Hey I have a 1993 GT It has mostly bolt on modifications such as K&N cold air, flowtech shorty's, all 2 1/4 h pipe no cats, and 2 chambers, it has adjustable fuel pressure regulator, msd ignition, mallory coil, hypertech chip, underdrive pulley's on crank and water pump, A/C delete, smog delete, 3:73's, a King Cobra clutch and under hood fuel pressure gauge. THERE IS NOT A CAM IN THIS CAR in fact I don't think it has any motor work but don't know for sure I bought it almost exactly like it is now. It runs 8.99 - 9.20's at like 78 mph or so in the 8th.
Now to my questions??? My car used to idle weird when you first started it, it would go up and down. Idling between 600- 1000 rpm almost dying when it went to 600 rpm. This just occured when it was cold when it warmed up a little it smoothed out a little at idle. Also after it warmed up for 1-2 minutes a check engine light would come on, and when you punched it would sound like the top of the motor was coming apart (I think this was spark knok as this motor is not damaged). And it would feel really rough when you got into it i.e. vibration in the shifter from the motor. At first I thought this was do to leaking headers (can't ever keep these bolts tight) and So I put new aluminum gaskets on. That didn't fix the problem. So I checked the fuel pressure it was like 45 psi with the vacuum connected so I adjusted it to right at 35 psi with the vacuum off with the vacuum line on it sits about 28 psi at idle going up at WOT (wide open throttle) to 30-33 psi. The wierd thing is I took it for a drive the check engine light turned off, no more spark knock at full throttle, and no more roughness in the shifter when it's to the floor. I did mess with the initial timing when it was still messed up to get more power off the line. Now that's fixed it doesn't feel as strong as it did. (When it was cold it was fast when it was messed up and you punched it). Now for my question does anyone know if i could make it faster by adding or subtracting psi to the fuel, or could I add initial timing and make it faster. and does anyone have a suggestion for psi, and timing setting. I don't have a timing light so I'd be doing it by ear any info would be nice and appreciated. Also this motor has hyperutectic pistons (1993) so I can't run a power adder, what should I do to make the most power for the less buck any suggestions would also be appreciated. I don't wanna spend more than 400.00 but wan't a significant difference is this even possible. This is my first post sorry for the book Thanks Jody
Now to my questions??? My car used to idle weird when you first started it, it would go up and down. Idling between 600- 1000 rpm almost dying when it went to 600 rpm. This just occured when it was cold when it warmed up a little it smoothed out a little at idle. Also after it warmed up for 1-2 minutes a check engine light would come on, and when you punched it would sound like the top of the motor was coming apart (I think this was spark knok as this motor is not damaged). And it would feel really rough when you got into it i.e. vibration in the shifter from the motor. At first I thought this was do to leaking headers (can't ever keep these bolts tight) and So I put new aluminum gaskets on. That didn't fix the problem. So I checked the fuel pressure it was like 45 psi with the vacuum connected so I adjusted it to right at 35 psi with the vacuum off with the vacuum line on it sits about 28 psi at idle going up at WOT (wide open throttle) to 30-33 psi. The wierd thing is I took it for a drive the check engine light turned off, no more spark knock at full throttle, and no more roughness in the shifter when it's to the floor. I did mess with the initial timing when it was still messed up to get more power off the line. Now that's fixed it doesn't feel as strong as it did. (When it was cold it was fast when it was messed up and you punched it). Now for my question does anyone know if i could make it faster by adding or subtracting psi to the fuel, or could I add initial timing and make it faster. and does anyone have a suggestion for psi, and timing setting. I don't have a timing light so I'd be doing it by ear any info would be nice and appreciated. Also this motor has hyperutectic pistons (1993) so I can't run a power adder, what should I do to make the most power for the less buck any suggestions would also be appreciated. I don't wanna spend more than 400.00 but wan't a significant difference is this even possible. This is my first post sorry for the book Thanks Jody