Backfire at high rpm

hellbred07 · February 23rd, 2009, 12:25 PM

I am got a KB INTERCOOLED KIT supposedly pushing 8psi boost gauge said 10psi still wondering why the real problem is i am getting a backfire or pop.pop, pop, at high rpm and it will continue to do this if i stay in it.Somebody throw something logical out there.

2006GTARPD3 · February 23rd, 2009, 12:28 PM

Learn some english. Logical enough?

Lol j/p man don't start flaming me

07 STROKER · February 23rd, 2009, 12:34 PM

fouled spark plug

hellbred07 · February 23rd, 2009, 12:34 PM

Sorry bro, didn't see that BS i just typed.DAM!

qwik48r · February 23rd, 2009, 03:13 PM

spark plugs for sure.. no way you pegged the maf already.

07 STROKER · February 23rd, 2009, 03:29 PM

everytime i see your avie all i can think about is the 3650 rebuild...

Trick Tuners · February 23rd, 2009, 03:33 PM

What is the AFR when it happens? You should always run a WO2 with forced induction. Is this with the KB tune? Are you sure its not detonation? (make damn sure its not!!). Here is some info on detonation.
Detonation Explained

qwik48r · February 23rd, 2009, 03:51 PM

Originally Posted by 07 procharger

everytime i see your avie all i can think about is the 3650 rebuild...

and promotion is fucking around with my order 07...

I guess they seam to think, education isnt as important as making money.. and yes I told them what I was doing.

I promise, as soon as it here it starts

hellbred07 · February 23rd, 2009, 04:03 PM

I am running the kb tune.Detonation making sounds in the back its not all the time either and happens in different gears,mostly second and forth. Maybe the plugs do need to be changed out,i am hoping that what it is.Calling KB and asking them anything can be a waste of time they make you even more paranoid.

TheUNZippee! · February 23rd, 2009, 04:06 PM

Better paranoid than destroyed engine.

qwik48r · February 23rd, 2009, 04:07 PM

you did pull them and close the gap down to around .030 didnt you? I assume its spark blowout. can you datalog your knock sensors? anything over 2* of KR on a blown car is BAD BAD BAD JU JU... it will destroy your motor.

qwik48r · February 23rd, 2009, 04:08 PM

Originally Posted by TheUNZippee!

Better paranoid than destroyed engine.

freaking AMEN and +1

hellbred07 · February 23rd, 2009, 04:25 PM

Plugs are regular gap where they have been.To explain things a little better i upgraded to the intercooled kit and had the A/F checked 11.6 -.9 was the highest seen,this was a custom tune for a non-intercooled kit that i had problems with till it was custom tuned. The shops tuner said it was fine(JUST A SHOP I WENT TO FOR A A/F CHECK) then as it got colder or whatever happened she started popping from the back. Noticed it when i dropped a forth and when i shifted to forth 2 separate times,i noticed it pulling of from a light wheels skidding in second,pop,pop,pop,pop.It seems to happen when she gets that stand in it kind of driving but gradually going into boost didn't hear anything.Now one day i did a blow by my buddy and he said it was sounding like fire crackers below the hood got the kb tune for the intercooled kit still popping.Idles fine, drives regular but i when i put my foot down it a coin toss.Could the plugs be damaged from the previous pinging and wouldn't that cause the car to idle weird.

qwik48r · February 23rd, 2009, 04:31 PM

sounds like spark blowout.

Anthony05GT · February 23rd, 2009, 04:54 PM

Get some Autolite HTO's and gap them down to .030 to .032

If you don't have a gapping tool specifically for our style plugs just put the plug in the plug socket and squeeze the gap down by putting it in a vise. Don't go too far because it's a bitch to try to open the gap back up.

Trick Tuners · February 23rd, 2009, 05:17 PM

Originally Posted by hellbred07

Now one day i did a blow by my buddy and he said it was sounding like fire crackers below the hood

That sounds like really really bad detonation!! You should get this fixed before you go wot. If you post up a datalog, i'll check it out for you.

hellbred07 · February 23rd, 2009, 06:01 PM

I just set an appointment to get her checked.Datalog i have a predator what am i looking for?

hellbred07 · February 23rd, 2009, 06:02 PM

Won't i hear it upfront and why now?

Trick Tuners · February 23rd, 2009, 06:05 PM

This is based on SCT stuff, but you should be able to figure out what diablo calls these pids. You should hear it up front. Cold air is more dense and can sometimes push the car over the limit if the tune is not setup properly, or on the very jagged edge.
Advanced SCT datalogging and Tune Analysis

qwik48r · February 23rd, 2009, 06:10 PM

I think a bump of about 5-10% in PE might cure it.. either that or just a few degrees out.. I have a feeling he running out of fuel

February 23rd, 2009, 12:25 PM	#1
hellbred07 Regular Join Date: Aug 2007 Posts: 425	Backfire at high rpm I am got a KB INTERCOOLED KIT supposedly pushing 8psi boost gauge said 10psi still wondering why the real problem is i am getting a backfire or pop.pop, pop, at high rpm and it will continue to do this if i stay in it.Somebody throw something logical out there.

February 23rd, 2009, 12:28 PM	#2
2006GTARPD3 Golf Pencil Kawk Juggler 2006 Mustang GT Join Date: Feb 2008 Location: Ny Posts: 2,084	Learn some english. Logical enough? Lol j/p man don't start flaming me __________________ Waiting for install..... Team Ricer GT Co-Founder

February 23rd, 2009, 12:34 PM	#3
07 STROKER MM's resident Juice head 07 Mustang GT Join Date: Nov 2007 Location: PA Posts: 7,931	fouled spark plug __________________ The MGW short throw shifter Its not just a shifter...It's a lifestyle!

