Slant 6 Music
Well-Known Member
71 GTX. 440+6. Stock build. Total Street car. No track for it.
When I run the timing light, I get fluctuations of 5 or more degrees in both directions, non stop strobing the time plate. RPM's on digital readout move up and down a little, but not bad. 50 or so.
Initial is around 13 and total about 29, maybe 30. I say around, because I have to estimate the middle of the strobe going up and down on the timing plate.
Engine idles smoothly and there is good power when the outboards kick in. Been able to run on pump gas 92 and dial in vac advance without pinging.
ECU. Orange box (older made in Mexico). Swapped in a Chrome box made in USA, no difference in timing readings.
Disti. Same era stock style electronic. Added a Limiter plate. Had a very knowledgeable and experienced mopar mechanic go through it and he thought it was in good operating condition.
Innova Digital Timing Light. Compared against 2 other lights, all the same results.
Talking to the folks at 4 Seconds Flat (FBO), she mentioned that the ECU box can definitely cause the timing to retard and bounce back and forth. Said that their product is digital, better, etc. But before I throw money at it, I want to make sure I'm going in the right direction.
Any comments or suggestions appreciated. Thanks in advance!
When I run the timing light, I get fluctuations of 5 or more degrees in both directions, non stop strobing the time plate. RPM's on digital readout move up and down a little, but not bad. 50 or so.
Initial is around 13 and total about 29, maybe 30. I say around, because I have to estimate the middle of the strobe going up and down on the timing plate.
Engine idles smoothly and there is good power when the outboards kick in. Been able to run on pump gas 92 and dial in vac advance without pinging.
ECU. Orange box (older made in Mexico). Swapped in a Chrome box made in USA, no difference in timing readings.
Disti. Same era stock style electronic. Added a Limiter plate. Had a very knowledgeable and experienced mopar mechanic go through it and he thought it was in good operating condition.
Innova Digital Timing Light. Compared against 2 other lights, all the same results.
Talking to the folks at 4 Seconds Flat (FBO), she mentioned that the ECU box can definitely cause the timing to retard and bounce back and forth. Said that their product is digital, better, etc. But before I throw money at it, I want to make sure I'm going in the right direction.
Any comments or suggestions appreciated. Thanks in advance!
