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PostPosted: Mon Nov 05, 2018 12:49 pm 
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Location: NOR, Perth, W.A.
The engine is also back in and I have confirmed that the change I recently made to the radiator tilt position provided a big improvement in clearance between the radiator hose and thermofan. Even with this change, I still would have needed to trim the thermofan cage (as seen in below photo) but the radiator hose no longer fouls on the cage.
Image

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I blame my dad for my love of minis. I think I was conceived in the back seat of one :D
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.


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PostPosted: Mon Nov 05, 2018 2:32 pm 
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Location: Wodonga - Vic/NSW border
Mearcat wrote:
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I lastly made a short length of the ground cable to the body.
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Really nice work and very creative problem solving, but you might have created yourself an earth loop there - it can screw around with electronics - the kind of problems that just don't make any sense... like temperature gauges reading wrong at certain RPM, coils firing at the wrong time, squealing through speakers

Your battery is earthed in the boot floor, and then again at the front subframe and again to the body so there are 2 earth paths from the battery to your subframe. I think you should isolate it in the boot the same way as the 12V

I assume you plan to use the subframe earth point as your "primary" earth point and go off to everything in a "star" layout from there, in which case, good plan ;)

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PostPosted: Mon Nov 05, 2018 5:48 pm 
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simon k wrote:
Really nice work and very creative problem solving, but you might have created yourself an earth loop there - it can screw around with electronics
...
Your battery is earthed in the boot floor, and then again at the front subframe and again to the body so there are 2 earth paths from the battery to your subframe...

Thanks! You are dead right about the ground loop and I forgot to consider it as a potential issue (even though I've encountered it before in circuit board designs :oops: ). I've had a talk to an auto electrician and he has confirmed that ground loops can definitely introduce unwanted electrical noise and/or sensor voltage errors, and that connecting the negative battery post to the body shell is the safest and best common-ground point for sensitive electronics. In light of this, I will remove the entire ground battery cable and the battery will retain the standard configuration where the negative battery post connects to the boot floor via a short cable.

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-Alan
I blame my dad for my love of minis. I think I was conceived in the back seat of one :D
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.


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 Post subject: Re:
PostPosted: Wed Nov 07, 2018 11:42 am 
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Location: Wodonga - Vic/NSW border
Mearcat wrote:
In light of this, I will remove the entire ground battery cable and the battery will retain the standard configuration where the negative battery post connects to the boot floor via a short cable.


I wouldn't remove it, I'd keep it the way you've done it and insulate it away from the boot floor.

I doubt you'll get any serious voltage drop through the long cable, but it does eliminate the voltage drop we get through 50-60 year old spot welds... and you'll have a really clean earth source for your ECU

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PostPosted: Wed Nov 07, 2018 7:48 pm 
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I hope its labelled REAL clear in the boot which cable is which! :)


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PostPosted: Thu Nov 08, 2018 10:45 am 
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Harley wrote:
I hope its labelled REAL clear in the boot which cable is which! :)

As per the other cables I've made, I was going to have red/black heat shrink to aid in identifying the cables. Good point though - I might even use red sheath for the 12V cable within the boot.

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-Alan
I blame my dad for my love of minis. I think I was conceived in the back seat of one :D
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.


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PostPosted: Sun Nov 11, 2018 10:27 pm 
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998cc
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Joined: Tue Nov 13, 2007 4:17 pm
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Location: NOR, Perth, W.A.
After the feedback about ground loops, I've made a second through-panel connector so that the ground cable is not attached to the boot floor.
Image

I've drilled a hole near the factory battery ground point and the negative post of the battery will join to this new connector. I'll extend the ground cable under the car (using a butt connector and some spare cable) and route it around the battery box to fit to the new connector under the boot floor
Image

_________________
-Alan
I blame my dad for my love of minis. I think I was conceived in the back seat of one :D
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.


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