First off, hi guys. I'm new here. Well sorta; I frequented the forum like 5 years ago but I've been gone for so long that i feel brand new again - even forgot my password and despite the site saying it emailed me a new one I have yet to receive any emails so I just up & made a new account, lol.
Anyways, I've currently got my motor out and am doing an engine bay overhaul I have MSII (not sure what version though; I bought it a few years ago...) and have read here and there about people using MSII as a full standalone and then deleting the factory ECU. I'd LOVE to do this but I'm not certain what all is required to do it successfully. That's where, hopefully, you come in! What are the steps to make this happen?
#138642, "RE: Deleting stock ECU?" In response to Reply # 0
I removed the factory ECU and all OE wiring years back. This car has been an on going project and FINALLY getting tuned for the streets after about 6 years next weekend.
Anyway, it depends what all you need to still operate? Do you have emissions testing where you live?
For the alternator, since the stock ECU triggers it, you can get an old school Mopar unit that all it needs is 12v to trigger to the alternator to charge the battery.
I ran a 9v output for my MS1 ecu to power up the speed sensor so that would still work.
There is also a 5v output that powers the TPS.
Tach output installed on ECU to drive OE tach as well.
OE fuel gauge will still work hard wired from cluster to sender.
Everything else I ran relays for off of a universal junction block from Summit Racing ($50). Ignition, ECU, ECU controlled cooling fans, power windows, gauges etc.
Brake lights are hard wired from switch to lights, turn signals are hard wired from lever using a universal flasher unit and headlights are ran off a relay/switch. I will post up some pics of some shit I did soon, I will be at the shop working on it tonight...
#138643, "RE: Deleting stock ECU?" In response to Reply # 1
Sounds doable! A lot of re-wiring but definitely doabl Was there ANYthing else that would need rewired? I deleted the A/C. I've read that some ppl apparently use MSII as the voltage regulator - do you know if that is an added feature they started doing or something? Suppose I should just email them directly to find out....lol
As far as doing all the rewiring; do you recall any of it being more difficult than others?
#138645, "RE: Deleting stock ECU?" In response to Reply # 2
I did similar modifications as Mike to give my self two independent systems (switch in between for emissions testing). I ran the alternator off of a voltage regulator from a Dodge Omni. That worked fine, but I had to buy a couple brands before I found one that offered stable regulation. I put a board in the upper case of the MSII to house a 5V regulator and 9V regulator to run sensors. MSII ran fuel, ignition, and IAC. Near the end, I had a circuit to raise idle RPM before engaging the A/C compressor. If you want to completely remove the stock ECU, you should look through the electrical diagrams for the MFI system and find a way to supply all of the outputs provided by the stock ECU. Otherwise, you'll probably miss something and waste time diagnosing a mysterious condition.
I have MSII (not sure what version though; I bought it a few years ago...) and have read here and there about people using MSII as a full standalone and then deleting the factory ECU. I'd LOVE to do this but I'm not certain what all is required to do it successfully. That's where, hopefully, you come in! What are the steps to make this happen?
