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Old 12-07-2010, 10:10 PM   #41
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Tried the other cas and no dice.... I'm not going to touch the caps, after reading Joe's ordeal w/ the cas and the abefm circuit. Time to order a trackspeed wheel, sigh. Has anyone actually been brave enough to grind a tooth off, cut a tooth off the cas and run it as 12-1 on a megasquirt?
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Old 12-08-2010, 09:55 AM   #42
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I've run abe's circuit with much success. you just need to make sure you put it to falling edge.
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Old 12-08-2010, 03:23 PM   #43
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I'll give that a whirl tonight, pretty sure I had it set that way at first and it didn't work, but who knows. Went ahead and ordered a buncha caps from newark to mess with, it looks like its just not filtered enough, gets a big rpm spike before losing sync (to me that says its getting two pulses when it should be getting one). Do you know what values work well with a CAS? The 1nf ones that are in there work for a while, once clt is in the 145-150 range it starts doing it every 15-30 seconds, and just keeps getting more frequent the warmer it goes. Hopefully its just these radioshack ceramic caps... need to go ahead and get the trackspeed wheel coming anyway.

No great rush anymore tho, looks like we're going to put the new SC on my brothers car, prolly this weekend, so we'll have an SSM car to autocross this year. (of course its gonna need a 1.8 rear swap and clutch, weee.)
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Old 12-08-2010, 03:32 PM   #44
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i build abes circuit to spec and it was perfect with the NB sensors...dunno about CAS. i keep forgetting you are trying to do that.
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Old 12-14-2010, 01:32 AM   #45
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Yeah... tried 2.2nf caps, and got the same thing after it was more warmed up. I'm thinking that its just hopeless, Just don't do it. I haven't seen anyone that's actually happy with the abefm circuit on a cas...
I went ahead and soldered up the normal miata opto crank and pullup cam setup. Trackspeed wheel is coming, so I'll eventually change it back to the oe nb input circuit, but for now I'm thinking this will be enough for me to get a comfortable tune in, and drive the car a little.
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Old 12-15-2010, 11:49 AM   #46
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So anyway, got the other circuit built (the traditional one) And now it doesn't ever lose sync, Yay!

But, it doesn't want to start when warm. ****** idled like a damn champ and I got a little ve analyze live tuning done by dragging the clutch with the ebrake on (lol, I have a new clutch ready to go in and I didn't really do it that much).... I was all set to take it for a drive and it doesn't want to start, tries to start almost immediately, but then falls on its face when it gets off cranking pulse. Looked/acted really lean. so I bumped up the fuel in the idle cells. bumped it up some more... up to about 30% and it seems like its close to wanting to run now. but I'm at 95% ve. fail.

I pulled the coils off and they're still firing like champs. I'm thinking something wonky w/ the injectors? I f'd w/ cranking pulse, ASE, WUE.... none of it made a significant difference (adjusted within reasonable limits) It was running great then nothing... gotta be something hardware related, imo. Pulsewidths were where it had been when it was idling earlier, its just like its lean as crap now.

So I have some other injectors, prolly going to try those tonight... or I might clean some stock ones and try that, idk.
It just doesn't make sense, and I feel crazy blaming the injectors... but I can't point at anything else. As it was getting up to temp, I killed and restarted it a few times and it'd light right off... The other thing that makes me thing I need to try different injectors anyway is that I'm basically using the diyautotune 94-95 sequential maps, and had to set my req_fuel to 14+ to get it run right. I'm using rx8 yellow injectors (that I have cleaned in my ultrasonic cleaner while pulsing them with a basic stamp driving a tip120.... cleaning actually helped smooth it out a lot)

Last edited by ianferrell; 12-15-2010 at 12:06 PM.
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Old 03-11-2011, 07:52 AM   #47
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Looking to build an MS3 + MS3X for a '95 1.8 soon.
Thinking about the spark outputs, would using ABCD from MS3X and splicing them in pairs to 1g and 1h on the 64 pin work? That would be using the OEM coils.
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Old 03-11-2011, 07:57 AM   #48
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No, take 2 of the MS3X's outputs and connect them to the 2 coils - each coil fires 2 plugs, but it's wasted spark so you only need 2 signals.

If/When you convert to COPS you can use 2 more of the MS3X spark outputs and run full sequential.
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Old 03-11-2011, 08:11 AM   #49
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Okay, so A=1&4 to pin 1g and B= 2&3 to pin 1h. Or is it A=1&3 and B=2&4
Tunerstudio set spark to "Wasted Spark".

Trying to get the build straight in my head first.
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Old 03-11-2011, 08:23 AM   #50
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1&4, 2&3 just like it is stock when you look under the bonnet
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Old 03-11-2011, 10:23 AM   #51
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Has anyone actually done that before though? I never tried it. If it was me I might build the traditional LED spark outs and not use the ms3x for spark until you can go sequential. Post here if it works though
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Old 03-11-2011, 10:30 AM   #52
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No, since only like 4-5 guys are even on MS3X and all went seq.

but that's how you'd do it, use spark A & B and wire to each pair. Use the LED circuits for something else... why go out of your way to wire up circuits that are already built on the ms3x board?
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Old 03-11-2011, 10:42 AM   #53
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Quote:
Originally Posted by Braineack View Post
why go out of your way to wire up circuits that are already built on the ms3x board?
This, there's 8 available circuits on the MS3x you can use for driving ignition, might aswell put some of them to use.
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Old 03-11-2011, 11:31 AM   #54
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Thanks guys, that's one question answered.
As I wont need Joe's spark circuit, should I just follow the standard GUIDE Step28 a-g ? or do I leave this step out?
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Old 03-11-2011, 11:33 AM   #55
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that's not even the correct IGN output mod anyways.

I wouldn't follow that writeup personally per say...just populate this:

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Old 03-11-2011, 12:00 PM   #56
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So basically follow Franks' build leave out step 65 completely?
What's confusing me is following Franks guide and not needing Joe's IGN circuit, do I then install as per step 65 on the Megamanual or leave that out as well, due to using MS3x sparks?

Back on to CAS, same as above in step 50 ????? Franks CAM/Crank circuit or leave out?
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Old 03-11-2011, 12:14 PM   #57
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No one has written a guide for MS3 exclusively. but most of the MSII write-ups can be used, since there isnt much difference between the two, but firmware and features.

I didn't say follow Frank's guide, but I did say populate only those that I pictured from his guide. You'll need to then add the tach input circuit for a 4g6e CAS setup and you can pretty much be done with the mainboard, unless you wanna use the three LED circuits for something.

The MS3X will handle: idle, fuel, spark, and any other inputs/outputs you might add extra.
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Old 03-11-2011, 12:28 PM   #58
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Many thanks Brain, you're putting me on the right track.
Bit of a in electronics but smart enough for "monkey see, monkey do" assembly.
Might change R3 and R6 to 1% as Frank says for TunerStudio.
I might just be the first with MS3 + 3X in the UK.
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Old 03-11-2011, 12:35 PM   #59
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UK maybe, EU no.

Never tested my voltage reading on a DMM vs. TS.


Maybe one of these days I need ot make a MS3x NA & NB writeup
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Old 03-11-2011, 12:42 PM   #60
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Quote:
Originally Posted by Braineack View Post

Maybe one of these days I need ot make a MS3x NA & NB writeup
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