hot or cold plugs ???? whats best??
 

when i was tuning my skyline last year i bought some iridium plugs but before that i was going to buy hotter set ones. a tuner then told me the cooler plug is better when tuning etc as it is better for the engine.....the thing is i am doing a group buy on ayrshire scoobies and some one wanted pfr7b platinums(£23 a set ) and i have got pfr6b's (£16 a set) on my sti which are fine and correct to my knowledge...anyone got the REAL techy info as to which is best suited to lightly tuned wrx and sti cars....including uk cars too ! looking for 100% accuracey on this ! cheers rab.......

PFR6B is fine for standard and to about 300bhp beyond it is of benefit to go for the colder PFR7B imho..

Simon

i did have 6s until i had a remap , i now have the colder 7s due to the boost increase (recommended). people are always asking for the 7s on here though !

is it not the lower the number the colder the plug ?:wonder: i am sure it was when i done the skyline ??? hmmmmmmm:Whatever_

no.. other way

Rab just about to have my WRX remapped by Andy F and he has told me to go for a cooler running plug and has suggested an NGK heat rated 7. I am after a set of NGK PRF7B. I am up in Glasgow and would be intereted at that price. Where abouts down in Ayrshire are you as I work with some lads from Monkton and Stewarton who could possibly pick them up. Drop me a PM if this is possible.

cheers

NGK go one way on their ratings, Champion are the other. A bigger number on one is the same as a smaller number on the other. Don't guess though. There are conversion tables out there.