C8 powertrain details

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Nov 7, 2019 | 09:16 AM

dfettero

Thread Starter

Burning Brakes

Joined: Jan 2016

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C8 powertrain details

https://www.corvetteblogger.com/2019...ys-powertrain/

Nov 7, 2019 | 05:47 PM

NORTY

Race Director

Joined: Dec 2005

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From: Carlsbad Ca

Awesome find! Thx.

Nov 12, 2019 | 01:50 PM

usrodeo4

Drifting

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Quote:

Originally Posted by dfettero

https://www.corvetteblogger.com/2019...ys-powertrain/

Thanks for the post...I was hoping they would have gone into a bit more detail on the engineering behind the "boosted shift", as it seems they have utilized some of the gear box mechanical inertia to aid forward performance during shifts in Performance Launch mode, which has me scratching my head a bit.

Nov 13, 2019 | 05:19 PM

Shaka

Safety Car

Joined: Nov 2002

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From: FLL Florida

Quote:

Originally Posted by dfettero

https://www.corvetteblogger.com/2019...ys-powertrain/

Outstanding. Thanks.

Nov 14, 2019 | 10:01 AM

NY09C6

Le Mans Master

Joined: Sep 1999

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From: Texas

Good info. That trans fluid is about $25 a liter and it calls for 11L with 45k change intervals. Add labor and that is quite expensive.

Last edited by NY09C6; Nov 14, 2019 at 10:01 AM.

Nov 22, 2019 | 10:35 AM

EJ1

Heel & Toe

Joined: Jul 2009

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From: NY NY

C8 Automatic DCT Durability Forecast given poor C7 A8

I am not sure why the fine engineers who present this DCT transmission with such technical confidence were not able to achieve customer-pleasing durability in the C7 A8 given that transmission’s 10,000 mile service life between shudder repairs that often take over 30 days to complete.

My C7 Z51 is back at my selling dealer now to address shudder despite prior transfusion of new release fluid and replaced but similarly weak torque convertor.

Despite Terri Schulke’s design assurances, I’m not sure why we should believe durability on the C8 will be better given GMs 8L90/8L45 A8 troubles, nor why we who have placed trust by purchasing a C7 have to sue GM for customer satisfaction with our vehicles.

I don’t see Corvette car clubs pressing this with GM either surprisingly lining up their members to see and order the C8 despite the C7s poor durability.

The fact that a large percentage of Corvette dealers do not allow pre-purchase test drives also implies GM has no doubt they will deliver on customer expectations despite lots of data at Manufacturer to the contrary.

I won’t order any series Corvette in the future without a significant test drive. The trans shudder is not perceptible until car is fully warm.

See class action details:

https://www.classaction.org/gm-8-spe...efect-lawsuits

and frustrated owner video:

Spoiler

Last edited by EJ1; Nov 23, 2019 at 08:18 PM. Reason: spelling

Nov 22, 2019 | 02:38 PM

Racer X

Le Mans Master

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From: North Dallas 40 TX

The two transmissions are not remotely related. You can’t draw any conclusions about the duct durability.

Nov 22, 2019 | 03:50 PM

EJ1

Heel & Toe

Joined: Jul 2009

Posts: 20

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From: NY NY

We’re talking about GM Mark of Excellence—that’s related

Quote:

Originally Posted by Racer X

The two transmissions are not remotely related. You can’t draw any conclusions about the duct durability.

Manufacturers should have a philosophy not to release questionable product that doesn’t stand up in pre-release testing or years of customer field use.
The full text PDF of the class action lawsuit details Customers expectations regarding engineering durability.

That philosophy is related to a “GM Mark of Excellence” that clearly doesn’t have meaning anymore.

What’s related is some of the same engineers professed the engineering excellence of the 8L90.

Fool me once shame on you. Fool me twice shame on me.

Last edited by EJ1; Nov 22, 2019 at 04:24 PM. Reason: spelling