodywater]

Compounds are awesome, especially when you add EFI live to it. Done the coolant bypass head studs motors got 230,000 on it. It pulls hard. I did get my compound kit from power driven diesel. I went with a little bigger turbo on the manifold.

[@coalstang]

love this vid! smart dudes talking about real world experience. 👍👌thank you.

[@pddofficial]

Glad you enjoyed it!

[@kd5inm]

Came here from Project Farm. Thanks for helping him out.

[@hallasnackbar1865]

I am currently running a s361/.83ar with a s476/1.15ar (no gates) and 30% overs. Builds boost as low as 1400 rpm all the way up to redline and i cant get egt's over 1100. Amazing for towing and daily driving. I did stretch the arp2000's on the first rip with that set up. 625's are holding just fine at 650hp.

[@pddofficial]

Sounds like you've got a great setup!

[@ppump24valve53]

That’s exactly what setup I have, stage 4 200hp Flux injectors. I absolutely love my setup! And right at that 650 hp mark. And yes, 625s are the ticket!

[@joesalazar770]

Oh still on stock injectors or from Mopar 135k miles on the truck it's towed heavy since I've had it usually over 25k unless empty. Any info to help out if love thanks guys

[@joec9680]

It would be great if you could use a white board and show some examples drawn out vs your actual trucks. Basically I’d like to know what is the theoretically best intercooler stack setup vs reality of fitting it in a truck and what you can get away with. Thank you for sharing your knowledge.

[@garyguyette9739]

Hell yeah boys! Keep it coming!

[@pddofficial]

Glad you liked it!

[@460EFI]

The easiest way to explain compound turbos is "turbocharging the turbocharger." It makes sense as a stand-alone statement, but the more you think about it, the more sense it makes.

[@pddofficial]

Very true!

[@dhillanroy6659]

Love the podcast, can you guys do an episode on VE pumps?

[@scottbaldwin2291]

I have a 93 ve with scheid pump 12mm. S363/68/.70 over S475 running pdd 5x12 nozzles and it does good, smokes alot. I have seen 60 psi boost on a long run but I think the pilot injection nozzles with 5x14 would run better. Hope they comment about us old school VE guys

[@fredjones554]

23:19 I think the cooling effect is a result of running the primary at a lower pressure ratio / more efficiently (less heating of charge air) compared with a single turbo.

[@oldiron3735]

Super informative guys, I appreciate it!

[@pddofficial]

Glad you enjoyed it!

[@oldiron3735]

@pddofficial I drive a 5th gen 6.7 that is stock except for all the damaging and unneccessary nonsence. Although you guys focus primarily on the 5.9s, the info is still very relavent to the 6.7 guys like me. Absolutely love the info and the developments you come out with. Please continue to share all your turbo and diesel information.

[@jedpratte]

Good video. One of my fav compound set ups I tried was a 63/68/14 on the manifold over a 83/96/1.32. Used on a 5.9 CR external gate on manifold. 150% overs and 10mm pump. Later went to 200% and 12mm, ported head, cam. Would make just a hair over 1k whp and still pull a trailer.

[@pddofficial]

It really is ridiculous how much power you can make with compounds and still have a usable truck

[@jedpratte]

@@pddofficial 100"% Played with changing the manifold charger a few times but that combination i liked best. Sacrificed some total power for the great spool and street manners kinda thing. This was 6-7 years ago and guys said this combo would not work.. To many spewing bad info. You guys are on the money! I was surprised it was not mentioned when using a manifold charger with a internal gate set as the turbo manufacturer shipped it. I would most would dump all the drive off the manifold charger and barely be compounding on a ton of set ups.The boost/ primary boost/ drive math would show it. Then i would set it correctly and truck gains 20-30 on boost and keep compounding and the owners would be amazed after.

[@bernhard8540]

Amazing as always 💙 we love the podcasts💙 are you guys gonna talk about the new 6.7 cummins?😊💙💙💙 I haven't seen much besides Josh's video but it might be a good subject 😊

[@witcher71]

If you're not living the Compound turbo life, you're not living! I've got a side by side setup with the manifold turbo mounted backwards so the hot pipe is short like am over-under.

