quick fuel system question

clearwaterms · 04-05-2001, 12:31 PM

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).]

Smokedawg · 04-05-2001, 12:35 PM

Well buddy..whats your question??

------------------
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

Smokedawg · 04-05-2001, 12:37 PM

Quote:

Originally posted by Smokedawg:
Well buddy..whats your question?? Do you just want to know what fuel setup you need to be running now?

clearwaterms · 04-05-2001, 12:39 PM

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

Smokedawg · 04-05-2001, 12:40 PM

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??

------------------
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

clearwaterms · 04-05-2001, 03:03 PM

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.

Green92LX · 04-05-2001, 03:12 PM

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

------------------
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

302 LX Eric · 04-06-2001, 09:30 AM

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

------------------
1991 5.0 LX Coupe - 38,000 miles

13.17 @ 106.14 mph w/ 2.138 60'

clearwaterms · 04-06-2001, 09:46 AM

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?

302 LX Eric · 04-06-2001, 12:19 PM

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 ($$$).

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

------------------
1991 5.0 LX Coupe - 38,000 miles

13.17 @ 106.14 mph w/ 2.138 60'

04-05-2001, 12:31 PM	#1
clearwaterms Registered Member Join Date: Jun 1999 Location: Westchester, IL, USA Posts: 171	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).]

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04-05-2001, 12:35 PM	#2
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	Well buddy..whats your question?? ------------------ 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

04-05-2001, 12:39 PM	#4
clearwaterms Registered Member Join Date: Jun 1999 Location: Westchester, IL, USA Posts: 171	Im sorry, which part's do i need to upgrade?

04-05-2001, 12:40 PM	#5
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	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?? ------------------ 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

04-05-2001, 03:03 PM	#6
clearwaterms Registered Member Join Date: Jun 1999 Location: Westchester, IL, USA Posts: 171	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.

04-05-2001, 03:12 PM	#7
Green92LX Registered Member Join Date: Jun 1999 Location: North Haven,CT Posts: 336	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 ------------------ 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

04-06-2001, 09:30 AM	#8
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	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 ------------------ 1991 5.0 LX Coupe - 38,000 miles 13.17 @ 106.14 mph w/ 2.138 60'

04-06-2001, 09:46 AM	#9
clearwaterms Registered Member Join Date: Jun 1999 Location: Westchester, IL, USA Posts: 171	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?

04-06-2001, 12:19 PM	#10
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	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 ($$$). 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 ------------------ 1991 5.0 LX Coupe - 38,000 miles 13.17 @ 106.14 mph w/ 2.138 60'