74Adam Posted April 19, 2014 Share Posted April 19, 2014 Hey guys, I am getting started on my megasquirt journey and will probably be asking some stupid questions so please cut me some slack. My situation is that I have a car with MS already installed and "setup" but it barely runs. I was under the impression that I would be getting a car back that was dialed in and ready to go, at which point I could learn the intricacies of MS at my own pace. As it turns out, I am going to have to figure it out myself. Maybe that's just as well. I have the megamanual and have been reading through it as well as reading a lot of old posts on here. I have tunerstudio loaded and have been playing with it for the last couple of weeks. I hooked it up to the car last week to pull the existing settings from the MS and saved it in a file so I have a reference (even if it obviously isn't a great one). The car: 78 N/A 3.0 liter, mild performance build Everything is stock except the 240SX TB "Dumb" cold-idle valve Fuel only (for now) Firmware: V2.600 So, the guy set the dwell at 1.0ms, which seems low (acceleration compensation of 0.2ms). The megamanual says a rough range is 2-4 and I have seen many posts on here that seem to reflect that, but most people are using aftermarket coils. I'm thinking I could set it at 2.0 or even 3.0 without toasting anything. Would appreciate any thoughts. thanks Quote Link to comment Share on other sites More sharing options...
NewZed Posted April 19, 2014 Share Posted April 19, 2014 Pretty sure that "dwell" is an ignition coil charging term. If you're running fuel only you wouldn't worry about it. If you're planning to control ignition and asking for that then, somewhere out there on the interweb, and in Hoffman and Cramer's book there's talk of the finger test method. Increase it until the ignition modules get warm, then dial it back a bit. Or there's math yu can do with your coil's specs. Quote Link to comment Share on other sites More sharing options...
dexter72 Posted April 20, 2014 Share Posted April 20, 2014 You may have to check out your f.i. setup, if your engine is barely runs. Quote Link to comment Share on other sites More sharing options...
74Adam Posted April 20, 2014 Author Share Posted April 20, 2014 Sorry, that really was a stupid question....lol. Sometimes you get so wrapped up in this stuff you can't see the forest for the trees. Dexter, I'm sure you are right. I feel comfortable about a lot of my settings but I am struggling with the PWM stuff. My understanding is that if you have resistors in series with the low Z injectors (like the stock Z has) that you don't need it. But, you have to enter something. My settings are as follows: injector open time-1.0ms, battery voltage correction-0.20, PWM current limit-75%, PWM time threshold-1.0ms and PWM period-100. I just re-read the megamanual on injector criteria and realized that I may need to set the time threshold to 25.4ms. Essentially, treating the injectors as if they are high Z. Do I understand that correctly? Quote Link to comment Share on other sites More sharing options...
mattb3562 Posted April 20, 2014 Share Posted April 20, 2014 If you do have resistors inline, Change your current limit to 100% and time threshold to 25.4. Quote Link to comment Share on other sites More sharing options...
74Adam Posted April 22, 2014 Author Share Posted April 22, 2014 Thanks Matt. Do you think the default setting of 66 microsecs for the PWM period is ok (with resistors)? Quote Link to comment Share on other sites More sharing options...
mattb3562 Posted April 23, 2014 Share Posted April 23, 2014 I would think it would be close enough to start running. I think mine was at 50 using the PWM circuit Quote Link to comment Share on other sites More sharing options...
74Adam Posted April 30, 2014 Author Share Posted April 30, 2014 Since I am running fuel only, do I need to be concerned with any of the ignition settings? Obviously, I would set the trigger wheel=0 (i.e., no trigger wheel) and I would set the rev-limiter algorithm to "none" since I have no control over that. But what about the settings under "ignition options". Do I need to worry about any of these? There is setting called "coil charging scheme". This seems relevant since "standard coil charge" is one of the choices. Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted May 5, 2014 Share Posted May 5, 2014 With 2.6 firmware, just ignore the ignition options. If you don't have it up and running yet, consider swapping to MS2/Extra 3.3.1 firmware - it's a bit easier to set up. Quote Link to comment Share on other sites More sharing options...
74Adam Posted May 5, 2014 Author Share Posted May 5, 2014 Thanks Matt, I'm going to keep on it a bit longer but I'll keep that in mind. It's just going to be a slow process for me either way I think :-/ Quote Link to comment Share on other sites More sharing options...
NewZed Posted May 5, 2014 Share Posted May 5, 2014 https://www.diyautotune.com/softwarelinks.htm Quote Link to comment Share on other sites More sharing options...
74Adam Posted May 5, 2014 Author Share Posted May 5, 2014 Thanks ZED. Quote Link to comment Share on other sites More sharing options...
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