BPR7ES or BPR8ES ????

[HustlerTalon]

Ok here's the deal....I read this thread http://www.dsmtuners.com/forums/showthread.php?t=233421

me and my buddy are close to getting our cars out finally...he's running a BR stage 2 with gt35r and all the supporting mods and I am running a Stage 2 SBR motor with a gt30r and all the goodies (check my profile for all the details). The last thing i ordered was a set of NGK BPR7ES plugs for both of us. After we got them he was saying that we should have bought the BPR8ES because of the setups that we are running. we will be running about 23-26psi on shitty 91oct (with no knock hopefully).

I was wondering if the BPR8ES plugs are just for race cars at the track or if they can be used on the street (daily driven)???

Also if any of you have gone with colder spark plugs than the BPR7ES and comments on their performance...

Thanks!

 

[andymoraitis]

BPR8's will load up much more quickly under part throttle driving. The best thing to do is install one set of each and then remove them for reading purposes after a bit of part throttle and WOT. Make sure you look to see where the timing band is and look at the porcelain to see if you detect any carbon fouling. I'd personally use the 7's in your application. I tried both setups in projected and non-projected tips and the 8's were obviously a bit too cold for the level of timing advance I run. Truth be told, I don't care for 7's either and prefer stock heat range Autolite 63's. They always show me an even timing band, don't load up and hold up well. Since different motors like different plugs, I'd try both and see which one is more suited to your setup. Just because an 8 loads up for me, it doesn't mean it'll do the same for you.

Hope that helps,

Andy

 

[HustlerTalon]

thanks man!

 

[andymoraitis]

Anytime! Just remember that your gap is pretty important to getting a proper burn. I've seen fouling and plugs that looked like they were a heat range too cold caused by having too large of a gap for the spark to jump. If you don't have an ignition amplifier like an MSD, I'd set your gap to around .026. I have a DIS-2 and still get the best results with a lower gap although I can run up to .034 without blowing out the spark at 25-26 psi.

If you have a chance, it would be great if you could post some pics of the 7's and 8's so that people can see what I'm talkng about firsthand.

 

[CanadianTSi]

The 7's and stock Ignition work fine for me at 26psi.

 

[HustlerTalon]

The 7's and stock Ignition work fine for me at 26psi.

my goals, power-wise, is about 400awhp on (23-26psi) so I am hoping the 7s work realiably, if not, the 8s will have the be purchased.

 

[andymoraitis]

For that power range, 7's are fine. Keep an eye on correct gap, run them and then post some pretty pictures for us to help you read them if you're unfamiliar with how to do so yourself.

 

[TAI92GSX]

I've run 7's with stock ignition gap at 0.026, 25psi pump and 28psi 110 octane mixed with pump. Car went 126mph and no sign of spark problem so it must be working. I've never had 8's in my car, so I can't comment on it. But try both and see what the car like best.

 

[2bclutch]

Not trying to hijack the thread but I kinda am I guess. I'm getting ready to put my newly ported turbo on my car along with a new radiator and a ton of other stuff and am also going to do the spark plugs. Which NGK's should I get? I'm running the EVO III 16G w/ all the supporting mods. I plan on running up to 18 PSI after I get it tuned. Any info would be great.. thanks guys. I was thinking the 6's but was also thinking of going one range colder to the 7's since I am more than likely going to run over 17 PSI.