Xavierviana
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What would be the best gap for the spark plugs?
Mustang GT 2015 (stock)
Mustang GT 2015 (stock)
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Best spark plug gap
- Thread starter Xavierviana
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Anthony 05 GT
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.049 to .053
.010 and it would not start
.010 and it would not start
GregP27
Well-Known Member
Agree, Anthony. I think it is .049 - .053 for stock, naturally - aspirated engines.
For a supercharged engine, it would be .028 - .032 gap for a boost of 10 - 15 psi. You would also need a 1 step or 2-step colder plug because boosted engine build up more heat more quickly, so you have to cool the plug with a plug heat range change. If you run more than 15 psi of boost, you'd need a smaller gap and perhaps a colder range plug. Your S/C manual should say. Your tuner should REALLY specify it.
For a supercharged engine, it would be .028 - .032 gap for a boost of 10 - 15 psi. You would also need a 1 step or 2-step colder plug because boosted engine build up more heat more quickly, so you have to cool the plug with a plug heat range change. If you run more than 15 psi of boost, you'd need a smaller gap and perhaps a colder range plug. Your S/C manual should say. Your tuner should REALLY specify it.
Anthony 05 GT
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He asked for stock gap
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