Z32 MAF Airflow % (SAFC)= Approx HP ?

[DriftS14]

I just swapped in a Z32 MAF and all is well. As I took it out for a spin I started looking at the airflow percentages and I saw how different the readings are. My airflow percentage is reading 44% now as opposed to 100% from the stock MAF. Now my question is, If we know the max airflow capability of the Z32 MAF (~500hp), couln't we approximate the horsepower the engine should be generating by dividing the percentage into ~500 HP? Just a thought.

[extheflow]

yeah....that would work.not for an exact number as driveline losses will be different between different cars, but it would be +\- 5% or so.

[MainEvent212]

makes sense...that gives you approx. 220 hp

[DriftS14]

Question is, how much can these 370cc injectors hold? I'll crank the boost if I can.

[s13sr20chris]

not much. it has been said that 250 rwhp is pretty much the max on the stock injectors. you most likely wont get past 240 from what people say.

[AX75F92]

DriftS14,

That approximation will not work for an L-Jetro (air flow meter type) setup. The reason is because the Z32 AFM is a hot wire meter. The voltage map (which voltage values the meter associates with a given volume of air flow) is not linier on a hot wire. A hot wire map will show voltage as the Y axis and air flow as the X. Rather than simply drawing a straight diagonal line from the lower left corner to the upper right corner of the map (which would represent a linier characteristic), the hot wire meters voltage characteristic resembles an upward curve. Therefore any calculations you may derive from simply dividing your air flow percentages will come out drastically incorrect. Follow me?

Interesting idea though. I guess it should probably work on a D-Jetro setup. MAP sensors have linier voltage maps.

[DriftS14]

Thanks for the explanation man. I didn't know any of that. I guess I'll have to go to the dyno after all. Thanks again

[s13sr20chris]

if you can get on a consult II unit then you may be able to see your mass airflow in grams/sec. that could be usefull for calculating a rough horsepower figure. i wish there were easily available voltage tables as ax75f92 mentioned.