I'm trying to use the Tach signal wire on my 97 GSXR to control a fuel only MS. The weird thing is the ignitor box shows 12v on the tach wire at 0rpm and seems to bring it low to pulse the tach. The thing is, it never seems to drop all the way to 0v and the MS won't pick it up. While cranking the voltmeter shows about 2.5 to 4 volts. Is there any way to get this to work?
Triggering from the coils is a no go, the primary side of the coils run at 200v. Unless theres something I havent heard of that allows this to work.
MS1 3.0 stock code
Any way to use a tach signal like this?
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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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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Any way to use a tach signal like this?
Weird signal, but I've seen them before. You could build an op amp comparator circuit that sends out 12 volts whenever the signal drops below 6 volts or so. Or take a 5 volt zener diode and put it inline with the tach signal, banded end away from the MS.
Re: Any way to use a tach signal like this?
The zener diode trick sounds promising. Ill give it a try tonight or tomorrow.
Thanks
Thanks