EvoIIIAj

iTrader: (1)

Lmao.. I already ebay'd some feeler gauges :P

What are you doing this weekend? We could clean out the MAFs also if you're up for it.

420a-t

iTrader: (15)

Go as big as you can without getting knock or bowout.

That said start with .024 and go from there on pump gas

hiroki702

I'm running NGK BR8ES .16 w/ spoolinup cop 600whp

WelDun1

Damn, im seeing a lot of variation in gaps. The One Step Colder "8 Heat Range" has a stock gap of .032 and this is where i left it after i double checked each plug.
I had a few odd backfires in the past couple weeks running stock heat range 7s, so i checked my plugs and i was getting Pre Det in 2 cylinders so i decided to switch to 8s.
Everything seems to be running right, and it took care of some high gear hesitation that ive heard a lot of people talk about while just cruising, but i am still not 100% on the Gap.
Should i go down to maybe .028? Or should i leave it @ .032? & will it have effects on mpg
I am running stock 9 turbo 29psi on Pump 92oct making 394/381 on a Mustang Dyno.
I am trying to get all the parts for a COP kit together, i just need to order the harness connectors.

When i had my STi, running a GTX3071R 30psi on E85 making 455/413 i was running a tight gap @.016
My tuner swore by either .016 or .018 when running Ethanol at 30psi+
but im not running Ethanol, so im just looking for some opinions from others who have been through the same scenario.

llDemonll

iTrader: (21)

.020" or bust

WelDun1

Are you running Pump or E85?
If i was running Ethanol & a bigger turbo, i would definitely run a tighter gap, but im not sure with pump.
I did however close the Gap to .028 to see if it makes a difference.

llDemonll

iTrader: (21)

Pump. English Racing has always recommended that gap. .028 is HUGE, I was getting phantom knock from ignition issues at .025 when they last tuned my car and that's with a COP setup