I cheated and bought some iridium 7s for cruising and will run the BR7ef for dyno day. I will get some part numbers today.
BUILD THREAD 86 GP 2+2~Blown 6.0
- Thread starter 81cutlass
- Start date
So looking around it appears that general consensus is an extended tip TR6 style plug should be used only up to ~10-15 psi by some people and others say NEVER run a projected tip plug on boost. The projected tip can act like a glow-plug and auto ignite, the non projected tip plugs pull the strap in a bit and scrub the heat better through the head.
The extended tip is a bit more resilient to fouling out if you have crap ignition/fueling or running at cold startup temperatures. If the thing was a year round daily beater with 5-7 psi of boost, think a Tahoe/TBSS with a small M122 on 91 octane a TR6 seems like it's OK.
BUT, as mine is a summer only, is on E85 which is less prone to fouling the plug anyways, it's got relatively high IAT & boost, the extended tip is more of a risk than an asset, so yeah, time to look at a different plug.
I think my lazy 317 head & low compression helps. A TR6 would probably be fine and worth the risk if I was driving the car year-around more, but I don't see a BR7 being a risk at my level. There isn't any power gains switching from a BR to a TR, you trade off foul resiliency for safety, and foul resistance isn't something I care/need.
Thanks for the input, I shot our favorite exiled Saskatoon resident what he thought and that got this discussion started in my mind.
The extended tip is a bit more resilient to fouling out if you have crap ignition/fueling or running at cold startup temperatures. If the thing was a year round daily beater with 5-7 psi of boost, think a Tahoe/TBSS with a small M122 on 91 octane a TR6 seems like it's OK.
BUT, as mine is a summer only, is on E85 which is less prone to fouling the plug anyways, it's got relatively high IAT & boost, the extended tip is more of a risk than an asset, so yeah, time to look at a different plug.
I think my lazy 317 head & low compression helps. A TR6 would probably be fine and worth the risk if I was driving the car year-around more, but I don't see a BR7 being a risk at my level. There isn't any power gains switching from a BR to a TR, you trade off foul resiliency for safety, and foul resistance isn't something I care/need.
Thanks for the input, I shot our favorite exiled Saskatoon resident what he thought and that got this discussion started in my mind.
I used to get worked up worrying about the correct plug, but after watchin' some of the old Happel videos and seeing what he did with used 'whatever' plugs I don't think it's as much of a concern as I had made it out to be. I've heard of the extended tip being an issue with it acting as a glow plug, but I've never heard of that at low boost.
I'm an NGK believer though.
I'm an NGK believer though.
They run the same plugs as me, but are about to bump up to 8s. They run C16 and practically ZERO street miles. So much for a street car 😆
I've got over 2k miles on my set up and have used nothing but BR7s, between e55 and E90. Never missed a beat.
You wanna talk about some funky plugs eh...
If he could do a plug-n-play into the slave drive/aux receptacle in the rear like my '96 Camaro CD radio would be cool too. Could put the AUX input in place the cable for the MP3 player or cellphone won't get wrapped up with the floor shifter in three pedal cars.
He's running for governor or something.
