Since I installed a set of vortec heads (ported and polished) and new cam (comp cams 422) My turbo has started overboosting to 25 pounds of boost. What could be the cause of this. Truck runs fine except for that. It has the stock turbo for now I will be replacing this in the future.
overboosting
- Thread starter syclone74
- Start date
Re: overboosting
I have the stock ecm right now with kenne bell chip I know this chip is junk plan on getting another but boost was fine until I changed the heads and cam. What is the best way to control boost? Manual control valve any good? What could be causing this overboost?
I have the stock ecm right now with kenne bell chip I know this chip is junk plan on getting another but boost was fine until I changed the heads and cam. What is the best way to control boost? Manual control valve any good? What could be causing this overboost?
JSM
Active member
Re: overboosting
I just find this funny.
"I know this chip is junk plan on getting another but boost was fine until I changed the heads and cam. "
Read this, think about it.
Lets see you have the worse chip made, you just changed how the air goes in and out of the motor and you wonder why boost is no longer the same? Not trying to pick on ya, just trying to give you some common sense.
I personally HATE manual boost valves. Why risk a motor over a $15 part?
The stock logic can be good, if you understand how it works and your willing to do some custom tuning with the chip. (which I think everybody should do anyways). Now that you made such big changes your fuel will be wrong, spark, and as you have seen boost. The computer needs to know these things to make them work.
The computer is a simply if this, then do this machine. It can't do much if any thinking on its own. So when you make changes, but don't change the "do this" part odd things will happen, trucks will blow up, run slower and have bad boost control.
I just find this funny.
"I know this chip is junk plan on getting another but boost was fine until I changed the heads and cam. "
Read this, think about it.
Lets see you have the worse chip made, you just changed how the air goes in and out of the motor and you wonder why boost is no longer the same? Not trying to pick on ya, just trying to give you some common sense.
I personally HATE manual boost valves. Why risk a motor over a $15 part?
The stock logic can be good, if you understand how it works and your willing to do some custom tuning with the chip. (which I think everybody should do anyways). Now that you made such big changes your fuel will be wrong, spark, and as you have seen boost. The computer needs to know these things to make them work.
The computer is a simply if this, then do this machine. It can't do much if any thinking on its own. So when you make changes, but don't change the "do this" part odd things will happen, trucks will blow up, run slower and have bad boost control.
It's just a six
Super Member
Re: overboosting
I ran a KB chip & it was not that bad.
The chip(KB) I had pulled timeing out if it was knocking & it was not much slower than my Pitbull chip I had run also.
You had made a lot of changes, or just installed ported vortec heads & a cam ?
I might think your wastegate might be sticky,binding , leaking vacuum lines that control the wastegate system.
Possibly bad/leaking wastegate actuator?
Just a few things to look @ before you throw away a decent chip.
I am sure there are other ideas people can come up with to help you out.
I ran a KB chip & it was not that bad.
The chip(KB) I had pulled timeing out if it was knocking & it was not much slower than my Pitbull chip I had run also.
You had made a lot of changes, or just installed ported vortec heads & a cam ?
I might think your wastegate might be sticky,binding , leaking vacuum lines that control the wastegate system.
Possibly bad/leaking wastegate actuator?
Just a few things to look @ before you throw away a decent chip.
I am sure there are other ideas people can come up with to help you out.
QUICK STORM
B.A.M.F. BMW Tech
Re: overboosting
get rid of the KaBoom chip
get rid of the KaBoom chip
It's just a six
Super Member
Re: overboosting
Most of the reason why a particular chip will blow up a engine is because they (the owners) do not run the required octane fuel.
I seen people run a strip chip w/91 octane.
Most of the reason why a particular chip will blow up a engine is because they (the owners) do not run the required octane fuel.
I seen people run a strip chip w/91 octane.
It's just a six
Super Member
Re: overboosting
You can hook up a vacuum gage to the wastgate actuator & note the vacuum reading & see if it drops off from where you last checked it/left it.
You can hook up a hose to the wastegate actuator w/10 or so psi behind it & see if you actator moves freely & smoothely ,not ratchety, not smooth moving.
You can take the actuator off, submerge it in a bucket of water, apply 10 psi to the port & see if it constantly leaks air by seeing bubbles in the water.
It seems the hoses/vacuum lines get old & leaks,cracks, do you have the OG hoses/vacuum lines?
There are other ways also for testing.
syclone74 said:
You can hook up a vacuum gage to the wastgate actuator & note the vacuum reading & see if it drops off from where you last checked it/left it.
You can hook up a hose to the wastegate actuator w/10 or so psi behind it & see if you actator moves freely & smoothely ,not ratchety, not smooth moving.
You can take the actuator off, submerge it in a bucket of water, apply 10 psi to the port & see if it constantly leaks air by seeing bubbles in the water.
It seems the hoses/vacuum lines get old & leaks,cracks, do you have the OG hoses/vacuum lines?
There are other ways also for testing.
UR50SLO
V6+2=LSXCamaro
Re: overboosting
Great trouble shooting guys.. Like above stated.. check the vaccume hose routing and hoses. With out that hooked up correctly or leaking it'll overboost for sure.
Jwaller brought up a good point on the wastegate hole that get's overlooked alot. This happens in our Buicks alot.
I run www.RJCRacing.com boost controller. It's simple and cheap. It keeps the wastegate actuator from moving (shut) till you hit the boost it's set at and then opens it and keeps very steady boost. There is only one moving part in it and have no boost creep.
Spools much faster than stock (if that's possible with that small of a turbo) lol.. Works good on our Buick stuff.
Good luck, Scott~
Great trouble shooting guys.. Like above stated.. check the vaccume hose routing and hoses. With out that hooked up correctly or leaking it'll overboost for sure.
Jwaller brought up a good point on the wastegate hole that get's overlooked alot. This happens in our Buicks alot.
I run www.RJCRacing.com boost controller. It's simple and cheap. It keeps the wastegate actuator from moving (shut) till you hit the boost it's set at and then opens it and keeps very steady boost. There is only one moving part in it and have no boost creep.
Spools much faster than stock (if that's possible with that small of a turbo) lol.. Works good on our Buick stuff.
Good luck, Scott~