The Best Spark plugs?
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
TR-55s and TR-6s are the most common choice. I find they idle well and that's why I like 'em. The TR-6 is one range colder than the TR-55 and is the most popular choice for running nitrous. I like it for running NA as well because it helps in fighting detonation. I find that I can run just a smidge leaner at WOT without pinging and I like that. BTW, the TR-6 comes gapped at about .039 instead of the .055 or so that the TR-55 comes gapped at. I'd re-gap them to about .045-.049 for NA use (a narrow gap can cost you just a couple of ponies.)
As far as there being any REAL HP difference between plugs, no.
As far as there being any REAL HP difference between plugs, no.
Joined: Nov 2001
Posts: 34,629
Likes: 2,550
From: Schiller Park, ILL Member: #317
Originally Posted by WS6FirebirdTA00
ngk tr55 do a search that is 90% of what u will see
Originally Posted by Colonel
As far as there being any REAL HP difference between plugs, no.
but seriously, cant go wrong with the NGK's, im running the tr55's gapped @ .055 and have no problems or complaints with them
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Yet another TR55 fan. I left them gapped at .055 the way they came, and they are great compared to the Bocsh platinums I took out. Fixing the #4 coil pack didn't hurt either. Joined: Nov 2001
Posts: 34,629
Likes: 2,550
From: Schiller Park, ILL Member: #317
Originally Posted by CamaroSS
I think any gain I would see would be frmo an old battered plug, to a brand new clean plug. At around what mileage should I change them?
NGK TR55s should last at least 20-30K depending on what type pf driving you do. TR6s about half that, from what I've heard....
