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Date:         Tue, 11 Feb 2014 12:01:53 -0600
Reply-To:     Ralph Meyermann <ralphmeyermann@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Ralph Meyermann <ralphmeyermann@GMAIL.COM>
Subject:      Re: Silly idea?
Comments: To: mark drillock <mdrillock@cox.net>
In-Reply-To:  <52FA1D7A.9010504@cox.net>
Content-Type: text/plain; charset=ISO-8859-1

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 >>>>>>> >>>>>>> >>>>>>> >>>> >> >>


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