Replacing Bosch jetronic with MegaSquirt EFI - Page 6 - Mercedes-Benz Forum

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post #51 of 124 (permalink) Old 07-17-2007, 06:08 PM
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Originally Posted by mcbear
And if you know anyone who needs any accessory MicroChannel boards, I have about 30 setting in the basement.
Another IBM dog, like Token Ring.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

http://www.megamanual.com/index.html
http://www.bgsoflex.com/megasquirt.html
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post #52 of 124 (permalink) Old 07-17-2007, 09:00 PM
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Hbar & oughtsix:

Thanks so much for the info about the injector diameter. I had no idea that pulsed injectors were available that were the same size as the bosch CIS injectors. I guess I have to do a little research on sizing the pounds/hour and find some likely part numbers.

Hbar.... How did you seal up the axiliary holes in the intake ports for the extra air rails? Making blank-off plates for the outside sounds easy, but what did you do inside the runner?

I don't think I'll be able to easily fabricate a fuel rail because there are several obstructing brackets and pipes that wander through the area. But plumbing a hose to each injector would work fine. I'll take a look at the info on the Megasquirt site.

A major breakthrough for me today was locating another 1986 Lotus Esprit Turbo owner that has already converted to Megasquirt. He says that his car never ever ran as well as it does now after converting to Megasquirt. Hopefully I can get a set of VE tables and timing maps from him since his motor is identical to mine. I hope I like how he did his installation.

I did leave off a few details about my engine, including the fact that it already has a 3 wire (heated) O2 sensor, with the associated black box, additional thermal time switches, throttle position sensor, warm-up regulator with altitude correction gismo, etc, etc, etc. Someone told me that's what the "K" in K-Jetronic stands for.... Lambda closed-loop control added to the basic Jetronic system.

I get dizzy just thinking about it, never mind trying to debug it.

Cheers... Jeff in greater Boston
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post #53 of 124 (permalink) Old 07-18-2007, 10:24 AM
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In my younger days I spent a year heading up a POTPIE project. (Pull Out TokenRing Put In Ethernet)
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post #54 of 124 (permalink) Old 07-18-2007, 10:33 AM
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Originally Posted by LotusJeff
Hbar & oughtsix:

Thanks so much for the info about the injector diameter. I had no idea that pulsed injectors were available that were the same size as the bosch CIS injectors. I guess I have to do a little research on sizing the pounds/hour and find some likely part numbers.

I just want to clarify. On the Mercedes there is a plastic insulator that fits over the pintle of the mechanical injectors that give the injectors a profile very close to an electronic injector. I have a theory that this may be due to a hold over from the D-Jetronic days of the 450 motor. In the early 70' the 450 came with D-Jetronic that used electronic injectors and an analog electronic brain. My theory is Mercedes just slipped the plastic insulator over the mechanical injectors to make them fit in the same bungs as the previous electronic injectors when they switched to K-Jetronic.

In other words your Lotus might not be the same. I haven't seen any electrical injectors that are of a simular profile to the mechanical injectors.

Last edited by oughtsix; 07-18-2007 at 10:36 AM.
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post #55 of 124 (permalink) Old 07-18-2007, 10:11 PM
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Originally Posted by oughtsix
Maybe you shouldn't tackle this project if you have 30 microchannel boards sitting around that you couldn't get working????? Hahaha!
Not a problem with getting them working, I just moved on from MCA servers for most applications and had leftover cards. While most folks did not like them, I found them to be very dependable. I had one Mod 80 server [originally a network server] that was tasked to a weather recording system in 1993 that did not get replaced until 2005. I only replaced the power supply once. Otherwise it ran 24/7 for 12 years.

My problem with megasquirt will be where to mount the Mod 80 towers I have left in the back of the Benz. MS will interface with Token Ring and SCSI 1 won't it?

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Being smart is knowing the difference, in a sticky situation between a well delivered anecdote and a well delivered antidote - bear.

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post #56 of 124 (permalink) Old 07-18-2007, 10:45 PM
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Hmmm... Maybe you could mount the towers on top of the diesel generator you will be trailering around to power them?????? I am happy to see you don't mind a touch of sarcasm.

