blue_hatch

i've just bought a fuel pressure regulator. how much psi is safe for an d16z with basic i/e. right now im about 38 psi at idle and gets up to around 43-45 psi when i open the throttle. i heard in the haynes manual thet you shouldnt go higher than 10% than the stock pressure. ex: if stock was 50 psi, cant go over 55 psi. how much psi is safe?

jlacoy82

Why needlessly increase your fuel pressure? Most you'll accomplish is making your motor run rich.

But I dont know your stock fuel pressure. :\

kevoweb

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlacoy82 &raquo;</TD></TR><TR><TD CLASS="quote">Why needlessly increase your fuel pressure? Most you'll accomplish is making your motor run rich.

But I dont know your stock fuel pressure. :\</TD></TR></TABLE>

would having a air/fuel gauge and making some 10-50 mph runs help as far as setting a psi that wouldn't make the motor run rich help? just curious. i mean it wouldn't beat a vafc and some dyno time, but would it help? i've been thinkin about a fuel pressure regulator.

eK9aT10pSi

make it 40psi at idle. you dont have enough mods to play with ur fuel yet and see results

blue_hatch

yeah when i adjust it a little higher maybe 40 psi it seems to lag a little in the lower rpm. i felt more power with about 38 psi. maybe my egine doesnt need too much fuel.

flood

Fuel delivery hasn't been much of a problem in the history of N/A cars. Its air. I doubt you need more fuel.

leckey73

40 psi is good

GZR4DR

I was running 44psi at idle on a heavily modded N/A motor. For a close to factory motor 40psi is plenty especially for a smaller D series motor.

The only way to properly tune however is using a wideband O2 sensor on a dyno.