RPI Air ram scoop fitting

[gib6933]

Its a bit dark outside at the moment but I will post some pix soon as I can.
I warn you it’s a bit ugly at the moment but the final one will have a better finish and be made of carbon fibre or a carbon fibre Kevlar hybrid instead of the GRP weave.

(If all goes well I will make one out of something really special a carbon/iron resin of my own design :spy: )

jez

 

[z200]

eimai mikroteros ara mporw na mathw prwtos
xa xa xa

i megaliteroi proigountai omws

 

[Ale_72]

http://www.m5board.com/vbulletin/showthread.php?t=105408 (dyno tests on a M5)

 

[Curtis]

It always amazes me how you can get power increases like that from a ramair system ( which only works when the car is travelling at speed and therefore forcing air into the intake, hence the name ramair ) while the car is stationary on a dyno. Maybe they were blowing air down the intake but thats hardly the same as real world figures or maybe that WAS the power increase from a stationary car and there's more to come when the car actually moves. Any thoughts?

 

[gib6933]

Your right there is no way you could measure it on a rolling road unless it was dyno in a wind tunnel (I have only ever seen one at lola) the only way is lap times and timed distances.


jez

 

[ZetaTre]

Your right there is no way you could measure it on a rolling road unless it was dyno in a wind tunnel (I have only ever seen one at lola) the only way is lap times and timed distances.


jez

There actually is: there's several software you can hook up on the OBD plug and retreive live data, while driving.
For example you can tast a before and after on the same road and check parameters such as MAF reading, intake air temperature, engine load, etc. You will not get an accurate HP number (not that dyno are accurate to begin with...) but you get an idea on if it's just a placebo effect (convincing yourself you get a positive ROI from you purchase) or there is some real perofrmance increase.
I personally think these will give you a far more accurate and intelligent picture of what's going on with the mod than a dyno

 

[Curtis]

Yes but that would be pure speculation on HP gain. They are showing a dyno graph with specific HP gains which could only have come from a dyno. The point I'm making is that you can't measure ramair gains while stationary.

 

[ZetaTre]

Yes but that would be pure speculation on HP gain. They are showing a dyno graph with specific HP gains which could only have come from a dyno. The point I'm making is that you can't measure ramair gains while stationary.

Totally agree... Mine was just a comment on an alternative way to measure improvements, if any, in a more scientific and realistic way than a "tapet roulant". Quite honestly I didn't even go to the link...

 

[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