VEMS Startup
#1
Rennlist Member
Thread Starter
VEMS Startup
Just reaching out to anyone who might have gone down this road I'm currently on with initial startup issues after installing VEMS ECU. I have been working closely with Peeps and he has tried his best to help me diagnose a no spark no fuel condition during cranking. My car is an 86' 951 with a new 3.1l which was running with M-Tune, but had a few issues with WOT hesitation and a sharp idle drop an deceleration so I decided to go another direction. With all the options stand alone offered I decided to go with VEMS to have more versatility when it came to tuning. This is my first exposure to tuning/operating a stand alone ecu and Peeps has showed a lot of patience with me. So where we're at today is, Verified 500-1000 ohms from speed and reference sensors at the sensor and at the VEMS ecu connector. Verified the wasted spark setup thru a test mode within VEMS to each spark plug and its correct location. Fuel pump is priming when key is on. Made a trigger log and sent it off to Peeps for evaluation, but have not heard back yet on the results. I've been talking with another RL on here about my situation and he had asked if I was running a light weight FW. I have a Spec 3 push clutch with the steel FW that has the 3 scallops to reduce the rotating mass. I know from reading other threads on here that it has caused some screwy things to happen with the speed and reference sensors with a no spark and no fuel issues or just not running correctly. If anyone has had experience with this please pipe in, it will be greatly appreciated. Other items I've replaced last year are, injector wiring harness, DME relay and during the install of VEMS replaced all the pos & neg battery cables and terminals throughout.
Last edited by David Ewell; 02-24-2018 at 09:12 PM. Reason: adding information
#2
Burning Brakes
Not sure where you are at in trouble shooting, but here is a video showing a static & dynamic test of the flywheel sensors.
I realize that your wiring is going to be different now, but if you've got VEMS installed then you should have some knowledge of the ignition system.
I realize that your wiring is going to be different now, but if you've got VEMS installed then you should have some knowledge of the ignition system.
#4
Rennlist Member
Oh man sorry to hear of your trouble David
My vems is currently in route should probably have it in the next week or so.
I have virtually the same setup as you. I was running M tune with basically the same run issues that you outlined. I also decided better to go vems.
My car is alusil 3L. I have a fully lightened stock steel flywheel with the BMW speed and reference sensors.
I assume you've tried the simple stuff like swapping the plugs on the speed and reference sensor?
My vems is currently in route should probably have it in the next week or so.
I have virtually the same setup as you. I was running M tune with basically the same run issues that you outlined. I also decided better to go vems.
My car is alusil 3L. I have a fully lightened stock steel flywheel with the BMW speed and reference sensors.
I assume you've tried the simple stuff like swapping the plugs on the speed and reference sensor?
#7
If the car has not run with the spec clutch, it could be the height of the reference pin. Lindsey has a "technical bulletin" about increasing the height of the reference pin and spacing the reference sensor up using a stock speed sensor spacer.
I have had issues with my spec push clutch related to kick back on start up that I have not been able to solve. I have been wondering if vems would solve this. I'll be watching your progress.
I have had issues with my spec push clutch related to kick back on start up that I have not been able to solve. I have been wondering if vems would solve this. I'll be watching your progress.
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#8
Burning Brakes
#9
Three Wheelin'
If the car has not run with the spec clutch, it could be the height of the reference pin. Lindsey has a "technical bulletin" about increasing the height of the reference pin and spacing the reference sensor up using a stock speed sensor spacer.
I have had issues with my spec push clutch related to kick back on start up that I have not been able to solve. I have been wondering if vems would solve this. I'll be watching your progress.
I have had issues with my spec push clutch related to kick back on start up that I have not been able to solve. I have been wondering if vems would solve this. I'll be watching your progress.
#13
Rennlist Member
Thread Starter
#15
Rennlist Member
Thread Starter
If the car has not run with the spec clutch, it could be the height of the reference pin. Lindsey has a "technical bulletin" about increasing the height of the reference pin and spacing the reference sensor up using a stock speed sensor spacer.
I have had issues with my spec push clutch related to kick back on start up that I have not been able to solve. I have been wondering if vems would solve this. I'll be watching your progress.
I have had issues with my spec push clutch related to kick back on start up that I have not been able to solve. I have been wondering if vems would solve this. I'll be watching your progress.
Peep has messaged me back and has evaluated my trigger log and said it was identical to one he saw previously with a no spark no fuel issue and this case had a spec push clutch with scalloped fw. Peep did not have a solution at the time so the individual installed a separate trigger wheel which fixed his issue. Peep will be looking into it to see if he can find a solution around using a scalloped fw with VEMS.