Unfinished tune , at 1110rwhp still problem solving
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Launching!
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From: AUSTRALIA
Unfinished tune , at 1110rwhp still problem solving we started tuning today all day , and are having issues at top end of run engine is a warhawk 403ci et ls7 6bolt heads , vortec ysi supercharger . we are trying everything and trying to figure out this issue at the top of the run . we are using a specific brand of race fuel which ive noticed that its very corosive on paint tomorow we will try a 50/50 mix , our problem might be fuel related , any thoughts on this delema would be very much appreciated ill post a dyno reading thanks
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Launching!
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From: AUSTRALIA
Thread Starter
Launching!
Joined: Jan 2008
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From: AUSTRALIA
shawn thanks for your quick responce . my tuner does not seem to think its valve train related , we have the tripple springs the middle being a dampener, the valves are stainless steel supplied from ET . We are using yella terra rockers which they made to suite the ls7 head. we believe this engine should go to at least 7000. We are using the factory pcm tuned in efi live coils are ls7 run with 1000cc injectors and a driver box . the fuel is a 110 ron . THE top end of run seems to blow black smoke . I see alot of guys running 1000+ are using aftermarket pcu ''s . Could this be our problem , maybee the fuel isnt burning correctly due to not enough spark discharge. WE have tried all spark plug gapping but it does not affect this missfire . My question is at what point does the factory ignition system start to fail . WE can only try other alternatives , i guess its always a trial and test situation and more $$$ But if there is hope out there it would be much appreciated .
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From: Cecil County Raceway!!!
shawn thanks for your quick responce . my tuner does not seem to think its valve train related , we have the tripple springs the middle being a dampener, the valves are stainless steel supplied from ET . We are using yella terra rockers which they made to suite the ls7 head. we believe this engine should go to at least 7000. We are using the factory pcm tuned in efi live coils are ls7 run with 1000cc injectors and a driver box . the fuel is a 110 ron . THE top end of run seems to blow black smoke . I see alot of guys running 1000+ are using aftermarket pcu ''s . Could this be our problem , maybee the fuel isnt burning correctly due to not enough spark discharge. WE have tried all spark plug gapping but it does not affect this missfire . My question is at what point does the factory ignition system start to fail . WE can only try other alternatives , i guess its always a trial and test situation and more $$$ But if there is hope out there it would be much appreciated .
whats your spring pressure (seat and open)? I would go into pretty bad float and mine would be very rich too...
Just because you have double springs + damper doesn't mean you're controlling the valves
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Launching!
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From: AUSTRALIA
Today we set up car for a road tune , therefore we changed our injectors to 65 mls and backed off our boost by 4 psi and run it on the dyno and did not see any issues at the same rpm range as the max hp tune . WE think it could be ignition related . checked the plugs and they are all fine . But when we were tuning for max hp we are constantly changing plugs .
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From: Rockfield Kentucky
I don't think that it's valvetrain related. It seems to happen at the same boost not the same RPM.
Looks like the fuel and or spark is not supporting the cylinder pressure.
Might want to try, better fuel or close the gaps up in the plugs and se if you get any change.
You said it blows black at the top of the pull. Too much fuel will also do what you are seeing. Lean it out a bit at the top and see if that makes any change.
Good luck!
Robin
Looks like the fuel and or spark is not supporting the cylinder pressure.
Might want to try, better fuel or close the gaps up in the plugs and se if you get any change.
You said it blows black at the top of the pull. Too much fuel will also do what you are seeing. Lean it out a bit at the top and see if that makes any change.
Good luck!
Robin
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Thread Starter
Launching!
Joined: Jan 2008
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From: AUSTRALIA
I don't think that it's valvetrain related. It seems to happen at the same boost not the same RPM.
Looks like the fuel and or spark is not supporting the cylinder pressure.
Might want to try, better fuel or close the gaps up in the plugs and se if you get any change.
You said it blows black at the top of the pull. Too much fuel will also do what you are seeing. Lean it out a bit at the top and see if that makes any change.
Good luck!
Robin
Looks like the fuel and or spark is not supporting the cylinder pressure.
Might want to try, better fuel or close the gaps up in the plugs and se if you get any change.
You said it blows black at the top of the pull. Too much fuel will also do what you are seeing. Lean it out a bit at the top and see if that makes any change.
