Pete91

iTrader: (4)

Okay guess just curious how much my fpss should be set to. I have a jy lq4 with Prc 2.5 6.3 heads. 244/234 reverse split 114 lsa 6xx/6xx cam fast 90/90 and a 90mm nos plate kit. I'm going to assume my fpss is set to 50psi. On motor since the pump went in it drops to 55 psi under wot. I sprayed it for the first time with this set up last night and on a 150 shot its drops to 50 and fpss shuts the nitrous off. Can I lower the fpss to say 45 and see if the fuel pressure holds at 50psi? I'm just curious what psi it drops to where I am safe and what point I should add another pump. My previous set up was very similar with everything with the exception of a smaller 234/244 112 598/608 cam all on my old ls1 short block. Thanks guys. I know these pumps are suppose to support 600-650 rwhp and I think the car makes around 410-430 whp through a th-350 and a 12 bolt just to give you an idea

Pete91

iTrader: (4)

Ps I didn't have this prob with the ls1 set up obviously I know it's a bigger cam and a bigger motor so I know it's possible I could be making around the 600 area on the shot. More interested if it's safe to lower the the fpss to 40-45

Racetronix

iTrader: (2)

The base pressure should be 58PSI so that the jet-pump functions properly.

Pete91

iTrader: (4)

I'm not following this response. What is the "jet-pump" how do I control the fuel pressure with out a fpr. The only thing changed on my fuel system is the the racetronix pump and Hotwire kit, maybe I wasn't clear everything else us stock down to the injectors lol.

Racetronix

iTrader: (2)

Jet pump is explained here:
http://www.racetronix.biz/itemdesc.a...A-001A&eq=&Tp=

If your FPR is factory you can not control it.
Pressure drop down to apx. 52PSI is normal when pushing the limits of the FPA-001 due to the location of the factory FPR.