[W126 Coupe] 2.82 Rear Diff for 84 500SEC

[Jonathan]

Hello Alec,

Yes, ratio's are the same..some of the Euro 560's did come w/ a slightly 
more aggressive 1st gear though, but everything else stayed the same.  
They are all 1-1 in 4th.

Jonathan


Divov wrote:

> */Jonathan,/*

> */Are the gearbox ratios the same on a 500SEC & a 560SEC?/*

> *//* 

> */With my set-up (from a 2.24 going to a 3.27) I have roughly 

> calculated the following:/*

> */3500RPM  - 128km/h/*

> */4000            - 146/*

> */4500            - 165/*

> */5000            - 183/*

> */5500            - 201/*

> */6000            - 220/*

> *//* 

> */Alec D./*

>

>     ----- Original Message -----

>     *From:* Jonathan <mailto:jhodgman at gmail.com>

>     *To:* Mercedes Coupes Mailing Lists <mailto:mbcoupes at mbcoupes.com>

>     *Sent:* Sunday, July 22, 2007 7:58 PM

>     *Subject:* Re: [W126 Coupe] 2.82 Rear Diff for 84 500SEC

>

>     Interesting, as when driving around on a 2.82 I find the cars RPM

>     on the highway livable, but it makes me less inclined to want to

>     do serious highway driving.  I find the 2.82 makes a Large

>     difference over the stock 2.47 acceleration wise, very perceptible

>     IMHO, esp. when you have the opportunity to swap back and forth

>     from stock to modified.

>

>     Here are some plots using Dan's MPHvsRPM Excel chart:

>

>     http://blueridgemb.com/stockdiffrpm.jpg

>

>     http://blueridgemb.com/307diffrpm.jpg

>

>     Now if I could run Eddie's Gear Vendors or once we get the 5/6sp

>     conversion done I'll be all for a 3.07, or even 3.47:)

>

>     Jonathan

>

>

>     Gerry Van Zandt wrote:

>>     The 3.07 isn't all that bad in highway driving. At 80 MPH you're

>>     doing EXACTLY 3,500-3,550 RPM; at 65 it runs around 3,000 RPM. 

>>     Redline for a 560 is what, 6K or a little higher -- there's

>>     plenty of headroom.  I drive my 89 560SEC from Portland up to

>>     Seattle quite regularly (a 2.5 hour trip) and it's really not a

>>     problem.  

>>

>>     I'm still getting upwards of 15 MPG average per tankful.  The

>>     last tankful, all highway driving, was 17.59 MPG with the

>>     3.07.  16 and 17 MPG for tankfuls with all-freeway driving are

>>     not at all uncommon.

>>

>>     The benefit at low speeds and off the line far outweighs the

>>     engine running 700 RPM higher at 80 MPH, compared to a stock 2.47

>>     car.

>>

>>     An 84 500SEC or a 380SEC is a direct bolt-up for a 3.07 from a

>>     sedan. The later cars (560s) require some slight mods -- the 3.07

>>     gearset must be placed in a 560 pumpkin.  You do have to

>>     calibrate the speedo with an adjustment box.  Mine was about

>>     10-12 MPH off.  This is easy to do and you can tuck it behind the

>>     instrument cluster back in the dash.

>>

>>     A 2.82 is a good compromise in terms of ratio, but it's not

>>     enough of a difference, IMHO, to warrant the time and cost of

>>     doing a replacement.  The 3.07 is a large jump and the results

>>     are dramatic.  If one is doing the swap for better off the line

>>     quickness and such, I'd just go whole hog.  Those of us who have

>>     done the switch wouldn't go back.

>>

>>     Cheers,

>>     Gerry

>>

>>

>>

>>     On Jul 20, 2007, at 9:15 AM, mbcoupes-request at mbcoupes.com

>>     <mailto:mbcoupes-request at mbcoupes.com> wrote:

>>

>>>

>>>     As an aside, if you do a Lot of highway driving you might find

>>>     the 3.07

>>>

>>>     from a 450 a bit Busy...granted it will feel Great off the line

>>>     though!

>>>

>>>

>>>     Jonathan

>>>

>>>

>>

>>     ------------------------------------------------------------------------

>>

>>     The MB Coupes Website!

>>     W126 SEC Mailing List

>>     Postings remain property of MB Coupes, L.L.C.

>

>

>     -- 

>     Blue Ridge Mercedes

>     Offering Enthusiast Service, Restoration and Modification.

>     Providing quality parts to discriminating customers in all parts of the world.

>     Located in the Greater Atlanta area.

>     http://www.blueridgemb.com

>

>     1996 S600 Euro "Scharnhorst"

>     1991 560 SEC Full Euro ECE

>     1991 560 SEC 226Hp/271ft/lbs

>     1989 560 SEC AMG (N.A. Conversion 250/297)

>     1987 560 SEC 

>     1986 560 SEL 6.0L 32V AMG

>     1985 300 CD (for sale)

>     1980 280 SE Euro

>     1986 560 SEC (parts)

>         

>

>     ------------------------------------------------------------------------

>     The MB Coupes Website!

>     W126 SEC Mailing List

>     Postings remain property of MB Coupes, L.L.C.

>

> ------------------------------------------------------------------------

>

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.



-- 
Blue Ridge Mercedes
Offering Enthusiast Service, Restoration and Modification.
Providing quality parts to discriminating customers in all parts of the world.
Located in the Greater Atlanta area.
http://www.blueridgemb.com

1996 S600 Euro "Scharnhorst"
1991 560 SEC Full Euro ECE
1991 560 SEC 226Hp/271ft/lbs
1989 560 SEC AMG (N.A. Conversion 250/297)
1987 560 SEC 
1986 560 SEL 6.0L 32V AMG
1985 300 CD (for sale)
1980 280 SE Euro
1986 560 SEC (parts)

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