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Old 01-14-2011, 07:03 PM   #1
joe h
 
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2008 cobalt question

Bought an used 2008 cobalt sport with a 4 speed automatic, driving 75mph on the interstate the car is turning 2800rpms. Service departments I have talked to will give me figures ranging as low as 1900 to as high as 2600. So today I bring it to the dealership and of course the technician says nothing is wrong, could not find any codes. If this true, and the car is running right, this would be the highest any automatic, that I have owned, has turned since a 94 suburu with a 3 speed. and 200rpms higher than any 4 speed I have ever owned.

Just wondering if anyone has had any experience with this car, or similar car, that can confirm this car is running properly or not.
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Old 01-14-2011, 07:35 PM   #2
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My old Sunfire ran around 3k when at 70mph so that seems about right.
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Old 01-14-2011, 07:53 PM   #3
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maybe the gears were changed out?
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Old 01-14-2011, 08:36 PM   #4
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Sounds about right.
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Old 01-14-2011, 10:07 PM   #5
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In line with what my 2008 LS is doing. I rarely go above 65 because of it...exponential fuel-economy reductions hurt....
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Old 01-15-2011, 12:04 AM   #6
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Just seems strange that over the last 20 years gm has been gearing their overdrive lower, but this one car line they decided to go with nearly 3000 rpm. I have a 2008 impala that runs at 1900 at 75, even my old 96 cavalier with a 4 speed was around 2600.
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Old 01-15-2011, 12:08 AM   #7
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Quote:
Originally Posted by joe h View Post
Just seems strange that over the last 20 years gm has been gearing their overdrive lower, but this one car line they decided to go with nearly 3000 rpm. I have a 2008 impala that runs at 1900 at 75, even my old 96 cavalier with a 4 speed was around 2600.
It all depends on the engine output/weight of the vehicle, etc...The Camaro is hardly above idle at 55, and not much more than 1600 at 75, I think. But then, it also has a 6-speed with a deep overdrive in 6th...
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Old 01-15-2011, 01:01 AM   #8
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a little under 3000 rpm for a GM 4banger with a 4 speed hydramatic sounds about right
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Old 01-15-2011, 01:05 AM   #9
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Quote:
Originally Posted by joe h View Post
Just seems strange that over the last 20 years gm has been gearing their overdrive lower, but this one car line they decided to go with nearly 3000 rpm. I have a 2008 impala that runs at 1900 at 75, even my old 96 cavalier with a 4 speed was around 2600.
It should be the exact same as your Cavalier. Same transmission ratios, same overdrive. Only difference would be the OD of the wheels & tires.
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Old 01-15-2011, 09:03 AM   #10
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Try this. The inputs are readily available if not in the owers manual.

http://www.csgnetwork.com/multirpmcalc.html
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Old 01-15-2011, 10:28 PM   #11
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Yeah, that sounds right. My 2008 Cobalt Sport does the same about the same at that speed.
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Old 01-15-2011, 11:07 PM   #12
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Good to know, buying the car used I had some jitters, so anything slightly different had me concerned at first, but everything seems fine. Also didn't realize until a couple days ago it was suppose to take 91 octane, I was using 89 and that was most likely contributing to the lower than advertised gas mileage.
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Old 01-16-2011, 12:04 AM   #13
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Quote:
Originally Posted by joe h View Post
Good to know, buying the car used I had some jitters, so anything slightly different had me concerned at first, but everything seems fine. Also didn't realize until a couple days ago it was suppose to take 91 octane, I was using 89 and that was most likely contributing to the lower than advertised gas mileage.
wut? I didn't know that either.
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Old 01-16-2011, 12:24 AM   #14
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yep, it is buried in the manual. Also wikipedia lists the compression ratio as 10.4:1. But the car doesn't seem as finicky as the camaro.
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Old 01-16-2011, 12:40 AM   #15
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just got back home in the wifes 2006 2 dr. colbalt 21,xxx miles auto 4 spd. all stock with no mods and 2500 rpm's @ 70 mph with an average of 29.6 mpg. so it sounds right to me .
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