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Old 08-21-2013, 10:28 AM   #1
Jabs
 
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2015+ Corvettes could have Start-Stop Tech added later

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MONTEREY, California — General Motors considered stop-start technology for the redesigned 2014 Chevrolet Corvette Stingray but opted against it, deciding it would hurt the car's image. But GM may be forced to make it standard later this decade.

"It is more mass and more cost," Tadge Juechter, Corvette chief engineer, told Edmunds. "It is very disconcerting to have your lively, great-sounding engine stall every time you come to a stop. The real customer value, the real environmental value is zero. So you are hauling around all that stuff to get a better label value (for mpg on the window sticker). It wasn't worth it."

Juechter was interviewed during a 2014 Corvette Stingray press event here.

The highway fuel economy for the 2014 Corvette Stingray has increased nearly 12 percent, compared with the 2013 model. Equipped with the standard 6.2-liter V8 and new seven-speed manual transmission, the new car is rated at 17 mpg city/29 mpg highway, according to the EPA.

In comparison, the 2013 Corvette with the 6.2-liter V8 and six-speed manual transmission is rated at 16 mpg city/ 26 mpg highway.

What General Motors might be required to do in several years to boost the Corvette Stingray's fuel economy has not been determined. Federal regulations mandate each automaker to increase the vehicle fuel economy of their fleet 4 percent annually through 2025.

Asked if it is inevitable that stop-start technology may be standard on a future Corvette Stingray, Juechter said "it may be."

"But is that something we lead in (with the redesigned car)," he mused. "Or is that something we do when we are forced to do? It is possible."

Stop-start technology shuts off the engine at idle, for example, at a traffic light. The engine restarts when the driver takes his foot off the brake and moves it to the accelerator. Juechter said stop-start technology would boost the car's fuel economy about 2 mpg in the city.

A larger, heavier battery would be required, which would fit where the current battery is located. If offered, the driver would most likely be able to disable the feature.

Besides the addition of a seven-speed manual transmission to help boost fuel economy, a significant contributor is cylinder deactivation. Fuel to four of the cylinders is cut off at highway speeds, essentially turning the V8 into a V4, he said.

"I tell people the real car can get what the label says," Juechter said. "I have gotten a lot better than the label. Driving up north in Michigan, I have gotten 38 mpg, cruising along in the new Corvette with the cruise set at 63. You are idling essentially in four-cylinder and I got 38 mpg over a 25-mile moving average."

Speaking of regulations to boost fuel economy, he said "eventually you are going to see a bunch of compromises."

In the future, Corvette "customers will have to put up with changes from what they traditionally expected in order to get better economy."

He did not elaborate.

But one thing is certain, Juechter said. There are no plans to offer a hybrid version of the Corvette Stingray. The car's platform was not designed to accommodate an electric motor and a large battery pack.

Here's the Article from Edmunds: http://www.edmunds.com/car-news/futu...echnology.html
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Old 09-04-2013, 03:01 PM   #2
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This is interesting. Has anyone here ever driven a car with the S/S technology? I have. I rented a Mercedes wagon in germany one time that had this feature. I have to say I REALLY liked it. BUT...

with that said I would be bent out of shape if it were a mandatory feature on a Corvette.

I am in no position to question the comments made by Tadge, but maybe I need some clarification on why the S/S technology has no "real customer value" and no "real environmental value." He went on to say it boosts city MPG by 2, and less time idling at a traffic light by default reduces environmental impact... even if it is only at 10 red lights for 2 minutes each.
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Old 09-04-2013, 04:21 PM   #3
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Does the car have to be fully warmed up for S/S technology to work? Starting a cold engine several times at lights seems silly.
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Old 09-04-2013, 05:03 PM   #4
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I do product training for BMW and its not a problem at all, saves 4 pct in gas and only works when about 25 criteria are met. It also is totally programmable to be shut off if you don't like it....


By the way, I got an email back from RANGE today that they will have a module that kills vette cyl deactivation, just like they have for the automatic camaro v8....it works so well...I love it.....I never have the "tug" of cylinders going in and out now....it may be diff for the vette, but for the camaro, gas mpg is the same with or without it.


Between cyl deactivation ans start stop , I'll take SS Any day, having spent time with both....

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Old 09-04-2013, 06:16 PM   #5
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Start/stop is really a non-issue. Malibu has it standard now.
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Old 09-04-2013, 06:44 PM   #6
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Ah interesting info guys.
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Old 09-09-2013, 08:09 AM   #7
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How does Start Stop work if you live in a place like Florida where your AC is on all the time. Doesn't the engine have to be running for your AC to work?
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Old 09-09-2013, 12:42 PM   #8
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Quote:
Originally Posted by Salameth View Post
How does Start Stop work if you live in a place like Florida where your AC is on all the time. Doesn't the engine have to be running for your AC to work?
If the temp inside the car is higher than what you have set, it stays on. If you are at the temp you set, it will stop, but auto start again if the temp starts to rise. They have thought this out and it works fine. 25 parameters have to be met on a BMW before it will shut off, more than you can think of...
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