Spark Blowout?

[Obsol3te]

Anyone experience spark blowout before?
The past couple months if I go WOT it seems like the car is misfiring up until redline. The car feels down on power during this time as well. I make a few more WOT passes and it clears up and the car is back to running normal. I sent Lund a couple logs asking about what the issue would be and theyre pointing to spark blowout. If that were the case, why would my issue get better over time?
Plugs were 1 step colder NGK's gapped to whatever KB recommended. It was somewhere between .030-.035, can't remember.
Is Lund blowing smoke again? I had a similar issue with their tuning before when I was N/A.
I was having knock activity after an LT header install/tune. I ended up buying an oil separator, torco and went on an endless search for some type of exhaust rubbing. Turns out it was their tune the entire time, and they had a revision and the issue was fixed.
Really really debating just swapping to Ken Bjonnes in the spring...

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[turbo50]

Check for leaks. You shouldn't see and a spark blowout with iridiums till your over 20lbs or if your running e85 but I run .028 for gap

 

[Agent_S550]

Check for leaks. You shouldn't see and a spark blowout with iridiums till your over 20lbs or if your running e85 but I run .028 for gap

Agreed. Spark blowout is more characteristic of the older modular motors. Most coyotes don't have an issue. However, Blow out can't be seen on a datalog most of the time.

 

[Brian Z.]

Check with Travis at Boostworks. There have been some throttle body issues with a small sampling of KB's and that might be causing your issue. I'm trying to work through a similar issue (but might not be the same) and have a new TB on the way to see if that cures it.

 

[Tommy V]

Have u had a cel light come on when the car was misfiring?If your gap is at .35 i would take them down to .30 and see if that helps.My car did the same thing but when i set my plugs instead of setting them to .30 i had them at .40.The car SOMETIMES ran like crap and break up all the way through the rpms.Would not hurt to check them.Also i like to just pull up my a/f for both banks and look only at them to pids on the log to look for differences.

 

[11secls1]

I had this, same symptoms, colder plugs--> problem solved.

 

[Roh92cp]

I'd say try closing the gap first to .28

 

[RockStang]

I had blowout or so we suspected with my PC D1 running 15ish psi. Those plugs were gapped to .032 then. Now on a Whipple they recommended .028 on the Brisk plugs. I would take it down some and see what happens.

 

[wildcatgoal]

For what it's worth, from my Subaru days... a friend of mine's built car (big turbo, etc.) was diagnosed with this and he was told to close the plug gap incrementally by .002. It went away entirely after a few adjustments. Subsequently did some kind of tune adjustment that apparently was necessary given the change. Still stayed away.

 

[Obsol3te]

Check with Travis at Boostworks. There have been some throttle body issues with a small sampling of KB's and that might be causing your issue. I'm trying to work through a similar issue (but might not be the same) and have a new TB on the way to see if that cures it.

I originally messaged him, but he's been really hard to get ahold of lately. He responded to my initial email, but then when I got the datalogs he requested, i sent them his way and havnt heard from him since.

Have u had a cel light come on when the car was misfiring?If your gap is at .35 i would take them down to .30 and see if that helps.My car did the same thing but when i set my plugs instead of setting them to .30 i had them at .40.The car SOMETIMES ran like crap and break up all the way through the rpms.Would not hurt to check them.Also i like to just pull up my a/f for both banks and look only at them to pids on the log to look for differences.

No CEL at all whatsoever. I'll pull the plugs this weekend and see if I can close the gap to .030. When yours ran like crap, did the issue clear up though? Im 100% serious this is the case all the time, that after a few pulls it goes back to losing traction in 3rd and now with this colder weather, 4th.
I have the logs on my pc from an SCTx4 if anyone else here that knows how to read them cares to look.

I had this, same symptoms, colder plugs--> problem solved.

Running 1 step colder NGK's. Can't remember the P/N though.

Also, I've never tried closing the gap on a plug before. Only gapping them. Can't imagine it's overly difficult, i'll try youtubing that one

 

[Tommy V]

[CODE[/CODE]

I originally messaged him, but he's been really hard to get ahold of lately. He responded to my initial email, but then when I got the datalogs he requested, i sent them his way and havnt heard from him since.




No CEL at all whatsoever. I'll pull the plugs this weekend and see if I can close the gap to .030. When yours ran like crap, did the issue clear up though? Im 100% serious this is the case all the time, that after a few pulls it goes back to losing traction in 3rd and now with this colder weather, 4th.
I have the logs on my pc from an SCTx4 if anyone else here that knows how to read them cares to look.



Running 1 step colder NGK's. Can't remember the P/N though.

Also, I've never tried closing the gap on a plug before. Only gapping them. Can't imagine it's overly difficult, i'll try youtubing that one

Yes my car would run terrible sometimes and then sometimes it ran good,thing is,when i say it ran good,it just was not breaking up real bad.After i regapped the plugs the car ran alot better,even better then when i thought it was running good lol.

 

[olaosunt]

Hey Boss.
Not sure if we have the same issue .
My KB runs great @15 psi -4 inch puley and make a ton of power on E85 .
Tune is adding timing to 21*@WOT.
As soon as I swapped to 3.5(19-20)seeing bigtime knock .
Checked the gas -E85 and use same tank with both pulleys .
Can't find a source of false knock so going to be swapping from the 6510 NGK's to a Brisk 12S (which are a step colder ) to see if related ..

I know you are not running that much boost and Jon (jr) told me had run up to 25 psi with the NGK's with a small gap.

I think the world of Jon sr. but jr is super responsive -never taken more than 24 hours to respond to my logs .
Yesterday I send him the log of the knock @1700 and he responded by @1900.!

 

[JadedGT]

I had blowout when I didn't change the plugs. Once I got any where near 5K car would just cut power. Changed plugs problem went away.

 

[Obsol3te]

Going to remove the blower and get to plugs this weekend and take a peek.
I'll letcha know the outcome, hopefully its something as stupid as a regap

 

[Terminator2]

Seen in many times over the years tuning turbo cars. Your issue does sound like spark blowout to me. It can get better as the car gets hot but it is still doing it most likely. Check gap and close by 0.002" until it clears up. We would gap at 0.035" at 15psi, 0.032" at 20psi, 0.030" at 25psi, 0.028" at 28psi and 0.026" at 30psi.

Wrong heat range plugs or weak/bad plugs can cause as well.

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