I'm a bit confused with the wiring of the LC-1.
It makes sense to connect the sensor ground of the LC-1 to the MS sensor ground, but should the LC-1 power ground be connected to MS sensor ground as well?
Currently I have MS grounded to the battery and the power ground goes to the same point. All the sensor grounds are connected to MS sensor ground.
/rikard
Innovate LC-1 power ground
- Rikard
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- Joined: Mon Nov 09, 2009 12:58 pm
Innovate LC-1 power ground
1977 Bus, 2.0L Type 4 engine, webcam 107i
MS2 Extra, direct fire EDIS Coil
MS2 Extra, direct fire EDIS Coil
- ps2375
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Re: Innovate LC-1 power ground
I would ground the power ground away from the MS sensor and MS ground.
- CBDZ
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- Joined: Mon Jun 01, 2009 9:22 am
Re: Innovate LC-1 power ground
I'm going to piggy back on this thread so to keep grounding questions all in one spot.
How should I ground all the engine sensors? I know that they need to be grounded back to the MS, not the engine block (main chassis ground).
I guess what I looking for is should I bring an individual wire from each sensor all the way back to a single isolated grounding post, which then has a short heavier gauge wire directly to the MS grounding plain..
or
Can I use a heavy gauge wire that runs to the furthest sensor, and tap the sensors into this wire?
If this doesn't make sense, I can create a diagram of these two layouts.
How should I ground all the engine sensors? I know that they need to be grounded back to the MS, not the engine block (main chassis ground).
I guess what I looking for is should I bring an individual wire from each sensor all the way back to a single isolated grounding post, which then has a short heavier gauge wire directly to the MS grounding plain..
or
Can I use a heavy gauge wire that runs to the furthest sensor, and tap the sensors into this wire?
If this doesn't make sense, I can create a diagram of these two layouts.
My Car Details:
Fiberglass Buggy on 1973 Chassis.
1904 cc
Megasquirt (MS1 with 3.57 board) Fuel Injection: German Intake Plenum, CB Performance End-Castings, Ford Escort Throttle Body with custom Adapter, MS controls Wasted Spark Coil Pack
Fiberglass Buggy on 1973 Chassis.
1904 cc
Megasquirt (MS1 with 3.57 board) Fuel Injection: German Intake Plenum, CB Performance End-Castings, Ford Escort Throttle Body with custom Adapter, MS controls Wasted Spark Coil Pack
- Dale M.
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- Joined: Mon Oct 05, 2009 8:09 am
Re: Innovate LC-1 power ground
Grounding is a science.... Technically all grounds should be at SAME POINT to prevent signal loss and keep noise to minimum....
Go to car stereo shop and get ground bar adapter and connect all grounds there....
Check EBAY for "power distribution blocks"
Run LARGE conductor (#6 or #8) from ground bar to battery post (not frame) ....All MS and sensors ground to adapter block...
Dale
Go to car stereo shop and get ground bar adapter and connect all grounds there....
Check EBAY for "power distribution blocks"
Run LARGE conductor (#6 or #8) from ground bar to battery post (not frame) ....All MS and sensors ground to adapter block...
Dale
"Fear The Government That Wants To Take Your Guns" - Thomas Jefferson
1970 "Kellison Sand Piper Roadster"
1970 "Kellison Sand Piper Roadster"
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Re: Innovate LC-1 power ground
This^^^^^^. Power grounds to common point on block, they ground power cables @ 12v, sensor grounds to ECU sensor ground cable only, often 5v. Keep both types separated, keep it simple, I use a rubber cotton reel mounting for sensor grounds, all on the one stud, easy to add extras if needed for any reason.ps2375 wrote:I would ground the power ground away from the MS sensor and MS ground.
- Dale M.
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- Joined: Mon Oct 05, 2009 8:09 am
Re: Innovate LC-1 power ground
Essentially it all goes to "ground"!!!....... Ground MS and sensor that connect to MS that use 5 volts to a "common" ground point ... All power grounds 12 volt (other car electricals) , does not really matter....buildabiggerboxer wrote:This^^^^^^. Power grounds to common point on block, they ground power cables @ 12v, sensor grounds to ECU sensor ground cable only, often 5v. Keep both types separated, keep it simple, I use a rubber cotton reel mounting for sensor grounds, all on the one stud, easy to add extras if needed for any reason.ps2375 wrote:I would ground the power ground away from the MS sensor and MS ground.
Dale
"Fear The Government That Wants To Take Your Guns" - Thomas Jefferson
1970 "Kellison Sand Piper Roadster"
1970 "Kellison Sand Piper Roadster"
- Dale M.
- Posts: 1673
- Joined: Mon Oct 05, 2009 8:09 am
Re: Innovate LC-1 power ground
Essentially it all goes to "ground"!!!....... Ground MS and sensor that connect to MS that use 5 volts to a "common" ground point ... All power grounds 12 volt (other car electricals) , does not really matter....buildabiggerboxer wrote:This^^^^^^. Power grounds to common point on block, they ground power cables @ 12v, sensor grounds to ECU sensor ground cable only, often 5v. Keep both types separated, keep it simple, I use a rubber cotton reel mounting for sensor grounds, all on the one stud, easy to add extras if needed for any reason.ps2375 wrote:I would ground the power ground away from the MS sensor and MS ground.
Dale
"Fear The Government That Wants To Take Your Guns" - Thomas Jefferson
1970 "Kellison Sand Piper Roadster"
1970 "Kellison Sand Piper Roadster"
-
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Re: Innovate LC-1 power ground
Yes, in my opinion, if you do connect the sensor grounds to a common point, that common point probably should be connected to the MS with a heavier cable (but not ridiculous like a battery cable) to keep the resistance in that shared wire low. The current through the sensor wires is pretty low though, so it's not nearly as important as just not grounding them to the engine block.CBDZ wrote:I'm going to piggy back on this thread so to keep grounding questions all in one spot.
How should I ground all the engine sensors? I know that they need to be grounded back to the MS, not the engine block (main chassis ground).
I guess what I looking for is should I bring an individual wire from each sensor all the way back to a single isolated grounding post, which then has a short heavier gauge wire directly to the MS grounding plain..
or
Can I use a heavy gauge wire that runs to the furthest sensor, and tap the sensors into this wire?
If this doesn't make sense, I can create a diagram of these two layouts.
The reason you do not want to ground sensors to the engine block is that with all the other electrical items on the engine, there is a lot of current flow through the ground path (engine -> ground strap -> chassis -> ground cable -> battery). Since that path is not zero resistance, there will be a voltage difference across it. That means that the MS "ground" and engine "ground" are not actually at the same voltage potential. This difference would cause a bias in the sensor readings. Additionally, because the current through the ground path isn't constant, you will get random fluctuations in the voltage bias that will cause troublesome noise in the sensor readings.