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Old 10-17-2016, 04:20 PM   #1
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Default Waterproofing Megasquirt?

As winter approaches, I'm getting ready to officially start installing my turbo build parts. I want to start with installing MegaSquirt; I know the OEM ECU is fairly protected by an elevated brace + carpeting and soundproofing, but the MegaSquirt mounts a little differently. I'm concerned about water getting to it; I've already had one A/C hose clog that resulted in water spilling into the passenger footwell.

I'm from Montreal and we get a fair amount of rain as well. Am I being paranoid about wanting to waterproof the MS? If not, what have some of you done to ensure your $1000 ECU stays dry and safe ;p ?
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Old 10-17-2016, 04:27 PM   #2
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Where are you mounting it that you're worried about water? I can't think of a single OEM location that wouldn't involve the car being under 2' of water to actually touch the ecu.
the ms-pro is also waterproof
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Old 10-17-2016, 04:51 PM   #3
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You can use a Singular (or homemade) bracket to mount your MS in the OEM style, slightly elevated from the sheetmetal and protected by the cover and carpet.

Singular Motorsports Miata ECU Bracket for Miata 1990-1993
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Old 10-17-2016, 06:36 PM   #4
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Quote:
Originally Posted by 18psi View Post
Where are you mounting it that you're worried about water? I can't think of a single OEM location that wouldn't involve the car being under 2' of water to actually touch the ecu.
the ms-pro is also waterproof
OEM location, just worried about my AC getting clogged and sprayed out on top of the MS from under the glove box.
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Old 10-17-2016, 07:21 PM   #5
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IIRC, in a 1.6 the ECU is under the passenger-side carpet, I could see it getting damp there in the event of a leak.

To waterproof a non-pro megasquirt you basically need to encase it in a waterproof container and then seal the hole where the wires come in somehow. Theoretically you could do with a gasketed box and a bunch of hot glue around the wires, but it's really not practical. If you really care, you'll have to buy an the pro and put the waterproof connector onto the factory harness.

You're being paranoid. If you were building a Locost/Exocet/Catfish/etc style of kit car, then this might be a real concern when driving the car in the rain. A race car that has compromised waterproofing and needs to be reliable in the rain might also be a concern.

--Ian
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Old 10-17-2016, 10:33 PM   #6
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Quote:
Originally Posted by codrus View Post
IIRC, in a 1.6 the ECU is under the passenger-side carpet, I could see it getting damp there in the event of a leak.

To waterproof a non-pro megasquirt you basically need to encase it in a waterproof container and then seal the hole where the wires come in somehow. Theoretically you could do with a gasketed box and a bunch of hot glue around the wires, but it's really not practical. If you really care, you'll have to buy an the pro and put the waterproof connector onto the factory harness.

You're being paranoid. If you were building a Locost/Exocet/Catfish/etc style of kit car, then this might be a real concern when driving the car in the rain. A race car that has compromised waterproofing and needs to be reliable in the rain might also be a concern.

--Ian
Thanks for the advice Ian. I think I'll put my mind at ease with a very basic plastic covering over the ECU itself, just just just in case. Cheers
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Old 10-17-2016, 11:28 PM   #7
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Ms3-pro is the solution. Plastic cover will get you some of the way. If I ever build an exocet in Oregon it will get an ms3-pro
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Old 10-18-2016, 12:32 PM   #8
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Just put a plastic bag/box over it with the opening pointing down. Unless the footwell somehow fills all the way to the dashboard, this will be enough waterproofing in the event of a clogged AC drain hose or something.
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Old 10-18-2016, 01:01 PM   #9
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Zip-loc. Stop over-engineering things.
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Old 10-18-2016, 01:50 PM   #10
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Quote:
Originally Posted by 18psi View Post
Where are you mounting it that you're worried about water? I can't think of a single OEM location that wouldn't involve the car being under 2' of water to actually touch the ecu.
the ms-pro is also waterproof
my car would leak water directly to the passenger foot-well when it would rain...
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Old 10-18-2016, 02:02 PM   #11
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Quote:
Originally Posted by Braineack View Post
my car would leak water directly to the passenger foot-well when it would rain...
And a bag or something over the ECY would be enough to keep it dry unless the footwell filled up.
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Old 10-18-2016, 05:46 PM   #12
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I don't think I've ever seen a Miata MSPNP sent back for repairs with water damage, and we've been selling them for nine years now. Almost all ECUs I have seen sent back with water issues were either installed in the engine compartment, or the victim of a boating accident.
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Old 10-18-2016, 06:03 PM   #13
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Quote:
Originally Posted by Braineack View Post
my car would leak water directly to the passenger foot-well when it would rain...
your Miata was a heap that had many other issues too, so..........

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Old 10-18-2016, 06:11 PM   #14
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I would consider dipping the whole unit in hot wax to seal it.
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Old 10-24-2016, 05:32 PM   #15
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Flex Seal from a home improvement store. It's how I waterproofed the ECU for my 1990 way back when it would always leak water into the car after a storm.
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Old 10-28-2016, 12:01 AM   #16
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Waterproofing a MS thread and nobody has mentioned duct tape yet?! Blasphemy!
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