Ok guys...

After years trying different all motor B setups I decided to change platform and went with an F22A1, boosted

The thing is... I'm using a QSD flange, and for the angle the engine sits, it's impossible to fit the stock IM.

I need to build something simple, yet efficient, to keep the motor breathing on the upper RPM range as I'm gonna use a fairly small cam (bisi 1.2) but I want to avoid it from falling on it's face after 7K as it usually happens on the stock intake.

the question is:

I've been through many runner size calculators but they all seem to give me different results so i'm getting a little confused on this...

I tried to make my own calculations based on cam duration and sound speed and I got the following results based on a 260deg intake camshaft and a 7000rpm peak:

considering the sound travels at 340m/s at 7000rpm it should travel 3.74m between valve closing and opening again, that means an ideal runner lengh to get advantage of the first harmonic should be 187cm...

of course that would be too big of a runner so cutting it down to the 8th harmonic (i guess) it would be down to 23cm runner lenght.

Is that about right?

the other formula I found on Team Integra, to define runner diameter, resulted in a 50mm ID, does that sound right?

as far as plenum volume, I found that going big would give a better top end but I don't want to hurt throttle response so much as the car is going to be used for road racing as well, so a 3.5L plenum should do the job. Right?



Last but not least, can I benefit from the sound waves to help turbo spool? Using it the opposite way as at the intake...



Engine specs are the following:

H22 rod EVO piston setup
8.3:1 CR
bisi 1.2 cam
The Shodan Silver Surfer turbocharger

power should be at the 400~450hp range

everything else will be custom made



Thanks in advance

 

anyone?