Is the 2012 eight speed trasmission a mistake?

[jailer]

I hear you MS.... I think they are just referencing "no dipstick" although you can probably check it some way.

If it is "Sealed", but not for Life, then... is it sealed for a "portion" of it's life ??

How do you open it after the "portion" if it is "sealed" ?? You crack it apart ??

I'm joshing you , but you see my point.

 

[OldSpice]

The transmission (5 speed) in my last Mercedes E500 was sealed as was the engine. The computer check the oil level and transmission fluid's temp. My Vette also has a sealed transmission (6 speed). This is becoming more common. No dip sticks don't bother me any more.

I also have a tranny like this in my Ford Explorer they are both drained and filled from the bottom, there is a pipe about 3" high on the other side of the fill hole and a pump is required to fill the fluid. It is designed this way to prevent over filling because any excess fluid will drain to the level of the pipe opposite the fill hole.

 

[robthoke]

I hear you MS.... I think they are just referencing "no dipstick" although you can probably check it some way.

If it is "Sealed", but not for Life, then... is it sealed for a "portion" of it's life ??

How do you open it after the "portion" if it is "sealed" ?? You crack it apart ??

I'm joshing you , but you see my point.

You are right - I'm referring to not having a dipstick to check the fluid levels. Beyond that I'll let a qualified tech service it.

 

[OldSpice]

Originally Posted by chilly mac
Just crossed 800 miles, and only two items occur to me. One is the non-linear acceleration -- It's almost like there's a sort of hump coming out of first that it has to get over and then runs up into second more quickly than expected. This is only noticeable for me when coming up to speed very slowly from a stop -- If I gun it or anything resembling gunning it, I don't notice it. I wish there was something I could do about it -- Thought about raising the issue with my dealer but anticipate that they'll say that's the way the transmission is designed. (Any ideas from anyone?)

Although this was posted on another thread it sounds to me like a very good argument as to why Hyundai is planning to switch to the eight speed transmission

 

[msitter]

Rate of acceleration on V8 is a combination ecu mapping/electronic throttle. I think the 4.6 would seem quicker if the gas pedal was actually connected to the throttle body. I first noticed the uneven rate of acceleration with my 06 GTO. the car should have been a lot quicker than the Genesis but it did not feel but marginally quicker. It was 200lbs lighter, had 15 more hp and 70 ftlb more torque and a 6 spd manual but the throttle response was lazy. I think they map them this way to save driveline stress and increase fuel economy which is the main concern these days. It is a matter of your foot telling the computer to accelerate faster and the computer deciding how much faster. Lazy shifts are programmed into the ecu to give that seamless quality to the shifts. I can barely tell when the Genesis shifts unless I am at close to full throttle.

 

[VivienM]

The 2011 BMW 5-series only offers the 8-speed transmission on their
V-6 RWD model, the AWD models and V-8 only offer the 6-speed transmission.

What does BMW know that Hyundai does not

If I had to guess, their supplier(s) haven't released an 8 speed transmission that can take the V8's torque (or if they have, maybe they can't produce enough to supply all BMW models, so BMW is using it only on the 7 series?). And maybe the existing 8 speed design can't fit in the AWD-equipped car, or doesn't have the right things to drive the front wheels, and their supplier is working on a new version.

Go look at MB. The high-powered V12 cars all use 5-speed transmissions, while everything else uses the 7-speed, because the 5 speed exists in an insanely beefed up version that can take the 700lb-ft of torque of the twin-turbo V12s. And the 4matic cars stayed 5-speed for a few years because the 7-speed didn't fit...

One thing to note: BMW does not design their own auto transmissions. They've traditionally bought GM and ZF. ZF usually has 6/8/etc-speed transmissions out before GM... so it could even be that they've switched all their ZF orders to 8 speeds, but ZF isn't capable of supplying enough, so they're still using GM 6 speeds in some models.

(Interestingly, the rumoured Hyundai RWD 8 speed would be an in-house design, which is something I'll believe when I see it...)