Boost off and on
07-20-2013, 02:06 AM
#1
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Boost off and on
Whenever is start my car I can do a run up until about 100 mph, then my blow off valve will blow and my car won't hold above 5psi. After I restart the car the same happens, around 100 mph and 25 pounds if boost. What could this be??? It runs fine up until that point
07-20-2013, 03:07 PM
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I just bought the car three weeks ago, I know it's tuned I'm just not sure if it's done correctly, and I do have a manual boost controller. Could that be the issue?
07-20-2013, 03:48 PM
#8
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okay im sorry if I sound stupid but I legit know next to nothing about these cars.. could it be possible I have like a 22psi tune and my boost is set on like 25psi so it senses pressure that's too high and puts it in limp mode?
07-20-2013, 05:56 PM
#12
An overboost situation would cause the car to do this. If for instance the car sees that it's starting to make too much boost then it'll go into a self-protection mode and limit boost to around 5psi. Turning the car off and back on will reset the limp mode, though the problem is either a hardware problem, such as boost creep (like the wastegate, wastegate actuator, or wastegate solenoid / boost controller not working right), or an issue with the tune and the overboost parameters are needing to be loosened up a bit.
The reason it's doing this during a prolonged run is that the computer watches and attempts to control it for certain amount of time, but if the boost goes out of bounds past that amount of time, then it'll go ahead and throw in the towel and just go limp to be safe.
The reason it's doing this during a prolonged run is that the computer watches and attempts to control it for certain amount of time, but if the boost goes out of bounds past that amount of time, then it'll go ahead and throw in the towel and just go limp to be safe.
07-21-2013, 11:37 AM
#14
is it a bov or bpv? if its bpv then its ur vacuum tank that's bad, if ur bov is connected to bpv solenoid and is still using vacuum tank then its the same issue. mine was bad and when id hit 15 psi my bpv would start opening and closing not letting me boost past 15 psi. and it would drop to 10 sometimes. I removed the vacumm tank and problem solved
07-22-2013, 08:07 PM
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my car would do this when i had a cheap bov on it and id hit peak boost for more than a few minutes. it turned out that it started slipping open and bleeding boost till it just dumped and it would put me in limp mode.
07-25-2013, 04:37 PM
#19
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Remove the bov and use the stock bpv. Find someone who has an hptuners cable or buy one see what tune is on there, you can also email Vince from Trifecta with your VIN and he can tell you if its been tuned by Trifecta
07-26-2013, 05:25 PM
#21
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Then start putting it back to stock, remove the bov and put the stock bpv. There is a good chance the previous owner installed the bov without a tune. Look at the intake side of the turbo and see if there is a plate covering where the bpv should be. If you need I could snap a pic later of what I'm talking about. If you have the bpv remove the bov and reconnect the bpv. If you have a plate there, get a bpv (forge makes a good one) and remove the bov
07-27-2013, 05:06 PM
#23
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If you're going to go back to using the stock BPV, your vac solenoid should be set up as shown below:
You can see in the next photo, your BPV. It has a tan plastic cap on it. The vac line going to it is from the solenoid in the above picture. I realize that the motor pictured is not an LNF, but it is close. The previous poster was saying there will be a plate where the tan plastic BPV "lid" is.
You can see in the next photo, your BPV. It has a tan plastic cap on it. The vac line going to it is from the solenoid in the above picture. I realize that the motor pictured is not an LNF, but it is close. The previous poster was saying there will be a plate where the tan plastic BPV "lid" is.
07-29-2013, 08:26 AM
#25
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Sorry, I forgot to tell you to ignore the "THIS LINE" statement on the motor pic. That was for some other discussion.
With that being said, I don't understand what you are saying about your own setup. Can you take photos?
With that being said, I don't understand what you are saying about your own setup. Can you take photos?