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post #21 of 36 (permalink) Old 06-24-2016, 02:41 PM
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Vehicle: '72 350SL, '85 300D, '98 E320, '19 Subaru Outback (sold '14 GLK250)
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Originally Posted by TZ_280SEL View Post
Now that I've driven it with mega squirt for a week, it DEFINITELY has a large improvement over d-jet.
Interesting project. Have followed some others that have done similar thing. I would like to do same, but need a different car to experiment on!

Big advantage you have, is the wideband AFR. Do you have sensors on both sides, or just after mixing?

I installed a, AEM Uego on my 350SL 4.5 - It makes all the difference to be able to set idle and load AFR at will. Currently have idle at about 13.8 and cruise (mid load range) at about 14.5. Djets would run a lot better if more owners & shops had a good way to set mixture. Most are shooting in the dark.

With good key djet parts like MPS, ECU, Trigger pts, distributor plus Pertronix to overcome any distributor wear, it is amazing how well a 44 year old djet runs.

Keep posting - enjoy seeing how you progress.


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1972 350SL 4.5L, E320, 300D, Outback 2.5 - near Kingston, Ontario
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post #22 of 36 (permalink) Old 06-24-2016, 03:29 PM Thread Starter
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Date registered: Feb 2010
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On the 280SELs there is no crossover pipe. Also, the right side has a tri-y so no easy place for a sensor. So I am running single sensor on driver's side bank
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post #23 of 36 (permalink) Old 06-24-2016, 07:29 PM
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On the 280SELs there is no crossover pipe. Also, the right side has a tri-y so no easy place for a sensor. So I am running single sensor on driver's side bank
OK. I have mine on driver side pipe, but it is back of crossover just before first muffler/resonator? Hopefully get some mixing.


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1972 350SL 4.5L, E320, 300D, Outback 2.5 - near Kingston, Ontario
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post #24 of 36 (permalink) Old 06-28-2016, 06:14 PM Thread Starter
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Quick update. 13.7mpg on last tank all in town, so I'm back where I was prior to the conversion. I discovered the lock nut on the fuel pressure regulator I installed had backed off and fuel pressure was up to 50psi from the 43 I had set it at so I was running a bit rich. That does mess up a good bit of my tuning but I'm getting quicker at it. Hope to see better on the next tank but who knows. Can't wait to get her out on the highway.

Good news is that even with 50psi fuel pressure, no fuel leaks. I have so much more confidence in my billet fuel rails with o-ring seals to the injectors instead of clamps. I have eliminated 10 fuel lines under the hood (one to each injector, one to cold start injector, one to the damper) so that is 20 fewer potential leak points from failed clamps. Love it.

I think the next step is to start adjusting the Air-Fuel ratio settings to get everything running a bit closer to stochiometric. My leanest setting right now is 14.7 on high rpm lift throttle while a lot of my table is in the low to mid 12AFR. I should be able to get another MPG or two from it.
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post #25 of 36 (permalink) Old 06-28-2016, 07:10 PM
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Yep, d-jetronic runs super high fuel pressure. If you went with mustang injectors, you might want to go with mustang fuel pressure regulator and fuel pump.

With best regards

Al

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post #26 of 36 (permalink) Old 06-28-2016, 08:08 PM Thread Starter
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The EV-6 injectors want 3 bar differential which is 1bar above D-JET settings I believe. MS wants fuel pressure to be referenced to manifold vacuum so I have a vacuum compensated aftermarket regulator. It runs 43 psi without the engine running but lower at idle due to high vacuum.

The regulator is adjustable. I think I didn't tighten the lock nut enough when I set pressures at startup.
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post #27 of 36 (permalink) Old 04-26-2019, 01:59 PM Thread Starter
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Well, no updates on this thread for almost 3 years but with renewed forum interest in aftermarket EFI, I thought...why not.

To be honest, I haven't touched the tune on this car for about 30 months. It ran too consistent and I didn't' want to mess with it. That coupled with a very short commute to work made tuning unnecessary. However, the commute just got longer so I'll be back to doing some tuning in the coming weeks.

As for problems I've had with my MS install, to date I've had the following issues with the install.......NONE.

I have about 15,000 miles on the install and the MS was a champ all the way up until bambi's mother decided to try to kill me. It's taken over 5 months to get my insurance company (USAA) and my local classic Benz restoration specialist (definitely not words I'd use to describe them) to get my car back to me. Now I've been re-doing all the things they did wrong (new radiator shroud, fan clutch, AC temp switch for the aux fan) and due to their inability to fill the trans correctly, I'm in the middle of a trans swap in the old girl (she had a flair from 1-2 prior to, but now she has a FLAIR>>>>>>>> from 1 to 2, so out with the old and in with the new.

I did a trip to DC a month or so ago and even with some in-town driving on the tank, I got about 18MPG.

I have a new, more aggressive, ignition map I'm going to try after I get the trans figured out tomorrow. While she runs great, I'm bringing spark advance in way too late so she is a bit of a dog from 10-35 mph.

Anyone looking for reliability in an old D-Jet system that is on its last leg (as mine was), if you do it right, the MS really is a good system.

And to all the purists out there, I get it and respect it. My car was never going to be restored to perfection, so I chose to make her drive-able but still a classic looking W108.
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post #28 of 36 (permalink) Old 04-26-2019, 04:42 PM
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You and your car are off the hook. You must have about 500k miles by now. Glad you brought it to the Classics on the Green a few years ago.
Will
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post #29 of 36 (permalink) Old 04-27-2019, 07:28 AM
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If you're getting 18MPG, you're doing great. I would to struggle to get 14MPG out of any of my 4.5's.

With best regards

Al

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post #30 of 36 (permalink) Old 04-30-2019, 08:35 AM
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Would you be able to share this spreadsheet listing the parts necessary? I have a '72 4.5L as well and the D-jet system is beginning to act up (it sat for 15yrs prior to me getting it) so I was looking at a MS conversion but unsure what all would be required.

Very cool post/thread, have been looking around for someone else who had done this!
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