m42 on meagsquirt whats needed?

Post Mon Mar 30, 2009 3:32 pm

Hello, i was thinking of runnig my m42 on megasquirt what do i need apart from the ecu... the only mods i have are piper cams adj fuel reg, poss m3 throttle bodies???

Post Mon Mar 30, 2009 4:50 pm

just a loom or adaptor for the E30 loom plug realy, then just remove AFM and fit a pipe in its place, if your going with the M3 throttle bodies then you'd idealy need a airbox/plenum over them and then a large filter on that.

Dont know if you could use a map sensor aswell to your advantage, think when they do the "standalone" on the M3's they just map against Throttle position and RPM Alfa n

Post Mon Mar 30, 2009 5:35 pm

So don't you need at least a better TPS and possibly some kind of inlet vacuum sensor?

Post Mon Mar 30, 2009 8:13 pm

Inlet vacume sensor is the same as a MAP (manifold air pressure, or lack of pressure)sensor but no you dont need one.

The TPsensor is fine on the IS mines a standard one and its got loads of definition, i got 300+ sites when i set it up on my emerald.

Post Mon Mar 30, 2009 8:39 pm

When you say loom adaptor Matt, do you mean one that plugs into the OE ECU connector to adapt it to the MS ECU?

Post Mon Mar 30, 2009 9:07 pm

You could do it like that or make a new loom what ever.

i bought a spare ecu choped all wires off then soldered each wire from the emerald plug to the correct pin on the bmw loom to make and adaptor, like the ones you get for a head unit to go from DIN to Sony/alpine/clarion, means if i ever want to run mine standard or to sell it as an origonal IS then i havent burnt my boats and i can still remove the ecu from the car as the emerald unplugs from its look plug of the adaptor, it was only about 30 wires and then i made another small loom for the Map sensor and charge cooling pump switch.

Ive seen it done with mega squirt and m20s so sure it would work on a IS to.

i did have a picyutr some were i'll have a look.....

Post Mon Mar 30, 2009 9:50 pm

Nice one cheers bud. One of the companys that import the MS systems is less than 3 miles from my house so I might go and have a chat with them about it.

@Pharaoh: I can supply you with the megasquirt system if you haven't already got it.

Post Mon Mar 30, 2009 10:17 pm

Ive got all the loom pin info for the m42 loom aswell so i'am sure they could sort something for you, or DIY it

Post Mon Mar 30, 2009 10:21 pm

Info I'd be happy to recieve

My soldering skills, um, suck

Post Mon Mar 30, 2009 10:39 pm

Ill dig it out, been meaning to post it for abit actualy just not got round to it, its all german so i had to guess some of them but they were right

Post Tue Mar 31, 2009 9:24 am

appletree wrote:Inlet vacume sensor is the same as a MAP (manifold air pressure, or lack of pressure)sensor but no you dont need one.

The TPsensor is fine on the IS mines a standard one and its got loads of definition, i got 300+ sites when i set it up on my emerald.

Interesting. Would I be right in saying that the M20 TPS only detects open/closed? (M20 is my frame of reference)

Post Tue Mar 31, 2009 11:43 am

Cool well i was going to import it over as a kit and build it my self soldering Ect as it works out to about £190 delivered from the US i know they want like £400 for them over here

. so will have a go at that i think..

Nice one cheers bud. One of the companys that import the MS systems is less than 3 miles from my house so I might go and have a chat with them about it.

@Pharaoh: I can supply you with the megasquirt system if you haven't already got it.

Post Tue Mar 31, 2009 8:03 pm

Post Tue Mar 31, 2009 9:36 pm

I thought the m20 ones were open or closed to but i may be wrong

Post Wed Apr 15, 2009 9:25 pm

This is an interesting prospect for an interim solution, gets programmable maps, and can run turbo on standard ECU, may not quite have the resolution or detail of a standalone but looks like it will get very close to 95% of what most people require...

http://www.millerperformancecars.com/war-chip.html