Yep, you are 100% correct. More pipe = more lag = more places to leak = more problems.

A FMIC, in my opinion, is not an option as you will agree.

Once again, I can see why that would cause a problem as well. The only way, that I can think of, would be to use larger openings on the side; much like the pictures on the 997TT spy shots. I am not sure how much I like these side gills, however. They seem to take away from the traditional Porsche stance.

The larger "gills" will allow for more air flow = more cooling efficiency from the intercoolers

 

Contact Rob King. Two year ago they cost me about 6K. The biggest cost is the cores.

 

Eric,

Take a close look at my cores. Same source. RS has those made for them. We got the cores and built everything else around them.

 

Gemballa's top mount intercooler, like KPV's, is in addition to the regular side intercoolers.

The larger side openings is what I was talking about before. Ok, maybe not as large as this picture of the 997 turbo, but shaped different to gulp more air than the stock ones.

 

Hey Craig & Speed Gallery, the [boxy] collector on the 1 end doesn't look like the optimum design as outlines in book Chad used to refer to frequently (which I bought and refer to often) by A. Graham Bell, "Forced Induction and Performance Tuning". The square end on 1 side looks anything but promoting smooth airflow.

Chad, the efficiency stats on your intercoolers sound impressive, but wouldn't they be even better if the collector on the 1 end covered 100% of the width of the intercooler? It appears to only cover about 75%. The other end appears to be very well designed as does the 1 end shown of the RS Tuning IC.

Mike

 

Here is the problem with the Gemballa unit:

Too much piping. The theory is sound, but the reality of the application is flawed. The more piping that you add to an intercooler-type system, the slower the boost response and the more lag you will see. With the Gemballa system, the turbos now have more pipe and one extra (large) intercooler to pressurize before the air makes it back into the throttle body. The turbos need to pressurize 3 intercoolers and many feet of piping. That takes time and will work your turbos even more.

Is the cooling effect provided by the extra intercooler worth the extra lag, turbo use, and response? I cannot answer that as I do now own the unit.

 

 

 

Mike,

The turbo side end tanks used by SG are not a box. Rather, these end tanks are triangular, with the back wall of the end tank (opposite the intake pipe) sloping towards the intercooler -- this sloping of the end tank directs the air towards the intercooler. The sloped back wall is not visable in the close-up photo of the turbo side end tank (other than by looing through the intake pipe), but is slightly visable in the other photo of the entire system.

Craig

 

one more

 

That makes more sense. It looks like it is a 4 sided box.

Mike

 

Here are a couple more photos that show the sloping back side of the turbo side end tank:



Craig

 

Sounds kind of ricer (also a bit litke the GT1/McLaren F1 roof scoop), but how about a scoop/NACA duct on the roof to pull air down into a rear-mounted intercooler? The ducting from the scoop runs the length of the roof and window feeding air to the intercooler. Ruins the view out of the rear window though. Or just get a larger tail (a la the whale tail- hey, it worked on the 935).

I remember reading an article in a British Porsche magazine discussing the original Ruf Yellow Bird. It had NACA vents cut into the top of the rear fenders. The air collected by the whale tail created so much pressure that air was actually pushed out of the NACA vents; hence, no NACA vents on production Rufs of that era.

 

Here's an old picture, but this is what a big intercooler looks like. It was the one fitted to my Skyline R34 GTR (my R32 GTR drag car also had the same size but with twin intakes). Picture is my tuner not me......

 

Guy .Is your tuner the ex Lista Mech from the Lista GT1 days.

Neil