According to Edmund's review of SLK32... - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 07-20-2001, 09:06 AM
Albert (Vancouver)
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
According to Edmund's review of SLK32...

SpeedShift in SLK32 will prevent upshifting in mid-corner. Does that mean in our SLK230/320 will upshift in mid-corner even we are in +/- mode?<br>
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 07-20-2001, 09:20 AM
Butch
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
Never experienced upshifts w/230 at fast apex or mid-corners. Gear held by tranny 'brain'!

post #3 of 13 (permalink) Old 07-20-2001, 09:40 AM
Brian
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
Big difference in how the SLK32 determines when to "hold"...

The SLK32's speedshift takes inputs from the ESP accelerometers, so the car literally knows when you're turning a corner.
Sponsored Links
Advertisement
 
post #4 of 13 (permalink) Old 07-20-2001, 10:40 AM
Don
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
Upshifts can always be prevented in the SLK230/320...

Just set the gear range selection to correspond to the actual gear that the automatic has engaged. The transmission will never upshift to a gear higher than top gear of the selected range.
post #5 of 13 (permalink) Old 07-20-2001, 11:19 AM
Albert (Vancouver)
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
So, that means I should..

shift down to a gear that match the auto trans current gear before entering a corner if I want to turn hard on it.
post #6 of 13 (permalink) Old 07-20-2001, 11:39 AM
Butch
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
Sort of, unless you soon hit redline then the cutoff causes a nasty head/neck jolt as a reminder....

...but if you're near redline during the turn anyway, the tranny computer will detent and not allow a downshift even if the stick is manually shifted to a lower gear! This tranny's brain is pretty slick in protecting against self-destruction caused by over-enthusiastic drivers!<br>
<br>
Sometimes, I mind the electronic intrusion but also realize I get to drive the SLK another day instead of heading to the dealer for costly repairs!
post #7 of 13 (permalink) Old 07-20-2001, 11:49 AM
Albert (Vancouver)
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
That's truth!

post #8 of 13 (permalink) Old 07-20-2001, 01:22 PM
Don
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
Not exactly...

First it is important to understand the distinction between the GEAR that the transmission has selected and the GEAR RANGE that the driver has selected. When gear range '4' is selected by the driver, the transmission control system will automatically shift up and down between 1st, 2nd, 3rd, and 4th depending upon conditions -- but will never shift above 4th gear. Similarly when gear range '3' is selected, the transmission will automatically shift between 1st, 2nd and 3rd gears and will never engage 4th or 5th.<br>
<br>
To prevent an upshift from the current gear, the driver needs to know which GEAR is actually engaged by the tranny and which GEAR RANGE has been selected. If the current gear is the top gear of the selected range, the driver should NOT attempt to change the gear range. If the current gear is below the TOP gear of the selected gear range, pull and briefly hold the shift lever to the left stop. <br>
<br>
It is useful to understand what happens when the shift lever is pulled left and HELD briefly: If the current gear and gear range match, the next lower gear range will be selected AND the transmission will downshift IF redline will NOT be exceeded; if downshifting will cause the engine to exceed redline then the current GEAR RANGE and GEAR will not change. If the engaged gear is not at the top of the current gear range, the gear range will adjust down until the current gear becomes the top gear of the range. For example if gear range ô4ö is selected and 2nd gear is engaged, pulling the shift lever left and holding briefly will select gear range ô2ö and prevent subsequent upshifts above 2nd gear.<br>
<br>
Beware that downshifts are always a possibility. So if the driver chooses to setup in a turn at only 3000 rpm and squeezes the throttle to the floor exiting the turn, the transmission will kickdown.<br>
<br>
All of the above discussion relates to the standard MB automatic. The AMG automatics are supposed to be a little different.
post #9 of 13 (permalink) Old 07-20-2001, 01:54 PM
Albert (Vancouver)
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
That's very clear. Thanks guys!

post #10 of 13 (permalink) Old 07-20-2001, 10:10 PM
Butch
Guest
 
Posts: n/a
Mentioned: Post(s)
Quoted: Post(s)
Don's explanation is true, but only for '00MY and up! '99MY and earlier don't have 'touchshift'!

Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R170 SLK-Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome