So, the test didn't help defense? 'Pity. 'Hope it wasn't too bad. ;<)))))
Wilton
----- Original Message -----
From: "R A Bennell" <b...@mts.net>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Friday, June 04, 2010 5:11 PM
Subject: Re: [MBZ] speedos (was: Re: ISO a fix for lousy fuel economy in
aW123turbodiesel - with an incentive)
I had my 300D tested due to a speeding ticket issue and it was very
accurate even though old.
Randy
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com]on Behalf Of ernest breakfield
Sent: Friday, June 04, 2010 2:15 PM
To: Mercedes Discussion List
Subject: [MBZ] speedos (was: Re: ISO a fix for lousy fuel economy in a
W123turbodiesel - with an incentive)
heh,... i'm not sure i deserve that kind of credit; they just happen to
be local to me.
(i once had my J**p roller-tested there after a tire size change
since it's where the local LEOs go; it was surprising to me how while
the odo was fairly accurate the speedo was only accurate at one speed;
indicated high below that, and low above,... it doesn't seem that making
a speedo accurate is a mfr's major concern!)
cheers!
e
On 04/Jun/10 13:02, Rolf wrote:
Someone with more active brain cells than me. I do believe that is the
place.
-Rolf
On 06/04/2010 12:56 PM, ernest breakfield wrote:
Rolf,
would you by any chance be referring to Palo Alto Speedometer?
cheers!
e
On 04/Jun/10 06:08, Rolf wrote:
There is a reputable shop in Cali that adverts in the back of the
star IIRC. They specialize in VDO's (they all have the same issue).
A few others on the boards have mentioned it as well. Name escapes
me. I think its about $150 to have it refurbed, I would go that
route with a warranty over replacing it with questionable used parts
(says the guy whos gone through 3 85 speedos and is about to just
give up on the junkyard and fork over the moola). If you tear the
speedo apart the mechanism is, what I would consider to be, fairly
laughable. Is a wheel in a cup that spins arounds (either the cup or
the wheel is drven cant remember). I consistently found that the
odo, if working tends to be correct and the speedo is off (same as
your predicament). Right now I have a non working odo and a bouncing
but accurate speedo.
Once I get around to getting the VNT installed in my car and doing
my own electronic vane control I plan on adding in support for
electronic speedos ala w126/201/124 etc. They have their own issues
but are easy enough to find.
-Rolf
On 06/03/2010 02:56 PM, andrew strasfogel wrote:
CORRECTION: Should have written "OK - what is the takeaway message
from all
that learned discussion? Am I doomed to forever have an inaccurate
speedometer that reads too high (in mph and miles covered), or is
there hope
for an affordable fix?"
On Thu, Jun 3, 2010 at 2:50 PM, andrew
strasfogel<astrasfo...@gmail.com>wrote:
OK - what is the takeaway message from all that learned? Am I
doomed to
foreever have ain inaccurate speedometer that reads too high (in
mph and
miles covered), or is there hope?
On Thu, Jun 3, 2010 at 12:57 PM, Dillon, Meade M CIV
SPAWARSYSCEN-ATLANTIC,
53310<meade.m.dil...@navy.mil> wrote:
Sho'enuf, hat tip to Rolf (and Mitch). For a 123.133 the EPC
shows that
the speedo and the diff changed for '85, but no changes to the
transmission speedometer gears.
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rolf
Sent: Thursday, June 03, 2010 10:51 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] ISO a fix for lousy fuel economy in a W123
turbodiesel - with an incentive
I know for a fact that the speedo is matched to the rear diff and
not
the transmission alteast in the W123 chassis. Feel free to
research it.
-Rolf
On 06/03/2010 10:46 AM, Dillon, Meade M CIV
SPAWARSYSCEN-ATLANTIC, 53310
wrote:
I think that the issue is the drive gearing may be the same, but
the
gear which drives the speedometer (in the tail of the tranny)
varies
to match the differential.
The EPC can answer this question...
-Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rolf
Sent: Thursday, June 03, 2010 10:38 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] ISO a fix for lousy fuel economy in a W123
turbodiesel - with an incentive
That is pretty much correct. The speedo is based on the rear
diff not
the trans. The automatics are all the same (for the w123)
gearing and
all the four speeds end in 1:1 gearing. The manuals differ from
year
to year based on engine and reivisions.
-Rolf
On 06/03/2010 10:35 AM, Mitch Haley wrote:
Jim Cathey wrote:
No, I correct myself. The speedometer is attempting to measure
wheel
RPM, but it's tapped at the tranny tailshaft. The 85 tranny is
_expecting_ to have a lower tailshaft RPM for a given road speed,
and
so gears up the speedometer tap to make up for it.
You put that tranny in a car with a shorter rear end, and the
tailshaft RPM is higher than expected, and so is the speedometer
output.
I thought the MBZ way was to have the trannies all alike, and
match
the speedometer head to the differential gearing.
Mitch.
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