Last post on Sep 07, 2011 at 7:13 PM
You are in the Buick Lucerne
What is this discussion about?
Buick Lucerne, Sedan
#678 of 2217 Re: A6 . . . . . Re: The 2006 Buick Lucerne [imidazol97]
Jan 18, 2006 (9:26 am)
Perhaps we should return to the days of the powerglide with one planetary gearset. The question of failure rates depend on how well the transmission is engineered and built. I see no reason to expect it to have more problems.
The northstar automatic has a 2.96:1 first gear, and a 0.68 overdrive. The overall ratio is 2.96/.68 = 4.35:1. The gear ratio averages about 1.63 from higher to lower gears. The six speed automatics are designed with an overall ratio of 6:1 or about 1.43 per gear. So the gears are closer together. Basically this means that shifting down will speed up the engine from 2000 rpms in the 4 speed to 3200 rpms while in the six speed it will go to 2800 rpms. In reality, the gears are not spaced evenly.
#679 of 2217 Re: A4 A6 [rayainsw]
Jan 18, 2006 (10:00 am)
What I meant by 3rd being good to 50 MPH was that my Seville in 3rd gear will cruise 50 MPH at 2000 RPMs, which is a fairly reasonable speed for the engine. Above 50 MPH overdrive will be more fuel efficient. But I find that on hilly/mountinous roads with 50 MPH the speed limit, running in 3rd gear is better than letting the transmission try to use overdrive.
#680 of 2217 Re: A4 A6 [sls002]
Jan 18, 2006 (10:21 am)
“running in 3rd gear is better than letting the transmission try to use overdrive.”
As I recall, the previous (FWD) SLS & STS did not offer manumatic control of the A4 trans., so that does make sense.
One thing (of many) that I enjoy and utilize almost always is the ability to exercise some additional control over the automatic trans. shift \ don’t shift algorithms. It seems that many people do not understand that a true manumatic will allow much, much more control than simply placing a ‘normal’ automatic in third or second gear, which (typically) only locks out the gears above the one selected.
I will need to drive a V8 Lucerne at some point – one reason is that (though I have read the brochure) I am not sure exactly how much control they have engineered into this manumatic as they have implemented it in the Lucerne.
(Trans.) control freak . .
#681 of 2217 Re: A4 A6 [rayainsw]
Jan 18, 2006 (10:42 am)
I don't think that the Lucerne's 4T80 transmission has a manumatic mode. It should be the same transmission that I have on my 2002 Seville.
The Corvette's six speed automatic (same as Cadillac's STS_V automatic) has the following gears: 4.02:1, 2.36:1, 1.53:1, 1.15:1, 0.85:1 and 0.67:1. So the top three gears are close together. Third gear is also close to 4th actually. My Seville has the same top gear nearly at 0.68:1, but then 3rd is 1:1 and 2nd is 1.63:1. So, my 3rd is between the six speeds 4th and 5th gears, while my 2nd is a lower gear than the six speeds 3rd, although both of these gears are passing gears. On the six speed, with a 2.93:1 axle ratio, 2nd gear will go to about 65 MPH at an engine speed of about 6000 RPM's, making this gear a lower speed passing gear.
#682 of 2217 Re: A4 A6 [rayainsw]
Jan 20, 2006 (4:30 am)
Great A6 A4 discussion! Very informative. I'm convinced! I'll be in my Bonneville GXP for another couple years. A Lucerne V8 is on my radar. Hopefully by then it will have an A5 or A6. Better yet an A6 GS!
#683 of 2217 Re: A4 A6 [bunky36]
Jan 20, 2006 (7:23 am)
GM is going with six speed automatics in future vehicles. The current 5 speed automatics in the CTS, SRX, XLR and STS will probably not be used in other cars. I am not sure what 5 speed they plan for the Solstice/Sky. The question on what happens with the DTS/Lucerne depends on a number of things. If the FWD northstar powertrains are updated with a new transmission, it would probably be a six speed.
#684 of 2217 Lucerne Order
Jan 21, 2006 (4:42 pm)
After no hits with dealer searches for what we want, we ordered a Lucerne this past week. The dealer was pretty vague about when we might expect it.
I thought that a retail sold car would have a fairly high priority but the impression he gave was that this is not true for cars like the Lucerne that are in demand. I got the impression from him that the priority is getting cars to the dealers - not on pre sold cars. Anyone out there who knows how it works or has had experience in ordering a Lucerne?
#685 of 2217 Re: Lucerne Order [keith3]
Jan 21, 2006 (5:12 pm)
I think that a sold order will have priority over dealer orders. However, your order will be in line after other orders before yours. Your dealer should be able to monitor the status of your order.
#686 of 2217 Re: Lucerne Order [keith3]
Jan 21, 2006 (7:23 pm)
So, what did you order?
#687 of 2217 Re: Lucerne Order [rake2]
Jan 21, 2006 (8:46 pm)
Nothing special - 5 Passenger, CXL6, Lux. Pack, Ent. Pack, Conv. Pack. Problem was the 5 Passenger - everything within reasonable range of dealers here was 6 Passenger.