Will Honea

c wrote:

> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>
> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
> were, and I quote "4.56 is as close as it gets to how it was stock". I
> was wrong because I had the wrong original tire size. But even at that
> my calculations are much closer than saying that 4.56 gears would be as
> close to stock as her original setup.
>

Only problem with your math is that your assumptions are off a little. The
tire circumference is accounted for but the mass distribution is off
significantly for power calculations - those 33's will take significantly
more power to accelerate (or to stop, for that matter - first hard stop
with stock brakes is a real eye-opener!) and they have way more exposed
surface area for drag. Both are significant when addressing highway
performance. A simple multiple will NOT restore the feel.

--
Will Honea

--
Posted via a free Usenet account from http://www.teranews.com

Carl S

To restore stock 'feel':

31" tires = 4.10 gears
32/33" tires = 4.56 gears
35" tires = 4.88 gears

Carl


"Will Honea" <whonea@yahoo.com> wrote in message
news:46f4786d$0$26389$88260bb3@free.teranews.com.. .
>c wrote:
>
>> OK, so her tires are 27.6" instead of 29". The same formula still
>> applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
>> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
>> were, and I quote "4.56 is as close as it gets to how it was stock". I
>> was wrong because I had the wrong original tire size. But even at that
>> my calculations are much closer than saying that 4.56 gears would be as
>> close to stock as her original setup.
>>
>
> Only problem with your math is that your assumptions are off a little.
> The
> tire circumference is accounted for but the mass distribution is off
> significantly for power calculations - those 33's will take significantly
> more power to accelerate (or to stop, for that matter - first hard stop
> with stock brakes is a real eye-opener!) and they have way more exposed
> surface area for drag. Both are significant when addressing highway
> performance. A simple multiple will NOT restore the feel.
>
> --
> Will Honea
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>

Carl S

To restore stock 'feel':

31" tires = 4.10 gears
32/33" tires = 4.56 gears
35" tires = 4.88 gears

Carl


"Will Honea" <whonea@yahoo.com> wrote in message
news:46f4786d$0$26389$88260bb3@free.teranews.com.. .
>c wrote:
>
>> OK, so her tires are 27.6" instead of 29". The same formula still
>> applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
>> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
>> were, and I quote "4.56 is as close as it gets to how it was stock". I
>> was wrong because I had the wrong original tire size. But even at that
>> my calculations are much closer than saying that 4.56 gears would be as
>> close to stock as her original setup.
>>
>
> Only problem with your math is that your assumptions are off a little.
> The
> tire circumference is accounted for but the mass distribution is off
> significantly for power calculations - those 33's will take significantly
> more power to accelerate (or to stop, for that matter - first hard stop
> with stock brakes is a real eye-opener!) and they have way more exposed
> surface area for drag. Both are significant when addressing highway
> performance. A simple multiple will NOT restore the feel.
>
> --
> Will Honea
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>

Carl S

To restore stock 'feel':

31" tires = 4.10 gears
32/33" tires = 4.56 gears
35" tires = 4.88 gears

Carl


"Will Honea" <whonea@yahoo.com> wrote in message
news:46f4786d$0$26389$88260bb3@free.teranews.com.. .
>c wrote:
>
>> OK, so her tires are 27.6" instead of 29". The same formula still
>> applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
>> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
>> were, and I quote "4.56 is as close as it gets to how it was stock". I
>> was wrong because I had the wrong original tire size. But even at that
>> my calculations are much closer than saying that 4.56 gears would be as
>> close to stock as her original setup.
>>
>
> Only problem with your math is that your assumptions are off a little.
> The
> tire circumference is accounted for but the mass distribution is off
> significantly for power calculations - those 33's will take significantly
> more power to accelerate (or to stop, for that matter - first hard stop
> with stock brakes is a real eye-opener!) and they have way more exposed
> surface area for drag. Both are significant when addressing highway
> performance. A simple multiple will NOT restore the feel.
>
> --
> Will Honea
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>

Carl S

To restore stock 'feel':

31" tires = 4.10 gears
32/33" tires = 4.56 gears
35" tires = 4.88 gears

Carl


"Will Honea" <whonea@yahoo.com> wrote in message
news:46f4786d$0$26389$88260bb3@free.teranews.com.. .
>c wrote:
>
>> OK, so her tires are 27.6" instead of 29". The same formula still
>> applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
>> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
>> were, and I quote "4.56 is as close as it gets to how it was stock". I
>> was wrong because I had the wrong original tire size. But even at that
>> my calculations are much closer than saying that 4.56 gears would be as
>> close to stock as her original setup.
>>
>
> Only problem with your math is that your assumptions are off a little.
> The
> tire circumference is accounted for but the mass distribution is off
> significantly for power calculations - those 33's will take significantly
> more power to accelerate (or to stop, for that matter - first hard stop
> with stock brakes is a real eye-opener!) and they have way more exposed
> surface area for drag. Both are significant when addressing highway
> performance. A simple multiple will NOT restore the feel.
>
> --
> Will Honea
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>

c

Will Honea wrote:
> c wrote:
>
>> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
>> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
>> were, and I quote "4.56 is as close as it gets to how it was stock". I
>> was wrong because I had the wrong original tire size. But even at that
>> my calculations are much closer than saying that 4.56 gears would be as
>> close to stock as her original setup.
>>
>
> Only problem with your math is that your assumptions are off a little. The
> tire circumference is accounted for but the mass distribution is off
> significantly for power calculations - those 33's will take significantly
> more power to accelerate (or to stop, for that matter - first hard stop
> with stock brakes is a real eye-opener!) and they have way more exposed
> surface area for drag. Both are significant when addressing highway
> performance. A simple multiple will NOT restore the feel.
>

I understand that. The RPM calculations are there simply so she will
know what to expect her engine to turn while she is on the highway. If
you read the rest of the posts, I did recommend 4.11 gears, which is
more then just compensating for the tires. Also, you will see that she
did ask if 3.73 or 4.11s were better. With gas prices what they are
these days, and her driving 70 miles per day, fuel economy is also a
concern. In her case, I don't think she is going to lose much mileage
though. What she loses will be from the increased tire weight and wind
drag more than the gear change. Like I said in another post, if her
engine is lugging while she's on the highway, the gears could even help
her mileage a bit compared to what she has now. If it were my vehicle, I
would use the 4.56 gears, but I don't drive much on the highway. She
probably needs to decide between the 4.11s and 4.56s. I didn't recall
anyone recommending the 3.73s.

