What Can The 25 Head Rev To

[R31Nismoid]

real world results from many users suggest otherwise tho

Never seen someone tune past AFM limit? Happens all the time.

My GTR was making 340rwkw with stock AFM's (which is 40-50rwkw past limit). AFM voltage means nothing.

[Nee-san]

Same here, my GT-R made 330KW on stock AFMS, I could literally watch them on the hand controller, maxed out at 5000RPM....whilst I revved it through to 8.

[DVS JEZ]

Can be done but best not to. ^^^

[Nee-san]

Yup Totally agree, Old school jap style.

That's why I bought Z32's two of dem.

[r33_racer]

I thought the main problem with the neo head was you cant get high lift out of the valvetrain. So there isnt many camshaft choices, making it a shitty head to work with, more so when you are aiming for big power.

[Legionnaire]

real world results from many users suggest otherwise tho

True.

There was a  scan of nismo afm speclist on here somewhere that plotted factory GTR afm, Z32 afm and nismo rr580 afm on voltage vs. mass flow axis. Z32 and nismo graph went only up to 1000kg/hour. 

I've taken a VQ table off a Z32 ECU and first extrapolated mass flow vs. VQ values at voltages up to 5.12V, then extended the graph, see attach. Based on factory VQ table Z32 AFM can measure flow all the way to 1740kg/hr, ~ 64lb/min.

Assuming BSFC of 0.55 lb/hp*hr and 12:1 AFR this equals to 582 crank hp.