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Sedans Cadillac STS/STS-V Cadillac STS/STS-V: What's New for 2007?
1325 messages, Last post on Apr 08, 2009 at 7:01 AM
You are in the Cadillac STS/STS-V Forum. Your Hosts are pat & karens
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Replying to: bosshogg (Jul 12, 2005 10:20 am) |
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The new 07' Silverado/Sierra pics are finally out for the world to see. However, GM has FAILED to include the new automatic 6-speed tranny. They say they do not have enough on inventory to be offered just yet. This transmission has 2 over-drive gears. Which will help reduce engine demand/gas consumption. What tranny is in the 06' STS? Anyone know?
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I THINK I JUST ANSWERED MY STUPID QUESTION. DriveTrain 5-speed shiftable automatic transmission rear wheel drive
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Replying to: jerrymcshane1 (Jul 24, 2006 11:56 am) |
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Replying to: jerrymcshane1 (Jul 24, 2006 11:52 am)
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Replying to: sls002 (Jul 25, 2006 9:55 am) |
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Some additional thoughts on the transmissions. The old FWD STS had a 3.71:1 axle ratio while the SLS had a 3.11:1 ratio. The overdrive was a 0.68:1 ratio, which gave the base Seville a 26 MPG highway rating. The STS did not get a different rating for some time, but when the Pontiac Bonneville got the northstar with the 3.71:1 gears, it was rated at 24 MPG highway, and I think the STS, DTS were rated at 24 MPG highway too. What this means is that with the high performance gearing, the engine runs about 20% faster, resulting in 2 MPG less on the highway. The RWD V8 STS has a 2.73:1 base axle ratio, which is rated 26 MPG highway with the 5 speed automatic. The 0.75 overdrive ratio on the 5 speed give an overall final drive ratio of 2.05:1. The new six speed automatic has an overdrive ratio of 0.67:1. With the 3.23:1 axle ratio, the 6 speed has a final overall ratio of 2.16:1, very nearly the same as the 5 speed with the base gearing. Thus, one might expect the highway fuel economy with the 3.23:1 axle ratio to be about 26 MPG. The AWD should improve to, perhaps to 25 MPG highway. The 3.23:1 axle ratio runs the engine about 20% faster than the 2.73:1 axle ratio. With the 3.23:1 axle ratio and the six speed automatic, the overall low gear ratio is about 13:1, while the 5 speed low gear, with the 3.42:1 axle ratio was 11.7:1. So, with the new transmission, the 3.23:1 axle should produce about the same performance as the 5 speed automatic with the 3.42:1 axle ratio, but still provide better highway fuel economy. Performance with the 1SG package was not much better than the base gears in Car & Driver's testing. I have not seen a magazine test of the 1SF package. It seems to me that the new transmission should come with a new set of axle ratios. The 3.42:1 axle seemed to have way too much power in low gear as it was, however, my guess is that the 3.42:1 gearing was better for the European autobahn where speeds well over 100 MPG are legal.
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Replying to: sls002 (May 30, 2006 6:37 am) This is a huge bugaboo for me as well - it's been what, 4 freakin' years since the iPod got popular? And as an electrical engineer, believe me, this is the *easiest* possible modification they could make to the car. A cigarette lighter is more complicated. Very disappointing, but maybe they'll have it on the '07. |
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