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Old 03-21-2005, 12:38 AM   #1
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Grounding

Ok for a while now Ive been curious on knowing this. I have an electrical background so this may be rambleing a little.

We have an iron block and an aluminum head.

Aluminun is used to conduct electricity in HV powerlines couse its cheap and at 100KV+++ the loss of power is minimal in a % value. Copper is used in a more High effieciency switch gear and electronic circuits, the distance of these runs are usually much less and efficiency is much higher of a demand.

So wouldn't this suggest that each spark plug should have a ground strap as well as all the components connected to the block? Alternater, A\C, ECU, battery and so on, landing on one centralized location.

I understand that the power loss is minimal in the car but like the aluminum power line, a 15% loss is still 15KV. wich means your alt and other acc's haft to work 15% harder to make up the difference. of course these numbers are not acurate but used as example sake.

So the grounding kits they offer in general don't actually seem to be as complete as they should be. If you ground the block and the head together and ground those to the chassi and ground the battery to chassi with larger wire, what good does this do you when you still have the plugs still grounded to the aluminum head.

Just trying to figure out what these grounding kits are really suppose to offer I guess. Wouldn't it be easier to just ground the battery to the chassi with a more appropriate gauge wire and leave the rest alone or just do it right the first time and ground the components themselves to a centralized location on the chassi?

Like I said I am rambleing and I know the answer to these questions already, but what I'm looking for is the biased opinion of others on this thought. Or so be it, this is a Debate issue more than anything else I suppose. So lets hear what you guys think on this.


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Old 03-21-2005, 07:48 PM   #2
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I'm following ya, but then again, I'm not.
I just don't see how an external ground on the plugs is going to help.
The other question would be, where would you put a ground on the plug,
that would not interfere with the juice coming from the coil?
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Old 03-21-2005, 09:47 PM   #3
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It eliminates electrical noise in the block thus letting the engine sensor work better.
The signal-to-noise ratio is smaller, thus the sensors have a lower detection limit.

By lowering the Limit of detection of the sensors you increase the dynamic range of the sensors between the limit of quantitation and the limit of linearity.

Basically the you ground the high-voltage components so that the lower voltage sensors can operate better.

Brian


edit: Go get an oscilloscope and hook it up between the grounds of different components and the engine block, you should see some charging on the block.
 
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Old 03-21-2005, 10:09 PM   #4
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i dont know much about all the electronics in a car, i put a ground kit on my car ....battery to chassis, engine block to bat ground, fuel rail to chassis, and another engine to chassis by the fuel rail....im not an expert on what its supposed to do, all i know is it did something. The car feels smoother when i excelerate, smoother at idle, and some of the surgine went away, so im happy with it. I used 4ga wire w/ cooper or silver connectors.
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Old 03-22-2005, 12:26 PM   #5
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perhaps this should be moved to the SVT or general performance section...
 
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Old 03-24-2005, 12:51 PM   #6
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anyone else want to weigh in on the subject? or has it been covered thoroughly enough?

What parts have people grounded on their Foci?

Brian

Last edited by HTPerformance; 03-24-2005 at 03:55 PM.
 
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Old 03-25-2005, 11:08 PM   #7
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HTperformance, you hit the nail on the head. You see exactly what Im treing to say. On the scope there is so much noise, not just by the plugs but at the sensors themselves. On the scope you should see a nice pulse like you would see on an EKG. but instead you get what apears to be nothing but a thick wave of white noise.

If I where to groung a plug it would be on the lower portion of the metal jacket where it is round still. I would use a metal spring lightly coated in grease for corrosion. Then I would solder a flat steel braided cable to the spring itself. This way you could remove it easily for a plug change and place it back onto the new one easily. I would hit two ground points with all four ground straps, one on each of the four bolt secureing the coil pack and then join all four straps onto the chassi at the chassi battery ground.
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Old 04-02-2005, 10:55 AM   #8
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The main issue with our cars is just the ground straps in general. The block strap is 6gauge...why? The chasis ground is like 12gauge...why?

But direct grounding, how much of a differnce will it make? I doubt much of any.
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