hi i'm looking at going the megasquirt route but need some help, if was anyone could answer a few questions for me. My car is a 1994 Mercedes 320e with a 3.2l m104 engine, which has a HFM-SFI system.

1. What type of ignition system does the 320e- where is the crank angle sensor (CAS) and what type is it (Optical/LED Sensor? Hall Sensor? VR Sensor?)

2. How many teeth/windows/slots and what orientation does the CAS crank trigger? (any missing? all evenly spaced?)

3. Does this engine have a fast idle valve (IAC)? If so, how many wires are connected to it?

thanx in advance

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so no information on this then?

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Hi taint,
The crank sensor is located by the transmission bell house. It's a VR sensor. Their should be three events every 360 degrees spaced at 120 deg like the M103 but I'm not 100% sure of that.

If you want ignition timing control your going to have to run EDIS. You can use to original coils as long as the primary resistance is about the same as the stock EDIS coils. Just mount an EDIS trigger wheel to the balancer. and you can get both of your signals from there.

The M104 uses a stepper motor directly driving the throttle to adjust IAC. You probably want to consider dumping it and getting a mechanical TB and separate IAC as they are badly designed and cost a ton to replace when they fail.
Adam

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320

thanx alot adam, i really don't want to go the edis route i see as last resort, i figured if the bmw boys could get away with ms 2 extra running there stoke efi and controlling there vanos nonsense, we should be able to do the same, i was informed that the ms2 extra code can run any trigger wheel configuration as long as you what your car runs.

By the way how is your project going i see the power figure you are aiming for has increased by 150bhp, so when is it hitting the road, i have been keeping eye on your car since the 400bhp days

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Yeah, you could go that route I guess. I am a little concerned that the factory EZL ignition may be referencing cyl. 1 TDC from the pickup on the balancer as well. If that's the case it may be a little tricky to get that one to work.

Three things that are nice about EDIS is:
1. It's a separate system from the MS2 which means less chance of bugs.
2. A 32-1 trigger wheel will give you more precise timing input thus more precise output. (I believe BMW's use a 60 tooth trigger wheel.)
3. Easier than what you are proposing.

I'd say the next step for you to do is figure out what your getting from your outputs. I'd suggest hooking up an O-scope to the VR(s) and see what the output is. If you'd like, I have done this on the M103 a while back and will be glad to send you a PDF of the output graphs. (I can't convert it to JPG because no software works with my Vista64) Maybe I'll get around to graphing the output of my M104 here sometime soon.

As for my project... I was a little concerned in the beginning that the stock crank and rods couldn't handle more than 400HP based on other peoples info. However after reading Roman's posts I'm completely convinced I can run 550HP without killing the crank and rods. All my other components are up to the task so I figure, what the hell! As far as ETA, I have the money, now I just need more time..... Well, and a clean shop. It's filled with so much junk right now.

__________________
Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320