Thread: Twin scroll manifold options

It is all over rated!

Brent

A nice simple equal length will do the job just fine. Especially with the turbo you have now.

While we're at it, have you given variable vane turbos a look? Some decent sized (smallish) diesel units can be had now for a good price.

that may be worth it, I rather variable vane over twin scroll setup if i had to choose where my money went.

Brent

Heres a SR dyno of the twin scroll vs single scroll, .63 T3 vs the new .78 split T3.

At some points the gains are as much as 40hp and 29 ft/lbs.

Hp: Red=Single Scroll GT3076, Blue= Twin Scroll GT3076



Torque: Red=Single Scroll GT3076, Blue= Twin Scroll GT3076

Have you found anyone actually getting them to work properly? I think someone tried one on the other board but didn't have the controller for it or couldn't harness it's potential.

OK FIRST OFF...... NO... Second of all, any power gain seen on those dyno charts were, A. Because of a timing increase, B. because of the larger A/R exhaust housing, OR C. the fact that the car may have been cooler one run!! Also with the twin scroll there should have had an increase in spool, which means it "should" have made more torque sooner. Also the housing sizes one being a .63 and the other being .78 means you are gaining exhaust efficiency with a larger housing but loosing spool, well thats where the twin scroll comes in.. So the only thing that this chart shows is that a larger exhaust housing yields more power and a twin scroll will make it spool faster. So don't mislead people into thinking that a twin scroll yields power, because it doesn't!

Ben you are right about that Full Race manifold those cylinders are paired wrong.

I know the overall benefit, but on street cars and non-competition cars, why would someone pay the $600 + premium for a twin scroll manifold when they can get similar results with an extra lb or two of boost? (based on big turbo setups)

I don't see the necessity. I have built and helped design 5 different turbo manifolds for the FWD, with the lack of space (especially on street cars needing full radiators, fans, possibly AC and so on) there just isn;t space for the extra tubing. But, you can all do as you wish.

Brent

What 1-2 lbs of boost does not show on a street car its the transient responce.. its like to have a small turbo but with more power.. I have done 1 car with TS with a 50 trim and a t3 0.84 divided turbine (agu motor) before its was with a 2871 0.86 t2 and the transient responce its night and day of difference... That its why I opted to go this route...I havent dyno this car becouse the ower its not in the country right now but as soon he get overe here I will show some logs and data.
Well I can of agree with being more expecive to build a TS setup rader than a normal one.. the trade off of $$$ on my sincere opinion its not worth it for the regular guy ...but for people that want a very responcive setup without loosing top end power( big power setups) the Ts its a very good alternative.
Cheers.

^^^ this is the reason for the twin scroll setup. Transient response. Though the boost onset will be very similar, the response to throttle input is drastically improved with twin scroll. I would like to keep the gt3076r turbo, and maximize it. And if I want to throw on a gt40r later on I can do that too They make it in a t3.

The higher the boost, the higher the shaft speed. The higher the shaft speed, the more lag. Plain and simple. That is why I am looking into TS. The gains from going to a tubular manifold alone would be very impressive, but I want to work on the throttle response area. So I have decided to go twin scroll and put the light flywheel back in. I think it would be a killer setup.

Ben, the ramhorn style is what I was looking at, but modifying it for a TS setup. IE swapping cylinders around. I wish full-race made a twin scroll setup for the VE FWD