Boost problem, cutting out real bad, need help!!!!!!!!!!!
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Staging Lane
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Joined: Jun 2007
Posts: 72
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From: Peachtree City, Georgia
Boost problem, cutting out real bad, need help!!!!!!!!!!! Well long story short i put a Aem Tru boost controller on the car to bump the boost from 6 pounds to around 8-9 pounds of boost, it runs great on 6 pounds it doesn't cut out going into boost its real smooth, anyways i took it to get re tuned and dyno'd on 8-9 pounds well anything over 6 pounds of boost it starts to cut out real bad, im stumped i put new tr6 plugs and gapped them to .030, put some different plug wires, checked all the grounds and couldn't find anything, any help or opinions would be great thanks for any help!!!!!!!!
All the specs to the car are in sig....
All the specs to the car are in sig.... Well long story short i put a Aem Tru boost controller on the car to bump the boost from 6 pounds to around 8-9 pounds of boost, it runs great on 6 pounds it doesn't cut out going into boost its real smooth, anyways i took it to get re tuned and dyno'd on 8-9 pounds well anything over 6 pounds of boost it starts to cut out real bad, im stumped i put new tr6 plugs and gapped them to .030, put some different plug wires, checked all the grounds and couldn't find anything, any help or opinions would be great thanks for any help!!!!!!!! All the specs to the car are in sig....
All the specs to the car are in sig.... Thread Starter
Staging Lane
iTrader: (3)
Joined: Jun 2007
Posts: 72
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From: Peachtree City, Georgia
Yes you could call it a mis-fire, I have a racetronix fuel pump with the hot wire kit, on the dyno the fuel pressure was dropping about 8-10 pounds he said thats a big drop but should be able to get it to run fine on 8-9 pounds not sure if he was right or not.
its fuel or spark.....
have your tuner check spark dwell settings.... gap your plugs a little smaller... check connectors for coil power...
check fuel pressure during the runs... make sure your injectors are large enough (check duty cycle)
************************************************** ******
also what valvesprings are you running???? could it be valvefloat???
have your tuner check spark dwell settings.... gap your plugs a little smaller... check connectors for coil power...
check fuel pressure during the runs... make sure your injectors are large enough (check duty cycle)
************************************************** ******
also what valvesprings are you running???? could it be valvefloat???
It should stay the same, or go up per lb. of boost with a Boost regulated fuel pressure regulator. Do you have a Fuel pressure regulator? Which fuel pump you running?
Thread Starter
Staging Lane
iTrader: (3)
Joined: Jun 2007
Posts: 72
Likes: 0
From: Peachtree City, Georgia
its fuel or spark.....
have your tuner check spark dwell settings.... gap your plugs a little smaller... check connectors for coil power...
check fuel pressure during the runs... make sure your injectors are large enough (check duty cycle)
************************************************** ******
also what valvesprings are you running???? could it be valvefloat???
have your tuner check spark dwell settings.... gap your plugs a little smaller... check connectors for coil power...
check fuel pressure during the runs... make sure your injectors are large enough (check duty cycle)
************************************************** ******
also what valvesprings are you running???? could it be valvefloat???
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Thread Starter
Staging Lane
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Joined: Jun 2007
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From: Peachtree City, Georgia
Well for some reason it looks like the wideband shows very rich 10.0 and it maxes out on the rich side of the guage, going up the street my friend said he saw flames coming out of the exhaust when it started to misfire, then i drove back by were it started to misfire and there were black exhaust marks on the asphalt from the exhaust dump, so i guess that would mean very rich right?
Well for some reason it looks like the wideband shows very rich 10.0 and it maxes out on the rich side of the guage, going up the street my friend said he saw flames coming out of the exhaust when it started to misfire, then i drove back by were it started to misfire and there were black exhaust marks on the asphalt from the exhaust dump, so i guess that would mean very rich right?
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Well for some reason it looks like the wideband shows very rich 10.0 and it maxes out on the rich side of the guage, going up the street my friend said he saw flames coming out of the exhaust when it started to misfire, then i drove back by were it started to misfire and there were black exhaust marks on the asphalt from the exhaust dump, so i guess that would mean very rich right?
Yep. 10:1 is probably the bottom limit of the sensor so I bet it's richer than that. lean it out some and you'll see the money.
Assuming a f-body tune is like a truck.... I would say it could be burst knock in the tune. Sounds very familiar with what my truck did the first time I went from 6lbs up to 9. Just zero out the table in the tune. My FP would drop several psi, like 8, during a WOT run. No its not really ideal, and is now fixed, but it doesnt mean its going to go lean. I was OLSD as well.
If the car was fine at 6 psi, and you went to retune for higher boost and the air fuel reads 10.0-1, you need to take some fuel out of it! That is definitely part of, if not all of the problem.
Any car with a stock style fuel system is going to lose some fuel pressure, but keeping it at a minimum is good. Another fuel pump in the tank triggered to come on under boost would help.
at 10.0-1 on the dyno the car should spit some black smoke, were you able to tell anything there?
at 10.0-1 on the dyno the car should spit some black smoke, were you able to tell anything there?
Any car with a stock style fuel system is going to lose some fuel pressure, but keeping it at a minimum is good. Another fuel pump in the tank triggered to come on under boost would help.
at 10.0-1 on the dyno the car should spit some black smoke, were you able to tell anything there?
at 10.0-1 on the dyno the car should spit some black smoke, were you able to tell anything there?