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[patsmx5]

*CLIFFS at bottom*

So my car's been down for weeks cause it's been running on like 1 or 2 cylinders. Well, today I did some troubleshooting and turns out, it IS getting spark on all four consistantly. Blah blah blah for 5 paragraphs explaining the tedious troubleshooting I did over the course of two hours.

Then I tried removing the noise filter I installed inline of my megasquirt. Presto, it seems to be running normal*. So a friend and i went riding for a while. Still does this weird cutout thing when going into full boost sometimes though. But sometimes it don't. So as I'm pulling a u-turn, I tell my friend "watch this, fixing to throw a rod" and then proceed to haul ass through two gears. It was awesome, car was HAULING ASS! And then, at about 7K in 2nd, motor goes to running on 2/3 to 4/5 of a cylinder. Pull over and it dies. Look everything over, everything looks fine. Key off, on, restart, runs fine. Drove home, boosted a few times, it's ok.

So apparently, noise is somehow messing up the ecu, causing it to kill fuel and go haywire. And adding a noise filter made this worse, not better. Gonna run a wire from somewhere else to feed the ecu power tomorrow and see what happens.

CLIFFS: Damn mazda, boost is great though.

*normal being only has a slight misfire that it's always had since I put low ohm injectors in a year ago

[bryantaylor]

were you on MS1 or MS2?

[Kain]

what kind of ignition setup do you have?

what kind of wires are you using? are they shielded?

megasquirt plus rotary ignition owned my ass for about a month.

[BoostForLife]

get some resistor spark plugs and then see what happens. You're getting interference from your spark plugs. Levi's hx52 was causing the rpm pick up for the dyno to freak out until resistor plugs were put in.

This should/will get moved to hybrid tech of FI section.

[patsmx5]

Running MS2. Running resistor plugs. Running a ford EDIS4 ignition system. And I've tried 250 ohm MSD wires, 5K ohm Bosch wires, 6K ohm OEM NGK wires, and OEM (OEM to the EDIS system) 25K ohm wires and it makes no difference.

[patsmx5]

This thread is now about rebuilditng a RX7 clutch type LSD for my miata.

Ok, so I bought a carrier w/LSD removed from an 87' RX7 for 150+ shipping. Ended up being 215 shipped I think. Turns out it has 4.10 gear in it, where my miata has 4.30's. So a little bit higher gearing will be nice as first gear is useless at 10 PSI. Yesterday I tore it down and measured all the drive disk, friction disk, cone springs, etc. Turns out almost everything is exactly in factory spec. So I don't really have to buy new clutches and shit as they all measure 1.99-2.00mm (factory spec is 2.00mm, service limit 1.90mm). So I cleaned everything up, measured the total thickness of the LSD vs. its' carrier and the clearance for the differential per the FSM, and then reassembled.

Next I wanted to test the break away torque of the LSD. Factory spec is 50 ft*lbs new, but they wear and usually measure less. But there was no easy way to hook a torque wrench to the thing to measure it. So, I built a RHMT preload testing tool.

Found a piece of plate. Drilled two holes in it, then drilled one in the middle 3/4 inch. Found a big fucking 3/4" lag bolt and cut it off, dropped it in the 3/4" hole, and welded it out. Took 30 minutes start to finish to make the tool.

First it measured 26 ft*lbs to slip. Weaksauce. So I cut a shim out of some .014 aluminum sheet metal scrap I had and stuck that in there. Now it's up to 46 ft*lbs. Then I remembered you're supposed to torque the ring gear before measuring it, as that causes the number to go up. But I knew it needed another shim anyways, so I cut another .014 thick shim and tried again, this time torquing the ring gear on. Now she don't slip till somewhere north of 150 ft*lbs. Probably 170-180 ft*lbs if I had to guess, as I can make it slip with a bit more force after the wrench clicks at 150.

So yeah, this maita is fixin'a have one badass LSD.  Gonna set up the rear end myself this weekend. Got a set of 6-12" micrometers, a magnetic base dial indicator, and GM gear marking compound.