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alaskadan
Samba Member
Joined: January 09, 2013
Posts: 1857
Location: anchor pt. alaska
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 Posted: Sat Mar 30, 2024 2:29 pm Post subject: Small car wiring harness |
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| So I just received a small car wiring harness to install in my syncro. My current POS wiring harness has the ecu in a sealed box in the drivers side battery tray. It's screwed to the top of the tray area and has breather holes in it. It's always stayed clean. Small car says they won't warranty it if installed there due to possible heat issues. OK. It's the weekend so I can't call and ask them if it's possible to install it under the rear bench without gas tank removal. Has anyone managed to do it. |
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vanagondan
Samba Member
Joined: September 09, 2020
Posts: 73
Location: WA
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| Posted: Sun Mar 31, 2024 2:07 am Post subject: Re: Small car wiring harness |
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| Hey, Danny from Small Car here. You can install it without removing the gas tank. Just relocated my harness a few weeks ago after the gas tank was installed. I had just converted to Syncro. You need to drill a pilot hole from the driver side wheel well as far inboard as you can get. |
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Xevin 
Samba Member
Joined: January 08, 2014
Posts: 7623
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| Posted: Sun Mar 31, 2024 5:08 am Post subject: Re: Small car wiring harness |
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Well Dan and Dan I hope you have a chance to enjoy the eclipse. Hope you get it all sorted out Dan.
Link
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alaskadan
Samba Member
Joined: January 09, 2013
Posts: 1857
Location: anchor pt. alaska
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| Posted: Sun Mar 31, 2024 9:17 am Post subject: Re: Small car wiring harness |
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| OK thanks for the reply. |
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MarkWard
Samba Member
Joined: February 09, 2005
Posts: 17110
Location: Retired South Florida
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| Posted: Sun Mar 31, 2024 10:35 am Post subject: Re: Small car wiring harness |
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There should be a good size factory hole left rear firewall under the back seat where the original ECU harness went through. I’m 89% sure the tank does not cover that cutout. With ECUs in general, the shorter the run the better. Time to do a little investigating.
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squeegee_boy
Samba Member
Joined: April 27, 2008
Posts: 762
Location: Langley, BC, Canada
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| Posted: Sun Mar 31, 2024 11:29 am Post subject: Re: Small car wiring harness |
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| MarkWard wrote: |
| There should be a good size factory hole left rear firewall under the back seat where the original ECU harness went through. I’m 89% sure the tank does not cover that cutout. With ECUs in general, the shorter the run the better. Time to do a little investigating. |
The tank definitely does not cover that. It is fairly tight, and might be packed full of dirt though.
Robyn
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1984 FrankenSyncro Westy. EJ25 RMW kit
1971 Super Beetle with an EJ22. Oh yes. Daily driver |
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djkeev
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Joined: September 30, 2007
Posts: 32574
Location: Reading Pennsylvania
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syncrodoka
Samba Member
Joined: December 27, 2005
Posts: 12005
Location: Santa Cruz, CA
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| Posted: Sun Mar 31, 2024 12:08 pm Post subject: Re: Small car wiring harness |
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As stated you can definitely replace the harness with the tank in place. Spray out all of the mud and debris that is packed in the area as the harness will not want to move with decades of stuff packed and dried in place.
There is no benefit to having the ECU in the engine bay, early converters did this as a easier install but it leads to issues down the road. VW mounted theirs under the back seat in later years and subaru mounted it on the firewall, both are in the more stable cabin area. |
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vanagondan
Samba Member
Joined: September 09, 2020
Posts: 73
Location: WA
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| Posted: Sun Mar 31, 2024 12:19 pm Post subject: Re: Small car wiring harness |
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I love seeing posts related to products I’ve had a hand in designing/working with. I try to check for them regularly.
If the van is an early van there won’t be an existing hole. But yea, one can be drilled. We require the ECU to be in the cabin for water and temperature reasons. Same thing goes for the interface board which is connected to the harness at the same point as the ECU. |
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MarkWard
Samba Member
Joined: February 09, 2005
Posts: 17110
Location: Retired South Florida
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| Posted: Sun Mar 31, 2024 1:19 pm Post subject: Re: Small car wiring harness |
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Sorry, somehow I assumed this was a syncro which all should have had digifant 2.1 engines and ECUs. My mistake.
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vanagondan
Samba Member
Joined: September 09, 2020
Posts: 73
Location: WA
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| Posted: Sun Mar 31, 2024 1:40 pm Post subject: Re: Small car wiring harness |
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| MarkWard wrote: |
| Sorry, somehow I assumed this was a syncro which all should have had digifant 2.1 engines and ECUs. My mistake. |
Must be a converted syncro since he’s worried about his gas tank being there and from the sounds of it there isn’t an existing hole. |
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alaskadan
Samba Member
Joined: January 09, 2013
Posts: 1857
Location: anchor pt. alaska
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| Posted: Sun Mar 31, 2024 3:39 pm Post subject: Re: Small car wiring harness |
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| Sorry I should fix my profile, its a factory 87 tintop syncro. Yes its appreciated to have vendor input here. |
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