February 23rd, 2009, 03:13 PM	#5
qwik48r MM Fanatic 2002 SS incredibly slow Join Date: Jan 2008 Location: in the woods Posts: 3,697	spark plugs for sure.. no way you pegged the maf already. __________________ turbocharged 2002 SS. 641rwhp @ 6700, pump gas. qwik's build

February 23rd, 2009, 03:29 PM	#6
07 STROKER MM's resident Juice head 07 Mustang GT Join Date: Nov 2007 Location: PA Posts: 7,931	everytime i see your avie all i can think about is the 3650 rebuild... __________________ The MGW short throw shifter Its not just a shifter...It's a lifestyle!

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February 23rd, 2009, 03:33 PM	#7
Trick Tuners Hardcore Enthusiast KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 2,790	What is the AFR when it happens? You should always run a WO2 with forced induction. Is this with the KB tune? Are you sure its not detonation? (make damn sure its not!!). Here is some info on detonation. Detonation Explained __________________ Learn about engine operation, detonation tuning, etc More good stuff on troubleshooting, tuning, etc

February 23rd, 2009, 04:03 PM	#9
hellbred07 Regular Join Date: Aug 2007 Posts: 425	I am running the kb tune.Detonation making sounds in the back its not all the time either and happens in different gears,mostly second and forth. Maybe the plugs do need to be changed out,i am hoping that what it is.Calling KB and asking them anything can be a waste of time they make you even more paranoid.

February 23rd, 2009, 04:06 PM	#10
TheUNZippee! Moderator 2007 Mustang GT 282 rwhp/292 rwtq Join Date: Jan 2007 Location: Canada Posts: 26,479	Better paranoid than destroyed engine. __________________ Team Ricer GT's Co-Founder Dan: NOT A PROBLEM. Crew Founder

February 23rd, 2009, 04:07 PM	#11
qwik48r MM Fanatic 2002 SS incredibly slow Join Date: Jan 2008 Location: in the woods Posts: 3,697	you did pull them and close the gap down to around .030 didnt you? I assume its spark blowout. can you datalog your knock sensors? anything over 2* of KR on a blown car is BAD BAD BAD JU JU... it will destroy your motor. __________________ turbocharged 2002 SS. 641rwhp @ 6700, pump gas. qwik's build

February 23rd, 2009, 04:25 PM	#13
hellbred07 Regular Join Date: Aug 2007 Posts: 425	Plugs are regular gap where they have been.To explain things a little better i upgraded to the intercooled kit and had the A/F checked 11.6 -.9 was the highest seen,this was a custom tune for a non-intercooled kit that i had problems with till it was custom tuned. The shops tuner said it was fine(JUST A SHOP I WENT TO FOR A A/F CHECK) then as it got colder or whatever happened she started popping from the back. Noticed it when i dropped a forth and when i shifted to forth 2 separate times,i noticed it pulling of from a light wheels skidding in second,pop,pop,pop,pop.It seems to happen when she gets that stand in it kind of driving but gradually going into boost didn't hear anything.Now one day i did a blow by my buddy and he said it was sounding like fire crackers below the hood got the kb tune for the intercooled kit still popping.Idles fine, drives regular but i when i put my foot down it a coin toss.Could the plugs be damaged from the previous pinging and wouldn't that cause the car to idle weird.

February 23rd, 2009, 04:31 PM	#14
qwik48r MM Fanatic 2002 SS incredibly slow Join Date: Jan 2008 Location: in the woods Posts: 3,697	sounds like spark blowout. __________________ turbocharged 2002 SS. 641rwhp @ 6700, pump gas. qwik's build

February 23rd, 2009, 04:54 PM	#15
Anthony05GT Enthusiast Join Date: Feb 2009 Posts: 764	Get some Autolite HTO's and gap them down to .030 to .032 If you don't have a gapping tool specifically for our style plugs just put the plug in the plug socket and squeeze the gap down by putting it in a vise. Don't go too far because it's a bitch to try to open the gap back up. __________________ '05 GT, Whipple, JBA, Zoomers, Centerforce, Metco, J&M, JPC, MGW, FRPP, BBR stage 2 billet cams, McLeod, Diablosport, LFP, Autometer, CDC, tuned by Kevin MacDonald NEED A TIMING CHAIN WEDGE? PM ME

February 23rd, 2009, 06:01 PM	#17
hellbred07 Regular Join Date: Aug 2007 Posts: 425	I just set an appointment to get her checked.Datalog i have a predator what am i looking for?

February 23rd, 2009, 06:02 PM	#18
hellbred07 Regular Join Date: Aug 2007 Posts: 425	Won't i hear it upfront and why now?

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February 23rd, 2009, 06:05 PM	#19
Trick Tuners Hardcore Enthusiast KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 2,790	This is based on SCT stuff, but you should be able to figure out what diablo calls these pids. You should hear it up front. Cold air is more dense and can sometimes push the car over the limit if the tune is not setup properly, or on the very jagged edge. Advanced SCT datalogging and Tune Analysis __________________ Learn about engine operation, detonation tuning, etc More good stuff on troubleshooting, tuning, etc

February 23rd, 2009, 06:10 PM	#20
qwik48r MM Fanatic 2002 SS incredibly slow Join Date: Jan 2008 Location: in the woods Posts: 3,697	I think a bump of about 5-10% in PE might cure it.. either that or just a few degrees out.. I have a feeling he running out of fuel __________________ turbocharged 2002 SS. 641rwhp @ 6700, pump gas. qwik's build