04-25-2011, 01:00 PM
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#1
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Is there a tool to calculate how taller tires well affect final drive ratio?
I have seen and used a lot of great tire calculators to figure out tire/wheel size deminsions and how the speedometer will be affected. But I am curious as what a 265/65/18 tire size will do to the final drive ratio compared to the stock 265/60/18 size? I have heard people say they definitely notice a difference in acceleration with 275/65/18 (even people with V8's) so curious how much I would notice the smaller increase in size with a V8? Thanks.
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2006 Sport Edition 4x4 V8. -- Amber Colored Auto Dimming Mirror with Compass and Homelink, Hydrocarbon Filter Mod, Limited Wheels, 265/65/18 Firestone Destination A/T's
Auto Dimming Mirror Install.
http://www.toyota-4runner.org/4th-ge...-pictures.html
Last edited by 4RunnERD; 04-25-2011 at 02:20 PM.
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04-25-2011, 01:08 PM
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#2
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2003.5 4Runner Sport, V8, Galactic Gray, Cornfed 1" front & 3/4" rear, Bilstein 5100's, FJ Cruiser wheels, 265/70/17 Firestone AT's
2010 4Runner Trail, Magnetic Grey, PIAA horns, FJ TT coils/shocks, Daystar front pre-load spacers, 265/70/17 Firestone AT's
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04-25-2011, 01:32 PM
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#3
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Thanks for the link, although for me it is kind of confusing... asking for input of some numbers that I have know clue of.
Maybe I mis-prashed in my original post, perhaps "final drive ratio" isn't the right term, but here is what I trying to gauge...
Right now I believe my stock 4Runner has 373 gears. When I accelerate from a stop at a red light on a paved road I know how these gears with the stock tire size feels in terms on torque and the feel of acceleration.
If I increase to a 265/65/18 how much loss of torque and acceleration will I feel with that small increase and having a V8? What will that tire size essentially be making my gears? For example instead of feeling like I have 373's it will now feel more like my gears are ___ ???? Does this make sense?
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2006 Sport Edition 4x4 V8. -- Amber Colored Auto Dimming Mirror with Compass and Homelink, Hydrocarbon Filter Mod, Limited Wheels, 265/65/18 Firestone Destination A/T's
Auto Dimming Mirror Install.
http://www.toyota-4runner.org/4th-ge...-pictures.html
Last edited by 4RunnERD; 04-25-2011 at 01:37 PM.
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04-25-2011, 02:01 PM
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#4
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04-25-2011, 02:09 PM
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#5
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For simplicity, use the calc in my link above and plug in 32 for tire size, 3.73 diff ratio, transmission and transfer case ratios of 1, and 50 mph. Calculate. Now replace 32 with 31 tire size, clear out diff ratio field. Calculate.
Answer: 3.61
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2003.5 4Runner Sport, V8, Galactic Gray, Cornfed 1" front & 3/4" rear, Bilstein 5100's, FJ Cruiser wheels, 265/70/17 Firestone AT's
2010 4Runner Trail, Magnetic Grey, PIAA horns, FJ TT coils/shocks, Daystar front pre-load spacers, 265/70/17 Firestone AT's
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04-25-2011, 02:18 PM
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#6
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Quote:
Originally Posted by chaz
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First link worked great only had to input three thing which I knew the numbers of to get my answer.
For those of you curious if you bump up to 265/65/18 from 265/60/18 instead of maintaining 3.73 gearing you will now have the equivalent of 3.61's and you would need 3.86's to achieve the orignal gearing feel. Of course you would have to round up to the next actual size available.
__________________
2006 Sport Edition 4x4 V8. -- Amber Colored Auto Dimming Mirror with Compass and Homelink, Hydrocarbon Filter Mod, Limited Wheels, 265/65/18 Firestone Destination A/T's
Auto Dimming Mirror Install.
http://www.toyota-4runner.org/4th-ge...-pictures.html
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04-25-2011, 02:20 PM
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#7
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Quote:
Originally Posted by 4RBob
For simplicity, use the calc in my link above and plug in 32 for tire size, 3.73 diff ratio, transmission and transfer case ratios of 1, and 50 mph. Calculate. Now replace 32 with 31 tire size, clear out diff ratio field. Calculate.
Answer: 3.61
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Thanks, I appreciate it! I figured it out eventually, wasn't sure what numbers to plug in intially.
__________________
2006 Sport Edition 4x4 V8. -- Amber Colored Auto Dimming Mirror with Compass and Homelink, Hydrocarbon Filter Mod, Limited Wheels, 265/65/18 Firestone Destination A/T's
Auto Dimming Mirror Install.
http://www.toyota-4runner.org/4th-ge...-pictures.html
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04-25-2011, 02:39 PM
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#8
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Quote:
Originally Posted by 4RunnERD
Thanks, I appreciate it! I figured it out eventually, wasn't sure what numbers to plug in intially.
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The transfer case ratio is always going to be 1 unless you are in 4Lo. The transmission ratio depends on what gear you are in. If you were doing 65+mph, you'd probably want to plug in our OD ratio (I don't know what it is off the top of my head, but less than 1).
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2003.5 4Runner Sport, V8, Galactic Gray, Cornfed 1" front & 3/4" rear, Bilstein 5100's, FJ Cruiser wheels, 265/70/17 Firestone AT's
2010 4Runner Trail, Magnetic Grey, PIAA horns, FJ TT coils/shocks, Daystar front pre-load spacers, 265/70/17 Firestone AT's
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04-25-2011, 04:18 PM
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#9
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Join Date: Mar 2011
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Quote:
Originally Posted by 4RBob
The transfer case ratio is always going to be 1 unless you are in 4Lo. The transmission ratio depends on what gear you are in. If you were doing 65+mph, you'd probably want to plug in our OD ratio (I don't know what it is off the top of my head, but less than 1).
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Good to know. I noticed in your signature you have a V8 4th Gen with the taller Revo's. Were you able to notice a difference in in torque or acceleration while driving?
__________________
2006 Sport Edition 4x4 V8. -- Amber Colored Auto Dimming Mirror with Compass and Homelink, Hydrocarbon Filter Mod, Limited Wheels, 265/65/18 Firestone Destination A/T's
Auto Dimming Mirror Install.
http://www.toyota-4runner.org/4th-ge...-pictures.html
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04-25-2011, 04:25 PM
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#10
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Quote:
Originally Posted by 4RunnERD
Good to know. I noticed in your signature you have a V8 4th Gen with the taller Revo's. Were you able to notice a difference in in torque or acceleration while driving?
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It was so long ago I upsized, it's hard to remember. I think I remember "barely" noticing a difference, but the low end torque of the V8 is MORE than adequate to handle such a small difference in tire size.
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2003.5 4Runner Sport, V8, Galactic Gray, Cornfed 1" front & 3/4" rear, Bilstein 5100's, FJ Cruiser wheels, 265/70/17 Firestone AT's
2010 4Runner Trail, Magnetic Grey, PIAA horns, FJ TT coils/shocks, Daystar front pre-load spacers, 265/70/17 Firestone AT's
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