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Old Jan 25, 2007 | 07:46 AM
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From: glenburnie,md
Question Need a Tune ??

Just installed 3.73`s on my 00TA A4, do I need to take it to have it tuned or should I save the tune for later---- how off will my speedo be ?

thanx
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Old Jan 25, 2007 | 07:48 AM
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How would anyone know how off the speedo would be with 3.73's if we dont know what ratio you had prior?
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Old Jan 25, 2007 | 08:50 AM
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From: glenburnie,md
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I had 2.73`s thought u would know cause of the year of car and its an auto !
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Old Jan 25, 2007 | 10:26 AM
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Auto could be 2.73 or 3.23 Manuals only came with 3.42!

Now you already have three varibles of the equasion your MPH your old gears and your new gears you can find this out with simple algebra.

X = MPH
Y = OLD GEARS
Z = NEW GEARS

(X/Y)Z

60mph/2.73 = 22mph now multiply 22mph by 3.73 = 82

So if your car is traveling 60mph your spedometer will show you are doing 82mph

or you can simply divide 3.73 by 2.73 and that 1.36 now multiply any MPH you want to travel by 1.36 and thats what your spedo will show.

For example your car is doing 35mph (35 x 1.36) your spedometer will be showing 48

And when you go to sell the car and the odometer says you have 136,000 miles on the car it really only has 100,000



wonderful thing that algebra huh, and for those mathmeticly challenged someone actualy took the time to make an on-line chart for those who are too lazy to think. its like www.fboagears.com or something

Most places that tune offer packages where you can put in a cooler thermostat and they will change fan settings, adjust spedometer, and remove torque management for under $100, id say thats the way to go

good luck
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Old Jan 25, 2007 | 10:34 AM
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From: glenburnie,md
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my brain doesnt work that way i`ll just have it tuned
thanks for the explanation , thats why i come to this sight.
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Old Jan 25, 2007 | 10:53 AM
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i know waht you mean smokey i know what you mean.....
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