N/A Megasquirt Thread

[Hobbit]

Hi Everyone!
I have a little problem with a MegaSquirt V2.2 install... I have an e30 with an early jetronic M20B20 engine, and I've converted the ignition to a Wasted Spark setup. I've changed the cylinder head to a 200 type head, and an eta intake manifold, with a widened throttle body. The car runs fine if I step on the gas pedal, but ther's no idle at all...
Can anyone help me, how to set up or configure a closed loop pwm idle control (i use a siemens idle control valve)? Or somebody could send me a setup for an m20b20 engine? I would apreciate that... Thank you

[nando]

Anyone run Alpha-N on a daily?

I will be converting my M42 to MS and maybe running Alpha N and running ITB's. I want to know what drive ability is like with Alpha N compared to MAP.

you can use MAP with ITBs. or a blended alpha-N/MAP load signal - MS2 & 3 have one built in, it's called "ITB Mode". Or just build a vaccum manifold and run straight MAP.

I don't think there's a particular reason to run straight alpha-N, except as a last ditch effort or on a full race car.

[Massimo]

Anyone run Alpha-N on a daily?

I will be converting my M42 to MS and maybe running Alpha N and running ITB's. I want to know what drive ability is like with Alpha N compared to MAP.

[nando]

there are several, although I can't think of any names..

[brn2ply7]

any one on here have n/a megasquirt on a 24v?

[nando]

I was thinking about it, but I see that costing a lot more than either modifying the eta harness or building a new custom harness and I think it will still take a lot of effort on my part. At that point, I'd need a donor DME, a donor 325i harness, and the PNP board. I might as well go custom... I think it will still be easiest to use a stock 325i trigger wheel & sensor though.


I can and probably will. It's just a matter of what costs the least/is easiest to implement. A board does exist that takes input from the eta sensors and converts it into a format compatible with megasquirt, so it is possible to use the stock sensors.


what kind of improvement is there to having the injectors fire as two separate banks instead of a single bank (what I was planning on)? I thought the only real improvement was idle quality? I read that even a single bank batch fire system doesn't really hurt power?

And yes, I know I need all those sensors. I'm really considering a custom harness using the diyauto harness... then the labels would be printed on the wires.

it can make a big difference because of the pressure drop in the fuel rail from firing all 6 injectors at once. It also makes a big difference if you're using large, high-z injectors. Getting them to idle when they're all firing at the same time will be tough. It also seems rather silly to try to avoid alternating fire just because of a couple wires, the second driver is already built in.

the PNP kit comes with it's own motronic connector, you'd only need a harness, and crank wheel/sensor which you would need anyway. Starting with the DIY harness would certainly be better than the eta harness, but I think a good used 325i harness would be cheaper?

[nando]

it's pointless. you can do wasted spark without it, all you need are a couple $5 coil drivers (Bosch BIP373s) and somewhere to mount them.

it was the "hot" setup like 5 years ago, before MS really had developed built in spark control. think V2.2 boards, which were only meant to control fuel. Now you can buy a DIYpnp with everything built in.

you could also use an M30 harness, the M20 harness will fit but it's tight. M30s used the exact same 55 pin 1.3 ecus.

[deansbimmer]

Did M88s use 55pin motronic setups? If I were any of you guys I'd seriously be looking at the DIYpnp from www.diyautotune.com.

Whats wrong with EDIS? I thought that was the hot setup if you're doing wasted spark? No?

M88 uses the 35 pin motronic, same as eta. I've heard of people using an M20 harness with it when they go standalone, so PnP may still be a viable option... Need more specific information sources...

[Cyrix2k]

I would just change to the 325i harness, sensors, crank wheel, etc. and use a DIYpnp. simple and robust. the eta harness isn't going to be that useful with the 35 pin connector.

I was thinking about it, but I see that costing a lot more than either modifying the eta harness or building a new custom harness and I think it will still take a lot of effort on my part. At that point, I'd need a donor DME, a donor 325i harness, and the PNP board. I might as well go custom... I think it will still be easiest to use a stock 325i trigger wheel & sensor though.

also, whyt wouldn't he just swap out to a M20B25 crank pulley and use that for crank reference?

I can and probably will. It's just a matter of what costs the least/is easiest to implement. A board does exist that takes input from the eta sensors and converts it into a format compatible with megasquirt, so it is possible to use the stock sensors.

he could but it still needs wires, and you still need things like a real TPS, a coolant sensor, IAT, etc. etc. It's just easier with the later harness. also etas fire all 6 injectors at once, B25s alternate in banks of 3 which isn't fantastic but it's certainly an improvement. Along with all the other improvements starting with an eta harness would be a waste of time.

what kind of improvement is there to having the injectors fire as two separate banks instead of a single bank (what I was planning on)? I thought the only real improvement was idle quality? I read that even a single bank batch fire system doesn't really hurt power?

And yes, I know I need all those sensors. I'm really considering a custom harness using the diyauto harness... then the labels would be printed on the wires.

[nando]

yes but you'll have to figure out what pins should go where between MS and Motronic, and of course build it, and add modifications, etc. etc. There's a few writeups on your own PnP setup. I've created a chart that shows how I built mine:

http://www.325ix.com/megasquirt/MS_to_Motronic/ms_to_motronic.html

otherwise they're pretty reliable - it's been about 3 years with mine. Hell, maybe even more reliable, since when something goes wrong, you plug in a laptop, see exactly what's happening and fix it.. with the stock computer you're shooting in the dark most of the time, or relying on the somewhat useless check codes.

of course this is assuming you don't fuck something up to begin with (wiring, soldering, etc).. which is why I like telling people about the DIYpnp option. So many people get screwed up on the hardware side that they never get their car running well enough (or at all) to take advantage of the power and options before them..

[weaksauce]

sorry for all the questions, but i have more.

How reliable are these setups? I can solder just fine and reading a schematic and wiring isn't a challenge either. My only concern is that i spend the money to build this and then it is a nightmare to keep running.

Also if i have a few spare 55 pin DME's whay couldn't i just use that for a "direct plug in" setup? is that possible?

[nando]

what is this DIYPNP you speak of?
link?
also, whyt wouldn't he just swap out to a M20B25 crank pulley and use that for crank reference?

http://www.diyautotune.com/catalog/diypnp-bosch-55pin-unassembled-kit-p-385.html

he could but it still needs wires, and you still need things like a real TPS, a coolant sensor, IAT, etc. etc. It's just easier with the later harness. also etas fire all 6 injectors at once, B25s alternate in banks of 3 which isn't fantastic but it's certainly an improvement. Along with all the other improvements starting with an eta harness would be a waste of time.

[Jaxx_]

again, in english please? EDIS? can't delay timing for an alternate table?

EDIS is ford's coil pack spark system. if it doesn't have input it does a limp mode of 10 BTDC, aka no full spark cut if you want it. so no anti-lag or well controlled 2 step

[weaksauce]

I would just change to the 325i harness, sensors, crank wheel, etc. and use a DIYpnp. simple and robust. the eta harness isn't going to be that useful with the 35 pin connector.

what is this DIYPNP you speak of?
link?
also, whyt wouldn't he just swap out to a M20B25 crank pulley and use that for crank reference?

[nando]

I would just change to the 325i harness, sensors, crank wheel, etc. and use a DIYpnp. simple and robust. the eta harness isn't going to be that useful with the 35 pin connector.