NGK TR5 vs TR55 plugs???
Thread Starter
11 Second Club
Joined: Dec 2002
Posts: 169
Likes: 4
From: Millersville, Maryland
NGK TR5 vs TR55 plugs??? Q: What is the difference between NGK TR5 and TR55 plugs? Are they maybe identical except for how much they are pre-gapped?
I just finished putting in new plugs. While I was cleaning up and tossing out the boxes I just happened to notice that boxes are labeled TR5 rather than TR55.
Although it’s partly my fault for not double-checking, I’m really ticked off at Advance Auto. I had given my wife a slip of paper with the number TR55 written on it. She handed the paper to the store clerk and told him that that is what she needed. I installed what he sold her.
So, do I now need to pull them all out and replace them with new TR55’s? Or, since I gapped them myself to .050 is it really the same thing? From the little I can find online, they sound like they might be the same plugs since they are both described as "stock heat range." The TR5’s are pre-gapped at .035 and the TR55’s at .050.
I just finished putting in new plugs. While I was cleaning up and tossing out the boxes I just happened to notice that boxes are labeled TR5 rather than TR55.
Although it’s partly my fault for not double-checking, I’m really ticked off at Advance Auto. I had given my wife a slip of paper with the number TR55 written on it. She handed the paper to the store clerk and told him that that is what she needed. I installed what he sold her.
So, do I now need to pull them all out and replace them with new TR55’s? Or, since I gapped them myself to .050 is it really the same thing? From the little I can find online, they sound like they might be the same plugs since they are both described as "stock heat range." The TR5’s are pre-gapped at .035 and the TR55’s at .050.
TECH Enthusiast
Joined: Dec 2003
Posts: 535
Likes: 0
From: Warner Robins, GA
The parts guy told me they are identical so I went with TR5's . I can't see any difference between the two except for the gap. But since I gapped them over a year ago I don't recall what the gaps were.
I would say use them.
I would say use them.
www.ngk.com this will tell you everything you would ever want to know about ngk spark plugs.
You are correct, here you go. http://www.ngk.com/results_cross.asp?pid=tr5
http://www.ngk.com/results_cross.asp?pid=tr55
You are correct, here you go. http://www.ngk.com/results_cross.asp?pid=tr5
http://www.ngk.com/results_cross.asp?pid=tr55
TECH Senior Member
Joined: Nov 2001
Posts: 7,234
Likes: 1
From: Mississauga, Ontario
They are identical except for the gap, they are the same heat range. The TR5 comes pregapped at .039 while the TR55 comes in at .059. The one you choose depends on what gap you want to run, since it's recommended to only change the pre set gap by ten thou either way. So for the TR5 you can run it between .029 to .049 and the TR55 is good for .049 to .069.
Since the LS1 likes a .050 gap, you could really run either plug and you'd be fine.
Since the LS1 likes a .050 gap, you could really run either plug and you'd be fine.
Originally Posted by freakynipples69
TR-5's are used for nitrous application due to a colder gap. TR-55 are for N/A applications.
Bill
Originally Posted by freakynipples69
TR-5's are used for nitrous application due to a colder gap. TR-55 are for N/A applications.
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The second digit (55 vs. 5) specifies the larger gap, other than that they are the same. Also, GM updated the gap requirement for the LS1 such that the TR5 is actually the better plug to run based on the later GM update. If the Advance Auto guy looked them up, he probably saw the TR5 based on the GM change.
TECH Senior Member
Joined: Nov 2001
Posts: 7,234
Likes: 1
From: Mississauga, Ontario
They are great plugs, but do they even make them for the LS1? I thought they were only available for imports. I know they are the OEM plug for my Honda Civic. Their main benefit is they last a very long time, so if you're gonna be changing them frequently you might as well stick with the copper core NGKs. You're not going to make more power with iridiums.
