RPI Air ram scoop fitting

[Curtis]

I see what your saying however however the procedures your mentioning do not "measure improvements". Even live mapping ie tuning a car via the OBD2 while driving will not give you a "measure" of the improvements it just lets you see the parameters you have changed. You may feel a difference through the seat of your pants but you can't put a HP figure on that. The dyno is the only place where actual HP figures can be measured but it can't replicate such aspects as the ramair effect because the car is stationary and therefore there is no ramair effect. Ramair will of course increase with vehicle speed so even if they had forced air down the intake at a set rate it would not allow for the variation in airspeed under actual driving conditions. I think that any graph showing a power gain for a system that wasn't actualy functional at the time has to be taken with a pinch of salt.

[Mattt]

Surely using a decent dyno fan will give you some indication? e.g. http://www.youtube.com/watch?v=eCZDodUAn8Y

[Curtis]

No because it runs at a set speed and isn't powerful enough to simulate high speed driving when the ramair is at it's most effective. Because it only runs at a set speed there would only be one point at which it matched the simulated vehicle speed, just like a broken clock is still at the right time twice a day. These fans arn't designed to simulate airflow anyway, their purpose is simply to help cool the radiator because there is no natural cooling on the dyno. If you want to simulate airflow, you need a windtunnel.

[czechT698]

does this kit fit on all z4 models??

[pvr]

Not sure - better check the bimmerfest posts on that

[z200]

SO ANYONE MIGHT KNOWS IF RPI WILL FIT TO Z4 MODEL, AND MORE PRECISE TO AN Z4 2.5 2005 MODEL