finding ideal fuel pressure

avbcon12 · 06-06-2002, 07:53 PM

how can i do it (without a dyno tune)? im trying to find the ideal fuel pressure for my mustang. this is what i have so far:
i have it set at 39 (vacuum off). and the plugs are a nice golden brown. although, my car is having a hard time starting when hot and the oil smells like gas.
im not getting any smoke out of the exhaust or anything.

thank you,
adam

Mach 1 · 06-07-2002, 01:22 AM

Take it to the track and make some passes with different pressures

avbcon12 · 06-07-2002, 10:55 AM

anybody else?
i would rather do it in my driveway.

thanks,
adam

Mach 1 · 06-07-2002, 11:44 AM

wouldnt we all....

avbcon12 · 06-07-2002, 01:12 PM

theres got to be some way to do it to a point where its within reason. i dont even know if im there....

give some suggestions at least....

thanks,
adam

jimberg · 06-07-2002, 01:30 PM

Sorry, it just doesn't work that way. It's not even as easy as Mach 1 suggested. The only way to really do it right is to take it to a dyno with a wideband O2 sensor, figure out what the optimal air/fuel ratio is and then have a chip made. I'm working on a longer description about why this is so and I will post it later when I get the time.

avbcon12 · 06-07-2002, 02:08 PM

thanks a lot!

i just want to get it to a point where im not going to wash down the cylinder walls and contaminate my oil (my oil smells like gas). like a "safe" range...

thanks,
adam

Stang Runner · 06-07-2002, 05:16 PM

I did a self tune out in the middle of Now where on the street took the G-tech and took it up to 60mph and I got a 0-60 Did it at diff fuel pressure and I got it ruuing good
on the dyno they got about 10 more HP But I did ot good on my Owen doing it that Way YOU MUST drive it hard to find out Ithere Dyno Track or Out in the middle of no where.

avbcon12 · 06-07-2002, 05:28 PM

ok thanks guys...

do you think because my oil smells like gas i am rich? but on the other hand my plugs look perfect and im not getting any smoke...

thanks,
adam

jimberg · 06-07-2002, 08:42 PM

Make sure that you don't have a faulty FPR. It's possible for fuel to be sucked into the intake via the vacuum port. Also, make sure that your PCV valve is working correctly. Both of these things can cause a hard start problem.

avbcon12 · 06-07-2002, 10:51 PM

well i know my FPR doesnt leak any, but the PCV is interesting...

right now i have the PCV hooked up like normal, but the tube that goes to the TB from the valve cover is no longer there. i have a breather on the valve cover. the reason i did this id because i have a TB from an explorer (no provision for that tube). so i just stuck a breather on the valve cover.

what should i try first to fix this IF its the problem...?

thanks,
adam

06-06-2002, 07:53 PM	#1
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	finding ideal fuel pressure how can i do it (without a dyno tune)? im trying to find the ideal fuel pressure for my mustang. this is what i have so far: i have it set at 39 (vacuum off). and the plugs are a nice golden brown. although, my car is having a hard time starting when hot and the oil smells like gas. im not getting any smoke out of the exhaust or anything. thank you, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

06-07-2002, 01:22 AM	#2
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Take it to the track and make some passes with different pressures __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

06-07-2002, 10:55 AM	#3
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	anybody else? i would rather do it in my driveway. thanks, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

06-07-2002, 11:44 AM	#4
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	wouldnt we all.... __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

06-07-2002, 01:12 PM	#5
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	theres got to be some way to do it to a point where its within reason. i dont even know if im there.... give some suggestions at least.... thanks, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

06-07-2002, 01:30 PM	#6
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Sorry, it just doesn't work that way. It's not even as easy as Mach 1 suggested. The only way to really do it right is to take it to a dyno with a wideband O2 sensor, figure out what the optimal air/fuel ratio is and then have a chip made. I'm working on a longer description about why this is so and I will post it later when I get the time. __________________ 351W 89 Mustang GT Convertible

06-07-2002, 02:08 PM	#7
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	thanks a lot! i just want to get it to a point where im not going to wash down the cylinder walls and contaminate my oil (my oil smells like gas). like a "safe" range... thanks, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

06-07-2002, 05:16 PM	#8
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	I did a self tune out in the middle of Now where on the street took the G-tech and took it up to 60mph and I got a 0-60 Did it at diff fuel pressure and I got it ruuing good on the dyno they got about 10 more HP But I did ot good on my Owen doing it that Way YOU MUST drive it hard to find out Ithere Dyno Track or Out in the middle of no where. __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

06-07-2002, 05:28 PM	#9
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	ok thanks guys... do you think because my oil smells like gas i am rich? but on the other hand my plugs look perfect and im not getting any smoke... thanks, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

06-07-2002, 08:42 PM	#10
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Make sure that you don't have a faulty FPR. It's possible for fuel to be sucked into the intake via the vacuum port. Also, make sure that your PCV valve is working correctly. Both of these things can cause a hard start problem. __________________ 351W 89 Mustang GT Convertible

06-07-2002, 10:51 PM	#11
avbcon12 Registered Member Join Date: Jul 2001 Location: West Bloomfield, MI Posts: 391	well i know my FPR doesnt leak any, but the PCV is interesting... right now i have the PCV hooked up like normal, but the tube that goes to the TB from the valve cover is no longer there. i have a breather on the valve cover. the reason i did this id because i have a TB from an explorer (no provision for that tube). so i just stuck a breather on the valve cover. what should i try first to fix this IF its the problem...? thanks, adam __________________ 90 GT black/ grey leather ported GT-40 heads w/ 1.7RR, Cobra intake w/ ported lower, 24# injectors, 190LPH pump, 75mm Pro-M MAF, 65mm TB, K&N panel, BBK long tubes, Off road H-pipe, 2 ch. Flowmaster, Black magic fan, Kirban FPR, 180 deg. T-stat, 3.73's, Steeda Tri-Ax, 130 amp alt. Accell 8.8 race wires/cap/rotor, motorcraft plugs, Factory Five suspension, etc etc etc.... http://avbcon12.stangnet.com

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