3.3t manifold research

[7thSonEngineering]

Good!
I think C inlet is 44 mm if I remember. So 49 mm can probably fit, I guess that will make around 50 more hp/turbo, 100 total.

From my research, the people that have stufed turbos make more horsepower on the dyno but They aren’t actually faster in any metrics. My conclusion is that has to do with the wastegate area and back pressure which leads to lifted heads.

 

[BIG-D]

They are fitting a suburu ball bearing cartridge over here whatever size those inducer and exducer wheels are ?

 

[Thomby]

Will the compressor side be enought to increase power?

John from Tork proposed that the bottleneck in our manifolds is preventing sizable gains from "stuffed" turbos (larger wheels in stock housings) because too much pressure/heat builds up between engine and turbine.

@7thSonEngineering cut one open and said there's no specific bottleneck in the manifold, aside from the wastegate port.

So I believe the theory is that by relieving excess exhaust heat & pressure, the turbine efficiency will increase and the stock turbo will flow more at the same pressure.

Now it may be that the compressor side is out of its efficient range and will just blow hot air, and if that's the case, a larger WG should mainly benefit stuffed turbos. But if the high rpm dropoff in power is due to exhaust restriction, hopefully the WG mod will improve even stockers.

 

[Corleone1]

From my research, the people that have stuff turbos make more horsepower on the dyno but They aren’t actually faster in any metrics. My conclusion is that has to do with the wastegate area

Yes, probably so. Backpressure is that kills power. Hotside is always the biggest restriction. In our GTRs we can make +100 hp just to go up 1 step in hot side. Also we remove all exhaust and just kept Downpipes, it maked over 100 whp more.

Also you are at the right way with wg valve, we can see increased power by go for just some more open wg even if the boost decrease. All about backpressure...

I think you all can feel that to if you drop some psi after 5000 rpm, it feels faster then.

John from Tork proposed that the bottleneck in our manifolds is preventing sizable gains from "stuffed" turbos (larger wheels in stock housings) because too much pressure/heat builds up between engine and turbine.

@7thSonEngineering cut one open and said there's no specific bottleneck in the manifold, aside from the wastegate port.

So I believe the theory is that by relieving excess exhaust heat & pressure, the turbine efficiency will increase and the stock turbo will flow more at the same pressure.

Now it may be that the compressor side is out of its efficient range and will just blow hot air, and if that's the case, a larger WG should mainly benefit stuffed turbos. But if the high rpm dropoff in power is due to exhaust restriction, hopefully the WG mod will improve even stockers.

100%!

 

[7thSonEngineering]

Left hand and right hand turbos. These will get their wastegates ported to 28mm and either go on my vehicle or be sold. My plan is to only swap the exhaust housings not the actual CHRA.