78 Alfetta speedo reads 10% high - Alfa Romeo Bulletin Board & Forums
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post #1 of 18 (permalink) Old 04-28-2019, 12:08 PM Thread Starter
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78 Alfetta speedo reads 10% high

Verified with GPS. Are there different gears available for the transaxle? Mine is gear driven cable speedo of course.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
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post #2 of 18 (permalink) Old 04-28-2019, 12:31 PM
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I mean, you're kind of lucky it's that close? 5-10% is pretty reasonable for an older speedo.

I doubt you've got the wrong gears in your transaxle, most likely the speedo spring has just gotten weak over the years. You can verify by driving a mapped course and seeing how close the odometer is.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #3 of 18 (permalink) Old 04-28-2019, 01:27 PM Thread Starter
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Originally Posted by Gubi View Post
I mean, you're kind of lucky it's that close? 5-10% is pretty reasonable for an older speedo.

I doubt you've got the wrong gears in your transaxle, most likely the speedo spring has just gotten weak over the years. You can verify by driving a mapped course and seeing how close the odometer is.

LOL. I feel much better now. Thanks.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
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post #4 of 18 (permalink) Old 04-28-2019, 02:24 PM
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Get a speedo repairer to adjust it by 10 % by removing and replacing needle.
Might not be accurate at all speeds,,but will be at the speed you specify.
Don't try it yourself cause its spring loaded and you will wreck it completely.

1972 105 GT Veloce 2000
1976 2L Spider
1984 GTV 6 3 litre
1967 GSGT 2 litre
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post #5 of 18 (permalink) Old 04-28-2019, 06:13 PM
Del
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Hah, back in the day, we always laughed and said that it was standard for Italian cars, as the government there wanted you thinking you were going faster than you really were.

Del

Seattle

1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
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post #6 of 18 (permalink) Old 04-28-2019, 07:02 PM
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The weight of the pointer influences the accuracy. Some Alfetta and GTV6 gauges had warped pointers and were trimmed so that they do not scrape against the dial. This causes them to read high.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #7 of 18 (permalink) Old 04-28-2019, 07:12 PM
Del
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Well, maybe, but almost all of the Alfas we and our friends had read a little high, maybe 5-10%. Even when they were new in those days. I was there. Nothing new at all. Old hat. Thus the old saying, lol.

Needles seemed to have nothing to do with it through the years. If anything, for normal driving the long part and thus the weight of the needle would have been on the left side of the speedometer (80 mph is often/usually being straight up on the dial), thus if anything reading low. Didn't drive much with the needle on the right hand side. Now, if the needle was shortened by someone, then maybe, but we never did that in our Alfas. Never had problems with bent needles.

Del

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1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6

Last edited by Del; 04-28-2019 at 08:31 PM.
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post #8 of 18 (permalink) Old 04-28-2019, 07:30 PM Thread Starter
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Originally Posted by alfaparticle View Post
The weight of the pointer influences the accuracy. Some Alfetta and GTV6 gauges had warped pointers and were trimmed so that they do not scrape against the dial. This causes them to read high.
Ed, you might be on to something. My speedo and tach both have shorter needles than I thought they should. Neither extends all the way into the colored swept area on the dial.

Anyone have a photo of a stock gauge?

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #9 of 18 (permalink) Old 04-29-2019, 12:27 PM Thread Starter
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Ed, you might be on to something. My speedo and tach both have shorter needles than I thought they should. Neither extends all the way into the colored swept area on the dial.

Anyone have a photo of a stock gauge?
Here's a photo of my speedo. Needle look normal length?
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It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #10 of 18 (permalink) Old 04-29-2019, 12:32 PM
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Your pointer is truncated
It should almost touch the step in the dial.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #11 of 18 (permalink) Old 04-29-2019, 12:50 PM Thread Starter
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Originally Posted by alfaparticle View Post
Your pointer is truncated
It should almost touch the step in the dial.
Circumcized, eh?

Whaddya mean "the step"?

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #12 of 18 (permalink) Old 04-29-2019, 12:57 PM
Del
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Hmm, forgot about the weird/oddball speedo for the 78 Alfetta sedan like we had. Don't remember our 75, but I think it was normal in comparison. Still, other Alfas we owned with the same speedo error had more normal dial arrangements. Even our Fiat.

In your specific case, perhaps... But we always knew the error as normal in new cars of those days and before, from my 64 Sprint GT and on, including our 75 and 78 sedans, IIRC. I always adjusted our indicated speed up by about 5-6 mph, checked by mile markers, later GPS.

Del

Seattle

1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6

Last edited by Del; 04-29-2019 at 02:53 PM.
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post #13 of 18 (permalink) Old 04-29-2019, 03:37 PM
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I think that there is a circular step that is just inside the numbers on the dial. In any case the pointer should almost reach the numbers.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #14 of 18 (permalink) Old 04-29-2019, 05:53 PM
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10 % is too much. Hope you can solve... My Alfetta runs 1 mph high at 40 mph. I have adjusted to it My pointer was truncated many years ago.....very glad now...
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post #15 of 18 (permalink) Old 04-29-2019, 06:25 PM
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Slowcreek,
I can let you have some plastic pointer material to glue onto the stubs. The weight won't be exactly right but it should improve things.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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