[W126 Coupe] Pulley Ratios

[Richard Hogarth]

Alternator pulley ratio's are fairly standard at 3:1 , or very nearly that
for eg: 2.8:1 and 3.2:1. Close enough to give accurate RPM within +  or -
50rpm if my quick math has not done tricks on me. 
-RH. 

-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Dan Landiss
Sent: Monday, August 29, 2005 11:18 AM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] G-Tech Accelerometer

Shayegan, Richard wrote:

>Well, this quotation is from a gtech support staffer on the gtech 
>forums "basically the RPMs rely on the "alternator ripple" that is 
>superimposed on the 12V DC."
>(http://www.gtechproforums.com/forums/showthread.php?t=899&highlight=rp
>m
>s)
>  
>
Ahh, so you would also have to program in the pulley ratio.

>They also mention it working based on an electronic rpm signal in 
>various parts of the owner's manual 
>http://www.gtechprosupport.com/support/manuals/RR4.0.pdf
>  
>
That section suggests a manual calibration procedure; that could replace the
pulley ratio idea.

I did note that the G-Techie was forthright about a few problems with the
system -- weak signal, noise, poor resolution. I suppose it's OK for a
cheapie, but I sure like our Race Technology DL-1 Data Logger!

--
Never argue with a dragon, for you are crunchy and taste good with ketchup.



The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.