What are the limits of the stock ignition system?
What are the limits of the stock ignition system? *Update* Plugs are fouled I'm trying to find out if the cause of the miss and my tuner and the owner of the shop I got tuned at thinks the stock lt1 ignition isn't up to the task since it's worse at peak torque. The car doesn't miss at part throttle at those RPM's it only misses at full throttle so it makes sense to me. But I want to know what the problem is instead of just throwing $$ at it and hoping I fix the problem. I'm running TR6's gapped @ .038 if that matters. The car also ran fine before I took it apart with my old heads/cam setup so I don't think anything in the ignition system is bad. My cap/rotor only have ~1000 miles on it and it looked brand new inside when I took it apart. Here's the dynograph incase you haven't seen it.
Last edited by speed_demon24; Dec 31, 2007 at 03:46 PM.
I might try a different coil and consider checking and maybe adding a ground to the motor. My car ran just fine with a stock ingnition last year and early this year I added an Accel box really only for the rev limiter and noticed no change in the way the car ran. I am running TR6s gapped at .045 too.
That fails maybe try a different ICM.
That fails maybe try a different ICM.
I might try a different coil and consider checking and maybe adding a ground to the motor. My car ran just fine with a stock ingnition last year and early this year I added an Accel box really only for the rev limiter and noticed no change in the way the car ran. I am running TR6s gapped at .045 too.
That fails maybe try a different ICM.
That fails maybe try a different ICM.
ICM's usually work or not. I would try the additional or check grounds, and ohm out the wires to see what condition they're in. I've seen stock ignition systems support over 420rwhp no problem in the past.
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We have run the stock ignition up to 500rwhp on LT1's,I would check the plug wires real good,possible even try another set of plugs,i have had some that were bad out of the box.
Well I think I figured out what was causing my miss. I pulled out a plug and it looks fouled. It has ~200 miles on it and it was missing on the dyno so I'm guessing it was like that then too. I had a set of TR55's that looked exactly the same as this awhile ago and changing them out fixed the problem. I'm running Tr6's now. What would cause them to foul like this? And does anyone have any different plug reccomendations or any advice on stopping them from doing this?
I'll also add a ground for the hell of it. Where would be a good spot to add one?
I'll also add a ground for the hell of it. Where would be a good spot to add one?
I was thinking that was the problem from reading the rest of the thread. You are either now are at least where before the dyno tune running rich either while idling or while driving. Not only will this foul plugs it will let extra gas down into the oil and cause damage. Pull the dipstick and see if it smells like oil or more like gas and is runny looking. I would put all new plugs in it right before putting it on the dyno and make a few runs and also let it sit and idle and see if it is still running rich.
A fouled plug will first start to show up under full throttle in higher gears as that is when it has the most pressure on it to perform.
A fouled plug will first start to show up under full throttle in higher gears as that is when it has the most pressure on it to perform.
I'm guessing a bad 02 sensor might cause this? When I started up my car it had ~7 month old gas in it and it also had a bad 02 sensor. I also swapped it to the other side to confirmed it was a bad 02. Hopefully just changing the plugs fixes the problem. The tune really wasn't that far off too it was ~13.0-12.7 a/f on the old tune. Is there anything else you can see in the plug, correct heat range, gap, ect?
Update... Changed the plugs and they didn't help it at all. The car runs perfect at part throttle and cruising. There is no popping or missing and it also doesn't miss at any RPM at part throttle. I took it up to 6K at 50% throttle and it never missed a beat. I guess I'll try an ignition box next.