Proof read my wiring diagram and a couple of LS1 related questions.

[One Armed Bandit]

Hey All,

Bought an Extreme G4x last week and just want to get someone to proof read the attached diagram I edited for my application

Engine is an NA ls1 using cable throttle, stock sensors plus some extra non stock sensors & Links canbus wide band setup. I am planning to use the stock loom and just remove what I dont need & generally modify to suit.

Notes:
- I dont mind seeing the fuel level jump around as it tells me how much I should trust it or let it stop sloshing around.

- I forgot to put the writing next to the Knock sensors but I know what wires that will be.

Questions
 - It seems the stock ecu returned the signal ground to the ecu for the coilpacks but on the diagram I found it sends it to the head, which way should I do it?
- Each sensor seems to have its own signal ground to the stock ECU but Am i right in assuming with the Link I can just connect them together to a single gnd out.

- What type of wire needs to be used for shielding the Knock sensors, would it be safe to assume the GM loom had this shielded wire already.

- The diagram i used to build mine had the Can and Cam sensor getting 12v from battery but in the link help documents it says to use 8v & other places Ive seen say 12v so Im not sure what would be best or even if it matters.

Im sure ill have more questions as I go along, but thanks for your help.
 

[Adamw]

9 hours ago, One Armed Bandit said:

- It seems the stock ecu returned the signal ground to the ecu for the coilpacks but on the diagram I found it sends it to the head, which way should I do it?

The LS1 coils arent particularly sensitive to ground offset, they "switch on" somewhere around 1.7V.  The coil signal ground connected to ecu sensor ground is the most correct so that is fine if your wiring is already done that way.  

 

9 hours ago, One Armed Bandit said:

- Each sensor seems to have its own signal ground to the stock ECU but Am i right in assuming with the Link I can just connect them together to a single gnd out.

Yes, the 4 "Gnd out" and the "Shield/Gnd" pins are all sensor grounds - you can connect all sensors to just one if you like or spread them around.  Whatever is easiest.

 

9 hours ago, One Armed Bandit said:

- What type of wire needs to be used for shielding the Knock sensors, would it be safe to assume the GM loom had this shielded wire already.

I would expect the factory wiring is already shielded.

 

9 hours ago, One Armed Bandit said:

- The diagram i used to build mine had the Can and Cam sensor getting 12v from battery but in the link help documents it says to use 8v & other places Ive seen say 12v so Im not sure what would be best or even if it matters.

Most LS1's have the 24X trigger system which are powered from 12V from the factory.  But they work fine on 8V and that is often convenient since you have the 8V pin there doing nothing otherwise.  Engines after about 2006 that used the 58X trigger system are 5V.  

 

Otherwise everything else except your CAN lambda looks ok - that 12V supply needs to switch on/off with ignition.  

[One Armed Bandit]

Thanks Adam!

Big help, ill fix up the Can issue, nice to know im mostly on track

[One Armed Bandit]

So I built the loom to the below diagram. Just wondering 3 things

1. Did i get a bit carried away and join to many sensor gnds together? I was trying to keep the body and engine grounds seperate but once i put it together i was wondering I was making issues.

2. Turns out the stock LS loom doesnt have shielded wires in it so my knock sensors are not shielded. Seems GM didnt worry about it so do I need to or should i?

3. Does it matter what pin the ground from the heads of the motor go to, as there is 4 pins but Im only using two (should i be using more also?) 

Cheers

[Adamw]

1. Not too sure what you are asking here.  As long as the splice is structurally sound then it is fine.  I generally find about 8-10 wires is about the most im comfortable with when using a typical closed barrel splice.  More than that and the outer wires tend to get quite stressed.
2. Hard to guess.  
3. If you have High impedance injectors and no e-throttle then just 2 grounds should be fine.  If low imp inj then you will want all 4.

[One Armed Bandit]

Hi Adam.

Thanks, some follow up below

1. Just to clarify, i was wondering on the electical side if there is issues with the number of sensors grounds I have going together to one pin. The splice physically I am happy with (is done through two splices with bridging wire between) but not sure if the ecu was going to be happy with so many grounds coming back from just on one pin or if the wire going from the splice to the ecu needs to be upsized since it has so many running through it.

2. Ill speak to the tuner see what his preference is

3 Cool, LS is high impedencwe and no e throttle on mine so all good. 

Cheers

 

[Adamw]

11 hours ago, One Armed Bandit said:

Just to clarify, i was wondering on the electical side if there is issues with the number of sensors grounds I have going together to one pin. The splice physically I am happy with (is done through two splices with bridging wire between) but not sure if the ecu was going to be happy with so many grounds coming back from just on one pin or if the wire going from the splice to the ecu needs to be upsized since it has so many running through it.

Yes that is fine, they are only a few mA each.