what does it take to burn my stinking tires!!!!!!!!!!!!!!!
05-12-2015, 09:10 AM
#21
Instructor
Thread Starter
One other thing the instruction mannual for the MSD 6AL ignition box states to NOT use a digital timing light or dial back timing light. Has anyone timed theirs with this mod and if so what did you use. Thanks
05-12-2015, 09:27 AM
#24
Race Director
Member Since: Feb 2002
Location: Compound in the Grove, Ga.
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2020 C3 of the Year Finalist - Unmodified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
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St. Jude Donor '16
2020 C3 of the Year Finalist - Unmodified
05-12-2015, 10:53 AM
#25
Safety Car
1990 rebuilt motor and trans (yes auto), 355, head work, cam, open air box with KN, ported plenum, 52mm throttle body, edelbrock high flow runners and intake, 24 lb injectors and high flow fuel pump, new tune up parts ( sensors, plugs, distributor cap/rotor 8.5mm MSD plugs, MSD coil, MSD 6al box) exotic muscle long tube headers & X pipe, no CATs, true dual exhaust, corsa CAT back 3:54 gear ratio and a supposed tune. No traction control on mine dont know if thatwas an option and brand new 295s on the rear. I dont want to destroy my tires but every once and again its fun to drive the car like a corvette!
05-12-2015, 12:02 PM
#27
Safety Car
You will need a tune to work with the mods and you may need a stall speed depending on the cam you have. (make sure to check the basics like fuel pressure and timing)
05-12-2015, 12:13 PM
#28
Melting Slicks
Strange I have the opposite problem. Mine spins like crazy if Im not careful. 383 with 3.73 gears and automatic.
The 86 coupe I had was 350 with 3.07's I think and manual trans and it was spin tires pretty easy too even before the supercharger.
As mentioned Id check the timing. Its makes all the difference in the world performance wise.
The 86 coupe I had was 350 with 3.07's I think and manual trans and it was spin tires pretty easy too even before the supercharger.
As mentioned Id check the timing. Its makes all the difference in the world performance wise.
05-12-2015, 06:51 PM
#31
Melting Slicks
Hi
Yes any C4 will easilly spin the tires, too easilly in fact.
Are you running a high stall converter? does it match your torque curve?
I know from past experience a high stall converter needs to be matched to the torque band, you can get a situation where it can bog down before your engine makes it best horsepower.
Does your transmission start with first gear? have you tried selecting first and hit the accellerator pedal.
Do not trust your harmonic ballancer timing marks, the outer ring can slip so your 6 before TDC may be retarded 20 degrees?
I usually just advance the distributor and when i can hear pinging i back it of a little so its on the sweet spot.
So in short at what RPM does the engine really start to make good power, a hot cam will need a stall converter to match where the power is good not too low not too high.
Is the TV cable adjusted correctly for full trans pressure at max throttle? Are you sure it is not slipping or the diff clutches worn. You will however know that is the case if the rpms go up with no forward motion.
Good luck.
Yes any C4 will easilly spin the tires, too easilly in fact.
Are you running a high stall converter? does it match your torque curve?
I know from past experience a high stall converter needs to be matched to the torque band, you can get a situation where it can bog down before your engine makes it best horsepower.
Does your transmission start with first gear? have you tried selecting first and hit the accellerator pedal.
Do not trust your harmonic ballancer timing marks, the outer ring can slip so your 6 before TDC may be retarded 20 degrees?
I usually just advance the distributor and when i can hear pinging i back it of a little so its on the sweet spot.
So in short at what RPM does the engine really start to make good power, a hot cam will need a stall converter to match where the power is good not too low not too high.
Is the TV cable adjusted correctly for full trans pressure at max throttle? Are you sure it is not slipping or the diff clutches worn. You will however know that is the case if the rpms go up with no forward motion.
Good luck.
Last edited by gerardvg; 05-12-2015 at 06:54 PM.
05-12-2015, 08:51 PM
#32
Instructor
Thread Starter
Hi
Yes any C4 will easilly spin the tires, too easilly in fact.
Are you running a high stall converter? does it match your torque curve?
I know from past experience a high stall converter needs to be matched to the torque band, you can get a situation where it can bog down before your engine makes it best horsepower.
