Nitroused383

iTrader: (10)

I have over 6000 miles on br7ef's with no issues, daily driving, 700 + mile road trips cruising around 1500 rpm. I used to have a lot of mis fire issues with my stock coils and msd wires. I upgraded to the D585 coils and run firecore wires, no more high rpm misfires for me. 14.0 is kind of rich afr especially if you have a cam with decent overlap. I shoot for around 15.1 as it produces the most crisp idle.

mike13

iTrader: (27)

Would I have to go open loop to run a leaner idle?

Also before swapping out the BR7EF's the 2nd time I also changed to truck coils and Grantelli wires thinking it would clear up the misfire.

oange ss

iTrader: (50)

I run BR7EF's gapped @.030 on 15psi with no problems, no problems with cruise or driveability.

Fbodyjunkie06

iTrader: (10)

Man, using a projected tip plug is just playing with fire especially at some of the boost levels being tossed around in here.

Do my B9EFS drive like a TR55...no. However they don't pop or misfire or break up at all. I do run Autolite 103's on the street driving to and from the track(equivalent to a projected tip 7 range NGK) and then swap to the B9EFS at the track.

I just don't see how a BR7 can cause issues when I and so many others have done nothing but just throw them in in lieu of a 6 range and run fine.

The Denso is a good plug though and a lot of new modern boosted cars from the factory run them. They are just pricey.

mike13

iTrader: (27)

I don't know, I was talking to Phil99 and he's had issues with the BR7EF's. Might not be common but not isolated.

MIGHTYMOUSE

iTrader: (59)

possibly helpful thread

https://ls1tech.com/forums/forced-in...s-crosses.html

i used to run autolite 103 (taper)
then switched to ngk tr6 for longer life
i used to run ar3911 (no resistor)/(gasket seat)
then switched to ngk 7173 for longer life (non resistor)
then switched to ngk 2668 for better drivability (resistor)

if you are on a stock computer make sure you are on a resistor plug

mike13

iTrader: (27)

Thanks David.

Fbodyjunkie what are your concerns with running projected plugs? Is it combustion chamber heat?

390/etp heads 706/649hp/tq 14% slippage thru torque converter @9lb's
11.2afr's, 95 octane (mix of trick114) 100% meth injection.

I'm thinking I should be fine with TR7IX's any compelling reason I should change them out?

1988montecarloss

iTrader: (6)

Having this same issue, car runs fine on the factory acdelco plugs, but with br7’s it misfires even with a .022-.024 plug gap

Game ova

If these guys haven't died of old age, maybe they will respond.

Dragframe

iTrader: (14)

😂😂😂😂.

now I’m curious. I wanna take the br7ef out of my nitrou truck and out tr6s in and compare

and another guy said above not to run 14/1 with a big cam as it is too rich... and my truck is far more crisp at 12.8 at idle. 🤪