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mrflames
03-29-2005, 01:53 PM
can anyone tell me what kind of fuel pressure you have to have on a tbi. isnt around 16 to 18. i am looking to get a new inline pump for when i put the fuel cell in. any good ideas on a pump to use
Whifflebat
03-29-2005, 02:05 PM
11-13 or so from the factory, it varies.
mrflames
03-30-2005, 07:59 AM
11-13 or so from the factory, it varies.that seams alittle low to me
CKTA
03-30-2005, 08:32 AM
As per Whipple and the stock readings off my '94.......12-15 at idle.

Most info out there states 11-13, but the guys at whipple told me different and stock at idle mine was at 14 on 2 different guages.
CKTA
03-30-2005, 08:35 AM
can anyone tell me what kind of fuel pressure you have to have on a tbi. isnt around 16 to 18. i am looking to get a new inline pump for when i put the fuel cell in. any good ideas on a pump to use

Your PSI maybe that high because of the 383. Just a thought.
Boosted-Z71
03-30-2005, 08:02 PM
My 87 is happy at 14 psi at idle. Any more FP & she gets rich.

Boosted
CKTA
03-31-2005, 05:16 AM
My 87 is happy at 14 psi at idle. Any more FP & she gets rich.

Boosted


The '87 is somewhat stock-ish right?
bigredtrk1991
03-31-2005, 06:53 AM
The factory sets the FP from 11-13, which is pretty low. If I remember right, the manual states 9-13, but my truck won't even start on 9! That why the TBI's respond well to upping the FP after a couple of modifications, they tend to run lean from the start.

Mine runs 13.5-14, with the stock regulator made adjustable. I'm pretty sure the stock pump is only good to about 15psi.

You'd need a lot of modifications to need 16-18psi. You could buy the 18psi pump and use a good aftermarket regulator to tune it down.
Boosted-Z71
03-31-2005, 01:57 PM
CKTA: The '87 is somewhat stock-ish right?

Vortec 4 bolt block, Vortec heads ported / polished, LT4 cam & springs, 1.6 roller rockers, GMPP Vortec / TBI intake, 62 lb matched injectors, Flowed & polished TB, ADJ FPR, injector spacer, thinned throttle blades & shafts, TBI CHIP, Headers, duals....

Yeah its mostly stock :naughty:


Boosted
CKTA
03-31-2005, 02:02 PM
You'd need a lot of modifications to need 16-18psi. You could buy the 18psi pump and use a good aftermarket regulator to tune it down.

Correct, I have a TPI pump intank for the Whipple running 10 PSI. I only had to bump it up to 15 PSI at idle tho.
CKTA
03-31-2005, 02:02 PM
CKTA: The '87 is somewhat stock-ish right?

Vortec 4 bolt block, Vortec heads ported / polished, LT4 cam & springs, 1.6 roller rockers, GMPP Vortec / TBI intake, 62 lb matched injectors, Flowed & polished TB, ADJ FPR, injector spacer, thinned throttle blades & shafts, TBI CHIP, Headers, duals....

Yeah its mostly stock :naughty:


Boosted

:lol: yes, stock :lol:
mrflames
03-31-2005, 03:12 PM
i was looking to bid on this set up but i called holley and they said that it only put out 14 psi and that it would not be enought to run mt tbi http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33555&item=7964947611&rd=1&tc=photo i guess i have go with this on http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFP/12-920.html