Rpm Signal Noise
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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).
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.
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Scotty Dont
- MegaSquirt Newbie
- Posts: 5
- Joined: Wed Oct 01, 2008 7:49 am
Rpm Signal Noise
There seems to be some noise in my ignition signal. I have tried to search and I can't find the answer, I am running a shielded wire on my fuel only ms2 v3.0 and I want to know if both sides of the shielding need to be grounded. And What is the proper way to route and set up the shielded rpm signal wire.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Rpm Signal Noise
Normally you'd only ground one side of the shield to avoid ground loops. Exactly what sort of ignition system are you running?
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Scotty Dont
- MegaSquirt Newbie
- Posts: 5
- Joined: Wed Oct 01, 2008 7:49 am
Re: Rpm Signal Noise
Its a vr sensor in the dist and im getting signal from the neg side of the coil. This is a Starion G54b in a mitsubishi mighty max with a sheet metal mpi intake and a holset hx35.
Should I route the rpm signal wire with the main harness or should I keep it separate and away from other wires?
Should I route the rpm signal wire with the main harness or should I keep it separate and away from other wires?
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Matt Cramer
- Super Squirter
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- Joined: Sat Jul 03, 2004 11:35 am
Re: Rpm Signal Noise
The negative side of the coil is a noisy place to trigger from. How are D1, D2, and the input capacitors set up?
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Scotty Dont
- MegaSquirt Newbie
- Posts: 5
- Joined: Wed Oct 01, 2008 7:49 am
Re: Rpm Signal Noise
Where should I trigger from then? And the ecu was purchased from you (diy) it came loaded with 2.888 all I did was change the board to what I said in the megamanual "For triggering off the coil negative terminal/points"
D1 has the wing diode
D2 has the 22v zener diode in reverse
and I am unsure about the input capacitors but like I said the ecu was built by diy
D1 has the wing diode
D2 has the 22v zener diode in reverse
and I am unsure about the input capacitors but like I said the ecu was built by diy
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Rpm Signal Noise
You could trigger it off the VR sensor instead, might get a cleaner signal. Or try cutting the XG1-XG2 jumper and running a wire from XG1 to an external ground.