Any tips for installing a MegaSquirt kit???

[Kyle in NO]

OK, so I just bought a Mega Squirt kit from DIYAutoTune.com. Anyone with one of these have any tips for me? Gonna go at this on my own!

[GregATL]

Yeah, don't f*ck it up.

Seriously, be very patient and don't attempt the physical install until you've gone through all the wiring with a fine tooth comb.

But you already knew that.

[Jimmie G]

Kyle I have been thinking about the mega squirt also I will go today and see if I spot any doors at the yards for ya.

Jimmie

[altus22]

Are you planning on chopping a harness or making your own?

I'm building the coil drivers and VR circuit today. Hopefully I'll add spark to my car by summer.

[RDAvena]

wiring up the MS to the e28 is not that hard. I retained the use of the main, FP relay, starter/alternator harness and the connection to the fuse box. Kept the water temp wiring frrom the seensor to the fuse box connection as well.

You can get away with buying just the pig tail wiring harness for the MS and splice this into the stock harness. All you will need to the MS ecu will be 4 grounds, 12 volts acc, you can keep the fuel inj connections and just run extra wiring for the air temp sensor, WB O2, and the RF sensor.

I grabbed an aux air valve from a 320i and this takes care of the idle.

[Kyle in NO]

That's the plan RDAvena! I hope it is as easy as I think it is! I plan on housing the MS stuff inside of a Motronic ECU box, utilizing the box's large male connector as the interface. This would allow plugging right into the factory harness with no cutting!

[M635CSi]

That's the plan RDAvena! I hope it is as easy as I think it is! I plan on housing the MS stuff inside of a Motronic ECU box, utilizing the box's large male connector as the interface. This would allow plugging right into the factory harness with no cutting!

I think that's a fine idea.

[altus22]

If you manage to get that connector off, you'll be able to carry a motronic ECU in the trunk for peace of mind...not that you'll need it. Depending on which code you're running, you should be able to run your stock IAC. There's a circuit on the megasquirt site telling you how to deal with 3 wire Bosch valves. The circuit can be found here, but you'll have to scroll down a little to find it.

[russc]

Its still unclear if that circuit for the 3-wire Bosch IAC works yet.

RussC

If you manage to get that connector off, you'll be able to carry a motronic ECU in the trunk for peace of mind...not that you'll need it. Depending on which code you're running, you should be able to run your stock IAC. There's a circuit on the megasquirt site telling you how to deal with 3 wire Bosch valves. The circuit can be found here, but you'll have to scroll down a little to find it.

[Maddog]

I have my car running on megasquirt and I am using the two wire IAC that came with my 533 and it works great. I suggest you grab one from the junkyard.