Update: I got the autocross eLSD calibration and you can too! Short version is that you need a dealer service tech that is willing to hang up on GM Techline and call back if the Techline person doesn’t know what to do (and repeat as many times as necessary).
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Some of you with SS 1LEs that compete in F Street may have seen the
latest Fastrack update. If you haven't, this is the part that matters:
Quote:
#34840 Camaro ediff tune legal?
Thank you for your letter. Per Section 13.9.H: "Manufacturer authorized, vehicle-specific OEM ESC/TC
software upgrades / updates are allowed." Per the definition of traction/stability control in Section 12 this
allows manufacturer authorized tunes on active differentials.
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So, that leads me to this question:
Has anyone recently had the autocross eLSD calibration done for their SS 1LE?
I just left my local GM Performance dealer and the calibration was not done because they couldn’t find it. I gave the service advisor the part number that’s been posted on this forum a bunch of times and they spent an hour on the phone with GM Tech Line looking for it, but no joy. When I got the car back, the service ticket included the exact same text in the quoted dealer note in
Chris V’s post from 2018 (truncated at a point in the first sentence of the “Calibration Details” section):
Quote:
Note to Dealers:
When reprogramming the Chassis Control Module, please call Techline Customer Support Center (TCSC)
at (1-800-828-6860). The TCSC will provide programming requirements and instructions. When calling
TCSC, please insure the specific vehicle VIN is on hand.
Dealer Piece Cost for Calibration will be billed to the BARS/Open Account monthly via Techline. Dealer
Statement will include the 17- digit VIN, Part Number Reference “eLSD" and Dealer Piece Cost. The
labor for download and re-flash of the module is to be charged to labor OP 0602518 at an allowable 0.3
hours.
Warranty Information:
Reflashing the eLSD Control Module with this calibration maintains the vehicle’s warranty.
Calibration Details:
Continuous on-track and street development combined with the pursuit of perfection have pushed our
<-- text description ends on my service ticket here; text from Chris V's post continue below -->
Camaro engineers to develop an eLSD calibration that will enable faster turn in and faster power
application on turn exit. This eLSD calibration will decouple the differential at a faster rate based on
accelerator pedal position and steering wheel angle to enable faster yaw rotation at corner entry and
upon corner exit the eLSD will couple faster than normal rates to enable power to be delivered sooner
to both rear wheels.
Note: The change of eLSD calibration will only be enabled when Traction Control and Electronic Stability
Control (ESC) is disabled. When traction control and ESC is enabled, there is no change to the
production calibration in any mode (Tour, Sport or Track). To disable traction control and turn
ESC off, hold down the Traction Control button for 5 seconds. The traction control and ESC
telltale lights will illuminate in the dashboard.
Installation
Note: This upgraded eLSD calibration is a customer pay transaction and should not be submitted as a
warranty claim. The only submission to General Motors is for 0.3 hr Labor.
1. Drive the vehicle to your dealer and have the calibration updated to the applicable calibration listed in
Calibration Reference Table below.
Calibration Reference Table
Model Year Calibration Part Number
2017-2018 84506758
2019-2021 84506759
2. Clear any DTC that set during the flashing.
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The part number I gave them for my 2020 car was 84506759. From Chris V’s post and everything else posted anywhere since, that should be the number for 2019+ cars and 84506758 for 2017-2018 cars.
I’ve seen other posts where people have said their dealers have had trouble finding the calibration and I’ve seen people post that they’ve had it done, but I don’t think I’ve seen anyone say that they’ve had success after having difficulty or that they’ve had it done recently.
Does anyone have any info to share? Thanks!