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spark plug choice for boost?

This is a discussion on spark plug choice for boost? within the Forced Induction forums, part of the LSx Technical Help Section category; I'm fixing to start tuning on my turbo motor, I currently have an autolight racing plug ar-472 which is the ...

  1. #1
    Senior Member Sleeper101's Avatar
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    spark plug choice for boost?

    I'm fixing to start tuning on my turbo motor, I currently have an autolight racing plug ar-472 which is the coldest plug they make in it. But it doesn't seem to like them very well, its already killed a set of plugs (2-4hrs run time) it was on the rich side at first but I've about got it leaned out enough now. I have read the ngk-tr6's is a good starting point? Just wanna confirm with my setup.

    5.3 iron block punched to 5.7 with all forged internals
    9:1:1 compression
    60-1 precision turbo, starting out @ 5psi but will tune for 20-25psi
    Water intercooler
    Blow through carb
    Msd 10mm wires
    Stock ls truck coils
    93 octain pump gas

    Also curious between platinum and irid plugs
    This is also a street driven car so I want a plug its not going to kill everytime I get on the 2step or transbrake.

  2. #2
    ;) Packy's Avatar
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    Black/Screaming Yellow
    99 S/C TA WS6 & 04 Cobra

    NGK TR-6's for up to 12 psi. After that then go two steps colder with the NGK TR-7's.
    1999 Trans Am WS6 Black - Forged 346, P1SC (8psi), TH-400, and 12 bolt(3.73's)
    10.29@129 w/1.60 sixty foot

    2004 Screaming Yellow Mustang Cobra - Whipple 2.3, Exhaust, & CCW's...My DD

  3. #3
    Senior Member Sleeper101's Avatar
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    Would you happen to have the part # for the tr-7's? My local parts store couldn't get a cross.

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    ;) Packy's Avatar
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    Black/Screaming Yellow
    99 S/C TA WS6 & 04 Cobra

    Quote Originally Posted by Sleeper101 View Post
    Would you happen to have the part # for the tr-7's? My local parts store couldn't get a cross.

    BP7EFS stock number 3526 at Advance Auto. $1.98 each...there is no "TR7"...but this would be it if they kept the TR designation.

    http://ngksparkplugs.com/images/pdfs/product_list.pdf
    Last edited by Packy; 05-06-2011 at 05:33 AM.

  5. #5
    Senior Member Sleeper101's Avatar
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    Thanks man. I'm gonna get a set of each on the way.

  6. #6
    Senior Member FasstChevys's Avatar
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    good info

    What's the recommended gap? I used to know.....

  7. #7
    Senior Member Sleeper101's Avatar
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    Most run between .035 and .038

  8. #8
    ;) Packy's Avatar
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    99 S/C TA WS6 & 04 Cobra

    I do mine at .032 to .035

    They always seem to grow a bit over time. The last set I pulled out were around .038-.040

  9. #9
    Member youngrigo's Avatar
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    TR7 at .35
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