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jsveb's Avatar
 
Join Date: May 2007
Location: Norseman territory
Posts: 2,796
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CIS Data log - help me analyze

Well, first I need help to actually load the "sessions" from the logworks onto this thread.
How do I do that?

the car is running like crap when ever I accelerate and boost it. I can ruise 45-60mph just fine, sort of.

I have got a couple of logged sessions with the following data:control pressure, MAP, RPM, AFR and Gs

Control pressure seems to be faily stable. This leads me to rule out a CIS malfunc...?

Then I basiccaly have got a vacuum leak and ignition left as possible culprits. Since the car builds boost, I tend to lean towards ignition.

Help me figure this out, since this is really starting to bother me.

Thanks guys

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Jesper
Carrera 3.0 1975
930 1978 OEM Matte Schwartz, ANDIAL IC, BL WUR, SC cams. LMA-3 w. XD-16 and CP transducer
www.stauningwhisky.dk
Old 04-16-2013, 11:02 AM
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beancounter
 
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Join Date: Jan 2008
Location: Weehawken, NJ
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A good way to get the graphs from logworks onto a thread here is to take a screen shot. You can do this with the shift + print screen key stroke. Paste the screen image into the Paint application and you can edit as needed, and save as a jpeg file for posting on the thread.

You say control pressure is stable? The control pressure should drop when you are on boost, otherwise your afr will go lean. Maybe you're not getting into boost enough? I tried to start a datalogging thread where people could post up their graphs and we could build an online knowledge base...nobody jumped in.

Ultimate Datalog Thread - post your logs here
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Jacob
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Old 04-16-2013, 11:23 AM
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I was hoping something like YouTube and see the entire thing as it happened.

When I say CP was stable, I don't mean frozen, the afr drops as boost builds. Actually too much going into low tens in initial boost.

I will be more than happy to contribute to that thread, once I believe I have something that is useful to others. Right now I am REALLY frustrated because this thing still drives like crap inspite of a rebuild, replace and adjusted everything several times.
I believe I have never felt what a well tuned 930 dries like. I have has this car for more than two and a half year.
Yes, it is bugging me.

Old 04-16-2013, 12:48 PM
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