im getting ready to put a turbo on my f20. i was wondering if anyone had any info on spark plugs ie... do i need to go colder and if so how cold from factory. i will be running 10 pounds on stock compression with 750cc injectors at about 6000ft elevation. i already built the engine and head and installed kpro.

 

NGK, Heat range 7, plain copper plugs. 1.99/piece

Forget the model/part number of the top of my head.

 

This is something i haven't really looked into. I've been supercharged and i've been running NGK Iridium IX spark plugs. Soon going turbo, and i just plan to use the same type of spark plugs.

 

We prefer NGK Iridium plugs. They have been effective up to 750 BHP for us. We use no. 7 up to 375 BHP, and 8 above. You can find them here, along with a gap reference.

http://scienceofspeed.com/products/e...GK_Spark_Plug/

 

Thanks, i wanted to keep iridium plugs anyway, plus I'm thinking of going for 400hp, would 800 cc injectors cover that, or can i still get enough fuel from 750

 

I use these as well.

 

I used NGK BKR8EIX

 

Most folks go with 1000cc ID injectors, however 750cc should get you your goal, but likely nothing beyond that.

 

Now i just got my head back from the machine shop and I'm missing a rocker arm piston, i hope it's at the machine shop or I'm in trouble, anyone know where to get those, i need one long one, the one with a hole all the way through it

 

At the power level I'm at this is what I use, but on 7's I think the copper is fine imo.