quick fuel system question
 

I have an 89 with 10 psi, and i just started installing a new cam, home ported heads, and a new intake manifold... here is the current fuel system

24# injectors
Stock intank /w cartech inline pump
53 psi fuel pressure

This worked fine when the long block was stock, but with the extra power of the heads/cam/intake and the fact that im going to be pushing to 6000 rpm's on the track now.

[This message has been edited by clearwaterms (edited 04-05-2001).]

Well buddy..whats your question??

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347 Stroker Motor: Balanced, A9P Computer, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley Fuel Regulator, March Underdrive Pulleys, Electric Fan, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 79mm Mass Air Unit, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, High Tolerant Painted Cal

Im sorry, which part's do i need to upgrade?

Well..First thing I would do is replace that stock fuel pump. Put a 190 in there. See how that does with the 24# injectors. Then bump up your fuel pressure a bit. Do you know how much hp you are putting out??

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347 Stroker Motor: Balanced, A9P Computer, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley Fuel Regulator, March Underdrive Pulleys, Electric Fan, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 79mm Mass Air Unit, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, High Tolerant Painted Cal

when everything is done, im probably going to have it dyno tuned, and we are guessing, like 340~350 fly and with the mods we are hoping for 370~380 crank or 315 at the wheels. I have been told that this combo tuned will make 400 horsepower flywheel, as i guy did it except that the only difference was that it was GT40 heads, untouched verse my home ported E7te heads, he made 382 rear wheels.

53 PSI is WAY to high of a base for f/p...what are you running for a blower??? An FMU??? Boost retard???

A little more help here please

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1992 LX:V-1 S-Trim ,Edelbrock 6037 Heads,Cobra Intake,E-303,1.6 Rollers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP,24 lb injectors,MSD 6A and BTM,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers,Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors,Ponies w/ 225/50 Nitto NT 450's on front,255/50 BFG Drags out back,93 Cobra Spoiler
Daily driver 89 Coupe:BBK shorties,offroad,flowturds with dumps,soon to be cyber green

I think we need a little more technical information in order to give you better responses, but based on what you've provided:

1) With 10 psi and ported heads, intake, exhaust, etc, I would say you should upgrade injectors to 30 or 36's.

2) Definately upgrade the pump - 255 or 190lph.

3) Are you running an FMU? At 10 psi you should consider it.

With more details we can provide more useful info.

Take it easy,
E

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1991 5.0 LX Coupe - 38,000 miles

13.17 @ 106.14 mph w/ 2.138 60'

yes i am running an FMU. the fuel pressure is at idle with the vacuum line connected, it seemed to work pretty well. It's an A trim at 10 psi and the motor sees 8. Yes i am going to upgrade to a 255 intank. The timing is set at 9 deg. base and run without a BTM box, it seems to work better, then when i hooked up the BTM box. Somebody recommended going to 42 lbs. injectors and losing the FMU?

Yeah, you could lose the FMU and go with 42#'s but if you do, you may want to consider a custom dyno-tuned chip in order to sort out the fuel situation under boost. Or, just go with a Speed-Pro ignition ($$$). http://www.mustangworks.com/msgboard/biggrin.gif

For now, I would keep the FMU on and keep the timing out of the motor (8 or 9 is probably as high as you want).

With ported heads and intake you should notice a difference - keep us posted on the results.

E

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1991 5.0 LX Coupe - 38,000 miles

13.17 @ 106.14 mph w/ 2.138 60'