Does the stock fuel pressure regulator have a 1:1 Boost/Vacuum Rise Ratio?

 

Yes it does

 

they do. whats your power goal?

 

chimed in. im looking for around 350-400whp. will the stock regulator be ok?

 

Yup...stock fuel rail and regulator are good for around 500whp. The stock FPR is more reliable then probably many of these aftermarket ones.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpoolnG2 &raquo;</TD></TR><TR><TD CLASS="quote">Yup...stock fuel rail and regulator are good for around 500whp. The stock FPR is more reliable then probably many of these aftermarket ones. </TD></TR></TABLE>

i would say rail and adj reg to 500, both stock around 400

getting up that high needs adjustments in base to work with bigger injectors.

 

Until recently when I have decided to go bigger I have been making 479whp on a AEM Fuel Rail with the stock FPR and 1000cc injectors.

 

ok i should say in my exp then.

 

Fuel rail in the 400's, I have yet to see a need for an aftermarket regulator but I also haven't been given a car still equipped with one past 636 whp. So, that's the extent of my knowledge on the subject but I'm willing to bet money a stocker is good until 700 or more.

FYI, not all stock FPRs are created equal. Compare some and only use the "big exit" FPRs when pushing past 400 or using a 255HP or larger fuel pump.

I've never needed to adjust base pressure, and set all aftermarket FPRs to stock, anyway. I tune primarily 1000cc, with a few 1100-1200cc injectors like this. The last car I upped the fuel pressure with Precision 1000cc to get more top end out of them ended up running a bit crappy at idle, I don't think they liked 55 psi base FP from an A1000, and they didn't require a whole lot or even any of leaning out under boost coming from the previous stock FP tune. High pressures really do fight injector opening events, and I suspect I could have hit 717 without fooling around with the FPR since the car nets a .38 bsfc.

 

I have a question on oem fpr as well. I bought rc 750cc injectors, and I called my tuner to see what else I would need. He told me to get an aftermarker fuel rail and a 200$ fpr.
The thing is I have a greddy kit, and I will only be making ~300 whp. Do I really need all those extra parts?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowassgsr &raquo;</TD></TR><TR><TD CLASS="quote">I have a question on oem fpr as well. I bought rc 750cc injectors, and I called my tuner to see what else I would need. He told me to get an aftermarker fuel rail and a 200$ fpr.
The thing is I have a greddy kit, and I will only be making ~300 whp. Do I really need all those extra parts?</TD></TR></TABLE>
Wow, reading comprehension and some people. Do you disregard info unless it directed solely at you? Read the previous post.

 

i made 710whp (dynojet) on stock regulator and fuel rail

im in no way saying i suggest doing that, i was just working with what was brought to me for a tuning appointment haha

 

i was just wondering if a stock regulator with a walbro 255 pump ok for boost? the pressure is around 45-50. i heard that having too much fuel pressure will cause your cylinders to become distorted (egg shaped).

 

damn thats some SERIOUS fuel pressure if its strong enough to distort your cylinders!!!!!!!!!!!!

 

Cool beans. I will then set my map for 750s and take my car to get it tuned.