Re: DAmmit : Part II

["Peter Loron" <peterl@cnw.com>]

The 4% figure jives with what I've seen from using a GPS unit whiel driving.
At lower speeds, the difference is very small. At highway speeds, the spedo
will read 80, but the GPS consistently reads 76.

-Pete
-----Original Message-----
From: Ng, Kevin (NationsCredit) <kevin.ng@nationscredit.com>
To: jettaglx@igtc.com <jettaglx@igtc.com>
Date: Friday, September 04, 1998 11:48 AM
Subject: RE: DAmmit : Part II


>OK, I don't have any definitive proof of this, just passing along what I
>read--the MFA and speedo are reading from different sources. The MFA uses a
>sensor at the wheel (measures something like every 1/4 turn of the wheel),
>while the speedo takes its reading from an electronic sensor somewhere in
>the tranny area. Why the speedo sensor is located by the tranny is a
>complete mystery to me. Why VW uses two different sensor readings is a
>complete mystery to me. My only guess is that, like some other car
>maufacturers, VW intentionally makes the speedometer readings a little
high,
>just to avoid complaints. What I do know for sure is that there have been
>plenty of reports stating that the MFA is indeed accurate, showing your
true
>speed, while the speedo gauge is slow by about 4%. So, if Flyin's GLX was
>totally stock and indicated 144 mph, with the 4% error actual speed was
138.
>Still higher than the published top speed limiter though....
>
>Kevin Ng
>97 GLX Windsor Blue
>
>
>> -----Original Message-----
>> From: FlyinVR6 [SMTP:FlyinVR6@li.net]
>> Sent: Friday, September 04, 1998 4:16 PM
>> To: jettaglx@igtc.com
>> Subject: RE: DAmmit : Part II
>>
>> .....exactly the point.....i want to hear someone explain that.....
>>
>> >>What's wierd to me is if both the computer and the analog gauge are
>> reading from the same source and they're both electronic. Why aren't they
>> both calibrated to the same degree of accuracy? <<
>>
>> FlyinVR6
>> ICQ : 8994103
>> AIM : SwiftVR6
>> \X/ Real Drivers Wanted \X/
>> <http://members.aol.com/qwikvr6/index.html>
>>
>> -----Original Message-----
>> From: owner-jettaglx@igtc.com [mailto:owner-jettaglx@igtc.com]On
>> Behalf Of Sean E. Mulch
>> Sent: Friday, September 04, 1998 9:25 AM
>> To: jettaglx@igtc.com
>> Subject: Re: DAmmit : Part II
>>
>>
>> That's true it does sound funky!
>>
>> Consider this though. A few weeks ago I'm driving in a residential
>> area on a 25mph road. On a straight stretch of road. there's this radar
>> trailer. You know the kind that measures your speed and displays it on
>> this big screen that says: "You are going : x mph."
>>
>> Well I was doing about 35 mph and it displayed about 32 mph.
>>
>> Now that's funky!
>>
>> What's wierd to me is if both the computer and the analog gauge are
>> reading from the same source and they're both electronic. Why aren't they
>> both calibrated to the same degree of accuracy?
>>
>> FlyinVR6 wrote:
>>
>> It's hard for me to believe that there is that much of a
>> difference between the computer and the speedo needle. I'm thinking that
>> the computer is lower due to the fact that it is programmed to take the
>> average mph of your drive time. I know that you're thinking..."Well if
I'm
>> going a constant 70, then the computer average should be 70 too...."
>> Maybe, maybe not. If you closely watch your speedo during cruise control,
>> it does NOT stay at a constant speed. It will drop off 3-5mph every now
>> and then before the engine kicks in to maintain the proper setting. Also,
>> if u think about it......having 66 displayed on your computer while your
>> speedo is reading 70 is a huge difference at that speed. That means when
>> you're doing 35mph, you're actually doing 33mph. That's too big a margin
>> of error for me to believe with all the technology we have packed in our
>> cars these days. I don't know enough about the on-board diagnostics of
our
>> cars to give any technical info to support my idea, but it just sounds
too
>> funky to me.FlyinVR6
>> ICQ : 8994103
>> AIM : SwiftVR6
>> \X/ Real Drivers Wanted \X/
>> <http://members.aol.com/qwikvr6/index.html>
>>
>>
>>
>