Gering

I have an 07 Z51 A6 DD and have been using Brisk spark plugs "part number GOR15YTE-3" for a while. Over all they seem to work well. I was just wondering if anybody in the forum has seen a difference in performance; such as throttle response, hp/tq loss or gain, or smoother idle when changing to a different type of plug. Also does anybody on here use Brisk spark plugs, beside myself?

Thanks.

REVAK

Haven't tried Brisk plugs. I did find that by using a copper plug, 1 heat range colder [ngk tr6] , I could run a little more timing.

taken19

I just put the TR6's in my H/C full bolt on car and it does seem to run a bit smoother, even at idle. I won't find about the amount of timing I can for a couple weeks when I go back in for a tune.

Gering

Bill Dearborn

Haven't seen any need to change the plugs. My 03 had 43K miles on it when I sold it and it was running strong, still getting the same gas mileage it got with 5K miles and I saw no need to change. The 08 has 23K miles on the original plugs and I don't see any need to change those either. Still runs like a raped ape and gets great gas mileage. Don't fix it if it ain't broke.

Bill

taken19

I guess it depends on your current and/or future goals. I ran stock plugs with great results at 476 rwhp, H/C and all bolt ons except a FAST. In my recent research, it seems that the NGK plusg may work better with higher Hp cars. if yoou plan on staying relatively stock, the AC Delco plugs will do just fine. I only changed due to potential performance gains and/or reliability. I read somewhere that you need to go one step colder for every 100 Hp higher than stock you are. But again, it could just be an old wives tale...

FloydSummerOf68

I wouldn't be changing plugs on a car with only 23k miles either.

The OP is in a different situation than that.

TNTC4VETTE

That's a loose interpretation of a FI rule. I do run TR6s on my bolt-on car and it does great. Some have had trouble, including JayPlaySS2 IIRC.

taken19

Ronnie, thanks for the input. Hearing that another member thinks sililarly makes me feel more comfortable. Have you had any problems whatsoever with your TR6's?

Yeah, I was very reluctant to change myself based on some of the posts I have read. The car seems to pull more linear but I wont have any data until the dyno tunel. I kept my AC Delco plugs and will bring them to the tune just in case. Heck, there's only about 1000 miles on them...

The reading I did included opinions that the copper worked better for overall power. The debate came with a lower heat range. Some say yes, some say no. I can buy into the fact that the sharply pointed iridium tips of the AC Delcos could potentially retain more heat leading to detonation, so the switch to copper was the choice I made. The colder heat range was supported by some tuner recommendations on several other forums due to allowing more timing. But again, if the dyno doesn't show that, I will gladly switch back.

On a seperate note, my '95 F-body ran great with NGK plugs and was relatively stock - even at 105k when I got rid of it.

Swiftrider08

I have had two different tuners tell me to stay with the stock plugs.

Gering

Have any of you guys seen where it was necessary to tweek a tune inorder to maintain optimal performance when switching from one make/model of spark plug to another?

REVAK

My stock plugs ran fine, but I could not add any wot timing without getting knock retard. By using a copper plug, one heat range colder, I can add 1.5 to 2.0 degrees timing, no knock retard, throttle response is better. But to reiterate, at stock timing , I had no problems with the stock plugs. Also if you live in an area that does not have 93 octane, The colder, copper plugs buys you a little margin for staying out of K/R. Either way , we are still talking about a slight difference.

Katech_Zach

Our recommendation is Denso Iridium spark plugs. IT20s are identical to LS7 plugs and they can be purchased cheaper in the AC Delco box. For racing or boosted applications we use Denso IT22s.

Gering

So do you think the IT16 would be a good plug for me to try per this chart for my 07 Z51 A6 with a mild Head & Cam?

http://www.densoiridium.com/find_part.php

099blancoss

Plug mfg gap them differently .... like a NGK tr 55 might be gapped at .051 and a denso might be a .045.. but the tune should not have to be tweaked its all about the correct gap on the plug....

NGK are about the least expensive most effective plug, the expensive plugs last longer.. the car probably came with an ac delco 41-110...

you drop heat range for every 100 added hp is the general rule..
whether you spend $14 for a set or $114 for as set of plugs is up to you... copper based will not last as long but are 1/10 the cost.. as far as performance goes I have not seen a true independent test done yet and show improved gas mileage from one over another.. so to me its all about.. maintenance and personal preference

miami993c297

Hi jason,

What is the advantage/gain to switch from TR6 to IT22 on my 418ci 664hp please?

Christian

Gering

Thanks for all of the replies.

TNTC4VETTE

No problems whatsoever. I was having a lot of difficulty with burst knock and the car was pulling timing every time I went WOT with the stock plugs. No problems with either now. I ran the same TR6s on my GTO until I broke 800 to the tires, then I went to the BR7ES. When are you tuning?

taken19

My tuner has shown that to me during my past tunes. He called it tip in knock when he first hit the throttle. I'm tuning on 8/8/11, and I'm currently at 460/430 on his Mustang dyno and 476/424 on a Dynojet. Hoping to get +15/20 over my Formatto Stage II ported stock intake, but we will see. I'm hoping that the MAF screen delete, smooth bellows, NGK TR6 plugs and Ported FAST 102 will get me there.

Thanks again for the deal on the FAST and accomodations in shipping. I will let you know the dyno results as soon as I get them.

Sean

TNTC4VETTE

Anytime, Sean. By helping you, I helped myself a little bit.

Back OT, seems like a mixed bag, Gering. Small change if you're having issues, but sounds like nothing to reach for if you're not currently having a problem.