Megasquirt: What is it and why do I want it? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 11-23-2011, 09:41 AM Thread Starter
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Question Megasquirt: What is it and why do I want it?

I've heard it talked about but really don't know much about it. My car is a 1970 280S Automatic and stock. I believe it currently has Zeniths(I have yet to take delivery of the car) Help me understand all about it.
dws


1973 Mercedes 450SLC (PineGreen/MahoganyLeather)
1981 Mercedes 380SL FORSALE (LtIvory/PalominoMBTex)
1984 Mercedes 500SEC Euro (040Black/BlackLeather)
1992 Mercedes 300SL-24 Signal Red/Black Leather
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post #2 of 7 (permalink) Old 11-23-2011, 12:09 PM
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Megasquirt is an electronic fuel injection system, a stand alone system that manages the fueling in your car. D-jet and K-jet aren't the easiest things to work on, as they're mechanical injection systems, whereas newer vehicles have electronic fuel injectors per cylinder, making it much easier to program controls, if you're into electronics and programming. (and here i'd use something like PerfectPower.com units over a megasquirt system)

My understanding of the d-jet/k-jet systems is pretty limited tho. Perhaps someone else can fill you in more accurately as to how the megasquirt interfaces with the system.

'04 ML500 - Work Horse
'02 SLK32 AMG - Weekend Toy
'74 W114 280 - Project Car
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post #3 of 7 (permalink) Old 11-23-2011, 03:18 PM
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If you are converting a carbed car (sounds like yours is) you will need a FI intake manifold with a throttle body or some means of mounting the fuel injectors at the intake valve. not sure how it works out on the 6 cyl but it is straight forward on the V8's because they all had fuel injection.

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post #4 of 7 (permalink) Old 11-23-2011, 11:53 PM
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just visiting from the 210 forum
here is megasquirt on my 450sl Djet
Converting a 1974 450sl to Megasquirt
and my 450sl CIS
Converting a 1976 CIS mercedes 450sl to Megasquirt
easiest thing with a carbed straight 6 is to get 2 spare carbs, gut them and install throttle body injectors inside the carb throats - works a treat, and gives you a lot of flexibility in tuning the car and the advantages of modern fuel injection reliability
keep well
Barri

2001 e320 wagon, 1973 350sl euro, 1974 450sl, 1976 450sl, 1978 450 slc euro
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post #5 of 7 (permalink) Old 11-24-2011, 12:44 AM
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There are a lot of EFI systems out there. Megasquirt (MS) is one of the cheapest, and is close to be being the most configurable.

Ok. Now three options on how to do it.

1. Modify an old mechanical fuel injection system to take modern EFI injectors and add all the sensors.
2. Get a close K or Djet and modify it. Close to the easiest to do.
3. Get a single carb manifold, and adapt a TBI to it and use MS. The TBI has most of the sensors built in. You can get a Pontiac/Chevy/GM TBI from the iron duke 4 cylinder and it almost everything in one unit. If you do a search on the threads here, I am in the midst of doing this with my 1966 200.

The greatest advantage (other than price) to the MS system is it's flexibility. The biggest downside to the MS is the flexibility. Makes it harder for people not familiar with EFI to get it working. Take for example the SDS efi. They sell you the ECM with harness, injectors and sensors as a complete kit. It also comes with a tune close enough to use. And adjusting it is fairly simple. But, it cannot control a TBI like a MS can.


The Porsche 914-6 in my signature is Megasquirt. It use the old CIS system that has been modified to accept modern EFI injectors. I then mounted all the sensors, and tune the MS to work. Works well. If you do a search on youtube, you can find a video of it running with some install details.

Well, there is a lot more, but this would be a good place to stop.

Hope that helps.

-- brett

Last edited by bfrymire; 11-24-2011 at 12:47 PM.
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post #6 of 7 (permalink) Old 11-24-2011, 12:52 PM
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I am going to some more to this, to answer the second part of the question, which is why to install MS.

1. Tunability. You can adjust any part of the running of the engine. Idle, cold start, full throttle, etc.
2. Lower maintenance. Once its set, nothing to do, unless a sensor dies.
3. Better all round driveability.
4. Better gas mileage (depending on tune!)
5. You can use the laptop to troubleshoot how the engine is running. Using the sensors.
6. MUCH easier to start.

There are probably more, but those are the ones that come to mind.

-- brett
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post #7 of 7 (permalink) Old 11-25-2011, 10:24 AM Thread Starter
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Thank you all, I am now educated enough to know that I will have the Zeniths rebuilt. The MS sounds like a great system, but my car is not a daily driver, so I'll stick with the stock set up for now. Thanks again to all who replied.
dws


1973 Mercedes 450SLC (PineGreen/MahoganyLeather)
1981 Mercedes 380SL FORSALE (LtIvory/PalominoMBTex)
1984 Mercedes 500SEC Euro (040Black/BlackLeather)
1992 Mercedes 300SL-24 Signal Red/Black Leather
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