I have a TVS swapped GT500 tuned by VMP with have a 2.4 Pulley and VMP 67mm. I’m wondering what boost I could be making and what gap on my SP471 spark plugs. Thanks!
Recommended spark plug gap?
- Thread starter 08vapor500
- Start date
.028-.030
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Set them at .30 and I’m getting a lot of surfing around 1500 to 2500 and the idle is a little rough. Should I drop down to .28 or back off to .32?
Is the car fully warmed up? In general colder plugs will give a rough idle when not fully warmed up
As others have said .028-.030 is the correct gap. More info on VMP site on spark plugs and gap. Spark Plug 101
Try double checking the coil pack/boots are fully seated on the spark plug, maybe one is not making good contact.
Try double checking the coil pack/boots are fully seated on the spark plug, maybe one is not making good contact.
Similar setup set at .028
Ive got my TR7ix's gapped at .032 with no issues. Same gap when i had a Trinity TVS setup.
Gapped plugs down to .28 and checked for any leaks. Still getting a nasty surging/popping maby possible detonation at 2k RPM. It also does this with no load in neutral. Going to do the idle to 5k datalog tomorrow.
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Just throwing this out there but you sure you don't have any vacuum/un-metered air leaks?
I reinstalled the CAI intake and checked around the supercharger for any leaks. I ended up picking up another set up plugs and gapped them to .32 to start with. The car is running great and no more surging/misfire around 2k.
Your plugs had nothing to do with the idle hunting.
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