how much fuel pressure with 24lb inj 255 pump gt40ps and f-cam ! - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 26 Old 07-27-2008, 01:44 AM Thread Starter
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how much fuel pressure with 24lb inj 255 pump gt40ps and f-cam !

i was running 35-36 psi but bumped it to 39 psi and it feels better but still don't know how much to turn it up ! just wondering what other people are running with good times !


93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #2 of 26 Old 07-27-2008, 02:02 AM
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I RUN MINE AT 39-40 PSI.........

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post #3 of 26 Old 07-27-2008, 10:34 AM
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anywhere between 40-45

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post #4 of 26 Old 07-29-2008, 05:56 PM Thread Starter
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anywhere between 40-45
even with the 255 pump ! my car doesn't seem to like it, it started surging pretty bad @ 39-40, but i think my 02's are on the way out ! i ran the car and it felt better....... i'll have to do some testing this friday at the track hoping to get low 12's @ 110-112 out of it this time.

93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #5 of 26 Old 07-29-2008, 06:12 PM
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I run my car at 38-39ish with no problems and my car's pretty stock; check the sig. With your combo you should definitly be running mid 12's at least.. Up the fuel pressure and good luck.

Tremec 3550, Spec stage 2,Alm. Driveshaft, SteedaTri-Ax, 3.73's,65mmTB, adjustable FPR, BBK long tubes, BBK h-pipe w/o cats, Edelbrock exhaust,e-fan, 50/50 and 70/30 lakewoods, LCA's, Eibach drag launch,GT40upper/lower, GT40 heads, 1.7 RR's, 75mm Mass-Air, 24lb's.263hp 306ft/lb
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post #6 of 26 Old 07-29-2008, 06:40 PM
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On my old combo (302, E-Cam, 24#'s, A9P, No tune) I ran 39#. AFR was 15 at idle and 12.9 through the lights. The car ran low 12.80's

Romans 12:2 , 86 GT Bracket Car, 347 carbed/Vic jr's/Parker/ProSys 780/C-4,10.63 @ 125 bullets & Slicks, My dyno is 1320 ft. long.
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post #7 of 26 Old 07-29-2008, 10:37 PM
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damn i have a 255 fuel pump and 24lbs inj. and if a were to run 38-39 of fuel psi. my car would feel weak. i would have to run the pressure up to 50psi with the vacuum line disconnected just so i could get 43-44 psi

real worriors are driven everyday not just on weekends!
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post #8 of 26 Old 07-29-2008, 10:47 PM Thread Starter
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damn i have a 255 fuel pump and 24lbs inj. and if a were to run 38-39 of fuel psi. my car would feel weak. i would have to run the pressure up to 50psi with the vacuum line disconnected just so i could get 43-44 psi
i believe everyone is talking about with the vac line disconnected ! i hope ?

93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #9 of 26 Old 07-30-2008, 04:01 PM
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That is the right way to adjust your fuel pressure right?? Adjust it with the vac line disconnected then reconnect it and the fuel pressure should drop a bit. Mine dropped like 1 that's it.

Tremec 3550, Spec stage 2,Alm. Driveshaft, SteedaTri-Ax, 3.73's,65mmTB, adjustable FPR, BBK long tubes, BBK h-pipe w/o cats, Edelbrock exhaust,e-fan, 50/50 and 70/30 lakewoods, LCA's, Eibach drag launch,GT40upper/lower, GT40 heads, 1.7 RR's, 75mm Mass-Air, 24lb's.263hp 306ft/lb
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post #10 of 26 Old 07-30-2008, 05:52 PM Thread Starter
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That is the right way to adjust your fuel pressure right?? Adjust it with the vac line disconnected then reconnect it and the fuel pressure should drop a bit. Mine dropped like 1 that's it.
You have a bad regulator !


93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #11 of 26 Old 07-31-2008, 02:30 PM Thread Starter
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damn i have a 255 fuel pump and 24lbs inj. and if a were to run 38-39 of fuel psi. my car would feel weak. i would have to run the pressure up to 50psi with the vacuum line disconnected just so i could get 43-44 psi
so you are running 50 with the vac line off and 43-44 with it on ?

93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #12 of 26 Old 07-31-2008, 03:59 PM
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Quote:
Originally Posted by boostjunkie View Post
You have a bad regulator !
Can you tell me how?

Tremec 3550, Spec stage 2,Alm. Driveshaft, SteedaTri-Ax, 3.73's,65mmTB, adjustable FPR, BBK long tubes, BBK h-pipe w/o cats, Edelbrock exhaust,e-fan, 50/50 and 70/30 lakewoods, LCA's, Eibach drag launch,GT40upper/lower, GT40 heads, 1.7 RR's, 75mm Mass-Air, 24lb's.263hp 306ft/lb
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post #13 of 26 Old 07-31-2008, 04:08 PM Thread Starter
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That is the right way to adjust your fuel pressure right?? Adjust it with the vac line disconnected then reconnect it and the fuel pressure should drop a bit. Mine dropped like 1 that's it.
if your fuel pressure isn't dropping more than 1 psi when you reconnect vac to your fpr then its bad ! it should lower it about 6-8 psi maybe more maybe less but definatly more than 1 psi !