Does your transmission start with first gear? have you tried selecting first and hit the accellerator pedal.
Do not trust your harmonic ballancer timing marks, the outer ring can slip so your 6 before TDC may be retarded 20 degrees?
I usually just advance the distributor and when i can hear pinging i back it of a little so its on the sweet spot.
So in short at what RPM does the engine really start to make good power, a hot cam will need a stall converter to match where the power is good not too low not too high.
Is the TV cable adjusted correctly for full trans pressure at max throttle? Are you sure it is not slipping or the diff clutches worn. You will however know that is the case if the rpms go up with no forward motion.
Good luck.
Yes any C4 will easilly spin the tires, too easilly in fact.
Are you running a high stall converter? does it match your torque curve?
I know from past experience a high stall converter needs to be matched to the torque band, you can get a situation where it can bog down before your engine makes it best horsepower.
Does your transmission start with first gear? have you tried selecting first and hit the accellerator pedal.
Do not trust your harmonic ballancer timing marks, the outer ring can slip so your 6 before TDC may be retarded 20 degrees?
I usually just advance the distributor and when i can hear pinging i back it of a little so its on the sweet spot.
So in short at what RPM does the engine really start to make good power, a hot cam will need a stall converter to match where the power is good not too low not too high.
Is the TV cable adjusted correctly for full trans pressure at max throttle? Are you sure it is not slipping or the diff clutches worn. You will however know that is the case if the rpms go up with no forward motion.
Good luck.
05-13-2015, 12:00 PM
#34
Melting Slicks
Member Since: Sep 2008
Location: Cherokee National Forest TN
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Plug the EST wire together the timing will automatically advance =
EST is working.
If you have any engine noise like solid roller lifters or noisy long tubes etc the knock sensors may be pulling timing out.
05-13-2015, 12:13 PM
#35
Instructor
Thread Starter
Disconnect the spark timing wire @ the brake booster its a single black weather-pack male/female connector, wire color is tan with a black stripe. Adjust initial timing, factory suggests 6* BTDC.
Plug the EST wire together the timing will automatically advance =
EST is working.
If you have any engine noise like solid roller lifters or noisy long tubes etc the knock sensors may be pulling timing out.
Plug the EST wire together the timing will automatically advance =
EST is working.
If you have any engine noise like solid roller lifters or noisy long tubes etc the knock sensors may be pulling timing out.
05-13-2015, 12:37 PM
#36
Instructor
Thread Starter
Rookie question so dont beat me up please, I have only timed the car once but seems I remember that when I pulled the throttle cable and the RPMs came up up the timing advanced itself and I could see it by the distrubitor physically move clockwise and then counter clock wise when I let of the throttle. Is this correct or could it have been because I had the distributor bolt loosened a touch to set timing.
05-13-2015, 01:46 PM
#37
To check for ign timing advancing leave the timing connector hooked up, hook up the light to #1 plug wire, point the timing light at the balancer & rev up the engine. The timing mark should move way off the scale. At idle the mark probably won't be on the scale anyways.
05-13-2015, 01:47 PM
#38
Rookie question so dont beat me up please, I have only timed the car once but seems I remember that when I pulled the throttle cable and the RPMs came up up the timing advanced itself and I could see it by the distrubitor physically move clockwise and then counter clock wise when I let of the throttle. Is this correct or could it have been because I had the distributor bolt loosened a touch to set timing.
05-13-2015, 03:05 PM
#39
Melting Slicks
It would be good to know which 295 tires you are using. 295/45R17 M/T ET Street Radial II? 295/35R17 track tires? 295/35R18 whatever tires? 295 not a very common size for a C4, but can work. What kind of attire?
Tall, wide, heavy, sticky tire and wheel combination?
Tall, wide, heavy, sticky tire and wheel combination?
05-13-2015, 03:57 PM
#40
Safety Car
1990 rebuilt motor and trans, 355, head work, cam, open air box with KN, ported plenum, 52mm throttle body, Edelbrock high flow runners and intake, 24 lb injectors and high flow fuel pump, new tune up parts ( sensors, plugs, distributor cap/rotor 8.5mm MSD plugs, MSD coil, MSD 6al box) Exotic Muscle long tube headers & X pipe, no CATs, true dual exhaust, Corsa CAT back 3:54 gear ratio.