[@pddofficial]

I love mounting the manifold turn backwards! Keep that heat fit the big turbo!

[@grantensrud9185]

Currently putting together a new LBZ. Adding an S-483 over a great but no longer available Danielle 3794. Short block is a pretty stock with keyed crank, fluid damper, and Comps stg2 cam. Heads are stock with beehive spring to match the cam. Bolt ons besides turbos and piping are PPE manifolds and up pipes, PPE duel feuler stock pumps, 2020 L5P oil cooler, and a Banks CAC. Injectors tbd. Due to stock bottom end tuning will be modest 750/800hp...

[@pddofficial]

Sounds like a monster build. What are you planning to use for injectors?

[@misterapocalypse1]

As someone who exists, this is an excellent topic! Great info and ideas. Maybe one day I'll translate it to my 3L diesel for compounds :)

[@mechanic_prepper]

Enjoying these podcasts guys. Y'all do a good job and voice your opinions on so many ways to skin a cat and make power. I'm building a 94 12v and a 2001 vp44 truck. Both personal rigs both 330k plus miles. So far the 12v has been way cheaper to make power but that's expected . Have a s475 to put over stock just need to build kit. Bought the 2001 so I could take 12v out to refresh and reseal with head studs and dynamite injectors from Lenny. ( He's local). Probably gonna try your AFC live since I work this truck hard and nice to do minor fuel changes without popping hood. I have built both trans so I'm ok to around 700 or 800...not that I want that much but like overkill for towing. I just got trans in 24v and my what an anemic turd..lol. Eventually gonna p7100 that one but want to play with the VP and compounds... Any advice or suggestions on tuning software.. I have hptuners and efi live but have never done vp44 truck tuning wise. Fun fact..both trucks run on black fuel. They both love it. Vp44 has a fass on it which is awesome for adjusting fuel viscosity with a cold snap. High return system mixes very fast.

[@pddofficial]

We have had good experiences with the Adrenaline from Quadzilla for tuning VPs. Call in sometime and we can go over some options! 435-962-9555

[@bcbloc02]

I use low pressure and high pressure turbos for identification. For towing compounds really are better.

[@pddofficial]

We agree, compounds are excellent for towing!

[@coldiceEVO]

16:55 For intercooling after the high pressure stage, what type of intercooler was used? Water-Air or Air-Air? Does high pressure puts strength requirements?

[@pddofficial]

That was a Bell water to air unit designed for 200 psi.

[@ronswag122]

Thank you for all the information and pod casts, been thinking about doing compounds for towing, looked at the kits at PDD and all the compound turbo kits say towing up to 10K pounds, and i tow between 10k and 15k pounds not looking to smoking tires off, drag, and racing .

[@pddofficial]

We would love to discuss all your options, give us a call at [phone]

[@Ranch-kvb]

Pure enjoy Thanks a lot 🎉❤

[@peterdecasas3655]

Love it!

[@a6t8vw1]

I had a over under setup on my 06, s363/s475 both turbos had the smaller turbines for the frame. It made 65 psi on stock injectors/fuel system with a smarty jr 100hp tune. cool egts. Later i did 10mm cp3, 50% injectors , EFI, cam, etc and just the s363 on a 3rd gen manifold. made 40 psi, it felt twice as fast lol. i didnt go back to compounds due to complexity and harder to work on and needed "stock" appearance but i sure missed the compounds fow low egt's while towing and how quiet the exhaust was. I miss that truck, now i have a boring 2023.

[@pddofficial]

Yeah the amount of noise the turbos kill really is a nice part when towing with compounds!

[@Balakay9435]

Hell Yeah Brother 🇺🇸🦅

[@bigtoy302]

Excellent podcast. Do one talking about camshafts. Which ones and when/if they're needed. Not much info out there.

[@pddofficial]

Excellent idea!

[@Upliftyourbrothers]

Great info. Does your kit use a 2g manifold for the 2005 5.9 or retain the 3g stock manifold?

[@pddofficial]

It is the 3rd Gen manifold

[@alanbagel2204]

Super helpful 👌

[@Weber023]

6Ls love blowing headgaskets so im going to do my best to keep drive pressure a little lower so I over sized my manifold 76/87 1.0 still spolls and drives decent but plan on adding a 96 on top of it

[@pddofficial]

Did you o-ring the heads?

