(was) Re: For those Mk1 owners... (is) No wonder my speedometer is off!!!

[amalventano1@home.com (Allyn)]

    If it was just the wrong speedo face then it would do what you say. Wrong speedo entirely (i.e.
100 mph speedo instead of 85 mph speedo) would not change the reading. 85 would read 85 on both. All
speedos are calibrated for a specific input rotation speed being equal to a specific mph reading.
What may be incorrect is the speedo gear (where cable enters tranny, used to correct for different
final drive ratios), or your tire diameter could be different. From what you say it appears to be
15% fast. The rieger has the same problem, but opposite direction (indicated is 10% over actual
speed). I always have to correct for it (for example, top speed of the rieger is 143, not 157 as was
indicated at the time). It worked in my favor though, cause it made 5th a tad narrower, top speed
nearly perfectally matched peak horsepower output (6500 rpm) of my 16v. Thinking back, the rieger
kit has to be more aerodynamic. Theres no way a stock scirocco body would go that fast that easily
(no turbo or anything in the rieger of course).

Allyn Malventano, ETC(SS), USN
87 Rieger GTO Scirocco 16v (daily driver, 170k, rocco #6)
86 Kamei Twin 16V Turbo Scirocco GTX (shell donor ready to rock, still planning, rocco #7)
87 Jetta 8v Wolfsburg 2dr (daily driver, 260k, 0 rattles, original clutch, driveshafts, wheels :)


----- Original Message -----
From: "Nate Mellom" <bronson@inwave.com>
To: <UrGTI@aol.com>
Cc: <scirocco-L@scirocco.org>
Sent: Wednesday, February 06, 2002 5:05 PM
Subject: (was) Re: For those Mk1 owners... (is) No wonder my speedometer is off!!!


> Holy schnikies, now I know why my speedo is off......
> Ever since I've had the '81, it seems like I'm doing 10 mph (75 actual
> shows 85, etc) more that I really am, but only when the needle is past
> vertical, and 5mph off when it's between 0-vertical.  I have a 100mph
> speedo, can I now assume this is incorrect for my car??????
>
> Huh.  Who knew?
>
> Nate
> '81 (extra speedy)
> '84 (engine almost ready to go back in!!!!!)
>
>
>
>
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