Plug Gap

Paul1981610 · Jul 24, 2014

01 gt Saleen series one with intercooler smaller pulley 24lb injectors. No boost gauge yet. Having rich issues at WOT. presuming blow out. I am gapped at .035. Should I go smaller gap

restomod66 · Jul 24, 2014

Supercharged applications require specific plugs with a different heat range (cooler) and tighter gaps. If my memory serves me correctly I ran NGK TR6's gapped @ .032 on my Supercharged 01 Cobra a number of years ago, it ran smooth as a stocker.

Gearbanger 101 · Jul 25, 2014

Had the same plugs and gap in my 4.6L Supercharged Cougar XR7. Made 10psi and ran like a clock.

Deleted member 38176 · Jul 25, 2014

The greater the boost, the smaller the gap. Seeing that you are running a Saleen blower (probably the worst possible blower ever made), you are probably barely breaking 300rwhp. Your gap is not an issue. It is the tune that is running rich. Do you have a wideband?

Paul1981610 · Jul 25, 2014

Well I did t have this issue until I changed plugs. The tune never changed. And thanks for telling someone that their supercharger is terrible. I'm a low budget guy and proud I even have one. And no no gauges at this point

stangr5oh · Jul 25, 2014

I do not think he meant anything toward you when he announced his opinion toward the charger on your car. But if the tune has not changed, and as we spoke before about this in your other thread, I would change out those Bosch plugs. I am telling you from experience, they are garbage when it comes to our applications. As they mentioned above, go to another plug, NKG or Autolite. The gap is smaller when it comes to chargers. The gap on yours should be .032, over time it will expand to about .035.

Paul1981610 · Jul 25, 2014

I installed Autolite 103 last night gapped at .035 and it is way better but just not quote right. Still blowing at high boost. Going to regap again

stangr5oh · Jul 25, 2014

How long ago did you dump that SeaFoam in your tank? And are you still running on that same tank of fuel? I would tend to believe that if you are still on that same tank or next refill, you are seeing that the SeaFoam after effects of all the carbon blowout.

Paul1981610 · Jul 25, 2014

Prolly 6 tanks. I use 93 non ethonal

Paul1981610 · Jul 25, 2014

It's not just smoke blow out. It actually sputters or loads up at high boost. All the old plugs were sooty. Has to be spark blow out IMO. But that's why I'm here getting other opinions

stangr5oh · Jul 25, 2014

Well re-gap them to .032 and also make sure your COP boots are in good condition. After time and heat exchanges continually the COP boots get hard and cut or rip very easily. So when you re-gap the plugs, look closely to each boot and if any are hard and and you suspect a tear or crack rip whatever you want to call it, replace them. They are cheap at any auto store, and I experienced stumbling on my Mark VIII last year and I had 2 boots cracked causing the spark to arch off the block. After fixing them, it purred like a kitten.

Paul1981610 · Jul 25, 2014

Will do

Kilgore Trout · Jul 25, 2014

I would not put Bosch or Denso in my lawn mower much less my car.

Gearbanger 101 · Jul 25, 2014

Paul1981610 said:
It's not just smoke blow out. It actually sputters or loads up at high boost. All the old plugs were sooty. Has to be spark blow out IMO. But that's why I'm here getting other opinions

You wouldn't be blowing spark blow out with that little blower. There are guys running twice the boost you are that aren't experiencing spark blow out.

Paul1981610 · Jul 25, 2014

Give me some more ideas

sneaky98gt · Jul 25, 2014

How do you know it's going rich at WOT? Are you looking at it on a wideband? Contrary to most folks' intuition, spark blowout actually reads lean on a wideband. That's because the wideband is an oxygen sensor, and not a fuel sensor. Fuel not burning due to the spark blowout results in oxygen not being consumed, and thus a lean condition registered by the O2 sensor.

OP, buy a set of NGK TR6s. Last set I bought was only like $13 for the set. Gap to .030. If you still have problems, the spark plug isn't likely the issue.

Paul1981610 · Jul 25, 2014

As noted in my MAF thread that I realize I should have stuck with. Car was running good just a little low rpm (under 2k) stutter. Had gears installed came home cleaned MAF and installed speedo cal. Took it out and ran like crap in boost. Blowing black smoke and jerking. Thought I had screwed up MAF. bought a new pigtail and MAF. Still the same but not quite as bad. Realized since I am new to superchargers the plugs I had installed were garbage. Bosch platinum +4. Installed a week ago. So I pulled them and installed Autolite 103 gapped at .035. It is much better but still black smoking at high boost. My thought was with the Bosch multi tip and a dirty MAF it was fine. But now with a clean good reading MAF the Bosch just didn't work. Could I have messed up the ECM with the speedo cal. The ECM is flashed by Saleen.

Paul1981610 · Jul 25, 2014

I removed the speedo cal just to make sure but to no avail

stangr5oh · Jul 25, 2014

The ECM should recalibrate on its own the stock parameters unless you has a tune. But you may want to try and disconnecting the battery for 30 sec. and then reconnect and see if that makes a change, I am just throwing that out there as a maybe, but then again it may do nothing.

Paul1981610 · Jul 25, 2014

If you have a tune and disconnect a harness it can't "untune" can it? I mean the ECM can't store multiple tunes ie stock or tune right

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