[@jimmysturdevant9843]

I got a really good one. I have a built 6.4 Ford did myself right now it has the factory compound style setup with drop in compounds from Pure Turbos 59/73 my goal is to slap a s488 after them and feed 488 into the stock compounds. I have all supporting mods and whatnot. Am going to add interstage intercooling. I can manipulate drive pressure via VGT in the factory style turbos. Should I go bigger? Truck currently makes about 800hp 1650ft lbs at 1800rpm

[@jimmysturdevant9843]

And currently makes about 70psi intake temp is always same as ambient.

[@pddofficial]

I’ve always thought it would be cool to do a triple stage compound set up on a 6.4! If you already have enough air fit 800 hp i would go bigger than a 488. I would look at a gt55 variant. We have a ball bearing 98mm turbo coming soon. It’s on my mega cab right now and it rips!

[@Engine_biulds]

Im looking at doing a compound setup with a billet extended tip 60mm he351cw with a custom higher flowing lighter weight 67/76 turbine. Utilizing a 1400rpm stall converter and i need it to spool quick, so ill be looking at a 12cm devided gated housing, and a 2gen water cooled qsv (quick spool valve) I may not need it but my goal is to flow as much as i can through the small turbo's turbine, that's huge i think.

[@pddofficial]

Sounds fun! Let us know how it works. The 76x67 turbine in a 9cm housing is tough to beat though..

[@pault4513]

I remember back in about 1975 at mack trucks engineering lab we were twin turbo charging a cummins kt 450 for possible production sales Trucks are so much more advanced than cars Like 1974 trucks had ABS brakes that owner would take off right away

[@Sander-bx9lh]

Do you ever have to upgrade crankshafts, small end, big end ?

[@pddofficial]

Not really. The oem cranks are pretty amazing.

[@ericUnger-id5mf]

Could you guys talk about running an air to water intercooler on a 12 valve. I see new ones for a 6.7 power stroke for $120 on rock auto.

[@witcher71]

Hard to believe that little element can keep temps at bay on a 6.7 towing up a long grade.

[@kx519]

Water to Air is easy. Just mount a massive heat exchanger up front and use the heater circuit. Heater core>heat exchanger>w2a I have kept intake temps in the 150* range with compounds that way with a tiny straight thru core from frozenboost.

[@IanYav5.9]

Hope to run compounds one day, but for now just using nitrous to spool a big single because race truck.

[@pddofficial]

It’s a proven formula!

[@CGAgaming-4430]

So can you talk about sled pulling? Single turbo but gearing ratio and auto or manual? Interesting topics here

[@pddofficial]

Honestly we are not the experts on pulling. It is super fun but not a lot of it around here.

[@TxHammer757]

What about keeping the turbos at full speed all the time and use a E gate to control the boost, no lag automatic boost and the E gate controls the actual boost?????

[@nickc7320]

It seems like keeping the turbo working all the time would be overly complicated because that would probably mean a second method of spinning the turbo outside of engine exhaust. Adding extra systems to the engine increases risk of failure.

[@MrAZHooligan]

Whatever happened to that series on the 6.0 compound kit?

[@00motoman]

There was a comment in this about running triple 480s, and thats for bigger more efficient power. So what about running tripple stockers, 35 or 351 in a triple set up? Would that be as good as a 351 s400 set up?

[@pddofficial]

Yes it could totally work. It’s just a lot of fab work when you could easily make the power with 1 larger low pressure turbo… but there may be some gains with the 2 turbines. I think it would be a fun set to drive personally.

[@grantensrud9185]

About waste gates. Is there an advantage to a gate before the turbo in the valley that dumps its wasted exhaust back in before the atmospheric turbo?

[@pddofficial]

Yes people do it all the time. It will allow you to tune which turbo does how much work.

[@grantensrud9185]

I'm not sure yet. This motor is just a to have something in the truck now. I am also building one that is going to take some time to finance. That one has a new LML block with SoCal billet caps and girdle, Callies crank, and Carrillo rods. Turbos and bolt on will be moved to that when finished. That one will get 100% overs. I think this current motor really shouldn't have more than 60%s but don't really want to buy twice 🤔. Just one bad decision after another 😆 🤣 😂 My wife bought me a shirt that says SMELLS LIKE RACE GAS AND BAD DECISIONS. 😁 she is very tolerant...

