ok guys with all the mods on my car i still have the stock platinum plugs
what are the best plugs for our cars???

anyone do any dyno testing on these???

will they make a dig difference in performance??

 

I've been using the Bosch Platinum +4 spark plugs in my 99' Z28 1LE. I love em'. They did smoothe out the idle a little bit. I went with them because they are a better quality plug than the NGK's. The "+4's" are a little pricey, but worth it. Plugs are vital to performance on any engine. The nice thing about these is that they have 4 electrodes instead of one or two, and the eliminate the guessing of gapping.

 

I also have the Bosch Platinum +4's and I love them. They are awesome spark plugs. Many people say NGK's and that's what most people put in their LS1. They are cheaper, but I would go with the +4's if you have the 30 extra bucks. They are really good spark plugs.

 

I run TR55's gapped at .050.No copmplaints <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Slowhawk:
<strong> I run TR55's gapped at .050.No copmplaints <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I agree. You can't beat the conductivity of copper. But, if long life is what you're after then platinums or iridiums are fine.

Hey, question for you guys (and yes, I already know the answer)... How many sparks does a spark plug make when it has 2 side electrodes instead of just 1? How about if it had 10 side electrodes? ...The answer is one. That's why Splitfire plugs are nothing but a gimmick.

Something to think about when you're shelling out the big bucks for that "FIRESTORM OF POWER!!!" <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" />

 

Colonel: How many bullets can a gun that fires one bullet/sec fire in one second? One. How many bullets can four of this same gun fire in one second? Gee, I think the answer is FOUR. Therefore, the spark can travel the most efficient path, and deliver a longer more powerful spark. <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" />

 

Don't forget the more "Sides" to your electrode, the less clear area for the spark itself.

I had +4's and they seemed no better or worse than stock. But I got some misfires on idle. Rougher idle. I went for +4's because I did not want to change plugs ever again. Heard horror stories of how hard a LS1 plug change was.

Anyways, I am now running NGK TR55s and think they are great. Better idle also.

Changing plugs takes no longer than 1 hour if you follow the instructions on installuniverisity.com.

Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 30TH_TA:
<strong> Colonel: How many bullets can a gun that fires one bullet/sec fire in one second? One. How many bullets can four of this same gun fire in one second? Gee, I think the answer is FOUR. Therefore, the spark can travel the most efficient path, and deliver a longer more powerful spark. <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Funny but not a good analogy at all since you're still going to have but ONE spark regardless. That one spark is going to do the same job no matter which of the 4 electrodes it fires from (it'll likely favor one most all of the time.)

Like was just mentioned, the more open the plug is, the better flame front the charge sees. Here's an old hotrodder's trick to illustrate the point...

Want a few extra ponies for just one run at the possible sacrifice of your ignition? Try cutting the side electrodes OFF. Yes, that's right, off. You'll also need to drop the timing advance back a couple of degrees to make up for the faster onset of combustion. If you have enough electrical power behind your plugs then the engine will still run. Push the car to the line as to stave off fouling and ignition failure. You should see a little extra HP. This is a very old trick used sometimes by those wishing to push across that next barrier when it's so close they can taste it. The reason it works is because you signifigantly increase the exposed area of spark to the fuel/air charge. Likewise, decreasing this area can only serve to decrease power.

Having said that, I think I'll be sticking with ONE electrode since the spark will only travel from one at a time anyway. <img border="0" alt="[burn out]" title="" src="graemlins/gr_burnout.gif" />

 

I would have to agree. With the +4's, the spark sould only jump to the path with least resistance. So only one of the 4 tips should be getting used.

 

From what I've seen, Bosch +4s are ****. We've tried them on a couple of our club cars and all they've done is increase misfires at idle. I have no use for them.

I have yet to find a plug that works better in an LS1 than NGK. We've tried a few.

I use NGK TR55s gapped at .059 on my B1 cammed car, and I never show any more than single digit misfires per cycle per cylinder at my 800rpm idle.

<small>[ March 20, 2003, 07:38 PM: Message edited by: RPM WS6 ]</small>

 

Another trick I use is round the tip of the ground strap.This can cut down hot spots and get a better fire.This is just theary on LS1's but worked great on my street bikes that revved to 14,000rpm with 14-1 compression and 93 octain gas <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

Another old trick is to mark with a pen on the ceramic the area that is opposite the side electrode so you can position each plug so as the spark is exposed to the centermost area of the combustion chamber. You will need some shims to get the correct tightening on most plugs.

 

ive heard a few people talk about the silverstone beru's i think they are called. what about them?

 

From working at autozone, I can personally tell you that the bosch plugs are crap <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> We had NUMEROUS customers bring them back after a day or two, the ceramic was cheaply made, and the plugs just sucked, people said thier cars ran worse. I'll stick to my NGK TR55's PLEASE <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

NGK TR55's gapped @ .055!
Noprob's @ all!
Tried the Bosch in my LT1 Vette & hated them!
My .02!

 

Have ran most all brand name plugs at one time or another. Have had the best luck with ngk's not just in my ls1 but also in several low 9 second alcohol burning small block chevy's. The ngk's just seem to hold up better and are more predictable. Have lost 2 tenths or more et when I have change to a different brand in my all out drag cars. ngk's they work

 

go with the ngk tr6 gapped at .045

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by RPM WS6:
<strong>
I use NGK TR55s gapped at .059 . </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Anyone know the Part # for these, and how do you gap them bastards?

 

i have the bosh +4 and have noticed no problems.. the block does run hotter in stop and go traffic, but runs great.

 

I've had NGK TR55's on my LS1 for about 12K miles now with no problems. The +4's are a waste of cash in my opinion, what are they like $6 a pop? No thanks, but different strokes for different folks...