ok now... the car is riding perfect, but when i step on it and hit full boost(21psi trifecta tune) some times the car just STOPS boosting.... it sound like if i let off the gas completely and im still WOT.... any idea wat could be???

 

You mean it sounds like your revs are dropping back to idle or is it a temporary loss in power?

 

I would cut back on the NAWZ you could blow the welds on the intake. Jk

Sounds like spark blowout.

 

i put in the zex one step colder plugs and it still did it... i have the stock ones now and it still does it...

 

Misfire perhaps? Does the CEL flash at you?

 

Oh that's just because your tune expired. You just need to renew it.






































jk Yeah, any CELs?

 

it could be the fuel did you upgrade your fuel pump to support the 21psi and also the injectors

 

you should dot have to upgrade a fuel pump on a sub 370whp DI car. It flows plenty of fuel

 

WHY!?

Stock new plugs!

You don't need colder plugs in an LNF.

This isn't an LSJ, stick to the stock gapped, OEM ACDelco IRIDIUM plugs

 

Any CELs? If not there will be soon I would think.

 

there is cels but i cant read them...

 

Go to autozone and have them read so we can help you.

 

yeah ill do that, unfortunally the closer autozone there is around here is about 40 minutes away...

 

Do you have onstar?

 

dont have it activated it... why?

 

yea....iridium's love heat, they do such a good job at control and dispersal :sigh:

 

It seems that most who have changed their plugs to other than stock plugs have had issues.

 

a colder plug is just that, a range colder, they handle and generally disperse heat at a higher rate as well as the electrodes being a copper base, to once again cool more effectively.

if your running into a stumble issue, ect. with them, i'd suggest playing with the gap as you can not yet control the dwell of the packs.

in my past workings with the zex plugs, a more aggressive dwell was required to make the car and plug happy, once it was working it allowed a more aggressive timeing curve due to the heat control.

playing with gap will simulate base dwell by encouraging the plug to fire fractionally earlier.

also, a retracted tip plug will cut down on the chance of over heating the base electrode and dripping it into the cylinder, as well as providing an unlimited amount of possible grounding points for the spark to ark to.


injection type be dammed, with the cylinder pressures during combustion at +21psi-g, you still making heat.

 

Iridium plugs are actually really good plugs. The problem with them has nothing to do with heat, they disperse heat just fine. The problem is that it can be hard to prevent spark blowout on them when used under extremely high compression. The gap has to be closed up quite a bit to prevent spark blow out but then that causes the car not to run as good at idle and normal driving.

 

iridium's are known for there poor performance in high heat. its simple.

they are great for high millage and such, due to the temps at which they fire.

While you gain durability, at the same time you lose spark energy and heat transfer due to

their high electrical and thermal resistance. The more spark energy you have, the more

power your engine can make. Likewise, the faster the plug can transfer heat, the better it

can resist engine damaging detonation

 

What kind of plugs and gap do you recomend?

 

I had nothing but misfire issues with the o.e. iridiums, I've since switched to the new denso TT, platinum twin tip plugs, gapped at .33 and the car loves it. any larger gap and the car would bog between my 2-3 shifts since, but the regap it's beautiful, and I am Trifecta tuned also. As far as the densos, advance autoparts is the only store I can find that currently stocks them.

 

The ACDelco platinums I ran in my LNF caused the car to misfire(wouldn't rev past 4k, like there was a two step there).

IIRC GM had the same issues with the first LNFs, then they changed them to iridiums.

I didn't say a damn thing about how they are better in any way shape or form.

I know I changed back to the OEM plug and voila, misfire problem gone.