Does anyone have...

[Sajk]

Sorry for the teaser title.

Further to my cai thread I would really like to know what airflow people have logged at or close to sea level in a 2.8 or 3.0 engine. I am at 5500 feet above sea level and on a mission to make up the about 18% power penalty that this brings and I would like to see how close or far I am away from that goal.

Cheers

 

[NZ00Z3]

I have TestO, and a 3.0L Z3 so can run high snapshot data capture.

A couple of probably dumb questions about how to capture the test results.

• Red line is at 6,000 rpm, so you want data at this RPM?
• Does it need to be 6,000 rpm in top gear (Scary late night runs dodging rabbits and Wallabies at super high speeds) or would 2nd or 3rd gear be OK?
• Is mass air flow the only data you require or is there a need to correlate to standard temp and pressure, so need air pressure and temp?

Here is a chart from a 2.0L and 2.5L M52TU engines, both with M54B25 inlet manifolds (almost exactly the same as the M54) that I have played with previously. Putting the data into a per unit (1L) base is interesting. So, it could be any sized engine at full rpm with the throttle wide open?

 

[Pingu]

I use 2nd gear and try to accelerate as hard as I can from around 1800rpm to max revs using WOT.

Just make sure it's dry, as you need to avoid wheelspin or the data is corrupted due to engine load being reduced while the wheels are spinning.

That graph doesn't look like a quadratic. It looks more like a straight line, so I'd be tempted to try to match y = mx + c

y = 0.0095x at a guess.