Modern EFI in the old Benz - Mercedes-Benz Forum
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post #1 of 36 (permalink) Old 06-05-2016, 03:17 PM Thread Starter
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Vehicle: 1972 280SEL daily driver. 904 Dark Blue with cognac interior. euro 4.5 engine
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Modern EFI in the old Benz

Let me start by saying I think the D-JET system is great and was ahead of its time......but mine is 44 years old and has about 450k miles on it. I was struggling with very inconsistent running.....great when cold outside, poor when hot outside...horrible when it rained...but never the same two days in a row.

I decided to take the plunge and do a megasquirt conversion. I completed it this weekend (except for tuning) and am glad to say, it runs better with the default tune in it than it did on D-JET.

I decided to do the whole thing...I went with the Megasquirt MS3X DIY kit, installed a 36-1 wheel on the crank pulley, went with Chevy LS2 coils in wasted spark mode, used EV-6 19.3# injectors running semi-sequential, installed billet fuel rail from Ross, TPS from Bosch, and an IAC valve from an older jeep. Car started on the first try and idled like a champ.

Not cheap. I think when it is all done I will have spent about $1,243.03 to do the conversion, but it was my christmas/birthday present to myself. Probably way cheaper than sorting out my DJET.

If anyone is interested in more details, let me know.
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post #2 of 36 (permalink) Old 06-05-2016, 04:23 PM Thread Starter
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A few photos of the install
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mookschank, wroding and 72W108 like this.
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post #3 of 36 (permalink) Old 06-05-2016, 05:31 PM
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My M115 build.

GM 2.5L TBI, MSII-E, 36-1 trigger wheel, IGN-4 coil from DIYAutotune wasted spark mode, standard GM temp sensors.

Initial install, all the wiring has been cleaned up and properly re-routed.

Modern EFI in the old Benz-p1010014.jpg

Modern EFI in the old Benz-p1010016.jpg

Modern EFI in the old Benz-p1010018.jpg

Made the wires up before I finish mounted the coil. Not happy with the way they came out so I'm going to make a new set and get a cleaner, stock look

Last edited by Mike D; 06-05-2016 at 05:37 PM.
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post #4 of 36 (permalink) Old 06-05-2016, 07:26 PM
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Has anyone done this on an M180 engine?

Currently: 1965 300SE Lang, 1972 Alfa GTV, 1959 Borgward Isabelle Coupé
Past: 1965 250 SL, 1963 220 Sb, 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #5 of 36 (permalink) Old 06-05-2016, 07:57 PM
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Scoot, I started engineering one for the M130 (same manifold I believe). I got stuck trying to match TBI's to supply both sides equally. Matching air flow characteristics to the torque requirements of the M130/M180 put a real crimp in the project. The closest I came was some single BBL TBI'S from an early Toyota.

Tried to source a manifold for the original injected system and went into cardiac arrest at the prices people were asking.

The guy bought 2 new Zeniths and the project got dropped.

A custom manifold would be the easiest and best solution.
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post #6 of 36 (permalink) Old 06-06-2016, 08:35 AM
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Originally Posted by TZ_280SEL View Post
Not cheap. I think when it is all done I will have spent about $1,243.03 to do the conversion, but it was my christmas/birthday present to myself. Probably way cheaper than sorting out my DJET.
Well done, you could probably sell your D-Jet suff and make most of that money back. I suspect that you're going to get much better fuel mileage with this setup.

With best regards

Al

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post #7 of 36 (permalink) Old 06-06-2016, 02:13 PM
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Fuel mileage alone would be an interesting reason to keep up with this thread. Keep the updates coming!
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post #8 of 36 (permalink) Old 06-08-2016, 07:38 AM Thread Starter
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Quick update. I finally got to spend about 10 minutes last night doing some basic tuning. The car now idles at a rock solid 900 RPM with an AFR of 15.0 (I'm using an Innovate wide band sensor). Was able to do some quick tuning at the higher loads/RPM and took the car out. It definitely has a very throaty note now when you accelerate and feels much stronger. Also smells better when idling.

I must say that incorporating the Jeep 4.0 IAC valve was the best decision I made. I was able to build a small air box under it so I bring air from the throttle body to the idle valve and I return it to the engine using stock lines to the intake. I was also able to incorporate the crankcase vent to the air box so it works just like stock. The stepper motor allows you to dial in the idle EXACTLY where you want it.

On another note, I also pulled the entire dash to replace the non functioning heater blower. When I put it all back together, I took some time to seal the air ducts for the A/C system as they appeared to have some leaks. Well, it now blows as much on low as it used to blow on the highest blower setting. On high, it will actually blow your hair. I should have done this years ago.

I hope to get it tuned up over the next few weeks and then check mileage. I used to get about 14 in town and 17 on HWY.
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post #9 of 36 (permalink) Old 06-08-2016, 07:59 AM
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I'm interested in whether you see any mileage improvement using the ignition control. I MSII'ed my M117 (fuel only) and didn't really see much, if any, increase in MPG's. Power and drive-ability yes, mileage no.

Not really a good comparison on mine because the K-jet system I had was pretty trashed.
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post #10 of 36 (permalink) Old 06-10-2016, 12:14 PM
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I just bought a W109 3.5 that I would really like to try this on. I'd be interested in seeing running results. Is this the same car with the Euro 4.5 engine?

With best regards

Al

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