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Old 01-08-2011, 05:05 PM
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Overboost Question

Hi everyone, I just recently installed a banks wastegate actuator and I am seeing some interesting behavior. The first time I floored it, after install, my boost jumped up to 25psi for a few moments and then I felt the truck suddenly loose power and the boost fell back to ~17 psi. From there on it seemed to maintain that level of power for the rest of the climb. I pulled over and noticed some soot around the exhaust housing on my turbo. So I wrote the problem off as causing a new turbo exhaust leak from the increased drive pressure.

This happened in the process of a series of upgrades I was performing over christmas break. I have since installed stage I injectors and an adrenaline injector pump. What is weird is that it can now easily maintain 25psi of boost but it still has that power loss after a few seconds. With the new hpop I am maintaining a constant 3200psi at WOT, so I am not feeling the loss due to injector pressure that I used to.

Granted I still need to fix the new turbo exhaust leak and the up-pipe leak I discovered in this process, but could the ecu be cutting fuel due to the higher boost pressures? The SES light is not coming on. Any other thoughts?

Thanks,
Dustin
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Old 01-08-2011, 10:28 PM
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Do you have a boost relife valve inline with your MAP sensor? This could be your problem.

This is what I am talking about.
http://www.dieselsite.com/index.asp?...PROD&ProdID=31
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Old 01-08-2011, 11:49 PM
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you have to have a boost fooler/boost annihilator on it. once the computer sees over 17 PSI, it defuels.

Order one from ITP/Sinsiter diesel.
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Old 01-09-2011, 03:01 AM
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Great! That is what I was hoping for. The kit on sinister diesel says that it is set at 21 to 22 lbs of boost. Should I adjust it down to 17 psi?

Last edited by crf250guy; 01-09-2011 at 03:23 AM.
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Old 01-09-2011, 09:23 AM
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No, it will be fine at the preset value.
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Old 01-09-2011, 12:58 PM
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Fine or delivering maximum fuel? Thanks!
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Old 01-09-2011, 01:38 PM
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It won't defuel until around 22psi is reached. If you set it lower, your truck will think you have less air and retard the fuel to match.
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