Thread: Z32 maf voltage

This is for future reference. If you have any contribution please add. Tell us how much power you put down (dyno type) and your Z32 peak maf voltage when that WHP was reached.

On the dynojet I hit 4.52V peak and made about 361whp corrected.

The dynomite yesterday, I had 4.77V peak and put down 379.9whp.

Please add to this what info you can. Thanks.

What RPM did the MAF voltage peaks occur?

7200rpm.

Peak power was at 7200rpm. Injector duty (740cc) was 83%.

I am pretty sure that around 4V on the maf you should be around 300whp. 4.5V should be around 350-375whp. 4.7V is around the 400whp mark?

Not so easy to ballpark the voltages as they are not linear.

Someone good in math could calculate the curve of the voltages and make up a respective curve in WHPs??? (Not so easy or accurate as we would want)

Ya, I understand that. The maf voltage is sorta exponential. So I just want to get a sort of idea on where it would be ballpark.

You can already see the voltage isn't linear when 360whp is 4.5V and 400 is around 4.7V.

Using the values from the MAF VQ table for A Z32 MAF:
4.00V = 31689
4.52V = 47156
4.77V = 56223

^^^ What is that? Please explain.

Those are the MAF voltage to Q (mass flow rate) numbers from the VQ table used to calculate TP. You are correct that the VQ table is non-linear, and different MAF sensors output different voltages at the same mass air flow rate, so the Q numbers would be better to use for your HP prediction, rather than voltage.

Dave

So what unit are these Q numbers in? And ho can you calculate flow rate to hp? Any ideas? It would be cool if we could relate the mass flow numbers to some sort of HP prediction. Even if it had a accuracy within 15% it would still be a really cool tuning tool. Small adjustments would show up as a change in flow rate...