Hitting boost cut off.
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Joined: Nov 2002
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From: Toronto
Having a hard time understanding your post.
What is your target boost? 14.5psi?
Are you creeping to 17.1psi and hitting boost cut?
How do you know it's boost cut? Is the Profec hitting it's set warning and defaulting to wastegate boost? Or are you hitting a fuel/ignition cut that has been set in the AEM?
What is your AEM boost cut set at?
Darryl
What is your target boost? 14.5psi?
Are you creeping to 17.1psi and hitting boost cut?
How do you know it's boost cut? Is the Profec hitting it's set warning and defaulting to wastegate boost? Or are you hitting a fuel/ignition cut that has been set in the AEM?
What is your AEM boost cut set at?
Darryl
Thread Starter
Joined: Aug 2004
Posts: 4,131
Likes: 1
From: New Jersey
Hey whats up guys, Darryl its boost cut out cause i called Jeff(tuner) and he said he set it for 17.1 and on my boost controller thats the boost am hitting.
So my high boost setting is for 14.5
And my boost cut out is set for 17.1
No its not hitting the warning setting, i think i have it set higher ( need to turn it down i know)
My AEM boost cut is set for 17.1
Marcus
So my high boost setting is for 14.5
And my boost cut out is set for 17.1
No its not hitting the warning setting, i think i have it set higher ( need to turn it down i know)
My AEM boost cut is set for 17.1
Marcus
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Joined: Aug 2004
Posts: 4,131
Likes: 1
From: New Jersey
Originally Posted by icemans2k02,Nov 2 2006, 10:59 PM
are you bouncing off rev limiter?.. almost sounds like vtec wont let you engage
I hit redline with no problem.
Marcus
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Joined: Nov 2002
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From: Toronto
What is your low boost set to?
I'm thinking that you may have low boost on the Profec set to 0%, which is wastegate spring pressure. So in essence, the Profec is not controlling boost at all. When you switch to high boost, it's actually adding pressure to the top of the wastegate and not allowing it to open. I'm thinking that because you mentioned you brough the high boost duty almost down to zero % and it's not making a difference. This tells me that your boost solenoid may be toast.
If that's not the case, it may be that your high boost's "Start" setting is far too aggressive. That feature keeps the wastegate closed until it hits your start boost setting. If it's too aggressive, it will overshoot each time making you hit your boost cut. Look at that parameter and try lowering it considerably to see if it solves the problem.
Darryl
I'm thinking that you may have low boost on the Profec set to 0%, which is wastegate spring pressure. So in essence, the Profec is not controlling boost at all. When you switch to high boost, it's actually adding pressure to the top of the wastegate and not allowing it to open. I'm thinking that because you mentioned you brough the high boost duty almost down to zero % and it's not making a difference. This tells me that your boost solenoid may be toast.
If that's not the case, it may be that your high boost's "Start" setting is far too aggressive. That feature keeps the wastegate closed until it hits your start boost setting. If it's too aggressive, it will overshoot each time making you hit your boost cut. Look at that parameter and try lowering it considerably to see if it solves the problem.
Darryl
Joined: Jun 2004
Posts: 11,244
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From: Raleigh, NC
Markus, maybe you should try lowering your "start" setting. I needed to turn down my profec over the past few days due to the colder temps I was spiking to almost 8psi and i'm running a "0" for the "set" value. I lowered my "start" setting and it lowered the boost target even though it was only running off the wastegate spring.
Glad you figured it out. 
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