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      06-09-2019, 01:08 AM   #1
Jdbwizzard
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Low power and trap speed from MHD Stage 2+

I am running MHD stage 2+ With DP,IC,and CP w/ stock DV. At a drag strip I was only trapping 103MPH or less. I am thinking this is low.
I know my peak boost is around 17.7 but not sure if this is normal, but from the log the boost is about 1psi less than target.
MHD log in virtual dyno saying around 330 HP not sure how accurate this is.
Any idea on the cause?
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      06-10-2019, 08:15 AM   #2
Jdbwizzard
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So after hours of research and reading some logs I believe it is a boost issue. I'm not sure if it is a boost leak or possible solenoid. I Have two maps logged below. First is MHD 2+ and second is RFP Stage 2. In the second log even though the target boost is 18.2 across the board it is tapering off.

MHD 2+:
https://datazap.me/u/jdbwizzard/mhd-...og=0&data=3-21

RFP 2:
https://datazap.me/u/jdbwizzard/rfp-...=0&data=3-5-22

Not sure where to go from here. I was going to rig up a boost leak test tonight and see. But any further knowledge or help would be appreciated.
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      06-11-2019, 07:45 AM   #3
Jdbwizzard
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Fixed the problem and wanted to report back.
So after a boost leak test I found I had a big leak around my charge pipe meeting the throttle body. It wouldn't even build pressure. Well after some searching I found that I didn't know there was an o-ring in the cp to swap over to the new one.
So for the last six months I've been driving like this. I did notice that there was a noise under full throttle that sounded like a higher pitched tire squeal. I put the o-ring in and the noise is gone and holly crap this thing is fast lol.
The only thing I found odd was how much the target tapers off. It hold at 18.2 but is below 14psi by 6K rpm. But at least now I am right on target boost.
Here is a log:
https://datazap.me/u/jdbwizzard/mhd-...=0&data=3-5-22

Big thanks to everyone before me for all the great information on this site to help me piece together a solution.
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      06-12-2019, 06:17 PM   #4
dtla1
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Possibly two missing O-Rings in two days! https://www.1addicts.com/forums/show....php?t=1619997

Good to hear you're back closer to target.
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