spark plug info. colder than NGK TR6??

[Scott Atk]

I'm running NGK TR6's on my GN1's with success, but would like to go one step colder. Anybody know the P/N? There's no such thing as TR7. THanks,

 

[MyBoosta]

I'm running NGK TR6's on my GN1's with success, but would like to go one step colder. Anybody know the P/N? There's no such thing as TR7. THanks,

Hello Scott,

I never ran TR7 but I do know that they exist. I used to run TR8's on my low 10sec Nitrous C5 Corvette. I ran that cool of a plug because I was running about 11.8 comp ratio and 29* of timing N/A and 22* of timing with 150 shot of N2O. The car NEVER EVER detonated even in the heat of Texas on 93 pump gas!

Part number as it appears on the box is:
R5671A-8
4554

Hope this helps:biggrin:

Thanks.

 

[d90dan]

I'm running NGK TR6's on my GN1's with success, but would like to go one step colder. Anybody know the P/N? There's no such thing as TR7. THanks,

Merry Christmas Scott!

Here are the NGK heat ranges.