I am going to remove the blower and intercooler this weekend so I can clean it out and this is a great time time to change the plugs. Right now I am running IT20's and everything seams OK, will find out once I remove the plugs. My question is will it be OK to run the BR7EF's with a 4lb lower? I did a search and it looks likes 12-13psi of boost is on the lower end for the BR7EF's. All my mods are in the sig. Also should I gap them at .038 or .040 since some people have an idle issue with these plugs.

 

i am still running the tr-6's but i think you should be fine
i have heard they are better than the denso's
but that is just me and what i heard

 

I run the AR-94 which is the same as the BR7EF temp wise without the idle issues.....


MOTORCRAFT

PART# / HEAT RANGE
AWSF-32C / stock heat range - copper plug
AWSF-22C / 1 Heat range colder - copper plug
AWSFA-12C / 2 Hea range cooler - copper plug
AGSF-32C/ Recommended for FRPP heads(not sure on heat range)

NGK

PART# / HEAT RANGE
TR-55/ 3951/ Stock Heat Range
TR-6/ 4177/ 1 Step Colder
BP7EFS (PN - 3526) BR7EF (PN - 3346) two steps
R5724-8 (PN - 7317) two and a half steps
R5724-9 (PN - 7891) three steps
R5724-10 (PN - 7993) four steps

AUTOLITE

PART# / HEAT RANGE
764s / Stock
AR103 / 1 heat range cooler
AR94 / 2 heat range cooler
AR93 / 3 heat range cooler
AR92 / 4 heat range cooler

CHAMPION

PART# / HEAT RANGE
YS-59C / -3 or -4 below stock heat range

DENSO

PART# / HEAT RANGE
IT16 / stock heat
IT20 / -1 heat range
IT22 / -2 heat range
IT24 / -3 heat range

 

I run Denso IT-22's @ .038 - .040 with 4 or 6 lbs of Extra Pulley, WITH NO PROB's. (3rd Summer on the same plugs)
The 7's should be fine

 

What is the difference between the BR7EF and BR7EFS in the above list?

 

I have the BR7's with a 4# in for about 16,000 miles now and have gapped at .035. The idel has always been a little rough but I can live with that.

 

Do you guys have your tuner account for different brand/range spark plugs when burning you a program?