Twin Turbo vs. Single Turbo V6: A Dissertation

Red__Zed

it is not terribly difficult to construct one though.

you are neglecting the efficiency opportunities afforded by a larger turbo.



I always laugh when people make statements like:

and back them up with this:
rather than numbers. I understand you are running business, but isn't it good enough to just point at that there is nothing on the market that offers similar performance in a single, rather than broad, sweeping statements that cannot possibly be supported?

Can you share the numbers you've looked at? I would love to see them.



I understand that, but you don't necessarily increase the MOI a lot to bump up flow. You wind up coming VERY close in terms of total MOI, and the efficiency of a single turbo can get things very interesting. Turbine clearance needs alone create a huge opportunity for gains in efficiency, not to mention the pulse density.





At some point this becomes trivial relative to other gains (pulse efficiency, etc). Obviously systems like the STS don't effectively leverage it.




I'd love to see them. I imagine the wrapped SS will be much better than you expect.

car8oy281

twin 2860rs are only good up to 550 at most whp. anything over that the intake air temp gets pretty high and pushes them way out of there efficiency. comparing two 2860rs to a single 4094r is absolutely ridiculous. a single 4094 will.make more power efficiently and with a lower iats then 2860s any day. yea you will sacrifice a bit on torque side but the top end side of things is pretty retarded. on 16 psi of boost on a 4094r on a rev up de with cosworth cams and port work, we full spooled a 4094r with a 1.06 hotside at 4100rpm. and was on stock headers and stock intake manifold. cam timing was mild in the midrange. spool up timing was at 9 degrees and it was on pump gas.

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Seb@SZ

We've made easily over 630+whp on the 2860RS' (VG30DETT). The highest around 670 whp. This of course is done on race fuel. At a mere 12 psi on a VQ37 they can make 550+whp (with the right parts). On setups\turbos that are inefficient you'll see the boost go up but the power gains are minimal and start to drop off drastically, this is a good sign the turbo is pumping heat. Contributing factors are not only the turbo but the supporting modifications for example the piping diameter of the inlet, outlet, and exhaust piping as well as the VE of the engine.

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Boosted Performance

This topic can be discussed for ever, but in the end the ST kit still holds the top two spots:

1. InjectedPerf------04 Glide Enth 100 shot( IP 4.0L ) IP ST _8.801@159.19mph 1.485 60ft Dr's
2. Hal@IP -(daily)---05 6spd -Tour ------------(Built) IP ST _9.349@145.00mph 1.500 60ft Dr's
3. SoundPerformance -04 6spd -Enth ----------- (Built) SP TT _9.355@158.52mph 1.466 60ft ET Drag
4. need4boostz-------05 6spd -Enth ------(Built) 850s JWT TT 10.301@145.83mph 1.808 60ft Slicks
5. Bldrz ------------04 TH350 Base 50 shot (Built) Greddy TT 10.375@132.41mph 1.567 60ft Slicks
6. AudibleMayhem ----03 TH400 Tour 100 shot(Built) Greddy TT 10.404@134.00mph 1.729 60ft Slicks
7. neverenough ------08 6spd -Base ---------- (Built) GTM TT 10.673@135.70mph 1.677 60ft DR's
8. MRCMortorsports --03 6spd -Tour -----------(Built) APS TT 10.740@130.67mph 1.649 60ft Slicks
9. SnyperZ ----------04 6spd -Perf -LS2 w/Cam-Custom 88mm ST 10.840@138.62mph 1.852 60ft DR's
10. BriGuymax -------03 6spd -Tour -----------(Built) APS TT 10.967@126.84mph 1.587 60ft DR's

SharpByCoop

^^^ What is this chart from? Thanks.

"but in the end...." Huh? Complete race cars up there. The OP's premise starts at the beginning. I get your point, but it's irrelevant to a first time build.

Coop

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roplusbee

Man, the JWT kit is a beast. Traction must be a real problem based on the 60'. Could have been a variety of things though.......

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blackonorange

Yea this chart is irrelevant

Kingbaby

You guys never cease to amaze me...

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FL 4Motion

what part, our vast automotive knowledge or our striking good looks???

Boosted Performance

How so? The thread states (to sum it up) that the TT kits are superior to a ST kit on a VQ, yet the top two of the best, verified drag strip slips on the VQ are using ST kits.

b1adesofcha0s

Perhaps both?

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roplusbee

The chart does have 2 STS kits on top. The JWT car could have done better with a lower 60' time and better launch. But the numbers tell the story here.

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Red__Zed

To be fair, the thread is mostly about street use.

tower74

Are those STS or just unknown Single Turbos?

blackonorange

One of them is an ls2 ........ Fail