OliverM5

Title says it all, anyone see any performance/dyno differences between the two plugs?

Colonel

Seems like I've answered this question a dozen times lately...once already today infact.

Moving to External Engine...

Oh yeah, the answer is no. <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

Trevor @ Texas Speed & Perf.

iTrader: (3)

NGK TR55's are a stock heat range spark plug; this is what is normally used in N/A applications. The TR6 spark plugs are one heat range colder than stock and are most popular among the nitrous users. They will work well in higher compression ratio setups as well.

Trevor

99 Black Bird T/A

iTrader: (4)

When my car was a bolt on only car, TR6's cost my car about 3mpg compared to the TR55's.

However,

I heard a rumor that Chris Marsh at AMS has tweaked as much as 12rwhp more out of heads and cam cars with TR6's gapped @ .045 over what the TR55's did.

Anyone know?

Patman

TR6s didn't hurt my gas mileage at all. I still got 30.0 MPG highway with TR6s and with 4.10s in the car!

I ran my 12.68 with the TR6s in there too. When I went to TR55s later, I noticed no change in performance or MPG.

Fulton 1

iTrader: (9)

As I recall the TR6's are actually only one-half heat range colder than TR55's. I can't vouch for any power increases, but after I installed my cam I was running HPP3 power tuning and MAF ends and started getting some KR (this was with a fresh set of TR55's). I switched to TR6's gapped at .045" and it eliminated the problem.

ggr12

I just got some TR5s. are these the same as the TR55? not sure just asked for tr55 and they cam in and the boxes say TR5. any difference?

ratio411

I might be totally off base, but I heard that TR55s are just TR5s that have been pre-gapped at the factory. The TR6 is colder and the TR65 is again, a pre-gapped TR6.
Anyone else understand it that way?
Dave

Colonel

Hell they're ALL pre-gapped at something.

A TR-5 is a TR-55 gapped at .039 which is the same gap as a TR-6. The TR-55 is gapped at .059 I believe.

Colonel

...And I would assume that a TR-65 (which I've never heard of) is a TR-6 gapped at .059.

JimMueller

iTrader: (9)

If the TR6 works better with higher compression, which range of compression are we talking about? If that's not clear, I mean at what compression level should one consider using TR6's instead of 55's? 10.5? 11? 13?

ratio411

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by JimMueller:
<strong>If the TR6 works better with higher compression, which range of compression are we talking about? If that's not clear, I mean at what compression level should one consider using TR6's instead of 55's? 10.5? 11? 13?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I don't think there is any one ratio you can peg for needing cooler plugs. It is just a matter of cooler plugs helping fight detonation. If you have detonation, and have tried other remedies, then you can try cooler plugs. Cooler plugs will help with detonation, but they supposedly have less power producing potential. So there are other ways to stop detonation and cooler plugs should probably be the last option. To make optimum power, you should run the hottest plugs possible without causing detonation... This is not my opinion. This is echoed in performance mags by 'super tuners' and engine gurus like Smokey Yunick.
Dave

99 Black Bird T/A

iTrader: (4)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Patman:
<strong>TR6s didn't hurt my gas mileage at all. I still got 30.0 MPG highway with TR6s and with 4.10s in the car!

I ran my 12.68 with the TR6s in there too. When I went to TR55s later, I noticed no change in performance or MPG.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Very interesting. I check MPG every tank of gas.

I ran the TR-6's for several thousand miles and the mpg stayed lower. When I went back to TR-55's the MPG increased back to what it was before.

Anyone think of a reason two similar cars would respond so differently to the TR-6?

Car idled rougher etc with TR-6's? They carbon'd up way faster than the TR-55's did too when we pulled them out a few months later.

FWIW: my mpg loss with heads and cam and 4.10's is no worse than with the TR-6's ~ 19 to 21 mpg. Before H & C and gears, my mpg was ~23 to 24 mpg normal driving. Car's best mpg was 32.8mpg with a 32.5mpg and lot's of other times in the 30's to back that up on highway trips.

Patman

It's puzzling as to why two different cars with the same plugs would react differently but it may have something to do with the type of driving I do. Perhaps because I didn't do many short trips, the cooler plugs didn't hurt. I did foul them out pretty quick, about 13k, but other than that I noticed no problems at all with running the colder plug in a N/A application.

Damian

iTrader: (89)

My car ran a ton better with the TR-6's as opposed to the TR55's. The 55's were a bit to hot and my car didn't like it, detonating in the summer heat and such. Threw a set of TR6's gapped @ .044 in and the detonation was gone, car pulled like a new animal afterwards. However, don't base your decision on my car. Every car is different, and you may see the exact opposite results. The best way to find out what your ride will like is to try them both. Spark plugs are cheap, and gives you more practive so you can do them quicker the next time around.

Josh

SStolen

iTrader: (22)

How do you know if your getting KR and/or detonation?

Colonel

Any diagnostic tool will show you KR. Most people use Autotap. If pinging is bad enough you can actually hear it.