Buildning µS on a KTM 1cyl 609cc engine.
to start with I tryed to use the original VR sensor but got alot of big rpm spikes, then installed a 50k resistor and got rpm and the engine started but idles very bad. Checked the log and could se that the pw sometimes gose down to zero for no reason:S
an that seams to get wors when the engine gets hot.
I think it may have something to do with my past problems with rpm spikes, so i got a 7pin HEI to give the µS a clean square puls.
My problem now is that i dont get any rpm to the µS, but if i check the signal on optoin with the scope can i se a nice square with aprox 2v amplitude. Is the pulse too weak or why dont I get a rpm signal?
The tooth on the flyweel is a big tooth that stretches from 65 to tdc i think, should that cause any problem?
rpm problem with 7pin HEI
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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
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Matt Cramer
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Re: rpm problem with 7pin HEI
Try wiring the OPTOIN- wire to the HEI module's output, and the OPTION+ wire to VREF. You'll need to swap the Ignition Input Capture setting to make this work but it often gives a stronger signal.
Re: rpm problem with 7pin HEI
Thanks, it wrokedMatt Cramer wrote:Try wiring the OPTOIN- wire to the HEI module's output, and the OPTION+ wire to VREF. You'll need to swap the Ignition Input Capture setting to make this work but it often gives a stronger signal.
You mean that the signal gets inverted and if trigged on going high befor i should change it to going low to trigg on the same point?
If i trigg on going high (going low after mod?) would that be the edge on the trigger tooth insted of the middle of the tooth if i go with going low? because i have a very big tooth would it be better to get the trigger on the edge of the tooth.
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Matt Cramer
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- Joined: Sat Jul 03, 2004 11:35 am
Re: rpm problem with 7pin HEI
This triggers on the same edge of the tooth but it inverts the square wave signal that the HEI module puts out.
Re: rpm problem with 7pin HEI
I was right:)micke265 wrote: Checked the log and could se that the pw sometimes gose down to zero for no reason:S
an that seams to get wors when the engine gets hot.
I think it may have something to do with my past problems with rpm spikes
Started the bike yesterday and it idled more stable and all zero pw disapeard.