Mercedes SL600 12cyl running on MS3

[Tinkers Toy]

Finally have my car running smoothly on Megasquirt . Time to work on my tune and advanced idle settings. Here is my build information.
MS3, MS3X, 4 channel driver board.
two GM cable driven throttle bodies using one of the integral idle stepper valves and blocking off the other and using one of the throttle position sensors and removing the other. A solid connecting rod ties the two throttle bodies together.
GM coolant temp sensor
GM air temp sensor
36-1 crank wheel and hall sensor
Innovate LC1 wideband O2 sensor

Right now the car is running semi-sequential fuel only on Megasquirt and the ignition and knock is still handled by the Mercedes ECU's

Phase two is to add coil near plug ignition by adding GM LS1 coils and a 36-1 trigger wheel in place of one of the distributor's on the front of the cams. At that time I'll go fully sequential fuel as well.

[vagman]

Pics or never happened!

[Brian]

Agreed, no pics, it's just in your imagination.

So, is it one of the older early 90's to 2001 or so SL or the almost current 03-12?

[Tinkers Toy]

It's a 1994 SL600 in great shape except for the beat up front air dam typical for these years as it sits so low. That will be an easy fix since I used to do high end paint jobs in my youth. I'm attaching a photo of my car if I can get it to work. I don't take a lot of pictures but I will try to show off my conversion work under the hood in the next few weeks.

1994 SL600.jpg

sorry for the oversized photo, like I said I'm not very media savvy.

[Tinkers Toy]

Pics or never happened!

here we go. Very very tight engine bay. MS is only temp wired for proof of concept. All wiring will be tidied up and the ECU moved to the glove box in the floor behind the passenger seat. The entire engine gets covered up with decorative panels. I'll submit final pictures when it's all buttoned up.

MB Engine Bay, MS temp wired for proof of concept and wiring, time to move MS ECU to the rear glove box behind the passenger seat..jpg

GM TB showingTPS & IAC Stepper on leftside of engine.jpg

[Tinkers Toy]

more pics

left side GM TB, adapter, throttle cables, solid TB connecting rod, all buttoned up.jpg

Adapter plate Mercedes to GM TB and trans kickdown mount right side of engine.jpg

Adapter plate mountedwith countersunk allen head bolts and countersunk studs from the backside.jpg

[Tinkers Toy]

you asked! more pics.

right side GM TB, adapter, Trans Kickdown all buttoned up.jpg

Right side TB with air ducting and Mercedes MAF sensor no longer in use.jpg

Megasquirt temp wired in and running, old Merc TB's sitting on fenders..jpg

[Tinkers Toy]

I'll see you all this summer enjoying top down motoring!

1994 Mercedes SL600 left front.jpg

1994Mercedes SL600 left rear.jpg

[vagman]

Oh! How I like that car/model!
Thanks for the pictures. Just..... don't install the trigger wheel on the camshaft. That's not so correct for for engine control. I'm wondering how you gonna have seq. fuel control for 12cyl when MS Pro has 8 inj drivers?
Regards!

[racingmini_mtl]

Oh! How I like that car/model!
Thanks for the pictures. Just..... don't install the trigger wheel on the camshaft. That's not so correct for for engine control. I'm wondering how you gonna have seq. fuel control for 12cyl when MS Pro has 8 inj drivers?
Regards!

He's not using the MS3-Pro but the MS3/MS3X plus another board to provide the 4 additional injector and ignition channels.

Jean

[Matt Cramer]

Correct - and the MS3-Pro can use some of its high current output channels for additional injectors, giving it a total of 12 sequential fuel outputs.

[Tinkers Toy]

Jean is correct, I'm using MS3, MS3X and Jean's 4 channel driver board. I have a 36-1 trigger wheel on the front of my crankshaft. I'm changing my mind about a 36-1 cam trigger thinking I'll go for a 50/50 homemade wheel with a hall sensor when that time comes. I wish I could figure out how to piggy back off the Mercedes cam sensor, I have not checked personally but I read that it uses a VR sensor on the cam with two magnets 120 degrees apart. I consider that 3-1 configuration and I'm told it is not supported in MS. If anybody has thoughts I'm open to suggestions. If not I'll just make the cam trigger wheel when I abandon the Mercedes ignition system and let MS control spark, that will be phase two. Right now I'm just getting excited to start driving my car around again.

Matt & Jean, thanks for your support and help.

[Tinkers Toy]

I just added 12 each LS2 D585 coils, the ones with the heat sinks, and eliminated all the Mercedes ignition. Working great now on semi-sequential fuel and wasted spark. next phase would be to add a cam sensor and go full sequential. Not really needed but maybe someday I'll do it when I get bored.

[Laminar]

Pictures!!

[R100RT]

I just added 12 each LS2 D585 coils, the ones with the heat sinks, and eliminated all the Mercedes ignition. Working great now on semi-sequential fuel and wasted spark. next phase would be to add a cam sensor and go full sequential. Not really needed but maybe someday I'll do it when I get bored.

I cant see the photos but perhaps an effect of them having been posted a while ago?
As well, surely you need to have a turbo on this
Lorne

[Tinkers Toy]

funny you should ask, I have been looking at turbos but there is absolutely no room in the engine bay for anything. I had trouble finding room for the 12 coils. I would have to mount the turbos in the rear of the car under the trunk and plumb the intake side forward back to the throttle bodies. it's possible but I'm so satisfied with how it is running so I think I'm going to drive it and enjoy it. Finally figured out the Catalytic converters were plugged up since the day I bought it. I removed the cats today and this thing finally runs as it should. If I do anything it will be sequential fuel and spark. I am totally satisfied with MegaSquirt and the support
I've been given.

1994 Mercedes on Mega Squirt LS2 coils.jpg

1994 Mercedes on Mega Squirt LS2 coils, V12, lots of wires.jpg

1994 Mercedes SL600 on Megasquirt.jpg

[R100RT]

Wow, there isn't a lot of free room there for sure.
Beautiful, sure would love to hear it

[Laminar]

Very cool. I'd love an SL someday.

[Tinkers Toy]

I really do not have a lot of time invested in my tune, you would think I could find someone to drive my car around while I work on it. I just do it glancing at my laptop and pulling over to tweak it a little. I took a long road trip this past weekend and I was averaging 17.2 MPG at 80 - 85 MPH. I'm quite happy with that for now. I figure that's not too bad for a 4600 pound car with a 6 liter V12. I'm sure if I work at it I can squeeze out a little more on the performance and economy side of things. So far I'm very pleased with my Megasquirted Mercedes V12.

[WestfieldMX5]

congrats! nice looking car!