Gavin Posted November 4, 2006 Share Posted November 4, 2006 Just upgraded to MSII on my 99% stock 280z wired up with a 2.2 board, fuel only, using the - side of the coil for triggering. Moved the tables over and everything AFR related works great, but at 4k RPM my tach signal flips out. It doesnt just oscilate back and forth, it seems to completely loose the signal. I'm not using any resistors in the line. What could be causing this and what could I try to fix it? Quote Link to comment Share on other sites More sharing options...
z-ya Posted November 4, 2006 Share Posted November 4, 2006 Are you using the tach output from the MS, or the stock connection? Quote Link to comment Share on other sites More sharing options...
Gavin Posted November 4, 2006 Author Share Posted November 4, 2006 Oh no its not my tachometer in the dash thats giving me trouble, its the tach signal to MS. I can see this happening on the gauge in MegaTune and the engine pretty much stops firing after 4000. But yes all ignition system wiring is stock except for the MS being tapped into the -. So should I maybe try adding resistors to the tach wire? I'm no electrical engineer so I need some help here, no idea what to do. Quote Link to comment Share on other sites More sharing options...
z-ya Posted November 5, 2006 Share Posted November 5, 2006 So it is the same v2.2 board that you we using before, right? And you are just trying to get MSII working in a fuel-only mode for starters, correct? The MSII may be more sensitive to noise on the tach input signal for some reason. I need to take a look at the schematic. PM me, I'm in NH. Quote Link to comment Share on other sites More sharing options...
Gavin Posted November 5, 2006 Author Share Posted November 5, 2006 Yes same exact board and still trying to run fuel only (extremely temporarily I hope). Trying to get this sorted out before I put the ZXt dizzy on. PM'ing now..... Quote Link to comment Share on other sites More sharing options...
Gavin Posted November 5, 2006 Author Share Posted November 5, 2006 Got it working! I needed to use a 'dave' capacitor as z-ya suggested. Thanks! Quote Link to comment Share on other sites More sharing options...
z-ya Posted November 5, 2006 Share Posted November 5, 2006 Gavin, I'm surprised that it ran at without the Dave cap. My fuel only installations where you are triggering off the minus terminal of the coil always required the Dave cap. We should hook up sometime. My cars are in for the winter, but you can still come by sometime. We typically have "work on the club car" days in the winter at my house. You are always welcome (no, you don't have to work, unless you want to). When I get the dyno again for a day, we should get your car on it. Probably won't do another dyno day until spring. Quote Link to comment Share on other sites More sharing options...
Gavin Posted November 5, 2006 Author Share Posted November 5, 2006 Ya its starange, I was familiar with the dave cap, but somehow it didnt give me any trouble with the MSI. My Dad works on exit 1, so its not really out of the way. I'll keep my eye on the club board. I'd love to work on the club car. Also, that dyno, its a DynaPack isnt it? I actualy have a bunch of experience tuning on steady-state dynos through the full EFI University certification course, so perhaps I could help out there as well. Quote Link to comment Share on other sites More sharing options...
z-ya Posted November 5, 2006 Share Posted November 5, 2006 I work through HolyRoller Dyno. They have a Dynapack, which is an incredible piece of test equipment. It's just a matter of getting together enough cars that need tuning, to make it worth their while. It's portable, so they can bring it anywhere. Quote Link to comment Share on other sites More sharing options...
Gavin Posted November 5, 2006 Author Share Posted November 5, 2006 Yes I'm a big fan. Quality Kiwi-made equipment Add my car and my friends MK1 Miata to the list. Might have a turbo 20v Corolla wagon ready by then also. Quote Link to comment Share on other sites More sharing options...
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