I think you supposed to colder on this one... I know when people start going into 20+lbs they switch to bpr6es

 

Run 7es. Stock is 6es. 8es is overkill for 99% of people.

 

Correct me if I'm wrong, but doesn't NGK go backwards from other brands, like the higher the number the colder the plug? Why would you want to go to a hotter plug?

I've never had any problems with the bpr7es plugs.

 

NGK is backwards from other brands, and unfortunately if you cross over colder and hotter plugs from other brands, NGK for some reason calls for the same plugs for a very braud heat range.

Had a customer yesterday looking for a hotter NGK plug than what the catalogue called for for a 80's model 454 Chevy, but apparently the only NGK plug that would fit the motor was one set heat range whereas ACDelco and Autolite had about half a dozen options for his application.

Just trying to make a point, from my experience, that NGK makes for a complicated process when trying to find different options for one set application.

~Zach

 

With that said, its been proven that NGK's are the BEST plug for our cars...

7's are good enough for 90 % of us , Sure... Because 90% of us run street cars.. I run 8's in my 16g'd laser... I also run 26psi on pump gas... But I dont drive it much.. They foul out on the highway... At WOT the 8's love it...
I could get away with 7's maybe, but if you can light a cold plug, run it.

Rule of thumb: Stock boost-- Stock plugs...bpr6es
15psi-20psi.. bpr7es..
20-25psi... U can close the gap to .025-.027 on the bpr7es
Above that you need 8's or maybe even 9's... I believe I've seen 10's in the AMS drag Evo ... DOnt quote me on that...

 

I foul my BPR7ES's when running in colder weather on 30% xylene (118 octane). Real annoying.

 

You'll foul any plug running mixes with xylene, and toulene..(sp)

 

NGK plugs are ok, how much are you willing to spend? Pulsestar was rated best performance plug for forced induction by sparkplugs.com, after that E3 Diamond Fire plugs, then a host of NGK's.

Pulsestar's are +/- $25.00 a piece
E3's +/- $5.00 a piece

Sometimes price doesn't reflect quality. In this case it does, but how much are you willing to spend to eek out those last 3 horses. Take a look at the dyno results as well, both the Pulsestar and the E3's post lower torque numbers, but higher horsepower.

 

Drop the crack pipe and walk away... NGK plugs are the best for DSM's, the other plugs you mentioned are just black magic.

 

If standard NGk's can make over 650whp without fouling out and on a stock ignition, I'm PRETTY sure they are good for just about everyone.

 

Just to make myself clear, I didn't mean to say that NGKs aren't a good plug. I use them myself in most applicable cars, and recommend them at work for most every import. Was just decribing my experience with them.

~Zach

 

The germans always seem to have it an upper hand in automotive technology... Beru Ultra X Titan Plug
wonder where are they available..
I'm currently using Bosch Platinum M+4's haven't had issues with fouling (12Psi currently).
Used to have the NGK BPR6ES and always used to have fouling issues with it. since i switched my problems have disappeared.

 

Platinum plugs are THE WORST plug to run in these cars.

 

SO, say you're running 15-20 psi on a 50-trim or similar sized turbo and your compression is 9:1 you ought to go with the BPR7ES? I've read somewhere that for higher compression like 9:1 I should go with the non projected tip? Input?

 

I was overheating my 7's and causing pre-ignition @ 25psi on a 5031RE (flowing 48lb/min pump gas)

Besides needing 8's to chase peak performance from this turbo, 7's never fouled for me and always ran well. So take that for what it's worth. But I'm not going back to 7's.

 

Hubert, how did you figure out you were pre-igniting with the 7's??

The reason I ask is because I'm tuning a 60trim car running anywhere from 100-110 octane(the 110 is leaded) along with link, 980's, etc...The car runs well except for it has a few counts (under 5) at the top of 4th gear...he is currently running bpr7es plugs in his car.

 

On a side note.... Under 5 counts at the top of 4th gear is nothing to worry about... Back the timing off a degree at 5500 and above,and it should solve your problem....

 

ill pm you

 

I agree with k man, the standard plugs are great. I run bpr7es plugs at 31psi with a 50 trim and have no problems. At BOTI I helped Lucas English swap the plugs on Paul Nelson's evo and he runs bpr7es also. If Paul is running them, then I think that anything above is overkill, but not all cars are the same so some motors will like it colder.

 

So I'm going with the 8's then. 25+psi and won't be driven that often. Hopefully upgrade to the gt42.

 

the BR8ES are the non-projected tip ones, for *high boost* applications (per their paperwork).

 

I'm bringing this back to the top for discussion. There is so much debate in all these type of threads about what plug to use for high boost applications. Can we get a clear or somewhat clear answer of what NGK plug to use for lets say <30psi and >30psi?

I personally brought this up because I fowled my plugs after only 1k with BPR7es(running slightly rich at 10.2 a/f). I'm running 30psi on my 50trim and a average of 100octane(but will no longer run race fuel as I'm switching to meth) I plan to run 35+ this season and can't figure out if I should run BPR7es, or BPR8es.... So can I get a clear answer

Jordan

 

Stick with 7's.

I didn't switch to 8's until I made over 600whp.

 

BR7es here, SC61@31psi, 11.1 leaning to 11.7 up top a/f ratio, 16 deg peak timing at 8k rpm, 93+meth. There is no definitive answer since every setup is different, only a close guideline. You will probably be fine with 7's. Your fuel and rich mixture is probably what's fouling the plugs.

 

Jordan I use 8's. I had some small missfires when I ran the 7's. I also had some weird looking logs when I tried the br7es and 8s.

 

What does it mean when spark plugs start fouling? Sorry Real noobie question.

 

I think the more important question is "What gap should I use for 30+psi?" rather than "What plug?". You'll probably want to tighten your gap more than you think if your running over 30psi.

 

Very valid point, but 'personally' I already knew this, I'm just more curious about the plug. I've closed my plugs from .028 to about .026 not to much but just a little something to help with the higher boost.

I guess I'll stick with these 7's until I start boosting 35+ on my new setup this season... Then we will see what the 8's do.

Jordan

 

Ive only been apart of one car tuned for ~35psi and the only way he could get his slight stutter at high RPMs to go away was with a very small gap on 7's. I believe it was in the neighborhood of .020".