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What spark plug to use at 10 lbs of boost

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Old 04-06-2012, 04:47 PM
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Originally Posted by 2002SLPSSCAMARO
fbodyjunkie... ill be running a 408 iron block with a pt88 on 25lbs should i still go with the br7ef plugs...i have not got the car finished yet so getting this right before i take it to be tuned is key...thanks man
BR7 or B8EFS will be fine, personally if you're going to run 25lbs all the time the -8 will be safer. If your only going to run 25psi at the track on race fuel and always on race fuel at that higher boost level then you might could get away with the -7, but the -8 is still going to be safer here.

You won't be able to get anything cooler than a -7 at your local auto parts store. Order the -8's offline. Gap at .028-.030, tighten it up if it blows out on high boost.
Old 04-06-2012, 05:24 PM
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gonna run it on 25lbs all the time on pump gas and meth....does this change anything...car wont be driven much cuz i travel 10 months a year for work... but still wanna drive on street as well
Old 04-06-2012, 07:18 PM
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I think you're dreaming if you think 25lbs on a 408 is safe on pump gas + meth regardless of what plug you're running. Let alone thinking a pt88 will even make 25lbs on a 408, if it were possible back pressure would be 3:1 and you'd have so many detonation : head lifting issues it's not even funny.
Old 04-06-2012, 08:49 PM
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Originally Posted by Nitroused383
I think you're dreaming if you think 25lbs on a 408 is safe on pump gas + meth regardless of what plug you're running. Let alone thinking a pt88 will even make 25lbs on a 408, if it were possible back pressure would be 3:1 and you'd have so many detonation : head lifting issues it's not even funny.
Bad day?

When he said PT88 it didn't even really click he was wanting to do this on a 408 even though he stated it. I was thinking more about the plug selection on 25psi and on him needing to use race gas if he planned on 25psi. I would use the 8's for sure, but your going to need a S588 to make 25psi on a 408.
Old 04-06-2012, 08:57 PM
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Originally Posted by dschmittie1
NGK TR6's will be good at 10 psi. I ran TR6 plugs up to 15 psi.

Also you do not want to run a platinum or iridium plug on a boosted car
I agree.
Old 04-07-2012, 06:35 PM
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What issues do u think ill have with the pt88 and y?? Just tryin to get a better understanding on this... And i thought that by adding meth it would compensate for runnin pump gas instead of race gas??



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