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Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 > |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 > |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 > |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 > |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 |
Re: REGEARING FROM 3.07 TO EITHER 3.73 OR 4.11
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 Some people have an addiction to drink... Some people have an addiction to drugs.... I just have an addiction to Jeeps and their accessories.... Here are a few pictures of my rig http://s217.photobucket.com/albums/cc222/99_wrangler |
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