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supraman
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632 Posts
Discussion Starter · #1 · (Edited)
Running stock turbos at 20psi what is the ideal spark plug gap one should have? And will it make a difference in performance having the gap lower?:)

 

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Old School
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4,231 Posts
The biggest gap that doesn't misfire.

Experiment. :)
 

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supraman
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632 Posts
Discussion Starter · #4 ·
Is .030 too low?
 

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supraman
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632 Posts
Discussion Starter · #6 ·
Will it be OK if I was to use the stock platinum plugs which come with the tt or go for the NGK 3330's?
 

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Premium Member
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3,148 Posts
I wouldn't reduce the gap on the stock plugs that much. You want to run as much gap as possible without misfiring. I would guess about .035 (maybe a little less).

Later, Steve
 

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supraman
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632 Posts
Discussion Starter · #8 ·
Just Gapped my plugs at .030 man my car feels like a rocket compared to before. I had gaped it at .050 before the downpipe. After I installed the downpipe it was missing badly so I gapped down to .030 the idling is completely normal. The boost builds up real low at 2500rpm and the response is a lot quicker its great!! Planning to regap after boost mod to .026/
 

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Premium Member
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3,148 Posts
There is no reason to go below .030. Anything lower can actually hurt power.

Later, Steve
 

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Registered
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1,009 Posts
The stock plugs or 3330's at .030 seem to work well for me. I like the stock plugs slightly better though, same power and runs smoother at idle. Thay will also last a hell of a lot longer.
 

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supraman
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632 Posts
Discussion Starter · #12 ·
Thanks!! I read from this HPF site that you can go as low as .027 ? Im quite happy with the .030gap so I guess will stay at that.:D
 
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