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Mega/Microsquirt and 60-2 flywheel - what value shunt resistor?
I'm using a Microsquirt v3 with a Porsche 993 VR crank pickup and my flywheel cut to 60-2.
I got a great start and picture perfect composite logs at low RPMs but ran into signal breakup and the "fake rev limiter" behavior at around 2,600 rpm. I added a 10k ohm shunt across the pins in-harness for the crank pickup and that raised my "rev limit" to about 4,600 rpm, but its still there. If you've gone down this patch, what value shunt resistor did you end up with to eliminate this problem?
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan '14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button! |
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05-12-2019, 04:18 PM
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Now in Florida !
Join Date: Aug 2012
Location: York Beach, Maine and Anastasia Island, Florida
Posts: 406
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Could the issue be the gap? I've read that it should be 1mm, but I'm not an expert.
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1983 911SC Coupe Hot Rod - Platinum - Twin plugged 3.4, DC-60 cams, PMO 50's, 1 3/4 headers, Bill Rader 915 w/LSD 1976 914 2.0 Lime Green Metallic - Completely stock |
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05-12-2019, 04:50 PM
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Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,710
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20k
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
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05-12-2019, 08:35 PM
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Gap is in spec. I'll try 20k.
Although going to a higher value doesn't fit the logic I was using. If the issue is as claimed, that the VR sensor is producing too much voltage at high RPMs, and the resistor across the pins allows some of that voltage to leak to ground, I would have expected a lower value resistor to be the solution. Regardless, I'll try 20k
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan '14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button! |
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05-13-2019, 04:44 AM
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