Im Running 18-20psi on stock gap with Ac-delco plugs!!!!

Matt, run the biggest gap you can without missing.

The only really good way I can think of to do this is to increase the gap until your trap speeds start to drop, then come back .002 or so from there.

You need to be at an uncrowded track on test and tune day, with enough time between runs that heat soak doesn't throw the results off.

I had minor missing on the dyno w/NGK6097's @ .036, the car popped once or twice on each of the first 2 pulls, above 6k rpm's. On the final pull I had no misses at all. I figure .034 would be a safe gap, since the car is under more load on the street in 4th than on the dyno.

I was running 19 psi, and 100 Octane unleaded.

new coil pack is the way to go. I had mine installed 2 month ago and I absolutely loved it! however, you will still need to run a colder degree plug ranged #7. with stock plug and stock gap, my car ran way too hot even though its not missing at top end. if I were you I would get those NGK platinum or Denso Iradium with stock gap and 1 degree colder plugs just to keep the temp down.
BTW, I noticed at least 40C lower on EGT reading with #7 heat range than with stock #6 heat range during a long hard top end pull.

Ok, i will try colder plugs but the gap is working great. I just layed waste to a bike on the freeway.

Stop worrying about the plugs and be concerned about getting rid of those nasty wheels. At least get some stock ones....

I didn’t get them because other people like them. Great price used and 9” front 10” rear.
What’s with the selling the Supras and keeping the Porsche all about??

blackbird said:

I didn’t get them because other people like them. Great price used and 9” front 10” rear.
What’s with the selling the Supras and keeping the Porsche all about??

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I was just messin with you Bud. I sold the Supras since I made a lot of money on them. I kept the Porsche because I like doing road race events and the Supra is not that great at it. I might be buying another Supra soon or an SC400.

Lagtime said:

Matt, run the biggest gap you can without missing.

The only really good way I can think of to do this is to increase the gap until your trap speeds start to drop, then come back .002 or so from there.

You need to be at an uncrowded track on test and tune day, with enough time between runs that heat soak doesn't throw the results off.

I had minor missing on the dyno w/NGK6097's @ .036, the car popped once or twice on each of the first 2 pulls, above 6k rpm's. On the final pull I had no misses at all. I figure .034 would be a safe gap, since the car is under more load on the street in 4th than on the dyno.

I was running 19 psi, and 100 Octane unleaded.

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Did you actually find this to help power? Or are you just guessing? I know its supposed to, but I have yet to hear anyone mention a noticable increase from plug gap.

Grant said:

Did you actually find this to help power? Or are you just guessing? I know its supposed to, but I have yet to hear anyone mention a noticable increase from plug gap.

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I notice the car idling smoother, with better part throttle response at .036, but I gained less than 1 mph (~.6) average over 6 runs at the strip, compared to 6 runs the week previous week with the gap at .030. Weather/barometer was close to identical.

What you really end up doing is finding out how big you can go without *hurting* trap speed, I agree you won't find big increases.

I wouldnt go any bigger then stock gap.

SupraDawg said:

I was just messin with you Bud. I sold the Supras since I made a lot of money on them. I kept the Porsche because I like doing road race events and the Supra is not that great at it. I might be buying another Supra soon or an SC400.

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I loved the red one. Sorry to hear that it sold.

I don't think those 5-stars on either of Supdawg's cars look that fantastic and that blue on the porsche is definitely a sissy color!

Just thought I'd even the score there a little... It's all in good fun