Good luck!
Robin
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hawk i don't thing going to cdi is going to help
just have a look at what kurt from ex w2w did with truck coils-3-5 years ago (from memory)
6.80 +200mph something
doubt you are going to make 1500+ hp on the street with that blower anyway-
not putting you down,just telling you the way it is
sometimes the simple things just work-
just have a look at what kurt from ex w2w did with truck coils-3-5 years ago (from memory)
6.80 +200mph something
doubt you are going to make 1500+ hp on the street with that blower anyway-
not putting you down,just telling you the way it is
sometimes the simple things just work-
Thread Starter
Launching!
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From: AUSTRALIA
WE are using the ls7 coils , Have tried the truck coils , but no difference even played with dwell setting . WE are using a projected plug tr6 . tried many plug gap sizes . Even a non projected but the projected seems to work better. Could this misfire be caused due to detonation .Hope fully we find the problem before the problem finds us .
Thread Starter
Launching!
Joined: Jan 2008
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From: AUSTRALIA
hawk i don't thing going to cdi is going to help
just have a look at what kurt from ex w2w did with truck coils-3-5 years ago (from memory)
6.80 +200mph something
doubt you are going to make 1500+ hp on the street with that blower anyway-
not putting you down,just telling you the way it is
sometimes the simple things just work-
just have a look at what kurt from ex w2w did with truck coils-3-5 years ago (from memory)
6.80 +200mph something
doubt you are going to make 1500+ hp on the street with that blower anyway-
not putting you down,just telling you the way it is
sometimes the simple things just work-
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Ive read many posts with hi horsepower turbo applications where kurts name is present . He is a well respected guy in the ls -x based tec stuff . hope he can answer my questions . I read alot off the hi hp applications on this forum use after market computers like bs3 i think , is that what kurt used with the truck coils . Im no comp wizz but maybee that system powers more volts to the coils or something.
what happens when you take the aftermarket injector drivers off the factory pcm-does it still do it or they have not done that-
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Launching!
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From: AUSTRALIA
As far as ive been told they have taken 4psi near on by restricting the ysi intake and all is well but less hp off coarse. now we are using 65 ml injectors but running high pressure .
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From: Rockfield Kentucky
The problem is when you get over certain power level it becomes a lot more difficult to sort out a probelm like this.
I have seen some of the turbo guys switch away from the reluctor wheel because they were losing signal. It may have been a result of deflection at a given power level.
I asked earlier if it had too much fuel at the top. What is the A/F ratio when it starts to miss?
TR6 ...isn't that a hot plug? In that type of setup I would go to a very cold plug such as a 10. We never run a projected tip in the high horsepower deals. They act like glow plugs sooner or later.
Does the strap shop any heat like it's starting to melt?
Robin
I have seen some of the turbo guys switch away from the reluctor wheel because they were losing signal. It may have been a result of deflection at a given power level.
I asked earlier if it had too much fuel at the top. What is the A/F ratio when it starts to miss?
TR6 ...isn't that a hot plug? In that type of setup I would go to a very cold plug such as a 10. We never run a projected tip in the high horsepower deals. They act like glow plugs sooner or later.
Does the strap shop any heat like it's starting to melt?
Robin
Thread Starter
Launching!
Joined: Jan 2008
Posts: 238
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From: AUSTRALIA
The problem is when you get over certain power level it becomes a lot more difficult to sort out a probelm like this.
I have seen some of the turbo guys switch away from the reluctor wheel because they were losing signal. It may have been a result of deflection at a given power level.
I asked earlier if it had too much fuel at the top. What is the A/F ratio when it starts to miss?
TR6 ...isn't that a hot plug? In that type of setup I would go to a very cold plug such as a 10. We never run a projected tip in the high horsepower deals. They act like glow plugs sooner or later.
Does the strap shop any heat like it's starting to melt?
Robin
I have seen some of the turbo guys switch away from the reluctor wheel because they were losing signal. It may have been a result of deflection at a given power level.
I asked earlier if it had too much fuel at the top. What is the A/F ratio when it starts to miss?
TR6 ...isn't that a hot plug? In that type of setup I would go to a very cold plug such as a 10. We never run a projected tip in the high horsepower deals. They act like glow plugs sooner or later.
Does the strap shop any heat like it's starting to melt?
Robin