[@joesalazar770]

Been awhile since ive bought just eith two transmission breakdowns and a tractor breakdown plus the loss of income i just beern broke. Hoping ill pull out this year and make it up there to see you guys. Still have not got the mm3operating on the 04 24 valve thats my tow rigg 48 re i did the biuld myself second time around now its great i tow hay gross about 35 40k and it handles it well at stock power. Uses third gear to pull east bound 70 from east of limon. After limon i can run 80 if i wanted the egts on a hot day i have to back out but i always try to keep it under 1300 ive had it to 1350 not confortable there so i bavk off and cool it down trans stays under 185 most of the time again like it under 200 all the time i did have to pull the 35" tires off to pull this trailer just to much gearing. No point in overworking it for towing

[@pddofficial]

Good call on the tires. Big tires only beat up everything. They do look sweet though!

[@222foxracer]

Thoughts on compressor wheel blade count for the high pressure turbo? 11 blade count vs the 7+7 6+6 5+5. Also what about the atmospheric charger comp wheel? What make more peak and what makes better daily driver towing power (more efficient)

[@SCOTTDIESELCRAZY]

What about the smaller stuff like pd130 1.9tdi Vw and the Mercedes om606 for compound setup what your advice

[@yonilavi7707]

You guys are building my motor from stage 1 or 2 cylinder head to 6.7 crank with towing happening once a month or so and still uncertain in turbo selection

[@pddofficial]

Call in we can figure it out!

[@rowdykrowd435]

Let's hear your opinions on wastegate routing setups, and boost controllers.

[@PlaneSaddles]

305HP 5.9 6spd just for towing and a wider power band, staying in the 400hp range: Which would be worthwhile? Compounds (say the stock HE 341 for the small) and a Pacbrake, or a VGT kit like BD's Howler?

[@pddofficial]

Vgt turbos in compounds are awesome. The actuator that comes on the dodge turbos is another story.

[@davidwells2848]

Problems running a kcstage3 turbo in the valley and an s480 T6 out front?

[@gianniboomhower]

@1:00 I was into jdm rice burners till my balls dropped. Turbo diesels are where it’s at, get work done and hear the stututu😂

[@Speedy2222]

My biggest question when switching to compounds is really on tuning. If i get a tune for 400hp( i have a 1.9 VW) for one big turbo can i reconfigure my setup by just adding a smaller stock sized turbo hoe bad is that going to affect my tune? It sounds like wastegate timing is what is really affective.What if your tune is already setup for your current power level what would your tuner need to change?

[@pddofficial]

It sounds like your putting in a small turbo with your current large turbo. If that’s right it your rpm range will drop. Everything will happen earlier. Torque will increase dramatically. If you are worried about breaking stuff your tuner should limit low rpm fueling.

[@woodyfregia6653]

Why don’t you guys do more parts for Cummins swaps?

[@BenjaminDempsey-p1r]

What would be a good compound set up for a 850-900 hp 12v daily driver / tow rig with 35s and what gear ratio would you guys go too?

[@pddofficial]

I like the 3.54’s at that power level. With that size tire you might like a 3.73 . For turbo’s i would utilize our 62mm he351 and our aggressor 480. That’s what Will’s junker has at 980-ish hp and it works so good!

[@davidbosch3779]

What’s Todd’s gt55 compressor size? Love these pod casts keep them up 👌

[@pddofficial]

98mm

[@qwertbumbi]

I understand that a high-pressure turbocharger functions as a pressure multiplier. My question is: how does the turbocharger's rotational speed change with an increase in the intake pressure? How does this affect the compressor map?

[@pddofficial]

Rotational speed or rotor speed decreases with increasing inlet/intake pressure. The compressor map changes would need to be documented on a multi-million dollar gas test stand, but in general on-vehicle testing, the turbo seems to track closely with the original map, but usually doesn't have enough turbine energy to reach the extreme choke or right hand portion of the map without nitrous injection to create extreme exhaust energy.

