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Old 03-15-2002, 02:24   #1 (permalink)
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Speedo Sender/Diff/Wheel Calculations

Hi guys,
I just wrote this quick Java App for a friend, to help calculate Speedo percentage errors, when changing Diff Ratios, and tyre profiles, etc etc.
I have also included calculations for the Speedo sender Gears, with the idea that people could play around with Different Wheel/Tyre/Diff Combinations, and try and work out what the speedo error is, and what Speed Sender Gear would be required to correct this error.

Anyway, the page is still being tested, but there are some things that I need help with.
1) Tyre profiles and Diff Ratios for different model Falcons (As per shipped from the factory)
2) Anyone with AU workshop manuals, I need information about speedo sender Colours and gearing.

When I get the Java stuff running nicely, I will submit this to DK for posting on the Australian ford forums site, but until then, does anyone have any idea's or suggestions ??

Cheers
Matt

P.S. here is the location of the page
http://www4.tpgi.com.au/users/mij/Au...peedoCalc.html
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Old 07-22-2004, 04:30   #2 (permalink)
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Re: Speedo Sender/Diff/Wheel Calculations

hi i have an AU III and i took it in to Ford as my Speedo was out by about 8km's they said it was a brocken tooth on the speedo gear but i thought these new car's all had electronic senders and were done away with the mechanical speedo gears so what are they reffering to??? Thanks
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Old 07-23-2004, 06:31   #3 (permalink)
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Re: Speedo Sender/Diff/Wheel Calculations

Quote:
Originally Posted by vbtruk
hi i have an AU III and i took it in to Ford as my Speedo was out by about 8km's they said it was a brocken tooth on the speedo gear but i thought these new car's all had electronic senders and were done away with the mechanical speedo gears so what are they reffering to??? Thanks
There is still a speedo gear. What they have now is :

Speedo gear @ box connected to an electronic sender.
The sender sends an electronic signal to the dash via wires (no cable anymore, more than likely pulses? Not sure)
Speed reads speed out on dash.

Brenden
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Old 07-23-2004, 09:24   #4 (permalink)
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Re: Speedo Sender/Diff/Wheel Calculations

You'll probably find its out by 8km/h at only one speed eg:108 @ 100 and 54 @ 50, they're normally out by a percentage. Is yours over or under?

It doesn't surprise me that its out. My last car read 105 when it was doing 100 (5% over read ie: 52.5 @ 50. Took it to the dealer to get fixed............"within factory limits" they say! I was told the limits were "over read" by 10% and "under read" by 5%.

I doubt it's a broken cog?? Most electronic speedos in the dash can be recalibrated by the turn of a built in screw.

Long term odometer results.......after only doing 70,000km my car actually showed 73,500!
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Old 07-23-2004, 15:19   #5 (permalink)
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Re: Speedo Sender/Diff/Wheel Calculations

yeah the ODO is a problem in that case, mine was under by about 8km's they said, at first i was told that it was a broken tooth and when i returned to have a look at the gear it was a 21 tooth and they told me a 22 tooth was needed in which case that's what they did to fix it.
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Old 07-24-2004, 22:13   #6 (permalink)
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Re: Speedo Sender/Diff/Wheel Calculations

OK AUII info I have is as follows:

AUII Wagon Forte, Futura, Fairmont Auto 6 & V8

Diff ratio 3.23:1 Tyres 215/60R16. Speedo drive gear 20 tooth Brown.

Factory Sports Suspension option 215/55R16, 16" wheel option 225/50R16, 17" wheel option 235/45R17

AUII Forte, futura Sedan Auto 6 Diff ratio 3.08
AUII Forte, futura Sedan Manual 6 Diff ratio 3.23
AUII Forte, futura Sedan Manual 6 IRS Option Diff ratio 3.45
AUII Forte, futura Sedan Auto 6 IRS Option Diff ratio 3.45
AUII Forte, futura Sedan Auto V8 Diff ratio 3.23

Fairmont Ghia VCT 6 Auto sedan Diff ratio 3.45 Speedo drive gear 21 tooth light green.
Fairmont Auto Sedan Auto diff ratio 3.23
Fairmont and Ghia V8 Auto diff ratio 3.23
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Old 07-29-2004, 03:48   #7 (permalink)
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Re: Speedo Sender/Diff/Wheel Calculations

Found this on ford-tech for AUI. Its not right for AUII and I can't agree about the 16" wheel statement.

ENGINE
TRANS.
AXLE

RATIO
DRIVING

GEAR

NO. OF

TEETH
DRIVING

GEAR

NO. OF

TEETH
DENT.

COLOUR

6 Cyl. Sedan

except LSD
Auto
3.08
8
20
Brown

8 Cyl., 6 Cyl.

sedan, wagon

& LSD
Auto

(& Manual)
3.23
8
21
Light Green

XR6
Auto

(& Manual)
3.45
8
22
Grey

XR8
Auto
3.45
8
22
Grey


Note: The fitment of the 16 wheel option does not significantly alter the output of the speedo
-
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Old 07-29-2004, 03:53   #8 (permalink)
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Re: Speedo Sender/Diff/Wheel Calculations

did anyone notice that original post was made in 15-03-2002, 19:24 ?
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