Brown Benz (M104-Megasquirt)

[carmaniac37]

Update:

Cam input is working along with the variable intake camshaft. Currently set to advance the cam from about 75% to 100% throttle between 3000 and 5200 RPM. MS3 allows you to choose the independent variables which determine the position of the VVT. For example it could be based off of direct TPS readings or the MAP sensor reading. I haven't wired up the resonating intake flap yet which I'm very much looking forward to but it will be configured in a similar manner. I'll have to get it on a dyno come springtime.

I'm struggling with a sync loss error at the moment which keeps the engine from revving over 5600. It's like the blue ballz of the car world. Just so close to finishing. And its right where the power comes in strong.

Also, I still don't have a working tach. I'm trying to wire a relay coil off of the MS3X tach output as our tachs draw from the coil - and the MS3 only puts out a 12v signal.

Much sideways in the rain, gonna need an LSD for sure... gotta start saving up again to fund that. I was able to wire up the temperature guage. There's a separate sensor for that on the M104 thermostat so I spliced in the M103 factory wire for the guage to that sensor. Only guage not working is the tach.

[carmaniac37]

Fixed the rev limit. VR sensor was backwards. Switch the wires and we're good. Also now running fully sequential injection and working on getting the resonating intake flap operational. It will be operated the same as a VVT, I just need to pick an output for it. I'm also trying to figure out when it engages and disengages. I've read a number of different opinions. Any ideas there?

[202brabus]

What did you use for idle air control

[carmaniac37]

Intake flap is functional. Much like the VVT, 12v is supplied through the harness via a path on my auxiliary switched fuse box. The megasquirt grounds the ECU side which is how the factory computer does it so the wires line up. I have the VVT running through the actual VVT setup page in TunerStudio MS and the flap is a programmable On/Off output using the 'fidle' pin on the MS3 main DB37 connector. It currently engages at 3800 RPM, I am continuing to lower it until there is no noticeable effect at the engagement point. At the moment, it feels like Vtec. It makes an unbelievable difference which required retuning the fuel map for the top end. I was seriously surprised by how big of a role the physics behind that manifold play.

I currently have no provision for idle besides fine tuning the base maps as best as possible on a fully sequential fuel setup. Lowest I can get it to idle at consistently, irrespective of outside air temps and coolant temps, is 950. On hot days it drops to almost 800. Cold days it's over 1000. My IAT sensor needs to be properly calibrated. One does that by measuring the resistance across the sensor at three different temperatures and inputting those values. The Megasquirt can interpolate from there. The problem is having three controlled and accurate temperature zones to read the resistance at. I was thinking of using ambient air, the freezer, and the oven.

I'm not sure what the best Idle valve would be but a good location is in place of the EGR on the throttle body plate of the aluminum lower intake manifold. I may delete that lower manifold as suggested for better torque and to relocate the filter and inlet to the cold side away from the exhaust so I'll have to come up with something else.

[202brabus]

I actually got a hold of the diagram for the throttle body. Looks like its a stepper motor, ms can be configured to control a stepper motor. I might not use this throttle body if it becomes to much of a hassle. I still have my 97 throttle body which also has a motor/tps but might be pwm which would he much easier to set up.

[202brabus]

Youre idle is hight due to the resting point of the throttle plate. One way is idle air control. The other way is throttle. If you look at the throttle plate you can push it either way. Im guessing it has to be pwm. Im looking into having ms control that motor for idle. Now I have to also find out if the pwm controller in ms can support the amperage that will be needed to drive the elec pwm motor. Im no elec guru so correct me if im wrong.

[carmaniac37]

Correct, I'm basically idling at a partial throttle which is no good. Shoot me over those wiring diagrams if you could. I figured there'd be a way to get the factory style idle working just wasn't sure how exactly. I should think a standard MS stepper setup will do it and should be able to provide enough power. I chose the non-ASR throttle because it has no limp mode. If you use an ASR throttle then the cable will only open it half way. To get it to open fully, you have to power up the throttle correctly to engage a clutch or something along those lines. That's used by Mercedes for limp mode if there's and engine fault and for the ASR traction control to limit the throttle if the wheels are spinning. Non-ASR uses the stepper motor to control only the stop for the closed position so the cable lifts the throttle off the stop no matter what. At idle though it can fine tune the throttle for smooth functioning. I really would like to get that working.

This is a pretty good video comparing the two.

https://www.youtube.com/watch?v=oluUNq4Yznc

[202brabus]

I understand how the asr throttle works. Theres a magnetic clutch on the non asr unit as well.

[202brabus]

Ill post up the schematics in my thread, no thread jack intended

[carmaniac37]

Been doing some exhaust work. Deleting cats and fixing a leak. I had to get a video of it with open headers just for kicks. If you've ever wondered, here it is.

[202brabus]

Sounds like a 16v DESTROYER. Pesky 16v wont know what hit them.

[fact150]

Sounds like a real car

[fact150]

I was thinking more this for me . Straight 6 makes it easy .

[secretmachine]

isn't that why we're all building one? :) it's the car that should have been made. I'm curious how the 980's will compare to the 99's.

Sounds like a 16v DESTROYER. Pesky 16v wont know what hit them.

[202brabus]

Did you use the factory 2.6 exhaust?

[carmaniac37]

I wish there were any 16 valves around me to be surprised. I've still never seen one in the flesh.

Yes, factory exhaust bolted right up, it was pretty quite before it started leaking after the cat.

[202brabus]

I wish there were any 16 valves around me to be surprised. I've still never seen one in the flesh.

Yes, factory exhaust bolted right up, it was pretty quite before it started leaking after the cat.

I got a downpipe off a 2.6 190e and fitted it to the m104 and it did not fit. Do you have any pics of you m104 motor showing the exhaust manifolds?

[fact150]

I got a downpipe off a 2.6 190e and fitted it to the m104 and it did not fit. Do you have any pics of you m104 motor showing the exhaust manifolds?

My w210 but its dark outside .

[SpartanV]

Sounds fucking awesome lol

[202brabus]

My w210 but its dark outside .

I need his pics to see if my exhaust manifolds on my 97 motor are the same as his 95 motor.