Ideal fuel pressure on 347

Scrapla · 06-14-2006, 02:21 PM

I have a 347 in my 90gt. I just installed a 255lph fuel pump with 24# injectors. The car is NA. All KB forged internals with about 11:1 compression and aprox. .500 lift with 1.7's. I have edlebrock performer heads. TFS street heat upper and lower intake fed by a 65mm TB, BBK cold air attached to a lightning 90mm mas air calibrated to the 24#ers. I have a bbk fuel pressure regulator which can goto 70psi waiting to be installed. I was running 40psi with the stock pump on this set up. What are you NA 347 guys/gals running?

lx mike · 06-14-2006, 06:48 PM

Every combo is diff in what they need.

fiveohpatrol · 06-28-2006, 06:56 PM

i run 45psi base with mine with 30# injectors. You should be atleast that high, likely higher. Only way to really know for sure is to check it with a wideband A/F meter, either on a dyno or at the track.

06-14-2006, 02:21 PM	#1
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Ideal fuel pressure on 347 I have a 347 in my 90gt. I just installed a 255lph fuel pump with 24# injectors. The car is NA. All KB forged internals with about 11:1 compression and aprox. .500 lift with 1.7's. I have edlebrock performer heads. TFS street heat upper and lower intake fed by a 65mm TB, BBK cold air attached to a lightning 90mm mas air calibrated to the 24#ers. I have a bbk fuel pressure regulator which can goto 70psi waiting to be installed. I was running 40psi with the stock pump on this set up. What are you NA 347 guys/gals running? __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

06-14-2006, 06:48 PM	#2
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	Re: Ideal fuel pressure on 347 Every combo is diff in what they need. __________________ Rice Haters Club Member #101

06-28-2006, 06:56 PM	#3
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	Re: Ideal fuel pressure on 347 i run 45psi base with mine with 30# injectors. You should be atleast that high, likely higher. Only way to really know for sure is to check it with a wideband A/F meter, either on a dyno or at the track. __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

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