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nocoolname
(@nocoolname)
Estimable Member

Ground loops can be a PITA.  It's basically if you ground the battery to chassis, but then also ground a sensor/relay/stereo/whatever and then that sensor/relay/whatever is also grounded to the chassis.  It'll create a voltage differential which in the case of a sensor, offsets the reading by the voltage differential.  Most aftermarket stand alones have a ground wire directly from the battery, then the sensors ground through the ECU. 

 

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Posted : May 15, 2020 12:35 am
dev liked
dev
 dev
(@dev)
Just a member. Moderator
Posted by: @nocoolname

Ground loops can be a PITA.  It's basically if you ground the battery to chassis, but then also ground a sensor/relay/stereo/whatever and then that sensor/relay/whatever is also grounded to the chassis.  It'll create a voltage differential which in the case of a sensor, offsets the reading by the voltage differential.  Most aftermarket stand alones have a ground wire directly from the battery, then the sensors ground through the ECU. 

 

 The chassis is not a good ground for a lot of sensitive electronics. For car audio the problem is the voltage potentials from the RCAs that crates ground loops from the receiver and the amps where it picks up noise. The solution is to ether share a common grounding point or run separate small grounding wire bridging the two and it works in just about every install I have done.  The sad thing is they sell all kinds of devices or special cables to suppress the noise when the solution is simple.  

What is also funny were those grounding kits that give you more power when what they actually do is fix your corroded chassis grounds and restore power.  Then it became a thing for being a dress up kit for the engine bay. 

 

  

 

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Posted : May 15, 2020 8:43 am
marsrock7, nocoolname, LordTakuban and 1 people liked
neomr2
(@neomr2)
Reputable Member

You really should strive for a single point ground system.  

The battery acts as a very good noise filter for the alternator when the engine is running, so a solid battery (-) terminal connection to the engine block is most important. 

Then a solid independent connection from the battery (-) terminal to the body/chassis - the power distribution system for the car has multiple ground connections that are very important to limit noise.

Since any noise signal consists of many high frequency harmonics, braided ground strap is also preferred to solid or minimal stranded wire.

Grounds also return current back to the battery so the wire strap must also be sized to handle the required amperage as well.

Poor grounds induce noise into undesired circuits and create varying voltage potentials at differing nodes which can/will create issues with both analog and digital circuits.

Just some things to think about when taking wiring shortcuts.

Mono Craft GT-300 with a few upgrades...

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Posted : May 15, 2020 9:17 am
WilcoMR-S, nocoolname, Patrick Lipp and 1 people liked
Patrick Lipp
(@pattielipp)
Guy with car Admin

New parts coming in soon.

C-One style side vents and front/rear Whiteline Sway bars. 

www.patricklipp.com
www.mytechliving.com

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Topic starter Posted : May 26, 2020 11:27 am
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marsrock7
(@marsrock7)
Reputable Member

Looking really good.

And I will be third (I think) to vouch for PLX gauges. Very happy with my DM-6. Only thing I would change is add adaptive brightness. In the country (real dark) at night it can be distracting. Good thing mine is inside the cubby... Just gotta close the lid 🙂 

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Posted : May 29, 2020 1:34 am
Patrick Lipp
(@pattielipp)
Guy with car Admin

Haven't just been sitting idly by, but have been away from the forum for a while. I've been needing to get a few parts to bring the car back to a point where i'm comfortable.. more of the maintenance thing than anything else to get the car running as it should. Anyways, a few weeks ago I finally purchased the Idle Air Control Valve which should hopefully fix the idle issue, and I also got a new timing chain tensioner to fix that oil leak. I forsee a new valve cover gasket at some point as well, othewise, the car runs well, sounds good and is getting closer to where i'll be comfortable finally installing the turbo... Another year down of it all getting done... I suppose it's a slow process, but it's getting done the right way.

www.patricklipp.com
www.mytechliving.com

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Topic starter Posted : December 18, 2020 8:51 am
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