VR VSS signal - Noisy when stopped

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VR VSS signal - Noisy when stopped

Postby goodysgotacuda » Wed Oct 11, 2017 7:04 pm

upload tune.msq
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I am trying to work through an issue that I have while stopped and my output shaft speed sensor.

My signal is excellent when driving down the road, but is extremely noisy while revving [stopped]. I can see up to 40mph when stopped and on the launch rev-limiter and a steady 2mph when idling. Currently I just have a twisted pair of wires, that runs within my entire engine "bundle" passing through the firewall. I am considering trying to fish some shielded cable through that bundle and rewiring it, but that is a last attempt.

Are there any settings here that I could look into to help that? I noticed that my TunerStudio manual image does not line up with my application, [see screenshot], perhaps VSS Sampling may help?

Screen Shot 2017-10-11 at 8.59.23 PM.png
Screen Shot 2017-10-11 at 8.59.23 PM.png (313.74 KiB) Viewed 171 times


upload tune.msq
(266.23 KiB) Downloaded 2 times



My log file is too large to upload and I am not sure how to shorten it.
1972 Plymouth 'Cuda - 5.7L Hemi w/T56 Magnum

MS3 Gold Box

I'm new to Megasquirt!
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Re: VR VSS signal - Noisy when stopped

Postby firebird_1995 » Wed Oct 11, 2017 9:35 pm

Subscribed for same exact issue.....

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Re: VR VSS signal - Noisy when stopped

Postby slow94formula » Mon Oct 16, 2017 12:10 pm

Mine was noisy until I put a 10k ohm resistor across the wires.
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Re: VR VSS signal - Noisy when stopped

Postby LT401Vette » Mon Oct 16, 2017 2:56 pm

Incorrect grounding can cause it, but I have had to use the 10k shunt as well.
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Re: VR VSS signal - Noisy when stopped

Postby goodysgotacuda » Mon Oct 16, 2017 7:32 pm

slow94formula wrote:Mine was noisy until I put a 10k ohm resistor across the wires.



I'll give that a shot, thanks!
1972 Plymouth 'Cuda - 5.7L Hemi w/T56 Magnum

MS3 Gold Box

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