adjustable fuel pressure regulator

[urban96]

been thinking since im running rich with my 24lb injectors and stock fuel pressure regulator that i should maybe get an AFPR. i already plan on getting it dyno tuned this spring so i dont know if im going to need one for that.

since ECU dosent rear from sensors at WOT is it necessary to have an AFPR to properly tune or do they just change how long the injectors squirt in the tune?

 

[HISSIN50]

The computer actually does modify the WOT trim on an SN95. On a fox it does NOT. That is why fox guys use the reg's (for WOT performance).

I am not sure that it would help much - the puter might just adapt the pulsewidth back down if you bumped pressure.

But what do I know - Grady and the other wise horsemen will know. Good luck.

 

[legalize420]

if you are running rich, why dont you put the 19's back on. i had to. i was wondering the same thing about neededing one for a tune, i hope to go sometime next week.

 

[final5-0]

The computer actually does modify the WOT trim on an SN95. On a fox it does NOT. That is why fox guys use the reg's (for WOT performance).

I am not sure that it would help much - the puter might just adapt the pulsewidth back down if you bumped pressure.

But what do I know - Grady and the other wise horsemen will know. Good luck.

You know I gotta tell ya'll, the fuel pressure issue is one thing I can say I DON'T know for certain how it effects the tune as I have no hard data from dlogs or anything like that cause I never have owned an afpr.

I have seen many threads where peeps who self tune that I know to be knowledgable have said the pcm will try to negate a change in fuel pressure and THEY have the hard data showing it is so.

So there it is......I don't know the answer...................for sure

Grady

 

[urban96]

if you are running rich, why dont you put the 19's back on. i had to. i was wondering the same thing about neededing one for a tune, i hope to go sometime next week.

well car is getting put away this week for the winter and i plan to make an appt. as soon as i take it out of storage this spring (already have the chip just need a burn)

 

[Pokageek]

I have a new un-used BBK I will sell for $40.

 

[95cobradude]

bbk makes the worst regulators, mine went bad and flooded out the intake, ****in car wouldn't even start.

 

[a50sn95]

I just set mine to stock and work on the AFR with my Tweecer.
As long as I have the AFR I need at WOT, why mess with it? Just adds another variable to an already complicated process....

 

[CManT1914]

Fuel pressure is something you really don't want to change from stock. If you hang around the self-tuning sites, you'll quickly see that peeps always say leave it at stock, even with an adjustable regulator. Why? Too low fuel pressure can lean out the top end of the RPM band, even with it tuned, and ALSO.......... I too (as Grady pointed out) have heard of guys lowering the fuel pressure to lean it out (purposefully) and the PCM eventually compensates and it goes right back to where it was. An afpr is really only a bandaid on a broken bone when it comes to tuning.