SC560 Question to owners

[sealandsky]

I have a 2019 Yukon SC560 and have a question for other SC560 owners. Callaway advertises that the SC560 makes 560 HP at 6200 RPM. However, my vehicle's rev limiter cuts off the engine somewhere between 5850 and 5900 RPM. I'm curious as to what others out there are experiencing. I've reached out to both Chuck and Chris at Callaway via email a few weeks ago, but neither has respond to my question so am starting to wonder if there is an issue with the SC560 that they cannot explain.

[BIGJOHN]

The rev limiter is set by GM.
If you change that it may Affect your warranty.
I don’t think Chris is with Callaway at this time.

[SurfnSun]

As John stated, Chris isn’t with Callaway anymore. I’d email Pete Callaway, he will point you in the right direction.

[sealandsky]

The rev limiter is set by GM.
If you change that it may Affect your warranty.
I don’t think Chris is with Callaway at this time.

The ECM is originally set by the factory, Callaway's reprogramming with the SC560 raises it some, but Callaway's own spec's on their website state "560 HP @ 6200 RPM - I'm not making this up. I hit the limiter at or before 5900 so am wondering about the validity of Callaway's figures.

[sealandsky]

As John stated, Chris isn’t with Callaway anymore. I’d email Pete Callaway, he will point you in the right direction.

Thanks, I'll try calling and see who I can connect with.