GDBSTi

Anyone know what the "coldness" rating is of the Standard MY02/03 STi sparkplugs are in comparison to the table in the link below?

http://www.hks-power.co.jp/products/plug/sfr_data.html

I need to get iridium sparkplugs to use with leaded racing fuel and what plugs that are close to the standard plugs.

rupert

Bob Rawle

The std plugs are rated as 6, you should use the S35i which is rated 7, the one grade colder will be a definate benefit as the 6's tend to overheat if you push hard. Don't fit the 40's as these run too cold.

Bob

GDBSTi

Thanks Bob

john banks

Bob do you still run the 7/S35 range yourself?

Bob Rawle

Hi John. yes, tried NGK PFR7B's, NGK racing 8's, HKS S40i's but non of them are as good (in my car) as the S35i's. They seem to be a very good all rounder and are just as happy at 2.3 bar as 0.3.

bob

GDBSTi

Bob

What plug gap should I have on the S35i's 0.7mm or 0.8mm

rupert

Bob Rawle

0.7mm is best

GDBSTi

Thanks once again Bob