I have an 86 Trans Am with the TPI 305 in it, I have brand new 8mm plug wires in it, and a complete set of Accel U-groove plugs for it. Stock gap is .045, I have these gapped to .054, with the bigger/hotter spark will I notice and throttle response, horsepower, or torque out of my 305.

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1986 Trans Am, T-Top, 305 TPI, Flowmaster 80 series. Much more to come in July.
[*]Sound System: Dual 12" Ground Zero Nuclear Series 900 watt RMS subs in custom box made to fit the rear well, Only 500 watts running them though, Pioneer Head Unit and Rockford Fosgate wiring.


AOL screen name= madbiker1

 

well, i just posted asimilar q's on this forum and to answer your question i do know on a stock coil you need to keep the gap at about 0.35 to get the most out of the car's ignition and performance. i know witha hotter coil you need to set it wider but, not sure how wide. but just keep the gaps at least 0.40-0.45 gap thats max on a stock coil.

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 160 (882) heads,.447/.447 lift 222@.050 duration speed pro 327/350hp cam 350 .40 over (356) edlebrock performer rpm intake and a 600 edlebrock manual choke (1405) Proform H.O. distributor slightly revised 700r-4

Future mods comp extreme energy roller cam, world products sportsman 2 heads, msd 6al ignition, billet distributor, blaster 2 coil and a 406 engine is in the works soon!!!!

 

with stock parts you'll weaken the spark as you increse the gap. you would increase the gap as you increase the igniton parts strength, as in a after market coil, wires to carry to load ,distributor. i said it in simple terms but you get the idea.

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ICON Motorsports

1st & 3rd

 

If the ignition module and coil have been changed to the 'updated' versions, the plug gap is actually .035 stock. With just new wires and plugs, I wouldnt run more than that, the stock ignition really is kinda weak.

 

Just to clarify, according to Chilton's manual for thirdgens, the stock plug gap on 82-86 V8's is 0.045 and the gap on 87-92 V8's is 0.035. I know this thread is old, but this is an issue I've seen come up quite often on this board.

 

Well since you are replying to an old thread, I'll correct you.

The early GM module setups that called for a .045 gap you cannot buy anymore. They have been replaced with an 'updated' version and are recommended to be set at .035 gap. This happened in around 1992.

 

wow you guys are replying to old threads, this is from when I had my base model 86 firebird....

this car is why I am 86FyrBrd and not something that says T/A or Trans Am or something.

 

wow maybe not I just read my sig from then, I swear I posted this when I had the old one



so did any of you guys believe me when I said "Much more to come in July" in my old signiture?

 

Who said anything about buying new modules?

 

Most have been replaced already. Quite a few of the cars that went to the dealer with ignition problems had the old module swapped out by the dealer, apparently GM felt there was a problem with the 'old' module that was designed to run the .045 gap.

 

So how would someone that isn't the original owner of the car be able to tell whether or not their module is original? Does it have a different part number printed on it or some other distinguishing characteristic?