TipsyMcStagger

iTrader: (1)

I have a 24x LS2 from an '06 GTO with an E40 PCM. I'm nearly 100% certain (based on research) that if desired, this engine can be operated DBW with the stock LS2 90mm TB using:

- 2003+ "truck" 12586243 blue/green ECM flashed to 2004 Corvette OS
- 2004 C5 TAC
- 2004 C5 Gas pedal

Assuming the above is correct, does this setup require LS1 type knock sensors to be installed externally? Or can the stock LS2 knock sensors be retained?

TIA.

Tipsy

dw456post

The 2006 GTO uses the external knock sensors that bolt to the outside of the block just behind the motor mount brackets. Did you get the engine wiring harness?
If you use the external knock sensors, you don't have to change out your valley cover to the LS1 style.

TipsyMcStagger

iTrader: (1)

I have the complete 2006 GTO "dropout" including the E40 PCM and harness. For various reasons, I'm considering switching to an LS1 computer setup like the one I've outlined above. To my understanding, when the 411 PCM is used on the LS2, regular LS1 (under valley) type knock sensors must be installed outside the block in (or near) the location of the stock LS2 knock sensors.

This post implies that the stock LS2 knock senors can be retained if a 12586243 blue/green ECM is used. That's the only reference I have seen that suggests that stock LS2 knock sensors can be used with a LS1 type ECM, so I'm trying to verify whether that information is accurate.

Tipsy

mrvedit

While I do not have the answer (and am exploring this issue myself), here are some threads on the subject of using LS2 sensors with an LS1 (411) PCM:

https://ls1tech.com/forums/pcm-diagn...w-ls1-pcm.html

https://ls1tech.com/forums/pcm-diagn...ensitiviy.html

https://ls1tech.com/forums/pcm-diagn...-computer.html

https://ls1tech.com/forums/pcm-diagn...-01-5-7-a.html

http://www.hptuners.com/forum/showth...a-Ls1-Pcm-!-!-

Correct me if I am wrong, but my summary of those threads is:
1. LS2 knock sensors can be used with '99-'02 PCMs
2. It requires a special wiring harness
3. The wiring harness needs to be pinned into the PCM differently than LS1 sensors
4. EFI Live has the ability to select the knock sensor type
5. The sensitivity is adjusted a bit.

As far as I can tell, HP Tuners does not have the ability to select knock sensor type.
Edit: Correction - HPT 2.24.1064 finally allows selecting the know sensor type.

LSX Power Tuning

iTrader: (4)

All that is correct.

NicD

iTrader: (7)

Nope, in most calibrations this is what you will see with HPT. And yes you can do all of those things and they still won't work any better than drilling/tapping the side for the stock ls1 style knock sensors and tweaking sensitivity settings.

LSX Power Tuning

iTrader: (4)

In 98-00 f bodys the tables are not there, in 01 & 02 they are.

NicD

iTrader: (7)

Yeah I said most but I guess I assumed he would use the "newer" preferred operating systems with either the 411 or blue/green computer.

mrvedit

Maybe its just me, but one of my headers doesn't leave room for an LS1 knock sensor sticking out from the block. I therefore tapped an available hole in my oil pan for one knock sensor, but I don't know if that would even work.

There are 100+ previous threads on the subject of LS1 versus LS2/LS3 knock sensors and I am hoping this thread can lead to definitive answers. It seems close already.

TipsyMcStagger

iTrader: (1)

That's a concern of mine as well. Hence my desire to retain the stock LS2 knock sensors, if viable.

Tipsy

mrvedit

I don't see these tables using HPT with my 411 which I believe has the latest OS.
Are you saying I have the tables but HPT cannot change them? Only EFI Live?

I opened stock tunes from a few other years and never saw the Knock Sensor options in post #6.
Edit: HPT 2.24.1064 does finally allow selecting the know sensor type.

LSX Power Tuning

iTrader: (4)

If the table is there in HPT then you can edit it. I just looked back at all the ones I done on my personal cars and I used the 2002 12212156 OS on all of them. That OS EFI & HPT has the table to edit the knock sensor type.

mrvedit

Not to hijack this thread, but I still cannot find the knock sensor config option.
I have HPT 2.24.152
The loaded tune shows OS 12212156 (Under Edit->Calibration details)
I have Edit-View set to "Advanced".

Edit: Correction - HPT 2.24.1064 does finally allow selecting the know sensor type.

LSX Power Tuning

iTrader: (4)

This is a 2002 Camaro

mrvedit

That is what I have. See attached image. Are you running a later (beta?) version of HPT?

Thanks.

LSX Power Tuning

iTrader: (4)

That was with 2.24.1064...I didnt check it in beta

TipsyMcStagger

iTrader: (1)

Okay, obviously some very knowledge contributors to this thread. But I'm just a little bit lost. For the sake of clarity, can we detail (1) what components (TAC AND pedal), (2) computer model number(s) and (3) OS flash are required to operate a stock LS2 (DBW) with a LS1 type computer while retaining LS2 knock senors?

TIA.

Tipsy

mrvedit

Indeed 2.24.1064 does show the knock sensor types. Mystery explained!

Now, who knows the OP's question about the TAC, Pedal and other parts?