LOW BUCK LS TURBO TEST-BIG SINGLE VS SMALL TWINS 

L59 currently to install on Z32

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Currently have a fully forged 408 waiting to go into my Tahoe 😩

Lol I just got a 5.3 I'm putting in a buddies CTSv he got for cheap. Trying to select turbos rn

@@clutchboi4038 what's the car gonna be used for and power goals?

@james avery more money not all the money's

All the money's

One has to pay, to play..

Hero? Get help.

@@stevenp3176 What "stock turbos"? A 4.8 LS never came with ANY turbos... 🤔

Matt Happel made 1K+ WHP in a SBE gen III 6.0 Colorado in 2017

6000lb truck in my case lol

It not the HP it’s the torque. Most guys will pull timing at peak torque to help.

I CAN tell you that a 4L60 lasts about 3 weeks behind a setup like this... 😞

rip🤧

Exactly what I was thinking. As long as the early lag could be minimized it should be fine. The gt45 I would assume will always have the upper hand despite displacement. Although the displacement could aid the spool for the gt35s they are pretty big for a no lag twin set up.

@@delagto_5340 I’m running them due to space constrictions, they love to be Brake boosted prior to a launch and they love to rev to 7600 rpm. I think more boost and a high revving Ls would show the benefit of twin gt35s.

@@drs2000rr I’m trying to figure out something for my car and I think that might be the way I’m going to go. The twins can be mounted right next to the bell housing. I’m a cam only car and personally rather have something that can me tamed and wild when wanted to be. Plus I can just turn it up haha 😆

@@delagto_5340 awesome, make sure you address heat control with heat wrap and aluminum tape over every wire and hose running through the area, and you should be ok, get a good scavenge pump to pull all the oil out of the turbos, and run a low psi warning light incase the pump fails. Happy Boosting

@@drs2000rr thank you for the tips ! I’ve been searching the forums and reading up everything I need to do. Most of it is exactly what you said. If I take it on i will document it for sure. Thank you!

100% agree, if there is no space to run the twins a go single.

@@bradspeed I have a single on my car (2011 5.0 Mustang) and love it.

@@MrLightning54 I bet she rips

Same dude. Plus cheaper n easier

It depends a lot on packaging in your individual application i.e. the room to run 1 big downpipe or 2 smaller downpipes, etc.

@@nowayjose596 I’ve got plenty of room but after watching this it’s like dude look at how much more torque he was making under 3500 RPM with one single big turbo

@@nowayjose596 68' chevelles have a LOT of room under the hood. I could put 4 turbos in there hahaha

@@BronkStang I think if he kept going up in boost you'd see the lower RPM responsiveness of the single and twins start to mirror each other more closely and the twins then starting to make more power at the top end thanks in part to their lower backpressure. That's why he emphasizes the sizing of your turbo(s) for your displacement/boost level/preferred RPM range is more important than if you go single or twin.

It's probably just gonna give you a couple hundred rpm and choke the top

@bcbloc02 Or just up the boost and see how the single will perform with that excesive back pressure.

.63ar is as small as they get in a T3.

Agreed. I suspect that as boost continued to increase the lower RPM responsiveness of the single would start to mirror that of the twins and the twins would make a bit more power up top thanks in part to their lower backpressure.

Ya, I was pretty disappointed he only went to 13psi. Should have at least gone to 18. All of those turbos don't get to their happy place until 16psi. Response is over rated. A good converter can fix A LOT. I had a 2.6L motor with a 70mm on it. Just gotta drive it like a man, it did rev to 8k which helped.

that's not how an engine dyno works-that is a chassis dyno

if they are both sized for 1500 hp-then it's a toss up

it's turbo sizing

1 is not better than the other-chose for packaging or looks (turbo sizing can make twins and single otherwise identical)

your choice is not a single or twin of the same turbo, you would never pick two turbos that size unless your goal was to make twice as much power. Sized properly for the desired goal, single and twin can do the same thing

I''m familiar

Will probably never happen but would be so cool

I have compound turbo vids up

@@richardholdener1727 awesome brother. I will check them out

Agree. The twins were effectively running a bigger exhaust housing than the single - later spool and lower back-pressure.

Would do recommend the same .63 on a cam 6.0?

@@jackstoepfer1494 depends how you want them to act. Do you want more response down low, or more power and rpm up high?

@@AdamOpheim I would say low to mid range. It’s for an off road truck. I want to hear the turbines when cruising around.

@@jackstoepfer1494 Hearing them is usually a matter of exhaust. Housing size won't change that. Some turbines are just louder than others in general too. Mine weren't that loud and I just had 14" of 3" pipe on them. If you don't plan to push it much past 600-700 range , and want quickest spool possible, the .63's are fine IMO.

