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It is currently Wed Dec 23, 2009 12:22 pm
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Welcome to <strong>Electromotive TEC Group!</strong>
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[ 4 posts ] |
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dswalterwi
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Post subject: Accelerating slowly causes jerking Posted: Thu Sep 24, 2009 8:36 am |
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| Newly Aquired |
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Joined: Sun Apr 05, 2009 3:08 pm Posts: 34 Location: Wisconsin
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For the most part my car is runing great. It pulls strong and I am happy with the power. There are a couple kinks that I am trying to work out to make it a more drivable car. If I really stand on the throttle it runs great and pulls strong. When I try to just mildy to moderately accellerate it will sometimes start jerking radically enough that I have to push in the clutch and rev it a few times to get it to settle down then continue. I'm not sure what to adjust to control this behavior. Possibly related to this is run I try to just cruise or sometimes during very slow deceleration it will start jerking as well.
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Jon@EMI
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Post subject: Re: Accelerating slowly causes jerking Posted: Thu Sep 24, 2009 8:46 am |
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| EMI |
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Joined: Tue Feb 26, 2008 10:19 am Posts: 371 Location: Manassas, VA
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Sounds like you have a farily large step in your ignition timing table. Take a look at where you would be when the jerking would start (probably 50-70kpa and the RPM where the jerking starts) and you will probably find a jump from 18ish to 35ish. See if you can smooth that out (may be tricky in an 8x8 map without compromise) and that should solve the jerking problem.
_________________ Jon
Project Engineer
Electromotive, Inc
jon at emi.cc
www.distributorless.com
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dswalterwi
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Post subject: Re: Accelerating slowly causes jerking Posted: Thu Sep 24, 2009 8:51 am |
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| Newly Aquired |
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Joined: Sun Apr 05, 2009 3:08 pm Posts: 34 Location: Wisconsin
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Jon, Thanks for the quick response. Is ther a way that I can send you my BIN file to look at? My email is dswalterwi@gmail.com if you want to do it that way.
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dswalterwi
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Post subject: Re: Accelerating slowly causes jerking Posted: Fri Sep 25, 2009 11:34 am |
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| Newly Aquired |
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Joined: Sun Apr 05, 2009 3:08 pm Posts: 34 Location: Wisconsin
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I did a test drive before making changes to see where the map and rpm's were suspect at cruising and found it to be around 34 to 36 MAP and about 2200 - 2500 RPM. My ignition timing was: 40 - 15 22 25 40 40 40 42 44 30 - 16 20 35 40 40 40 42 44 950 1500 2500 3500 4500 5500 6500 7500
I changed the 35 at 2500 rpm to 30 and that helped smooth it out alot. I also bumped the AFR up a slight bit in the VE tables of the same area.
Thanks for your help,
Running smooth, Don.
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