megasquirting an omlet

[saw wave analog]

well i think i may have found whats been causing my problem, and its something i didnt think i would have to deal with... plus i have learned a whole lot about how megasquirt extra deals with ignition input in the past few days....


the fact that ive never read about this being necessary before has made me wonder... has anyone ever actually done this before?


ive seen a few people that said they are doing it, or were going to do it.. but has anyone on here ever actually gotten a car running on the stock distributor/wheel/hall sensor before?


because ieither i just wasted 2 hours, or i found why the car hasnt been starting.

ill save the details for the time being because im tired and have been drinking for the past couple hours lol so when i got back to the place where i am now and where my omni is i didnt feel like trying my creation



as ive said before.. as soon as i get the ****er sorted ill post up details. and if this turns out to be the thing thats been giving me my issues... its a pretty god damn critical piece of the puzzle.

[Shadow24V]

it usually is, it took me about a month and a half to get spark on my 24v due to the ass-backwards Mitsu wiring. once i got that figured out it was into fuel #s. Good job so far though, at least your enigne bay looks neat, mines a birdsnest of wiring lol. you'll get her going soon enough.

[XR Tuner]

Check out this post. It should answer all your ignition problems.
possible Megasquirt and EDIS kit: who is interested?
Just to let you now,if keep running your wideband with the bad turbo seals the excesive oil is going to ruin your sensor.

[saw wave analog]

i have seen that link and it has some decent info taken from a few megasquirt sites, but it is not accurate as far as getting the ignition setup. i pm'd that guy a while ago with no response, id like to hear from him in this thread on how he got it working with a 12 degree triggle angle... i am betting that he was planning on doing the setup but never did, because there is no way a stock distributor could run with a 12 degree trigger angle.


my painful and frustrating discovery (lol) is that the stock ecu reads the trailing edge of the shutter wheel, and megasquirt is only set up to run off of the leading edge of the wheel... the distributor has to be rephased. that what i was talking about in my last post but didnt want to mention until i tried it, but i put 30 miles on the car today with it running like stock on a generic set of fuel and spark maps.

there may be another way to do it, im definately not a master of this craft, but i spent a week trying to get that ignition set before it hit me that the shutter wheel/rotor relationship stock is designed so that the trailing edge of the wheel crosses the hep pickup when the rotor crosses the plug wires. using the leading edge places the rotor halfway between the plug wires and was leaving me with a shitty/nonexsistant spark and no amount of playing with the trigger angle settings helped.


i rephased the shutter wheel and it fired right up.


easy to do with a knife a nail a hammer and some jb weld.




anyway, im calling this case closed haha.. the car is up and running under full megasquirt fuel and spark control using 100% stock ignition stuff.



ill get started on the writeup soon

[crazymadbastard]

Can't wait for the write up! Is the factory tach pretty easy to run off ms?

[Abu Fayed]

Quote:

Originally Posted by crazymadbastard Can't wait for the write up! Is the factory tach pretty easy to run off ms?

You'll need to build a small circuit in the proto area on the board. If I remember right, it's a 2n222 transistor, a diode and a variable resistor. Really easy to build. Or you could try running the stock tach right off the coil, but I don't know if they could handle that or not. I'd experiment on a spare cluster.

[saw wave analog]

i havent messed with getting the tach connected yet actually. im hoping i can run it straight off the coil, im going to try it with a spare cluster i have laying around, but not for a few days cause its going to be a little while before i feel like working on the thing again haha.. i just got done spending every waking minute for a couple straight in the garage messing with this terd.. i am taking a break


i had it out cruising last night and it got a lot of complements from the local guys.. the engine bay looks damn good now.. it was definately worth the extra time it took to build the new harness

[saw wave analog]

the car is running like stock around town


it needs work on the cranking pulsewidths and afterstart enrichments because it takes a couple seconds to get it fired up as it sits now, and low rpm / high vac high rpm maps are way rich.. 11 and 12 to one rich, so ill start working on those soon


im not setting it up for boost until i get all of the driveability stuff nailed down. i figure its better to spend my learning time on the parts of the maps that wont launch a rod into orbit if i screw something up





it is so incredibly nice to have this amount of control over everything.... its all right there on the laptop.. im just getting into the actual tuning part and i already cant imagine going back.


now that most all of the assembly work is done i should have time to start writing soon. ill try to make some time after work a couple nights this week

[vcrpro3]

Anyone in the Phoenix area have a Megasquirt up and running that they would'nt mind showing myself an a friend how they look assembled and installed?

[saw wave analog]

every installation is going to look different. it is completely possible to reuse all of the stock wiring and the car will look exactly as it did stock, its also possible to build a completely new harness. all of the other existing td megasquirt installs i know of utilize a wasted spark setup which changes things around a bit and adds a coil pack so they look somewhat different


the ecu itself is just a little box like the stock lm's

there isnt really much to look at

[saw wave analog]

well, i finally got comfortable enough with the cars reliability around town so i set up the map for boost finally....


holy hell what a rediculous difference... it feels like the thing is pulling almost as hard at 10 psi as it was on 20 last year.. 10 psi felt like almost nothing on the stock stuff, and now it gives that holy crap throw you back in the seat feeling

the tune is still rough and im not taking the boost any higher until i get it smoothed out some more... but man... what a nice difference it made!


cannot wait to get the terd to the track..

[R/Tony]

Quote:

Originally Posted by saw wave analog well, i finally got comfortable enough with the cars reliability around town so i set up the map for boost finally.... holy hell what a rediculous difference... it feels like the thing is pulling almost as hard at 10 psi as it was on 20 last year.. 10 psi felt like almost nothing on the stock stuff, and now it gives that holy crap throw you back in the seat feeling the tune is still rough and im not taking the boost any higher until i get it smoothed out some more... but man... what a nice difference it made! cannot wait to get the terd to the track..

We cannot wait to see your writeup man !

[saw wave analog]

hehe sorry guys, ive been working a lot lately, and still have some small stuff to do on the omni... not to mention driving it and tuning on it lol, so i havent had much time to work on the walkthrough.. but i just spent a couple hours on it, so the process has started... its going to be fairly long so it will probably be a week or so before its ready unless i get a big chunk of free time anytime soon... but dont worry, it is definately coming soon


im just going to post it as a new thread in this section of the forum, hopefully the moderators will let me add to and edit the original post as the thread goes on and new stuff is discussed/discovered whatever

[saw wave analog]

still working on the writeup. slowly but surely. its a lot more of a pain in the ass that i thought it was going to be actually.


i decided that after an entire year of an open downpipe and a firewall full of holes causing large amounts of exhaust to pump directly into my lungs... i should probably get some kind of exhaust.. went over to some friends garage tonight and welded up the most ghetto ass exhaust i think ive ever seen.. but the one bend is mandrel, and even if i cared what it looked like.. its on the bottom of the car anyway. it exits right in front of the rear drivers side wheel.


i also got a good/funny pic of the omlet with my friend nick's retarded nice sr20 s14 240sx/silvia clone and a nice 2g awd dsm my exhaust welding homie josh just finished building

even funnier than the contrast of the cars in the pic is knowing which one is fastest.......










heres another one showing how my having never washed the car is paying off








i also got a few good shots of the finished engine bay with a good camera so ill post them up whenever josh decides to upload them



and the megasquirt writeup is coming along. i am actively working on it.. its just going slow. it will be up when its ready

[Low Impedance]

the day you get the write-up, im printing that thing out!!

for my omni build, i plan to dive straight into a MS unit and not bother dicking around with the factory harness, seeing it will be easier to do while im building the motor and cleaning up the engine bay.