After alot of fiddling with the VR pots, I finally got MS to read a signal. After another hour of tuning, I'm very frustrated with this. When cranking, it jumps from 0 to about 2k rpm, and then quickly drops down back to 0, and repeats this. Sometimes I can get it to read a solid 60rpm, however it is VERY incosistent, and sometimes jumps back to the old 2k-0 dance, or it just won't read a signal at all. MSQ and log included. Do I have to modify my VR circuit?
I read on some other forums that maybe a diode should be changed or a cap be removed... Might this help? I'd rather not do any more soldering but it looks like I may have no choice. I've tried adjusting the voltage trigger pot as far CCW while still getting a signal, and then adjusting hysterisis from there, is this the proper method? Also would I have this issue if my VR sensor wires were reversed? I don't think thats the case but it's possible.
I'm an MS newbie, car is a '01 Hyundai Tiburon, 60-2 wheel. From the hyundai service website, Basic ignition timing BTDC 10° ± 5°. I contacted an MS-I extra user who had an MS in his tib, he said he had trigger position A= 10, trigger position return = 18. Not sure if this is relavent to my scenario...
Anyways, if theres any other info I can provide let me know. Any help is appreciated.
Mat
Erratic VR Signal, Difficult to tune
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Re: Erratic VR Signal, Difficult to tune
Oops, here are the files. If it helps, I'm running MS-II extra 2.0.1.
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Matt Cramer
- Super Squirter
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Re: Erratic VR Signal, Difficult to tune
A lot of 60-2 wheels work better with a 10K resistor on the VR sensor signal wire. Let me know if this helps.
Re: Erratic VR Signal, Difficult to tune
I don't know what board you have but I accidentally put my 2 VR pots in backwards but I was able to just crank them opposite of what the manual suggested.
But then I found the signal to be erratic still until someone (probably Matt) told me to wire the VR wires backwards and use the inverse jumper on the board as that is the SOP. I did that and signal worked awesome. I have a 36-1 tooth wheel but these are my settings. Make sure your settings are right or it won't work. My VR sensor is 9 teeth before TDC.
But then I found the signal to be erratic still until someone (probably Matt) told me to wire the VR wires backwards and use the inverse jumper on the board as that is the SOP. I did that and signal worked awesome. I have a 36-1 tooth wheel but these are my settings. Make sure your settings are right or it won't work. My VR sensor is 9 teeth before TDC.
1990 VW Corrado w/ 2.0 16v - MS2extra, V3.0 board, 2.886 code
Re: Erratic VR Signal, Difficult to tune
It sure fixed me up! 2 different wheels and 2 different sensors both with erratic or non-existant signals. Soldered the resistor inline and instant cure to my woesMatt Cramer wrote:A lot of 60-2 wheels work better with a 10K resistor on the VR sensor signal wire. Let me know if this helps.
