How much CFM does the stock Y pipe allows?

 

We're making an assumption that the bottleneck in flow is the Y pipe. Do we know this is true?

 

Final numbers and specifications will be released soon.

 

where the connections are made with the intercoolers the inner diameter is only 44mm, let's assume we're talking about a 700hp car, the air velocity inside the Y-pipe (44mm) will be 535mph, air becomes turbulant at 300mph
on a 480hp car (standard) the air velocity in this part is 303mph so to be honest Porsche didn't do a good job!!

greetz mando

 

If the bottle neck in flow happens between the airbox and the intake pipe, the flow through the Y pipe may not be the rate limiting step. So I throw the question out there...if the Y pipe diameter is increased, but the intake pipe is still narrow, will flow be improved?

 

yes because you take some stress away (backpressure) from the turbo chargers. It will create a higher velocity in that pipe but this also has a extra benefit as the underpressure will draw-in air more agressively till a certain point!
most tuners modify the pipes and airbox in one of the first stages anyway

greetz mando

 

IPD Mike was mad that I already had one on my 997TT that we made and wanted to release his but he could not make any power. Its good to see that they have done the testing to release a product that works well. They must have made improvements.

 

Thanks for the answer and math. The video shows the stock plenum flowing 965ish CFM. Since the stock plenum flows more than the motor needs (826.02CFM) where would any benefit come from?

 

dont forget that the efficiency of a turbo engine is better, you put a lot more than 3.6l of mixture with the turbocharging. This math applies to a N/A engine.

i assume it's pretty easy to replace those bottleneck with some pipes like Samco, someobe should get the techart pipes and make some plastic replicas....

 

Same thing i was thinking, i would prefer a set of carbon fiber replicas

 

Wouldn't a simple back-to-back test on a dyno resolve this question?
It seems logical that if this component is the bottleneck, improving flow will improve power. If not, it won't have any positive effect on HP or torque.

 

This component will do nothing to a stock engine. Both Techart and Cargraphic offer them with power kits over 600hp with modified VTGs.

 

I'm waiting some progress about this part from Dan, so everybody can try to see if there is any gain with this carbon part, or not.