What plugs should I upgrade to?
01-29-2007, 09:37 AM
#22
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Originally Posted by erikthegoalie
TR55's come gapped @ .055" at least the last 5 sets I have had to buy were...
It all depends on power too...the more HP made, the smaller the gap gets..you will see a lot of guys switch to the colder plug, like the TR6 when they go heads/cam/N20/power adder
I currently am experimenting with TR55's gapped to .045".....they were not burning right at stock gap (.055) so I closed it a bit....mind you I am head/cam car...stock I ran reg TR55's out of the box..
I feel the best way to select plugs, is by reading this site, and testing different gaps yourself...removing plugs is not that hard....well except for #8
It all depends on power too...the more HP made, the smaller the gap gets..you will see a lot of guys switch to the colder plug, like the TR6 when they go heads/cam/N20/power adder
I currently am experimenting with TR55's gapped to .045".....they were not burning right at stock gap (.055) so I closed it a bit....mind you I am head/cam car...stock I ran reg TR55's out of the box..
I feel the best way to select plugs, is by reading this site, and testing different gaps yourself...removing plugs is not that hard....well except for #8
01-29-2007, 06:58 PM
#24
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Originally Posted by lsx24
This may be a newb question, but how do you "gap" plugs? As far as I know spark plugs aren't "adjustable", so there's no setting on the actual plug themselves to set a "gap". Do you mean when you install them, or before you install them? How do you gap them? What tools would you use? Thanks for the info!
01-30-2007, 12:30 AM
#25
what does making the gap closer together vs farther apart do? does it cause the car to run lean or rich? also, what's a good gap for tr55's with no cam or nitrous mods. just a few induction mods (lid, ported tb, ssra, etc)?
01-31-2007, 12:17 AM
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just got some NGK TR55's/MSD wires in from ws6store and im going to check the gap once i get a little 99 cent gapping tool from autozone tomorrow and ill let yall know what my set is gapped at. from what i have understood anywhere from a .05 to .06 is good on a LS1 and i don't understand why now a .044 would be ok on the same model number plug (3951)...can someone clarify this? Thanks -Karl
01-31-2007, 02:46 PM
#29
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I sent NGK an email a few days ago asking if they changed the TR55 (3951) and why the gap is listed different now on their website. Here's their response: "The spark plug has not changed. TR55 will still be preset to .060. The reason for the change in recommended gap setting comes from a change at General Motors with the supplier for O.E. plugs. The new supplier builds the plugs to .044. We have changed our application data to match that of GM. If you have had good success at .060 install TR55 as it comes out of the box." So, someone buys the plugs, they're gapped at .060, look up the gap listed on their chart, see .044. Messed up if you ask me.
01-31-2007, 03:06 PM
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Originally Posted by Danger731
I hope everyone checks the plug gap before installtion.
01-31-2007, 03:24 PM
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Originally Posted by 2001NBMZ28
I sent NGK an email a few days ago asking if they changed the TR55 (3951) and why the gap is listed different now on their website. Here's their response: "The spark plug has not changed. TR55 will still be preset to .060. The reason for the change in recommended gap setting comes from a change at General Motors with the supplier for O.E. plugs. The new supplier builds the plugs to .044. We have changed our application data to match that of GM. If you have had good success at .060 install TR55 as it comes out of the box." So, someone buys the plugs, they're gapped at .060, look up the gap listed on their chart, see .044. Messed up if you ask me.
01-31-2007, 03:26 PM
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Originally Posted by lsx24
How you do "physically" adjust the gap? Is it on the plug itself? Sorry but I'm having a hard time visualizing gapping. I didn't know spark plugs were adjustable (if they are adjusted on the plug itself).
01-31-2007, 03:32 PM
#33
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Originally Posted by RPM WS6
To adjust the gap, you have to bend the ground strap closer or further (up or down) from the center electrode.
01-31-2007, 03:36 PM
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Originally Posted by lsx24
I'm picturing the metal that "comes over" the tip of a spark plug, and that thing would be hard as hell to bend!
01-31-2007, 03:42 PM
#35
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I double checked the email they sent me, does say .044, but maybe a typeo on their part? Notice they didn't specifically say to regap (their unchanged plug) to .044?
