Safe Fuel Pressure ?? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

goldtl · 07-16-2006, 06:25 AM

Here's my setup, HKS GT2530, upgraded injectors (unknown size), LAP tuned ecu (unknown settings) walbro pump, nismo FPR and STOCK MAF. My car was running extremely rich with the stock fuel pressure psi... it was only putting about 220 rwhp on the dyno. After adjusting the FPR down a bit by "feel", i was able to put out close to 300 rwhp. Afterwards, i was curious at the psi setting. It turns out to be 20 with vacuum and 30 psi without vacuum. Should I be worried?! This seems pretty low. But my AF ratio appears to be pretty good. Here's the dyno:

***S14DB*** · 07-16-2006, 09:12 AM

Your Fuel pressure is 20 and 30psi? That's hella low.

slider2828 · 07-17-2006, 12:04 AM

You are probablhy going to run lean and blow something for sure... Normal under boost should be stable around 40 stock, but I put 55 just in case....

07-16-2006, 06:25 AM	#1
goldtl Join Date: Sep 2004 Location: boston, ma Posts: 26 Trader Rating: (0) Feedback Score: 0 reviews	Safe Fuel Pressure ?? Here's my setup, HKS GT2530, upgraded injectors (unknown size), LAP tuned ecu (unknown settings) walbro pump, nismo FPR and STOCK MAF. My car was running extremely rich with the stock fuel pressure psi... it was only putting about 220 rwhp on the dyno. After adjusting the FPR down a bit by "feel", i was able to put out close to 300 rwhp. Afterwards, i was curious at the psi setting. It turns out to be 20 with vacuum and 30 psi without vacuum. Should I be worried?! This seems pretty low. But my AF ratio appears to be pretty good. Here's the dyno:

07-16-2006, 09:12 AM	#2
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Your Fuel pressure is 20 and 30psi? That's hella low. __________________ Comments should be taken as Opinions not as Statements of Fact

07-17-2006, 12:04 AM	#3
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	You are probablhy going to run lean and blow something for sure... Normal under boost should be stable around 40 stock, but I put 55 just in case....