I run the .63 T3 housing GT35's instead of the .82 tested here. They are very responsive on a cam only (small GM hot cam, TBSS int.) gen 4 5.3. Also really nasty at 20lbs! I don't know anyone that stops at 11lbs on a turbo LS! lol.. I agree this test may have favored the twins if the boost was run up to typical higher levels. We are talking 100hp+ HP difference once setup in a car and taken to a chassis dyno. For reference my twin gt35s made 565/600 on 11 lbs on the chassis dyno. All that heat he was talking about improving response... that REALLY shows on a remote setup too. What size piping to do have feeding them?

@@AdamOpheim I agree, I also have the .63 turbines and am glad I went with them instead of the .82s. Response is very good with a 3800rpm converter and a baby cam. Made 630whp on only 14psi, 16*, 10.5 AFR and E50. This year, shooting for 800whp on 20psi and E65.

@@AdamOpheim Hey Adam, big fan of your builds!! :) I could probably write a book to respond to this comment, so I'll try to be concise. First of all, I was running 2.25" tubes for each side of the engine, into a 2.5" Y, and the wastegate just after the Y, so at the front end of the 2.5" exhaust running to the back of the car. Then Y-ing out into a pair of 2" diameter feeds up to the T3 flanges in the trunk, and .63 exhaust housings. After watching some of Richard Holdener's videos, it became clear to me that most likely my bad response was just because of my engine making no torque. The supposed to be 5.3 actually turned out to be a 4.8, and I had a Sloppy Stage 3 (Elgin 1841) cam in it, along with a very short runner sheet metal intake to fit under the hood of my E36 I was running it in. I put together a 6.0 with the same cam and intake, and it spooled those turbos like mad. But with the 4.8, the (drift) car eased off the line and ran 10.67 @143, on a 2.1-ish 60ft time, and no boost to speak of for the first chunk of the track. I shifted the 4.8 around 8k+, and up there it ripped real good.

@@littleherms3285 those are great numbers and more typical. Folks get a little out of control quoting dyno cell numbers. My setup was non- intercooled , E60, and 8.9:1 or so as well.(241 heads) So the numbers weren't all that stellar. But it hits 20lbs so quickly you'd never know it was a low compression motor. My GT35's really woke up around 17lbs! I think you'll be surprised how much is left in them.

@@tptrsn Thanks! Sounds like that combo was just missing a nice converter. I think a 19-2 stator 9.5 from PTC would have woken the bottom end up a TON and allowed a nice front half to go along with that killer back half! Good to see the gt35's doing work! That's a record MPH wise as far as I know? If you're running the cast gt35 wheel anyway. Is the car pretty light? Highest power level I've seen out of the GT35 is around 800whp and they were beyond tapped at 23lbs on an LS1. I haven't seen any trap worth a darn, myself included. only managed 134, but had issues and was booted for no cage. I always thought mine had 140 trap in it at 3000lbs.

only if you get them from garrett-the off shore versions don't do that

@@richardholdener1727 Yeah buying 2 gt2867rs from Garrett would definitely not be a budget build xD. Great turbos for a B-Series as well if you don't have lofty power goals.

we could use gt3076s at this power level

thnx-it has been amazing

@@richardholdener1727 you are a hard working guy, you deserve it

Not too many people use twin turbos in a compound or sequential setup of a gasoline engine. Thats more for diesel stuff

NO MAPS FOR MOST OF THESE

@@richardholdener1727 Are the twins the GT 3582R? www.garrettmotion.com/wp-content/uploads/2018/05/Comp-Map-GT-3582R.jpg I haven't found the map for the single yet.

@@hondatech5000 that's a broad claim. there's numerous apples to apples real world comparison where the billet brings in power alot sooner.

@@SoFLaZ06 due to aerodynamics not weight

single vs twin is a non issue-turbo sizing vs na power curve dictates spool response

I have several twin BBC videos up

I think he said what it was in the prior video...? Seems to me like the back pressure was just a little higher than boost in the high RPMs. Like maybe 15-ish..

Second that! Really curious to see the same tests on an LQ4 or Ly6 just to see the low rpm response difference.

If it's an ebay gt45 with a 1.05ar. You won't feel it until maybe 4500rpm

Anyone make gt28s that aren’t internally gated? What about two small BW turbos?

twins can be set up in many different ways - parallel like this, sequential or compound. the Skyline GTR, FD RX7 (and supra I think) run twins from the factory in sequential setup. More complicated, but the idea is you get the boost response from ONE smaller turbo low down and then the second one has exhaust diverted to it later when the first one is running out of legs. they're inline 6 and rotaries though - v8s sorta lend themselves to twins due to the exhaust layout, but this video proves that a big single can be probably cheaper and easier to fabricate without any major compromises - and in fact is probably easier to size appropriately.

I have tests up on singles as well

what is gmt gearheads?

size the turbo for the desired combination of power and response-a single Gt3582 will be responsive

NOT IF YOU SWITCH EXHAUST FLOW OVER TO BIG TURBO

WASN'T THIS A SINGLE VS TWINS?

@@richardholdener1727 Yessir, but at the very end you compared the Summit turbo to the other GT45. I'm wondering what are the factors that make the GT45 a better match to the 4.8 than the summit turbo. That part wasn't really explained in your video.