colder plugs for 1986 325e

[nova15566]

iam looking for 2-3 step colder plugs for my 1986 325e that iam working on a turbo kit for. what plugs should i run if iam going for 8-10lbs of boost with 19lbs injectors and a 12-1 or 10-1 fmu. I think the stocks are bpr6e right? I tried to get some at autozone but they couldnt figure it out.


thanks and sorry for this if it is in here but i searched and found it last week but now i cant find it.

[nova15566]

anyone?

[nova15566]

so i have come to that article that i had found before but it say basic e30 things and not what motor the plugs are for. it recomends dsm plugs. BPR8ES which it says are 3 steps colder. are these what I want for my 1986 bmw 325e with 8-10lbs of boost of a t3/t4 with .48ar comp and .60ar turbine , large fmic, 19 lbs injectors and 12-1 fmu?


anyhelp please Iam trying to get this ready to drift in the next few weeks.

[nova15566]

so i read the bpr8es are 3 steps colder are those the ones? thanks

[mops]

it's kinda hard to say.

heat rating of the plugs are not the same across manufacturers.

lookup stock plug for e30, it wiill be a bosh type, try to get same bosh type, but, say 3 points colder. if they are fouling get 2 points colder than stock. keep the 3 point colder for track/drag/burnouts.

[lateapex31]

An NGK 8 is a pretty cold plug. I normally stick to 7 heat range until over 400 wheel HP on pump fuel. Use the heat stripe on the ground strap to judge. You want the color change to occur right around the bend. Color change down by the tip = go a step colder. Color change up near the base of the plug = a step hotter. If I had to guess, I'd say a 7 would be OK, but get some 8's just to be sure. NGK coppers are cheap.

AutoZone sucks, so you have to give them the NGK stock number, which is 2023 for the BPR7 plug. The BPR8 is 3923. They should be about $2.25 each, so get plenty.