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Posted by black_gst, Feb 22, 2010
Bolt-on Tech - 4G63 intake, exhaust, intake manifold, ignition, fuel system, cooling, etc.
i mistakenly bought them without realizing it just wondering if anyone else has run them
There may be some issues with longevity between one or the other depending on the engine, but I think most of us change plugs often enough that it wouldn't be an issue regardless.
a friend of mine is running them with good results and hes boosting 27psi and i am planing to boost atleast 25psi as soon as i install my 255 and im gonna shoot for 30 on race gas
I'll agree with Calan's post above. I noticed no difference in performance with projected tip VS. non-projected tip. The only difference that I noticed is the non-projected plugs didn't seem to last as long. But then again, my car normally eats plugs pretty frequently.
Yep...if the plug tip runs too cold, there isn't enough heat to keep the crud burned off of it.
It depends on several things, like cylinder pressure, type of fuel, plug gap, ignition condition, etc. The colder the plug, the more the cylinder temperatures will be reduced due to the plug's ability to transfer heat away from the spark plug tip.
Aside from the fouling issue, I would think that you could eventually get to a point where you also need more latent heat for certain fuels....but this is just a guess. We are normally always in search of cooler charges and slower burns, but I'm not sure at which point enough is enough...if that point even exists.
Try them and see how it runs. You're only out $5 and 5 minutes to swap to something hotter if needed.
yeah well $10, $2.50 a pop
also with a colder plug can you increase gap?
and ill pull the plugs in 500 miles or so and see how they look and post pics
Ok.. I thought $5 sounded a little low but it's been a while since I bought plugs.
If anything, you'll want to go with a slightly smaller gap if you plan on running upwards of 30 psi. At that boost level and beyond, spark blowout can start to become an issue...so a solid ignition system is also a must.
I was actually having some blowout issues at 25 psi, but I also had weak ignition coils. Going to .025" gap seemed to help some, but once I changed the coils it was fine when I went back to .028".
I'm kind of curious now to test out BigLady's results with the non-projected tips helping with blowout. Seems logical and obviously worked for them.
eventually i would like to go COP with an ARC box but thats $500-$600 that im not ready to spend yet .
Most of the reputable peeps will tell you to stay with stock ignition over the COP setup. I haven't tried a COP setup myself, but I've heard plenty of people who are making good power say that it just isn't worth it. You might want to research it a bit more before spending that $500 when you get it.
BR7 on the left, BPR7 on the right
yeah i wouldent even do it unless i had a problem... but everything i had read said that a COP is a downgrade without an ARC box