Hey georgia-SVT,

You may have been selling Denso's and working on Subaru but you don't know lightnings as well, yet. Don't take this as a slam, your new on here.

A lot of people are running the Denso's and like them. There was a chart on here that someone had and the Denso's showed they ran smoother than any other plug. We burn tips off of all kinds of plugs with our L, due to differnet programs.

I've ran my best time on Denso IT20's. I use NGK plugs in my GP1200R and had a Raptor 660 with them and changed them all the time because they are easy to get to. Seems like with the 2 stroke and 4 stroke engines, they are the best ones to use.

The L plugs are not that easy to swap them out all the time. I've ran both and I can feel a little miss with the NGK's at idle sometimes, I don't feel it with the Denso's.

 

I agree with DL
NGK's gave me an instant bad idle the second I started the truck up with them. Do a search, you'll see plenty from me about how much I hated them. Plus they only lasted 500 miles before 3 burned up. I switched to Denso IT-22's, took my 2-3 lb upper pulley off and went back to the track and ran 3/10's better than my previous best "with 2 less lbs of pulley" and the Denso's. Now it's been about 3k since I put in the denso's.

Do I believe in Denso's, YES I DO, enough to already have bought an extra set for next season.

I should say I know many have sucess with NGK's, "BUT" I don't.
I also don't mind the price of Denso's when you consider all it takes is for your motor to go lean for a few seconds, and if the plugs can't get that heat out of the cylinder fast enough, THE MOTOR GOES BOOM. There is no doubt the design of the IT-22 will take the heat out faster and better than TR-6's. I would consider NGK BR-7's if there wasn't so much idle and loading up problems with them BUT THERE IS.

here's that chart

 

You are correct I have just started learning about the Lightning. And maybe Denso IT-22's run better than the NGK are we compairing the same heat range plugs here.TR6's are a copper core plug ain't It-22's a iridium? I take no offensive I am new but there is alot I know about a boosted engine albeit on imports(don't shoot me). If you guys have been running a copper core plug in place of a Plantnum then no wonder they burn up fast.I know most of the racing Import world runs NGK does that mean they are better than Denso NO.Please don't flame me I'm new here but not to performance boosted engines. Although the chart that was posted did make Denso look good. Again are we compairing apples to oranges copper to a Iridium. There is a difference.I ran these in a 91 Chevrolet 350 TR4's and they did just fine but I am compairing a BIG apple to a Orange there. Years ago Toyota changed to Denso Platnium they were 6.99-12.99 each I would have to sell people the copper core replacements guess what happend they did not last any time and Idle sucked and so on.Maybe a TR6evx(if I remember corectly on the number) plug would be better although the 6 heat range is pretty hot a 7 would be better maybe that is another reason for the burnt plugs. If the Denso work then by all means use them I would like to see the Misfire chart done with the same heat range and electrode material you may be surprised.We all know Champion SUCK.
Jeff T.

 

Intresting topic.

I just fitted Denso IT 22s, Gapped at .40 as advised by a tuner. I run a 2 or 4 pound pulley setup. Someone mentioned they may break if you do not gap them with such and such tool. What gapping tool is that?

Thanks to anyone that replys.

 

Feeler guages = bad for iridium plugs, as they are both small and brittle. Anything placed inbetween the electrode and ground strap and used as a lever to widen the gap will likely break the electrode. You need to use a tool to grab the ground strap to make gap adjustments, something like this:

 

used a Jacobs spark plug gapping plier/tool? for this.. just curious.. also, if you are stock, does this matter as much.. no extra boost on mine, just refinements to the intake, TB and filter kit..
Dana

 

Thanks for the reply 2cool.
I used a small screwdriver to open them up a bit. However i did not pry it open against the electrode, just pushed it up using the side of the plug for leverage.

 

I doubt the plugs were defective..The denso's are far more better plug than the ngk's in the lightnings..2 things caused that issue ..Too much Timing for the fuel you were using (detonation),Or high boost levels..Get your tune corrected with the fuel your running and this won't happen,If your running high boost levels above 16# then switch to the IT24's...I have run as high as 27# of boost and have had NO problems with the Denso's As long as my tune was right...hope this helps....JL

 

NGK's suck. PERIOD. 3rd gear misfires were all too common. Switched to Denso IT22's and gained .15 second and 2 MPH in the 1/4 mile. No BS. Expensive yes. Worthwhile? Hell YES. I am not gaining anything from this post. Just relaying the truth.


BTJ

 

I have never ran faster going to a colder plug. I always run basically the same ET and a slower MPH going to a colder plug. This tells me that I'm not making as much HP on the big end.

I've tried this 3 different times it was very consistant. I used 2 different programs doing this with the same result.

The first time was with a 2# pulley and the last 2 times were with a 4# pulley plus 2 programs. One program had 21 degrees of timing and the other had 18 degrees of timing.

Jeff T., I agree with you about standard Denso's vs. NGK's in bikes. I tried Denso's twice in 2 different sportbikes and they sucked both times compared to NGK's.

The Iridium plug is what gives you the better idle not the plug brand. I tried the NGK TR5IX (7397) Iridium and got the smooth idle compared to standard plugs. The TR5IX is really not the same as a TR5. It is more like a TR6. The burn on the plug was the same as the TR6 as well as the MPH. The standard TR5 was about 1 MPH faster on the big end compared to the TR6 or TR5IX.

The bonus about NGK Iridiums is they cost about $50 at Carquest or O'Rielly's.

 

I agree that we are going no where with the plug issue I check to see what NGK showed for our trucks TR6 copper core retarded on NGK's part Platnuim for platnuim period. Thats is why the Denso are working better.Sorry for hijacking this thread 2cool I learned one of the hot spots of this message board.No hard felling if I had spent 1 1/2 hours installing plug and then it ran like crap i'd be ticked also. Hey at least I did not post that my Chevrolet was better than your Ford. It's all good.
Jeff T.

 

georgia-SVT,

LTNBOLT is one of the guru's around here on plugs.

Hey Chuck, What plug are you running now? I need to change mine soon, race season is almost here..

Hey georgia-SVT, We're all cool here...

 

I know that's is one of the reasons I bought a Lightning.
Jeff T.

 

Plug wars part 2