what plug for approx. 1200 hp?
what plug for approx. 1200 hp? looking for someone to point me in the right direction for a plug to fit an lt1 head at approx. 1200 hp. tuner believes we're blowing the spark out on my TR6's so he thinks something equivalent to an ngk 9 is what it will take. is this too cold or about right? any help would be greatly appreciated
TR6's are good to about 450-500 rwhp. I ran #8's on motor and spray with about 500 rwhp motor and 800ish on spray. I still run the #8 (ngk 7317's for the LS1 head gapped @ 025) on my stock LQ9 with a PT88 pushing about 16 psi (guessing 625ish rwhp). I daily drive on that plug aswell without issue.
Fireball, are those 3911's recessed tips? The 3910 is colder? Seems like it should be the other way around.
Fireball, are those 3911's recessed tips? The 3910 is colder? Seems like it should be the other way around.
found a set of NGK 5673-9's which are basically the same as the 3911's from what i was told. if these don't work, i'll give the autolites a try. thanks a million guys, couldn't have found em around here w/out your help. hopefully these will solve the problem. everything was fine at 20psi, but anything over that would start "missing".
Last edited by TURBO383WS6; May 18, 2009 at 05:48 PM. Reason: added input.
Joined: Nov 2001
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From: Cecil County Raceway!!!
TR6's are good to about 450-500 rwhp. I ran #8's on motor and spray with about 500 rwhp motor and 800ish on spray. I still run the #8 (ngk 7317's for the LS1 head gapped @ 025) on my stock LQ9 with a PT88 pushing about 16 psi (guessing 625ish rwhp). I daily drive on that plug aswell without issue.
Fireball, are those 3911's recessed tips? The 3910 is colder? Seems like it should be the other way around.
Fireball, are those 3911's recessed tips? The 3910 is colder? Seems like it should be the other way around.
3933 (what I run) is non-projected
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14mm Thread
18mm (.708") Reach
5/8" (16mm) Hex Size
Tapered Seat, Resistor
Power Tip
Copper Core
Racing Plug with Nickel Plated Shell
Heat Range 3
Sounds pretty damn close to our 3911-3933s just a different reach.
The 3911s I ran last year are...
14mm Thread
19mm (3/4") Reach
5/8" (16mm) Hex Size
Gasket Seat
Non-Resistor
Power Tip
Copper CoreR
Racing Plug with Nickel Plated Shell
Heat Range 1
for heads using a stock style plug-the 103's are the right choice
for heads using the 3/4 reach gasketed plug-the 3933's are the ticket-the 3911's are good but for a f/i motor i don't like the projected tip
for heads using the 3/4 reach gasketed plug-the 3933's are the ticket-the 3911's are good but for a f/i motor i don't like the projected tip
Anyone use the AR473?
I have taper seat heads.
I guess I am a little confused with using a 103, thats equal to a tr6. I was using a projected tip tr8 with under 800 on nitrous.
I would have thought a tr9 equal would have been a good staring point at the 1000rwhplevel with my new turbo setup?
I have taper seat heads.
I guess I am a little confused with using a 103, thats equal to a tr6. I was using a projected tip tr8 with under 800 on nitrous.
I would have thought a tr9 equal would have been a good staring point at the 1000rwhplevel with my new turbo setup?
after a little testing w/ the TR9's, the hesitation and stumble i was getting is gone at 25 psi. guess my tuner dude knew what he was talking about after all. thanks for the input guys.