[@qwertbumbi]

@@pddofficial If I understand and interpret the answer correctly, a high-pressure turbocharger's flow capacity cannot be extended by increasing the intake pressure, only its maximum pressure can be increased. So, for example, with a GARRETT G25-550 (5.5 bar absolute pressure) = 4.5 bar boost, is it not possible to achieve 57 lb/min airflow if the intake pressure is 1.5-2 bar absolute?

[@matty8272]

What about two smaller turbos in parallel like the new 3L hurricane? Would it be worth the effort on a sub 500hp truck

[@pddofficial]

There is some thought and math to back up 2 smaller turbos spooling up quicker than a single that moves the same amount of air. I have never done that but i doubt the custom fab work would be worth the small gains.

[@richardpeoples2887]

Why dont we see intercooling between the 1st and 2nd stages of compression?

[@witcher71]

It takes a lot of room and a lot more parts. Now you need to figure where you are mounting the W2A heat exchanger but if you do add an interstage cooler, you will see more power.

[@JORSOCR]

Room usually

[@pddofficial]

We have done it on radical race applications, but there is quite a bit of complication/cost adding intercooling in addition to aftercooling. The performance benefit is well worth the hassle in a max effort application.

[@WhyNot6243]

Most of the speed limits in Canada are 100-110kmh (60-65mph). That puts me at 1,700-1,750rpm in OD on my 06 5.9 with 48RE. I have been thinking about doing a “micro” compound kit with a 50-52mm manifold charger gated into a 472-476 atmospheric charger. Have you guys done any kind of testing on kits this small? Goal would be maximum fuel economy vs power.

[@pddofficial]

If your goal is fuel economy, we'd recommend you stay with the HE351CW turbo size but get the Aggressor 60/67 to reduce backpressure at cruising speed. Your factory setup is designed to promote in-cylinder EGR so anything that reduces exhaust backpressure is best on your model year. Small compounds are fun and snappy, but not the best for fuel economy on a commonrail fuel injection system.

[@redneckbetzkowski5968]

I have a 2006 cummins 5.9 with 2g manifold and he351 67/67 which turbo should I add to make a compound around 900hp do I use 100%over injectors and cp3 12mm? Your videos help a lot, thank you!

[@pddofficial]

Call us at the shop and we can talk you through a few different options! [phone]

[@TxHammer757]

What are your thoughts about the triple turbo setup for the 5.9 cummins? Claim no turbo lag

[@pddofficial]

The claim is false, everything has lag, in general bigger turbos always have more lag. Two smaller turbos in place of a larger turbo do have less lag than one large turbo, but the hassle of 3 is not worth the small gain (in our opinion) meaning the only real place for triples is setups so large a traditional compound setup is not big enough.

[@Truckshack2005]

2005 5.9 Cummins, I have a Silver bullet S366/73/14 T3 looking to add a S480/96/1.15 T6 or 480/96/1.32 T6. Injector size? I do not tow. Have built bottom end.

[@CGAgaming-4430]

Or do a vid on sled pulling 101

[@jeepsnthings565]

Love these turbo talks but cant relate to much since me truck is a 2014. Towing with A/C on in over 100° up grades in california over 35 psi sustained and no over heating.

[@brentmcmahon8188]

Have you guys ever tried two turbos with 3 cylinders into one turn then the other 3 cylinders into the other turbo just like Dodge’s new straight 6 Hurricane engine and feed those 2 turbos into one big turbo so put what you think about just and no big turbo and the with a big turbo ?

[@pddofficial]

I have never tried it but there is no reason it wouldn’t work well with properly sized turbos.

[@joesalazar770]

O have a funb qeustion if density is really the thing were all after which it is cold air 0acks better why not use a cooling system to cool charhe air as well as manufold air. And i will not post on here we can talk in person. Hoping yo get a couple hotshot load to ut in the next year see you then guys ill check before i come seeyou all great work guys

[@pddofficial]

Density is both heat and pressure. Easier to add more pressure then to add complex systems beyond intercooling

[@freddyleos]

does tire size effect HP/torque in this conversation in regards to towing.

