 Move D-Jet ECU to the trunk ? |
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| Literati914 |
 May 1 2025, 02:38 PM
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Senior Member  Group: Members Posts: 1,929 Joined: 16-November 06 From: Dallas, TX Member No.: 7,222 Region Association: Southwest Region  |
Since my project has it's battery shelf moved to the rear trunk, I'd been planning to create a bracket and suspend the stock ECU from the original ground lug where the neg. battery cable used to attach (I'm using another location for the battery ground now). But to do so, is going to take a custom bracket of some kind, and even then it's a bit awkwardly placed, and I may even need to drill an additional hole for a solidly mounted bracket.
So, I got to thinking - why not just move the ECU to the rear trunk? Well, maybe heat? I've seen many CD boxes in the trunk but then they usually have a heat-sink style case. Then I also have an actual Bosch D-jet ECU from my '71 P1800 that has a heat-sink "edge" section. Hmm.. but then doesn't the engine compartment get much hotter than the trunk would? Also.. don't I recall these ECU's being put in the trunk to make room for air conditioning lines, by some? (I may need room for that too at some point) What say's the group? Thoughts, experiences, opinions ..conjectures? |
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| emerygt350 |
May 1 2025, 03:04 PM
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Advanced Member Group: Members Posts: 2,869 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
QUOTE(Literati914 @ May 1 2025, 02:38 PM)  Since my project has it's battery shelf moved to the rear trunk, I'd been planning to create a bracket and suspend the stock ECU from the original ground lug where the neg. battery cable used to attach (I'm using another location for the battery ground now). But to do so, is going to take a custom bracket of some kind, and even then it's a bit awkwardly placed, and I may even need to drill an additional hole for a solidly mounted bracket. So, I got to thinking - why not just move the ECU to the rear trunk? Well, maybe heat? I've seen many CD boxes in the trunk but then they usually have a heat-sink style case. Then I also have an actual Bosch D-jet ECU from my '71 P1800 that has a heat-sink "edge" section. Hmm.. but then doesn't the engine compartment get much hotter than the trunk would? Also.. don't I recall these ECU's being put in the trunk to make room for air conditioning lines, by some? (I may need room for that too at some point) What say's the group? Thoughts, experiences, opinions ..conjectures? I suspect the trunk gets hotter than the engine compartment. I had a remote sensor in the engine compartment and it rarely reached 100 degrees. I just think there is way too much airflow. The trunk has no airflow and just cooks. |
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| JeffBowlsby |
May 1 2025, 06:36 PM
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#3
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 8,902 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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If it were me I’d consider either finding a really big tight fitting grommet or mounting a two or three piece circular, watertight multi pin connector on the firewall (gaskets or sealed) and splicing the cable, to mount the ECU to the cabin side of the firewall behind the pass seat.
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| JeffBowlsby |
May 1 2025, 06:36 PM
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#4
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 8,902 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Dbl dbl.
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