gburke1

I recently pulled 4 of the plugs in my car (all passenger side) and found that they were not gapped properly... one at .025, one at .032, two at what seems to be .033 or .034.

Just wondering, after this is corrected will retuning be required or will my current dyno tune be ok?

Blacksmoke

Are you kidding or is this a serious question?
Hehehehe.
With all those mods I thought you would know about the car more.

Just in case this is serious, no... you do not need to re-tune it.

Say plugs required a tune.... you would still not need to because it was the PLUGS that had the mistake,
not the tune. Your car would be running on the tune for the correct gap. Understand the logic?

gburke1

I was just wondering because at the time when the car was being tuned, the spark plug gaps were already off... so my thinking was that if the spark plug gaps were off when they did the tune... wouldn't that lower the accuracy of the tune?

I am definitely a n00b though :P

Been fortunate enough to throw some money at the car and learning more every day. I would love to open a shop eventually but I also have many other dreams and unfortunately at the same time have to make money... which means most of the time I spend running my business

Blacksmoke

I have not heard of a re gap requiring a tune.
Tuning actually usually is needed when changing the air flow somehow, etc.

gburke1

This might seem a little bit ridiculous but I just want to make absolute sure lol.

So you're saying that even though the spark gap was wrong when they had the car on the dyno being tuned (I've read having the gap too small can leave unburnt fuel and cause power losses among other things, and having it too much can cause spark blowout), this would not effect the accuracy/correctness of the tuning in any way?

BTW Thanks for your help! I think I am getting close to getting the car sorted out & this info will be a great help when I go in to the shop again

Blacksmoke

Well the timing could change on firing etc.
I misunderstood you. I thought you had a canned tune from somewhere and the tune would have been set for the correct timing.
But if it was actually on the dyno and had the wrong gap in there it sure could be a different story.

So you might want to call them about that.

grabber blue gt

Yeah I would call your tuner and see what they say. I see what you are saying, cause if your plugs were all messed up and out of order at the time of your dyno tune, it may have thrown things off and messed with the final accuracy of the tune.

gburke1

Thanks, yeah I thought it seemed a little odd that it would not effect the tune (since they were present and incorrectly gapped while the tune was being done on the dyno...)

They told me HP was down about 100 from where I originally had dynoed at... (so somewhere in the 340-360 rwhp~ish range...) which would make sense why my MPH was only 108.91 in the quarter. That MPH seems right below the 5.0 which would be at around 350-370 rwhp and have a little less weight.

Sounds like they owe me some new spark plugs if they aren't fixable (since I paid for them to replace the old ones...) and a re-tune. I wish spark plugs were cheap so I could try a pair at .035 and another at .032 ... seems from what I read, for max power you want to run the biggest gap possible without any spark blowout

I can't wait to see what the car will do after this is fixed! Glad I took the time to pull the plugs & figure this out... because the shop so far has mostly been acting like there is nothing wrong at all.

Nuke

I adjust my tune when I go from boxers to tighty whities.