[@pddofficial]

Tire size effects your gear ratio and wind resistance somewhat, so bigger tires will put a little more load on the engine all else being equal. With a turbo diesel, there isn't a huge towing difference going from stock 32" tire to a 33" or 34". Once you get to 35", the taller tire is noticeably slower off the line at a stop light, and the fuel mileage suffers from the wind resistance, but still not a huge difference at highway cruising speed so long as you cruise at the same actual speed meaning get the speedo recalibrated. 37" tires with factory gearing is quite noticeable and drops cruising RPM enough to make you really wish you had compound turbos!!!

[@baconcreek609]

Myer's dad's pickup is a ripper.

[@Hitman-ds1ei]

Not as convinced as I was after doing so many single turbo conversions on CAT ACERT C15s etc and if twin was truly better I cannot see this being an advantage but maybe it's due to load duty cycle percentage being higher on hyway trucks

[@mechanic_prepper]

The acert was made for emissions .. people delete IVva and single them and feel stronger. They also change fueling...now an acert with better compound set up and IVva delete will have much broader torque curve and run away from a single up the passes. And leak less oil..lol. I like them both.. c15 tends to develope less oil leaks and block is a bit stronger if you are making hotrod truck...have a few triple drives out there 800hp and up...but that's a owner driver rig that will watch pyro and keep from melting them down. Compounds help alot.

[@pddofficial]

Excellent info! Thanks!

[@ETal-f4v]

Any evidence of exhaust brakes damaging a turbo/compound turbo system?

[@pddofficial]

Not that i have ever seen.

[@TxHammer757]

Aurora 3000/5000 as a compound set for a 5.9 for 600 horse and 1100 ft. lbs daily driver????

[@jlaustill]

It's pretty bad form to ask people about their competitors products 😂

[@TheProchargedmopar]

👍💪

[@s550life4]

Need to do a video on injectors way to much controversy not to male a video on it

[@pddofficial]

Great idea!

[@spencerbrown1112]

They're not twins. Not even close.

[@cotrevor1]

So I hear you guys talking about numbers and sizes on turbos, wastegates, etc.why dont we ever hear you ever talk about elevations where people live because someone setting up a compound and buying turbos in Florida is going to be a totally different set up to someone in Breckenridge Colorado or jackson hole wyoming ect.you give all these folks false hopes when they live in high elevation places just keeping it real....

[@shadow105720]

Turbos make up for elevation until the turbo is maxed out. And usually the turbo is not the limiting factor, the motor is.

[@cotrevor1]

It doesn't matter what turbos you put on; without oxygen, they can't run. The numbers these guys talk about are unreachable at 9000 feet of elevation. All I'm saying is they should talk about how crucial oxygen and elevation are for people to reach those numbers. I see young guys in Steamboat Springs, Colorado, spend thousands of dollars trying to have a fast truck that's dependable, and no one has ever explained to them what elevation and the lack of oxygen do to vehicle performance.

[@kx519]

They are at 6000ft or something stupid. It isn't like they are in south texas at 400ft.

[@shadow105720]

@cotrevor1 turbos were literally invented to make up for the elevations of flying planes at 10s of thousands of feet in the air. You might have to account for the efficiency of a turbo but they aren't in 0 bar of air. 0.5 bar is between 15 and 20 thousand feet. That's the top of the tallest mountains in America where I doubt there are many roads and definitely not any drag strips. Are you competing in the pikes peak hill climb in your daily driver diesel truck?

[@witcher71]

Florida air is not that great with the humidity. I think average DA is in the 2500 elevation range on a warm day.

[@JustinSchooler-f2j]

These videos are badass!! Lol

[@rocklanddale8646]

TWINS DONT FEED EACH OTHER ONE FEEDS EVEN CYLS AND ONE FEEDS ODD CYLS. ME TINKS

[@pddofficial]

Generally true twins get fed by each bank, and then the air combines together into the intake manifold and goes through which ever cylinder it gets sucked in to, odd or even. In this podcast we're talking about compounds which do feed eachever, their also refered to as sequential turbocharging.

[@pault4513]

I remember back in about 1975 at mack trucks engineering lab we were twin turbo charging a cummins kt 450 for possible production sales Trucks are so much more advanced than cars Like 1974 trucks had ABS brakes that owner would take off right away