I would be happy being within 2-3 mph due to the many variables.

Velma 82 1.9L AAZ td westy
On Feb 11, 2014 6:54 AM, "mark drillock" <mdrillock@cox.net> wrote:

> If you are going to use a hunting rifle that always shoots high to the
> right it is useful to know that it does so even if you might also have
> to factor in range, wind, air density, etc. It is true that most people
> don't use the results of their gearing calculations for anything real
> and thus accuracy doesn't matter so much. But some people spend serious
> money on gearing and tire changes and they should at least be aware of
> the degree of known error before doing so based on flawed tools. In this
> case someone proposed that he could achieve the same gearing effect with
> a specific tire change rather than using a different tranny that had a
> specific gearing. He was pretty far off and I first proposed a program
> error as a possible cause. I don't know what the actual source of his
> error was and as I already said the difference is greater than that
> which could be readily explained by the common flaw of various programs.
> I don't see how any of the other possible factors you mentioned would
> have much to do with his specific case of comparing the effects of a
> tire change to an internal tranny case on the same vehicle being use the
> same way and under the same conditions. The fact that we can't know
> everything or factor in everything makes a pretty weak argument for
> ignoring the errors that are apparent on the face of it.
>
> Mark
>
> OlRivrRat wrote:
>
>>       I suppose that If one is indeed trying to acquire Exact info on the
>> Rev's/Mile of a specific Combo of Tires & Gears then using the TireSpecs
>> supplied by the Manufacturer would be the Ideal way to go ~ But in defense
>> of those that might only be trying to make a RelativeComparison between 2
>> or more Diff' TireSizes &or Tire&GearingCombos I would submit that Most if
>> not All the Calc's on the web are quite sufficient ~ Especially in cases
>> where the Manufacturer does not provide the necessary info which can & does
>> happen ~ Also ~ Considering the Fact that VehicleWeight, TirePressure,
>> VehicleSpeed/TireRotationSpeed, Vehicle Aerodynamics & Road Surface Type
>> & Temp & Condition all should factor in to the equation, Exactness could be
>> deemed a waste of effort ~
>>
>>
>>             ORR ~ DeanB
>>
>> On 10 Feb , 2014, at 1:02 PM, mark drillock wrote:
>>
>>  There are a lot of garbage calculators on the web.
>>>
>>> Tire companies tell you how many rev/mile their tires turn. That is the
>>> spec to use for calculating gearing. If your calculator used a raw tire
>>> size instead then it is probably garbage.
>>>
>>>
>>> BFG says their 195/75/14 tire is 815 rev/mile
>>> BFG says their 215/75/15 tire is 748 rev/mile
>>>
>>>
>>> Mark
>>>
>>>
>>>
>>>
>>> Ralph Meyermann wrote:
>>>
>>>> It was showing me that the only ratio difference of the two was the ring
>>>> and pinion. The tire size is 27.8 on the bfg and 25-26 on my 195/75/14?
>>>>
>>>> Velma 82 1.9L AAZ td westy
>>>> On Feb 10, 2014 1:17 PM, "Ralph Meyermann" <ralphmeyermann@gmail.com>
>>>> wrote:
>>>>
>>>>  I was using the transaxle ratio/tire size calculator thing to make my
>>>>> reference from. Is it not that accurate?
>>>>>
>>>>> Velma 82 1.9L AAZ td westy
>>>>> On Feb 10, 2014 1:14 PM, "mark drillock" <mdrillock@cox.net> wrote:
>>>>>
>>>>>  Stock DK tranny and 195/75/14 tires in 4th at 3500 is 65.6 mph
>>>>>>
>>>>>> Stock DZ tranny and 195/75/14 tires in 4th at 3500 is 51.4 mph
>>>>>>
>>>>>> Stock DZ tranny and 215/75/15 tires in 4th at 3500 is 56.1 mph
>>>>>>
>>>>>> Mark
>>>>>>
>>>>>>
>>>>>>
>>>>>> Ralph Meyermann wrote:
>>>>>>
>>>>>>  Hi Volks, I may have another silly idea. I am planning on having my
>>>>>>> diesel
>>>>>>> ratio transaxle rebuilt with a 1st and second ratio change to a 4.13
>>>>>>> and
>>>>>>> 2.25 if my memory is correct to aide pulling my small fishing boat
>>>>>>> out of
>>>>>>> the water. My silly idea is that with 215/75/15 bfg all terrains
>>>>>>> matched
>>>>>>> to
>>>>>>> my diesel ratio transaxle is about the same as my dk transaxle with
>>>>>>> my
>>>>>>> 195/75/14. I was thinking that when I'm bringing the boat camping I
>>>>>>> will
>>>>>>> run the 14" wheel package to take some load off the engine/transaxle
>>>>>>>  and
>>>>>>> when I am not bringing the boat Ill use the big wheel package to gain
>>>>>>> some
>>>>>>> hwy speed? It's so crazy, it just might work??
>>>>>>> Velma 82 1.9L AAZ td westy
>>>>>>>
>>>>>>>
>>>>>>>
>>>>
>>
>>