Plug gap for 26+ PSI through Whipple?

Just curious what gap people are running with setup making 26 PSI or more through a twin screw with stock ignition coils? Let me know please.


Did my first pull with a stock lower and 2.75 upper pulley on my Whipple 2.9 STD inlet, it pulled solid until 5000 RPM then started breaking up. I'm not sure if it is spark blowout or a weak coil. It built 26 PSI by 4500 RPM. I'm leaning toward a weak coil but just curious what plug gap has worked for others at this boost level.

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Think I’m at like 26 on 20/21 psi.

Not sure if people go tighter or not? What are you at?


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I'm at .028 on 21lbs. At 26lbs I'd start at .024-.026 range. Maybe I missed it, what type of plugs are you running?

I've seen some people go down to .022 range.

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Br7ef plugs @ around .024

26-28

26-28

My bad, I forgot to bit that bit in. I'm running BR7EF at .025 gap currently. Which it seems like others are running about without much issue.

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04OWwhipple said:

My bad, I forgot to bit that bit in. I'm running BR7EF at .025 gap currently. Which it seems like others are running about without much issue.

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That should do the trick. Might be time for some replacement coils.