Regap factory plugs. Go 3/10ths faster!

[Excelerater]

I pulled all my plugs out and sure as shit they were out of spec !
Driver side was about .048 and pass side was about .052

so i regapped them all using my feeler gauge to .045..


word of caution,those cheapo store brand gapping tools are all over the place
I had 3 and all 3 read different,def use a feeler gauge

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[bluebeastsrt]

Wait, so you ran 12.11 on stock tires with a tune and cai? That's moving son! I going check my plugs shortly.

Both slips posted in this thread were on 245\40\18 mickey thompson drag radials. I did match the 12.4 on street tires a few weeks ago.

 

[bluebeastsrt]

I pulled all my plugs out and sure as shit they were out of spec !
Driver side was about .048 and pass side was about .052

so i regapped them all using my feeler gauge to .045..


word of caution,those cheapo store brand gapping tools are all over the place
I had 3 and all 3 read different,def use a feeler gauge

For best results i uss a feeler guage and va]ing pliers.

 

[Cascadia_302]

Interesting, I haven't pulled my plugs yet to check the gaps so what brand of plugs are in the GT's? I also wonder what the plug manufacturer recommends for their plug gap min-max limits?

 

[Tommy V]

For best results i uss a feeler guage and va]ing pliers.

Yep i know u and i ran 12.4 on street tires,but i really think someone can get one of these into the 11,s on street tires.I have not been back since it really cooled down,so i might give it one more shot before going to a full drag radial or 10.5.Im going to pull my plugs tomorrow,but my mph has not been too bad,but u never know.I might just throw some e3,s in their.

 

[Sick03L]

I pulled all my plugs out and sure as shit they were out of spec !
Driver side was about .048 and pass side was about .052

so i regapped them all using my feeler gauge to .045..


word of caution,those cheapo store brand gapping tools are all over the place
I had 3 and all 3 read different,def use a feeler gauge

While I agree..... I've had the same el cheapo one for 15 years. I've gapped so many plugs that were used on nitrous and FI motors. I should probably at least see how accurate it is. Its been good to me this long lmao.

 

[stoli]

I highly doubt it was the plugs. The DA on the first run was around 722 and -1223 on the second run.

DA - 10/13: 722
Corrected time: 12.338 @ 113.229 MPH


DA 10/23: -1223
Corrected time: 12.266 @ 113.351 MPH

 

[bluebeastsrt]

I highly doubt it was the plugs. The DA on the first run was around 722 and -1223 on the second run.

DA - 10/13: 722
Corrected time: 12.338 @ 113.229 MPH


DA 10/23: -1223
Corrected time: 12.266 @ 113.351 MPH

Try it and see if your MPH goes up. ;)

 

[Mikeg4572]

I highly doubt it was the plugs. The DA on the first run was around 722 and -1223 on the second run.

DA - 10/13: 722
Corrected time: 12.338 @ 113.229 MPH


DA 10/23: -1223
Corrected time: 12.266 @ 113.351 MPH

I agree

 

[Todd15Fastback]

Interesting. Guess I'll check mine, too.

 

[stoli]

Try it and see if your MPH goes up. ;)

I'd love to try a coal mine DA at the track. I know just from earlier this week that a DA drop of 1000 resulted in my best track times ever, a drop of (drumroll), .3 and an mph increase of almost 3mph. Just check the leader board in the 1/4 mile thread.

You had a DA drop of 2000'. That's a huge difference and will greatly impact ET and traps.

My gaps were all within spec except two; I checked them when I swapped them for colder plugs months ago when I added nitrous, and again last week when I put them back after removing the spray.

 

[bluebeastsrt]

I'd love to try a coal mine DA at the track. I know just from earlier this week that a DA drop of 1000 resulted in my best track times ever, a drop of (drumroll), .3 and an mph increase of almost 3mph. Just check the leader board in the 1/4 mile thread.

You had a DA drop of 2000'. That's a huge difference and will greatly impact ET and traps.

My gaps were all within spec except two; I checked them when I swapped them for colder plugs months ago when I added nitrous, and again last week when I put them back after removing the spray.

You don't believe it. That's your prerogative. My car is a tenth slower than yours and you had a better sixty and a more powerful car assuming your longtubes are doing their job. Running in good air is sweet but it's not a magic silver bullet. Im just trying to help people out. Do a little research on the Coyote motors on different forums. The Gap thing seams to be a common problem.

 

[stoli]

You don't believe it. That's your prerogative. My car is a tenth slower than yours and you had a better sixty and a more powerful car assuming your longtubes are doing their job. Running in good air is sweet but it's not a magic silver bullet.

That's my exact point - my car should be faster based on power, but due to DA it isn't. Pop my numbers in a DA calculator and I'm even faster (11.893 @ 117.196 MPH). It's physics, not magic.

 

[Sick03L]

That's my exact point - my car should be faster based on power, but due to DA it isn't. Pop my numbers in a DA calculator and I'm even faster. It's physics, not magic.

Mic drop......

 

[bluebeastsrt]

Ok man your right. The car probably runs exactly the same if the gap is correct or not. Probably no science involved with that at all. Why do they even recommend gaps on spark plugs anyway if it has absolutely no effect on an engines performance???? Anyway to everyone reading this besides stoli. If you feel like your car is under performing. You should check the spark plugs. I DID and found them all to be incorrectly gapped from the factory by a large margin. After that was corrected. The idle smoothed right out and the car ran better! It's a very easy thing to do on these cars. It take all of 15 minutes! Or you can do nothing and live with it. Maybe stoli is right and the DA was 100% responsible for the increase in performance and had nothing to do with the changes in the gap I made. What if he's not right? His theory doesn't explain how my buddies car picked up 3MPH, 3 weeks ago after he received service? What do you have to lose even if it's only worth a tenth and a mile per hour? The point of this thread was to make people aware of a potential problem. Not quibble over DA. You can only try to arm people with information. Some people refuse to get off the tracks when you tell them a train is coming!:(

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