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Thank you, that seems straightforward enough. Is there any video or written guidance about going about that?

Sorry -- that's real time. Delta time is 00:05:02.

I've been working on a stock bottom end LS3 that has had an LSA supercharger added. The tune is MAF only, and it seems to be working well except for a bizarre thing that happens every now and then:...

I agree... it seems the ECM isn't seeing the signal. Check the wire for continuity, I guess, if you haven't already.

Double check your wiring, I guess. If the scanner doesn't see AC pressure, neither does the ECM. You should have 5V from the ECM to the sensor along with ground, and a 0.5V to 4.5V signal coming from...

I've been through this with a GMPP crate motor. What you are calling a three wire "switch" is actually a pressure sensor. Can you see the AC pressure as seen by the E38 via the scanner? What pressure...

Right, that's what I thought too. There's a bunch of these engines out there on the street, and I've always wondered why GM would sell that motor with that cam for street use. It would seem to me...

What cam does the 525 use? I've tuned a stock LS3 in a 69 Camaro using the GMPP E67 controller. The GMPP tune is pretty conservative. We picked up 40 hp peak, and a ton under the curve in a couple...

I got it working just an hour ago. Support gave me access to the 2.25 beta, and that works. I'll send your other one right back to you.

Fixed. Many thanks to Dave Steck.

Net: The GMPP crate motor E67 OS does not and can not support PWM fans or AC pressure sensors. You have to use a late model passenger car E67 and OS.

Answering my own question:

52467

Another (related) question: does anybody have a line on the voltage vs pressure map of the GM AC refrigerant sensor (AC Delco pn 15-51258)? I've been in contact with a vendor about a standalone fan...

I'm going down the salvage yard E67 path. Tonight's experiment shows that the crate motors don't read the AC pressure sensor either.

Thanks Alvin. I gave that a shot... but no joy. Any thing I can do to investigate this more?

OK, I've picked up an E67, pn 12633264, and I've found a ZR1 tune in the repository. Now to get the ZR1 OS flashed onto the E67. How does one do that?

Any help appreciated!

So, here's what I've learned last night/today. My E67 (GM PN 12636660) started life intended for 07-08 Hummers. I think it's true that 07-08 E67s are incompatible with OS's written for 09+ E67s.
...

Tune file:

Yes, I can post the tune. I have no access to a C6 ZR1...

Disabling in the OS makes a lot more sense than in the hardware, I agree, and if that's true, then replacing the ECM won't help.

Sorry I'm slow on this, but get another (non-crate) ECU, connect it to the harness, and simply write the full calibration out from my existing tune?

So... pick up a junk yard E67, and overlay my calibration? Will I have VIN number issues?

thanks

I've got an LS9 crate motor in a 69 Camaro, complete with A/C pressure sensor and C6 fan controller, and I changed the crate motor fan configuration to use PWM instead of discrete.

After days of...