L67toLS1

iTrader: (4)

Would NGK TR55's be suitable on a pretty much stock LS1? If so, what gap, and what wires to go with?

Thanks,
James

2MuchRiceMakesMeSick

TR55s are good and I would stick with the stock wires unless they have alot of miles on them

BayAreaSS

iTrader: (10)

Tr55's gapped at .55....if you have a lot of miles i would get some msd wires.

EchoMirage

iTrader: (3)

i put GMPP wires on mine, still with stock plugs. adds maybe a little power, but theyre red, so they look nice. if youre going through the hassle of changing plugs, might as well do the wires while youre there, just for the hell of it. GMPP only cost around $50 i think.

2001NBMZ28

NGK's website used to say .050 for 98, and .060 for 99 and up last time I changed mine. Gapped mine at .055 a couple years ago on the 3951's. Now they say .044 for the TR55's. Going to change mine soon and thinking about going with something different. Don't know if they changed the plug or what?

RPM WS6

iTrader: (3)

TR55s gapped @ .055 and stock wires here.


Interesting. I wonder what the factory gap is on the TR55s now? They used to come gapped at .059 from NGK. But if they recommend .044 now, that would be a drastic regapping from the previous factory set gap. Usually changing the gap on a plug by that much is a no-no. So does anyone know what NGK gaps the TR55s to from the factory now?

drain89

iTrader: (13)

I just bought a set of tr55's (3591's) and they were pre-gapped .044. Should I re-gap them?

00Z28MK

iTrader: (1)

My car is a 2000 and has 116k. I am getting ready to replace the plugs. i was going to go with stock plugs and wires. What is the advantage of changing wires? How much difference can they make since they are so short. About the plugs, do the NGK's really make a difference?

RPM WS6

iTrader: (3)

Good info. I can't imagine that .044 would be best for a stock LS1 unless the TR55 is a colder plug now. I know GM has issued a new 'factory' plug for the LS1s that has an iridium tip and comes gapped from the dealer @ .040. But that's with the iridium tip. If the NGK TR55 is still the standard tip, I wouldn't feel good about gapping it at .044, IMO.

2001NBMZ28

That's why I threw out the question, my old ones came gapped at .059 also. Always thought any deviation of more than like .08? + or - wasn't good.

RPM WS6

iTrader: (3)

Personally I don't see any advantage to the aftermarket wires for LS1s. The distance to the plug is so short, that the gains won't even be measureable. If you want to get some aftermarket stuff for better appearance because the stock wires are shot, that's fine. But you won't see any gains swapping out a good condition set of stock wires for an aftermarket set.

JZ28

iTrader: (3)

Can anyone back up that the iridium plugs need to be gapped differently than any other plugs? I have a set of NGK iridiums waiting for me at home (along with a sh!tload of other parts), and I don't want these to be the cause of any problems. I believe the site I bought them off of says they come gapped at .055 They are TR55's

Also, about the wires. Just because they are so short does not mean that they are all the same. Plug wires are typically rated in the thousand's of ohms of electrical resistance PER FOOT. Between that, and the size (8mm MSD) for example, there is a difference.

brad8266

iTrader: (23)

TR55's @ .050-.055, any wire will work fine.

BriancWS6

iTrader: (18)

.08 (eighty thousandths) would be HUGE, which is over 5/64ths. I am assuming you meant .008, (eight thousandths).

As far as the original question goes, stick with the .055 gap for the TR55s. Never install a set of plugs without checking the gap first on ALL the plugs.

JZ28

iTrader: (3)

Should the gap be set any differently if the plugs are iridium? There seems to be some confusion on this (myself included).

RPM WS6

iTrader: (3)

The iridium plugs from GM do in fact have a different gap from the factory recommended gap for the stock LS1 platinum plugs. And GM specifically states that the new iridium plug for LS1s should not be re-gapped to the original factory recommended gap of .060. They say to leave the iridiums gapped at .040, even in the LS1.

As for non-Delco iridium plugs, I have no idea if they can/should be regapped.

greysteel_M6

iTrader: (5)

TR55's

lsx24

iTrader: (45)

erikthegoalie

iTrader: (29)

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

XpEdItIoUs

iTrader: (44)

Stick with the stock AC Delco iridiums.