Ok when I was stock I ran TR55s.. Then with all the mods in my sig including cam I changed from TR55s to TR6s.... I know that a TR6 is a colder plug..

So with my set up (see sig for all mods) which plug should I be running? my speed shop suggested the TR6... I've been getting conflisting results from everyone.. My TR6s have 10k miles on them so I was thinking of changing them out..
So TR55s or TR6s????

If I run the TR55s, run them at .040 or .050 gap

I think my TR6s are gapped right now at .035

Thanks

 

Id stay TR55s, Tr6s if your spraying up to 100 shot.

 

Yeah I'm an N/A motor here

Am I hurting anything runner a colder plug??

 

I dont know if your hurting anything, but that is a tight gap.

Cammed, with full bolt ons i ran TR-55s @ .050. I didnt switch to 6s until i added heads.

 

Hmm well maybe come spring time I will change back to TR55s gapped at what .040 and get new wires.. Both plugs and wires have 10k miles on them

Where's the best place to get the NGK plugs? Havent bought plugs since 2006

 

Im cammed full bolt on with AC Delco Iridium 41-985. They are pre gapped at .035. These are also factory plug on the newer GM vehicles.

 

IMO, you don't need a colder plug unless you add a bunch of compression or a power adder where you need the plug to transfer the heat out. Stick to the tr55 for a cammed car, they'll stay cleaner and last longer. Stick to the factory gaps too, there's no reason to tighten up the gaps on a combo like yours with modern coil-on-plug ignition systems. The wider gap will promote a more complete burn.

 

Agreed!!!!!!!!!!!

 

Mike likes the 6's when he tune's. because he like to not really play with the knock sensor and timing.

 

I agree with the first part of your post, but disagree with the tr6's on a cammed 100 shot setup...
Nitrous
H/C/I ls1- ngk br7ef up to 100 shot, br8ef 100-150, br9 150-200
cammed/bolton ls1- (ngk br7ef) for a 100-150 shot, br8 150-200
completely stock ls1- tr6's up to a 100 shot max. br6ef is better choice
Na
H/C/I ls1 w/ 11:1+ - tr6.
stock/ modified ls1 running stock compression- tr55

 

I run the Tr6 plug in my personal car on motor. I deal with Brandon @ NGK. He is the man on plugs. Call up NGK and ask for him. They have unreal customer service and Brandon is a big help.

Graham @ N20

 

I recently installed ngk tr55 iridium ix in my silverado and they were pre gapped at .058. Also have the same plug at the same gap in my ls1. Not sure why you would want to run .035 gap... all thats doing is costing you fuel mileage.

 

There is nothing wrong with TR55s in a H/C vehicle with 10.5:1 compression.

I say go to TR6 when you're H/C and have an 11.1:1+ compression

 

Yup... fwiw I always ran tr55's in my h/c/i 383 lt1 car. It was 10:1 and ran great with those plugs.

 

This just gap it .045-.050

 

the benefit of iridium and platinum plugs are longevity, not performance (except when talking about performance past the lifetime of a copper plug)... gapping them differently from stock should only be done if you're changing how hard it is to combust your fuel mixture. That's my understanding anyway.

 

I'm running TR6's NA with 62cc combustion chambers. No problems and the color after 15K miles was light brown. Gap=0.050.

 

Im running tr55's.I dont pickup any detonation on my scanner on any wot runs.If you feel you are getting excessive detonation with tr55's,then switch out to the tr6.If you are over 11:1 compression,then just go right to the tr6.Most H/C cars should run tr55 Imo

 

I think I willl go back to the TR55s.. What gap should I run them at?

I hope my car won't knock or detonate.. What cause it to do so?

 

A loose rule of thumb is for every 100 RWHP you add you should go 1 step colder in the plug.

You aren't hurting anything by running a TR6.