I worked on a few PS/2's and a couple of them were servers but I really came more from the clone world with Netware and arcnet. I installed a lot more EISA and ISA cards than I ever did MCA. The EISA cards were the real treat especially after a couple of years trying to find the proper EISA config files. I had one large IBM shop that insisted on TokenRing when they replaced their System 36 with one of the first AS/400's. I got really proficient at putting those funky square connectors on shielded twisted pair. I must say that with their couple of dozen MAU's they never had a lick of layer 1 problems.

I don't think you will have any problems picking up how MegaSquirt. You just use MegaTune with its GUI to program MegaSquirt through a serial connection. Are you planning on building you MegaSquirt board or going preassembled? The MegaSquirt is definitely one of the nicest kits I have ever assembled. The only problem I had were some very close pads on a couple of the transistors. I had to pull out a magnifying glass to make sure I didn't have a short. Even with the glass I couldn't really tell until I cleaned off the excess rosin.

MegaSquirt is supposed to interface with CAN network and it does use a DB37. I am sure you could plug it into an old Adapted controller.

Last edited by oughtsix; 07-18-2007 at 10:53 PM.
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post #57 of 124 (permalink) Old 07-19-2007, 07:35 AM
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Quote:
Originally Posted by oughtsix

In other words your Lotus might not be the same. I haven't seen any electrical injectors that are of a simular profile to the mechanical injectors.
oughsix:

I did misunderstand... bummer. But it only means that I need to do a little machining on my intake manifold or find a slightly newer manifold that used a GM pulsed injector system.

On the Benz intake manifold, did you just blank off the auxiliary air rails on the outside. (I think one of you just left the cold start injector in place.) Or did you also fill the holes in each intake runner where these extra rails come out near each injector?

One of these air rails is supposed to improve injection quality at idle, so I didn't know whether it was another mechanical band-aid which could be eliminated, or something that I should leave operational. If I had to make a guess, I'd say that I should remove all the extra air rail stuff completely.

Let me know what you did... Jeff
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post #58 of 124 (permalink) Old 07-19-2007, 11:11 AM
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Jeff,

I reset my server last night and it is back up. This link should give you a good idea of what the mercedes intake looks like. Mercedes has an upper and lower intake. 450slc megasquirt install

The Mercedes has two air ports on the upper intake for (Idle + cold start). The two ports are for the left cylinder bank and the right cylinder bank. A piece of rubber tubing shaped like a "Y" bring these two ports into one airstream. From this one airstream the cold start injector is plumbed first. The idle adjustment screw and the high idle warm up regulator are then plumbed further down line of the cold start valve.

I am currently using this stock air port plumbing with the coldstart injector plumbed in and disconnected. I plan on removing the cold start injector, idle adjustment screw and warmup regulator and replace them with a single IAC valve. I have a GM stepper IAC and a chunk of aluminum to mount it in. This is a bit dificult to fit under the hood in a reasonable manner and I plan on finding an inline IAC valve with hose barb fittings.

It was much easier getting my engine running with the stock idle hardware than it would have been to fabricate the IAC hardware from the start. This stock setup is working very nicely and the only reason I am planning on swapping to an inline IAC is to clean things up under the hood and make them look nicer.

Last edited by oughtsix; 08-02-2007 at 10:45 PM.
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post #59 of 124 (permalink) Old 07-19-2007, 11:19 AM
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Originally Posted by LotusJeff
oughsix:

I did misunderstand... bummer. But it only means that I need to do a little machining on my intake manifold or find a slightly newer manifold that used a GM pulsed injector system.
There are reamers available with profiles for Electric injectors. One of these would make machining a perfect injector bung a much easier job but they are a little pricy.

Last edited by oughtsix; 07-19-2007 at 11:24 AM.
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post #60 of 124 (permalink) Old 07-20-2007, 04:57 PM
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I have been getting an incrediable amount of traffic on my website. It has been just too much for my tired old server and firewall to handle. I decided to pay the $75 for a years worth of godaddy hosting and I am in the process of moving my site over. I will post when my new site is up. My apologizes to anyone that has been trying to view my site.
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