Supercharger not engaging
Thread Starter
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Joined: Aug 2006
Posts: 4,909
Likes: 130
From: Houston
C63S
Supercharger not engaging
Lately, my S/C has not been engaging 100% of the time (1 out of every 15 times it doesn't). This only happens when I start to go after a stop. When it doesn't engage, I can floor the car to redline and there is no power. I can take my foot off of the gas and re-apply throttle and power returns. It has never done it from a roll.
I took some time to log my last trip and it happen to do it, so I have a record of it. See the 1-table.pdf below and take a look at lines 496-510. You will notice there is little or no boost.
I suspect that it is either the S/C clutch, RPM sensor, or IC pump. I replaced my IC pump about 12k ago, but I'm not ready to rule it out.
I also attached the plotted version of the data.
Yes, I was hauling some @$$ during these runs. I wanted to see if I could get an accurate reading of boost. I guess boost and intake manifold pressure are not the same.
I took some time to log my last trip and it happen to do it, so I have a record of it. See the 1-table.pdf below and take a look at lines 496-510. You will notice there is little or no boost.
I suspect that it is either the S/C clutch, RPM sensor, or IC pump. I replaced my IC pump about 12k ago, but I'm not ready to rule it out.
I also attached the plotted version of the data.
Yes, I was hauling some @$$ during these runs. I wanted to see if I could get an accurate reading of boost. I guess boost and intake manifold pressure are not the same.
MBWorld Fanatic!
Joined: Nov 2005
Posts: 1,513
Likes: 0
C32 AMG
Lately, my S/C has not been engaging 100% of the time (1 out of every 15 times it doesn't). This only happens when I start to go after a stop. When it doesn't engage, I can floor the car to redline and there is no power. I can take my foot off of the gas and re-apply throttle and power returns. It has never done it from a roll.
I took some time to log my last trip and it happen to do it, so I have a record of it. See the 1-table.pdf below and take a look at lines 496-510. You will notice there is little or no boost.
I suspect that it is either the S/C clutch, RPM sensor, or IC pump. I replaced my IC pump about 12k ago, but I'm not ready to rule it out.
I also attached the plotted version of the data.
Yes, I was hauling some @$$ during these runs. I wanted to see if I could get an accurate reading of boost. I guess boost and intake manifold pressure are not the same.
I took some time to log my last trip and it happen to do it, so I have a record of it. See the 1-table.pdf below and take a look at lines 496-510. You will notice there is little or no boost.
I suspect that it is either the S/C clutch, RPM sensor, or IC pump. I replaced my IC pump about 12k ago, but I'm not ready to rule it out.
I also attached the plotted version of the data.
Yes, I was hauling some @$$ during these runs. I wanted to see if I could get an accurate reading of boost. I guess boost and intake manifold pressure are not the same.
What kind of hardware are you using to collect and report this information? Looks pretty cool.
Banned
Joined: Mar 2006
Posts: 2,855
Likes: 2
From: Southern California
S600TT, R350
Jerry, Looking at the data it looks like the IC pump is working.
Try logging airflow from MAF function. I know we do not have MAF, but this option still should be on your menu to choose from.
And try doing couple more runs logging RPM vs. MAF vs. Intake Manifold Pressure.
Try logging airflow from MAF function. I know we do not have MAF, but this option still should be on your menu to choose from.
And try doing couple more runs logging RPM vs. MAF vs. Intake Manifold Pressure.
MBWorld Fanatic!
Joined: Jul 2006
Posts: 2,146
Likes: 1
From: L.A., CA
'08 M5, '10 Land Cruiser
Off topic...
Jerry, Looking at the data it looks like the IC pump is working.
Try logging airflow from MAF function. I know we do not have MAF, but this option still should be on your menu to choose from.
And try doing couple more runs logging RPM vs. MAF vs. Intake Manifold Pressure.
Try logging airflow from MAF function. I know we do not have MAF, but this option still should be on your menu to choose from.
And try doing couple more runs logging RPM vs. MAF vs. Intake Manifold Pressure.
Banned
Joined: Mar 2006
Posts: 2,855
Likes: 2
From: Southern California
S600TT, R350
Carl:
I have joined GMGRacing (www.gmgracing.com) as sales/service manager.
I will posting more information about my move very shortly.
You can still stop by, address is on the website.
Thanks,
I have joined GMGRacing (www.gmgracing.com) as sales/service manager.
I will posting more information about my move very shortly.
You can still stop by, address is on the website.
Thanks,
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,289
Likes: 3
From: OC
C32
Maybe try replacing the SC clutch engage relay. Since the ECU does not monitor the engagement of the SC it would not set a CEL if it fails to engage. I'm not sure where it is located, but with the current draw of the clutch it could fry the contacts over time.
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Banned
Joined: Mar 2006
Posts: 2,855
Likes: 2
From: Southern California
S600TT, R350
Maybe try replacing the SC clutch engage relay. Since the ECU does not monitor the engagement of the SC it would not set a CEL if it fails to engage. I'm not sure where it is located, but with the current draw of the clutch it could fry the contacts over time.
Yesterday 05:30 PM
Yesterday 05:30 PM
My car does it once in awhile. I have not had a chance to look into it yet.
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MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,289
Likes: 3
From: OC
C32
DME engages S/C clutch, so there us no relay. And it does monitor the engagement as boost signal. So if there is no code set, than it can only mean that DME did not want to turn on the clutch due to some other condition present.
My car does it once in awhile. I have not had a chance to look into it yet.
My car does it once in awhile. I have not had a chance to look into it yet.
Thread Starter
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Joined: Aug 2006
Posts: 4,909
Likes: 130
From: Houston
C63S
