Megasquirt is on the way.

[bjl4776]

JonK took the trip up and bought my M50 off of me today. I have been plannin on put megasquirt on my 95 325is for sometime, but have lacked the motivation to spend the money on it. We'll I finally ordered it today and the parts should be here within the next week. Im using MS for both fuel and ignition, and Im doing it on a vanos motor that is relatively stock for now. So if anybody wants to try this on a M50 i will have the base fuel and ignition maps for the stock motor. Hopefully I can figure this thing out without too many headaches, but we will see. And all this just a few weeks away from picking up my 95 Dakar yellow M3, so much automobile fun so quick. My wallet is just burnin away.

[kyleN20]

about homew much are the e36 m3s running for now?

[bjl4776]

Iv seen them for 9-19k. If you want the the OBD-II low mileage, your looking at spending over 15k. I wanted the OBD-I, so 95 was my only option, and mileage wasnt as much of a concern as condition as I don't mind the maintence. The one im pickin up is 9.5k, but has a mint body, paint, and all service records. I havent seen many 95s in this kind of condition, but the guy just needs to get rid of it, but he isnt advertising it. I heard about it because he is a friend of a friend.

[bahnstormer]

boo on odb2

[kyleN20]

thats sweet, id like to drive one of those

[Booster]

Very cool BJ.,
I plan on using MS ,but only to run dual added injectors via a boost signal/MAP sensor. From all I've read, most installs have gone great and they love them.I know of at least 7 built cars running them now for over a year and no regrets yet !
keep us posted..........Vinny

[Jon K]

Very cool BJ.,
I plan on using MS ,but only to run dual added injectors via a boost signal/MAP sensor. From all I've read, most installs have gone great and they love them.I know of at least 7 built cars running them now for over a year and no regrets yet !
keep us posted..........Vinny

Brandyn, nice! I knew you mentioned buying it but I didn't think you would be doing it the day after I bought your motor Nice man, the most fun part is building it honestly. Still putting my car back together. You said you will have the base maps for fuel for the M50? I'd like to see those. Timing as well.

Booster - you want to run additional injectors supplemental to the the stock DME? That's a bad idea - MS is not really designed to do that - it can, but the whole purpose of the unit is to standalone control the fuel and or timing. You will have a hell of a time dialing in the megasquirt while the stock DME is adapting the stock injectors...

[Booster]

Brandyn, nice! I knew you mentioned buying it but I didn't think you would be doing it the day after I bought your motor Nice man, the most fun part is building it honestly. Still putting my car back together. You said you will have the base maps for fuel for the M50? I'd like to see those. Timing as well.

Booster - you want to run additional injectors supplemental to the the stock DME? That's a bad idea - MS is not really designed to do that - it can, but the whole purpose of the unit is to standalone control the fuel and or timing. You will have a hell of a time dialing in the megasquirt while the stock DME is adapting the stock injectors...

Hmmm. I see what you mean. I was wanting to avoid commiting the car to a standalone for now and just use the MS as a seperate signal reader for when the boost is signaled.
Are you saying that the stock ECU will sense boost or perhaps be unable to operate under boost ?
I was hoping it wouldn't recognise any boost and the MS could control additional fuel needs to the supplimental injectors alone ? AM I wrong here ?
Maybe I should just follow your steps carefully while you do the MS install and do the same. Afterall........its not as if the car is new for crying out loud. How can it devalue its self if it runs strong and is properlly tuned ? It won't really..IMHO,anyway.
I won't run boost above 10 psi for my needs .....so talk to me about this.Please.....
..........Vinny

[pyro]

quick q about ms... Can you ever plug in your stock ecu to smog your car?

[Jon K]

Hmmm. I see what you mean. I was wanting to avoid commiting the car to a standalone for now and just use the MS as a seperate signal reader for when the boost is signaled.
Are you saying that the stock ECU will sense boost or perhaps be unable to operate under boost ?
I was hoping it wouldn't recognise any boost and the MS could control additional fuel needs to the supplimental injectors alone ? AM I wrong here ?
Maybe I should just follow your steps carefully while you do the MS install and do the same. Afterall........its not as if the car is new for crying out loud. How can it devalue its self if it runs strong and is properlly tuned ? It won't really..IMHO,anyway.
I won't run boost above 10 psi for my needs .....so talk to me about this.Please.....
..........Vinny

The stock ecu uses a MAF, which understands air flow but not air pressure. The MS ecu uses a MAP, which understands air pressure... The stock ecu will operate with boost etc, many people have a chip burned for their setup. However, i wasn't talking about hte stock ECU not working under boost, but what happens is, your car monitors the O2 sensor and add/subtracts fuel to make sure the output is stoichiometric, or close. So if you have MS adding fuel to the engine and stock ECU doing fuel as well, the stock ecu will see a rich condition and subtract fuel, which is going to really throw off the MS unit since it is adding fuel and the stock is subtracting and the AFR is going up and down at similar times.

Also - the stock ECU adapts... meaning, at full throttle it runs from a pre-programmed fuel map but sometimes in part throttle it runs off of AFR-target, sort of. So, gradually, over miles, it will trim or add fuel by instinct and with MS doing its thing, it will get real confused.

Also - something you probably have not though of yet - you can't just hook MS into stock injectors. You would need to add injectors... but since the motors are direct port injection... you'd either need to add 6 additional injectors, one to each port (good luck) or do throttle body injection which is really a step backwards in technology.

Finally- just because you use MS does not mean you're running a "standalone". You can run MS for JUST timing, JUST fuel, or time AND fuel. So, you can literally got the wires from the stock ECU to the injectors, and splice them into the megasquirt. Stock ecu won't even know they're missing, it will send signals over dead wires. Meanwhile, MS is triggering your injectors and you are ready to go. If you're running 10psi I hope you have 30# or larger injectors.