Chris

c

Will Honea wrote:
> c wrote:
>
>> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
>> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
>> were, and I quote "4.56 is as close as it gets to how it was stock". I
>> was wrong because I had the wrong original tire size. But even at that
>> my calculations are much closer than saying that 4.56 gears would be as
>> close to stock as her original setup.
>>
>
> Only problem with your math is that your assumptions are off a little. The
> tire circumference is accounted for but the mass distribution is off
> significantly for power calculations - those 33's will take significantly
> more power to accelerate (or to stop, for that matter - first hard stop
> with stock brakes is a real eye-opener!) and they have way more exposed
> surface area for drag. Both are significant when addressing highway
> performance. A simple multiple will NOT restore the feel.
>

I understand that. The RPM calculations are there simply so she will
know what to expect her engine to turn while she is on the highway. If
you read the rest of the posts, I did recommend 4.11 gears, which is
more then just compensating for the tires. Also, you will see that she
did ask if 3.73 or 4.11s were better. With gas prices what they are
these days, and her driving 70 miles per day, fuel economy is also a
concern. In her case, I don't think she is going to lose much mileage
though. What she loses will be from the increased tire weight and wind
drag more than the gear change. Like I said in another post, if her
engine is lugging while she's on the highway, the gears could even help
her mileage a bit compared to what she has now. If it were my vehicle, I
would use the 4.56 gears, but I don't drive much on the highway. She
probably needs to decide between the 4.11s and 4.56s. I didn't recall
anyone recommending the 3.73s.

Chris

c

Will Honea wrote:
> c wrote:
>
>> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
>> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
>> were, and I quote "4.56 is as close as it gets to how it was stock". I
>> was wrong because I had the wrong original tire size. But even at that
>> my calculations are much closer than saying that 4.56 gears would be as
>> close to stock as her original setup.
>>
>
> Only problem with your math is that your assumptions are off a little. The
> tire circumference is accounted for but the mass distribution is off
> significantly for power calculations - those 33's will take significantly
> more power to accelerate (or to stop, for that matter - first hard stop
> with stock brakes is a real eye-opener!) and they have way more exposed
> surface area for drag. Both are significant when addressing highway
> performance. A simple multiple will NOT restore the feel.
>

I understand that. The RPM calculations are there simply so she will
know what to expect her engine to turn while she is on the highway. If
you read the rest of the posts, I did recommend 4.11 gears, which is
more then just compensating for the tires. Also, you will see that she
did ask if 3.73 or 4.11s were better. With gas prices what they are
these days, and her driving 70 miles per day, fuel economy is also a
concern. In her case, I don't think she is going to lose much mileage
though. What she loses will be from the increased tire weight and wind
drag more than the gear change. Like I said in another post, if her
engine is lugging while she's on the highway, the gears could even help
her mileage a bit compared to what she has now. If it were my vehicle, I
would use the 4.56 gears, but I don't drive much on the highway. She
probably needs to decide between the 4.11s and 4.56s. I didn't recall
anyone recommending the 3.73s.

Chris

c

Will Honea wrote:
> c wrote:
>
>> OK, so her tires are 27.6" instead of 29". The same formula still applies.
>>
>> 27.6" tires with 3.07 gears will turn the same RPM as 33" tires with
>> 3.67 gears. This is HARDLY the same as the 4.56 gears that Carl said
>> were, and I quote "4.56 is as close as it gets to how it was stock". I
>> was wrong because I had the wrong original tire size. But even at that
>> my calculations are much closer than saying that 4.56 gears would be as
>> close to stock as her original setup.
>>
>
> Only problem with your math is that your assumptions are off a little. The
> tire circumference is accounted for but the mass distribution is off
> significantly for power calculations - those 33's will take significantly
> more power to accelerate (or to stop, for that matter - first hard stop
> with stock brakes is a real eye-opener!) and they have way more exposed
> surface area for drag. Both are significant when addressing highway
> performance. A simple multiple will NOT restore the feel.
>

I understand that. The RPM calculations are there simply so she will
know what to expect her engine to turn while she is on the highway. If
you read the rest of the posts, I did recommend 4.11 gears, which is
more then just compensating for the tires. Also, you will see that she
did ask if 3.73 or 4.11s were better. With gas prices what they are
these days, and her driving 70 miles per day, fuel economy is also a
concern. In her case, I don't think she is going to lose much mileage
though. What she loses will be from the increased tire weight and wind
drag more than the gear change. Like I said in another post, if her
engine is lugging while she's on the highway, the gears could even help
her mileage a bit compared to what she has now. If it were my vehicle, I
would use the 4.56 gears, but I don't drive much on the highway. She
probably needs to decide between the 4.11s and 4.56s. I didn't recall
anyone recommending the 3.73s.

Chris

Jamie Mello

I Think I will put some 4.88 gears in. When I install my 35's






99 wrangler 31 inch good year mtr tires warn M8000 winch 2.5 lift
skyjacker shocks a lot of lights (winch,hood,bumper, wind shield) Even
more toys to come

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