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Jeep Street and Performance Do you like to go fast in your Jeep?

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  #1  
Old November 26th, 2019, 09:31
WestfieldMX5 WestfieldMX5 is offline
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Need some Megasquirt opinions

I have a MS3 from a previous car that I'm no longer using, so I thought about using it on the Jeep. It's a 4.0 YJ, but not a lot of interest on the wrangler forums so I'm asking here.

Because the ecu is mounted under the hood, it has to be watertight and that's my main problem. I ditched the megasquirt case and bought a universal watertight case from Mouser. Of course the V3 board doesn't fit inside the case so I designed a new board to carry the MS3 processor.

I have 2 options and I'm not sure which way to go, so I'd like some opinions on which way to go.

First option: I desoldered the connector from a spare Jeep pcm that I had. My case is chosen so that the connector fits nicely inside. The mounting points even match those of the case. I'd cut the lid and have the connector stick through it. This way I'd have a 100% plug and play megasquirt. Problem is that I'd have to silicone the connector to the lid and hope that it's watertight. It would be a nice package but not so easy to waterproof or do modifications.



Second option: I purchased a bunch of waterproof ampseal connectors (with gold pins for the best connection). I could install 2 of them in the lid and it would be 100% watertight. Downside, I'd have to make a boomslang harness from the Jeep wiring loom to the ampseal connectors on the case. Not so professional and prone to damage because it would be dangling under the hood.



Thoughts?
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  #2  
Old November 26th, 2019, 09:40
WestfieldMX5 WestfieldMX5 is offline
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Re: Need some Megasquirt opinions



With the real pcb (first picture is a printout on paper).
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  #3  
Old November 27th, 2019, 21:45
Veeb0rg Veeb0rg is offline
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Re: Need some Megasquirt opinions

what year jeep are you working with?
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  #4  
Old November 28th, 2019, 05:55
RCP Phx RCP Phx is online now
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Re: Need some Megasquirt opinions

It's got to be 91-95 if it has fuel injection from the factory. That would make it the first series of OBD I.
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Old November 29th, 2019, 16:36
WestfieldMX5 WestfieldMX5 is offline
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Re: Need some Megasquirt opinions

Correct, it's a 91. Once it's up and running I plan to convert to logical coils by replacing the distributor with the oil pump drive / cam synchronizer from a later model XJ / TJ.
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  #6  
Old December 9th, 2019, 10:02
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Re: Need some Megasquirt opinions

Quote:
Originally Posted by RCP Phx View Post
It's got to be 91-95 if it has fuel injection from the factory. That would make it the first series of OBD I.
So??? Renix isn't fuel injected???
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  #7  
Old December 9th, 2019, 10:02
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Re: Need some Megasquirt opinions

I might be interested in a pcb.
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  #8  
Old December 9th, 2019, 10:32
RCP Phx RCP Phx is online now
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Re: Need some Megasquirt opinions

Quote:
Originally Posted by old_man View Post
So??? Renix isn't fuel injected???
The OP is talikng about a YJ.
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  #9  
Old December 9th, 2019, 14:01
Jim Malcolm Jim Malcolm is offline
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Re: Need some Megasquirt opinions

Amp connector!! You can't bend the laws of nature. Corrosion never rests. The poison they throw on the roads just keeps getting worse. I will ALWAYS lean towards sealed over convenience. I personally do not consider sealant a sealed solution but I'm picky about stuff I do for myself. The jumper harness would also allow you to relocate it to somewhere other than under the hood, inside the cab like a Renix XJ for example.
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  #10  
Old December 16th, 2019, 09:09
WestfieldMX5 WestfieldMX5 is offline
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Re: Need some Megasquirt opinions

I thought about moving it inside the cab, but I doubt there is an opening large enough in the firewall. At the moment, I'm leaning towards the amp seal though.

Made a bit of progress btw.





[IMG]ttps://3.bp.blogspot.com/-1X-YeDXSC34/Xfe6OgxaC-I/AAAAAAAA79Q/M5yKCGALpQA613gF6cj_Xh22sTxpHY1nQCKgBGAsYHg/s800/IMG_0087.JPG[/IMG]
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  #11  
Old December 16th, 2019, 09:10
WestfieldMX5 WestfieldMX5 is offline
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Re: Need some Megasquirt opinions

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  #12  
Old December 16th, 2019, 10:25
WestfieldMX5 WestfieldMX5 is offline
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Re: Need some Megasquirt opinions

apologies for the large picture, I can't seem to edit my posts.
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  #13  
Old December 16th, 2019, 17:17
RCP Phx RCP Phx is online now
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Re: Need some Megasquirt opinions

Were you able to find a 60 pin connector?
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  #14  
Old December 17th, 2019, 01:30
WestfieldMX5 WestfieldMX5 is offline
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Re: Need some Megasquirt opinions

No, the one I have is from a defective pcm that I bought.
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  #15  
Old December 18th, 2019, 05:51
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Re: Need some Megasquirt opinions

I'm interested in building one for the Renix. The trick would be to make the old PCM plug in along with the vehicle harness. Then you would be electronically able to switch between them on your command.
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