3X2

I'm in the process of installing a dry sump LS3 into a C5. It would make life easier if I could convert the pcm to a E38 pcm. Is it just a matter of wiring the C5 pcm harness to the corresponding pins in the E38?

Vetteman Jack

Moved to C5 Tech.

ChrisLSx

How? Just get the appropriate adapter harnesses and the LS3 will run fine on the C5 ECU. Look at what others have done as there is no need to reinvent the wheel here.


I doubt the C5 BCM/gauges/modules/etc. will talk to the E38 PCM (E38 is CANBus), so you will likely lose everything in the car. So if your goal is to have a stripped down/race only car, then yes, it's a simple matter of rewiring the C5 engine harness to use the E38 PCM. If you want to actually have an otherwise "normal operating" C5, then no, it's not a simple matter.

3X2

Thanks for your thoughts. I've done a few LS3/7 C5 conversions. The problem is where to mount both the pcm and tac module when the dry sump tank takes up the area where they are normally located.They have all been race cars and mounted the C5 pcm/tac module on the floor or removed the glove box and mounted them there. The e38 would fit nicely where the a/c receiver/dryer used to sit, or I could mount where it is in a C6. I've used the Lingenfelter translator box before with the 58x trigger wheel and had 24x/1x engines built. The real question is where to mount the pcm/tac in a street C5.

ChrisLSx

I assume you are relocating the battery to the trunk correct? Can you mount the PCM and TAC in/around where the factory battery went? I realize the dry sump tank also passes thorough this area but I'd think they could both be made to fit.

ChrisLSx

Check out this thread:

https://www.corvetteforum.com/forums...-complete.html

3X2

Battery relocation is not a problem. I use a fabricated drop in battery box with a lid using a C6Z battery and cables.
They won't fit there with the tank, neither stock GM, Peterson, a.r.e. I've used them all in different builds. The C5 pcm is too bulking to mount ala C6 even if I mount the tac in another location.

3X2

Their choice for a retangular/trapazoidal tank is not good. No one uses anything but a round tank. Probably works ok for a street car, but not a dedicated race car.

ChrisLSx

Are you sticking the battery in the center or side wells? Where do you purchase the C6Z cables? Do you have some pictures as I'm planning to relocate my battery for long-term LS7 swap plan.

3X2

Battery goes in the r/r cubby hole. The box I have made requires cutting out the cubby hole. It drops down from the top and is secured to the tub with bolts and nutserts. Stock C6Z battery cables from a GM dealer. Carpet may or may not fit. I weld a battery ground stud same place as a C6Z or you could weld a 3/8" bolt to the top of the rear impact bar, drill a hole in the rear of the tub, and run the ground cable to the stud.

The car that has this box is not here so I can't take pictures of it.

ChrisLSx

How much does the box cost and how would I get one made?

3X2

Let me find out. I'm in the process of building a dry sump car right now. I need one for this car.

ChrisLSx

No big rush. Just when you can, I'd love to have one. Are you making them out of fiberglass or metal?

3X2

aluminum

mykream

3x2 did you get anywhere with this?

3X2

I ended up using the stock pcm and tac module mounted to the right side of the trans tunnel.

mykream

Well darn, was hoping you got it figured out. Im interested in this being a possibility. I assume it would need some form of can bus translation.

I don't think it would be any more difficult than integrating a stand alone

Tsumi