93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #14 of 26 Old 07-31-2008, 06:03 PM
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LoL OK !

Thanks for the info. How would I know if it's affecting me performance wise?? Would the car kind of sputter or lag at WOT?? It does that like once a month or so for like half a second then doesn't do it again for about another month lol no clue what it could be.

Tremec 3550, Spec stage 2,Alm. Driveshaft, SteedaTri-Ax, 3.73's,65mmTB, adjustable FPR, BBK long tubes, BBK h-pipe w/o cats, Edelbrock exhaust,e-fan, 50/50 and 70/30 lakewoods, LCA's, Eibach drag launch,GT40upper/lower, GT40 heads, 1.7 RR's, 75mm Mass-Air, 24lb's.263hp 306ft/lb
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post #15 of 26 Old 07-31-2008, 06:47 PM
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Originally Posted by boostjunkie View Post
so you are running 50 with the vac line off and 43-44 with it on ?
yes

real worriors are driven everyday not just on weekends!
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post #16 of 26 Old 08-02-2008, 12:11 AM
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i ran 30-32 na and 38-42 on the jug... 24's 190lph and stock lines and rails.... on the bottle the plugs read just a touch rich...

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post #17 of 26 Old 08-02-2008, 12:22 AM Thread Starter
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i ran 30-32 na and 38-42 on the jug... 24's 190lph and stock lines and rails.... on the bottle the plugs read just a touch rich...
is that with the vac off or on !

93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #18 of 26 Old 08-02-2008, 12:32 AM
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Do people STILL think changing fuel pressure will do anything?

unless you have disabled the adaptive strategy you are wasting your time.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #19 of 26 Old 08-02-2008, 12:40 AM Thread Starter
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Do people STILL think changing fuel pressure will do anything?

unless you have disabled the adaptive strategy you are wasting your time.
yeah it does but it will adapt to a point ! and changing the psi mainly effects wide open performance. because then the ecu can't adapt because the o2's quit reading. my car has a surge at idle and the only way to get it to go away is to lower my psi and clock my c&l meter, which is probobly caused by bad o2's ! but changing fuel pressure does help......

93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #20 of 26 Old 08-02-2008, 01:12 AM
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sorry.......all closed loop fuel trims are used to determine open loop (WOT) pulse widths.

And if you adjust past adaptive you better have a wide band or you really won't know what you have done.

And if you have a wide band, why wouldn't you have a tuner and do it right.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #21 of 26 Old 08-02-2008, 01:28 AM
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Originally Posted by boostjunkie View Post
is that with the vac off or on !
yeah...

and as far as the tuning with the fuel pressure goes... i'd imagine its a little differen't when dealing with a bottle fed car... wet kit... that little fuel jet will flow differently with differnt fuel pressure and volume thrown at it.

1991 coupe
stock bottom end, c4, nitrous,
1.43 [email protected] [email protected] revlimiter at 8.4
X275 BBFN2O 1>2 [email protected]
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post #22 of 26 Old 08-04-2008, 12:38 PM Thread Starter
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well i installed a fuel gauge on my fuel rail to verify the fuel pressure and to install my nitrous kit, well i started my car and noticed that i only had 32 psi with the vac off but i had previously checked it with a tire gauge and set it to 39 ! well long story short you can check your fuel psi with a tire gauge just make sure its a good one not a 3-4.00 dollor one ! i turned the psi up to 39-40 and it runs awsome now and the surging is almost gone.... still could be the 02's !

93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #23 of 26 Old 08-04-2008, 01:15 PM
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c&l like to surge

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #24 of 26 Old 08-04-2008, 02:12 PM Thread Starter
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i guess i got one of the funny ones, i have alot of friends that don't have any problems ! i did have to clock the mas to get it from surging when i first installed it. iguess i'll try to readjust my idle again. it only surges when i give it gas then back out of the throttle or when i start the car, it acts like it can't catch itself from dieing !

93 hatch midnight blue 2710lbs 2890 with me
302 flipped stock trw's ,typhoon intake,70mm tb,gt40pheads,crane beehives,bbk lt,x-pipe,1chambers,safc,24lb inj,255 pump,76mm C&L,f-cam,4.30,t-5,king cobra clutch
best 1/4 time: 12.68 best 1/4 mph: 108.18
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post #25 of 26 Old 08-04-2008, 04:38 PM
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Typical issues from a C&L. Get a real MAF.

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93 GT- Traded
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post #26 of 26 Old 08-05-2008, 04:36 PM
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never had a problem out of my c&l.....

1991 coupe
stock bottom end, c4, nitrous,
1.43 [email protected] [email protected] revlimiter at 8.4
X275 BBFN2O 1>2 [email protected]
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