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How much of a power loss did you guys with 285's notice with stock gears and a v6? I can't decide. Any info would help. Like rpm's compared with 285's to stock.
Thanks
Thanks
It's more complicated than just adding the additional weight of the tires. It takes the engine a lot more effort to get those heavier tires rolling. Even after correcting for the tread length difference, he could notice a 2-3 mpg loss on top of that.obex26 said:I am currently on 275 75 tires and milage is right at 300 a tank. Doubt its going to change that much more with 285's. Think of it as adding on about 12 lbs to your current weight load at most
obex26 said:Mudferret, You are going to notice more of a loss in "performance" with the added weight of your toolbox and bumpers then you ever will with a change of 10 mm in revolution surface. The added physical weight of a human body or objects will decrease more of your performance then a height difference of 10 mm on your tires. If you were to take a person who weighs 140 lbs and place them in a vehicle which has a tire combo of 285 70 16 with stock wheels. And then take a person who weighs 180 lbs and place them in an identical vehicle with no changes other then the tire size of 275 70 16. I promise you the first combo wil have a better response to performance even with the larger tire. The loss of difference will always be an issue of weight versus size. Yes you could put the same size person in both vehicles and yes the second tire option will have an improved performance but then it will come down to one issue and that is the difference in weight of the tires. This will not affect your milege in a 2-3 per gallon stance. 10 mm of tire are going to reduce the distance of revolution somewhere near 43 feet shorter in the completion of 1 mile.
Say for example you have roughly what 6440 feet to equal a mile if you subtract the estimated 43 feet the mile has been reduced by speedometer calibration for the larger tire size it takes 6397 feet to equal the same mile it previously did with the smaller tire. So 6397 x 50 miles you are now covering the distance of 319850 feet which is equal to the original distance of 322000 feet. For a loss of 2150 feet of calibration.
So if 322000 feet equals 50 miles and you divide that by 18 miles to the gallon you are getting 17888 feet per mile. If you take take the estimate of 319850 feet which also equals 50 miles and divide it by 18 you now have 17770 feet. A difference of 118 feet per mile your overall loss is at most 9/10ths of a mile in per gallon.
Matt your shift points do not change unless of course you have modified your computer. The computer gets its speed reading from the sensor cable which is at the end of the transmission not the tires.![]()
obex26 said:Mudferret, You are going to notice more of a loss in "performance" with the added weight of your toolbox and bumpers then you ever will with a change of 10 mm in revolution surface. The added physical weight of a human body or objects will decrease more of your performance then a height difference of 10 mm on your tires. If you were to take a person who weighs 140 lbs and place them in a vehicle which has a tire combo of 285 70 16 with stock wheels. And then take a person who weighs 180 lbs and place them in an identical vehicle with no changes other then the tire size of 275 70 16. I promise you the first combo wil have a better response to performance even with the larger tire. The loss of difference will always be an issue of weight versus size. Yes you could put the same size person in both vehicles and yes the second tire option will have an improved performance but then it will come down to one issue and that is the difference in weight of the tires. This will not affect your milege in a 2-3 per gallon stance. 10 mm of tire are going to reduce the distance of revolution somewhere near 43 feet shorter in the completion of 1 mile.
Say for example you have roughly what 6440 feet to equal a mile if you subtract the estimated 43 feet the mile has been reduced by speedometer calibration for the larger tire size it takes 6397 feet to equal the same mile it previously did with the smaller tire. So 6397 x 50 miles you are now covering the distance of 319850 feet which is equal to the original distance of 322000 feet. For a loss of 2150 feet of calibration.
So if 322000 feet equals 50 miles and you divide that by 18 miles to the gallon you are getting 17888 feet per mile. If you take take the estimate of 319850 feet which also equals 50 miles and divide it by 18 you now have 17770 feet. A difference of 118 feet per mile your overall loss is at most 9/10ths of a mile in per gallon.
Matt your shift points do not change unless of course you have modified your computer. The computer gets its speed reading from the sensor cable which is at the end of the transmission not the tires.![]()
Toyota4ever said:I'm not buying it that there is not that much of a loss of power with 285's. Maybe if you are hammering it and at full throttle. I would hate to think that someone would go and drop down $1000-$1500 on new tires and wheels to find that--Oh there is a big difference in the way the truck performs. The larger diameter tire in addition to having a wider tire increasing rolling mass has to decrease performance. I have to believe that Toyota provides a truck with the optimum combination of power and fuel economy, and when you change from stock, it's not usually for the better. There just seems to be a lot of people, including me, that are going with 4.56 or 4.88 gears to get back a little of what was lost with going to larger tires 33 inches+. A big consideration I think if you are to be happy with your daily driver for a period of time. It only took me one week to be tired of not having the pick up without giving the truck a lot of gas pedal and a loss of 4-5 miles per gallon.
Toyota4ever said:I'm not buying it that there is not that much of a loss of power with 285's. Maybe if you are hammering it and at full throttle. I would hate to think that someone would go and drop down $1000-$1500 on new tires and wheels to find that--Oh there is a big difference in the way the truck performs. The larger diameter tire in addition to having a wider tire increasing rolling mass has to decrease performance. I have to believe that Toyota provides a truck with the optimum combination of power and fuel economy, and when you change from stock, it's not usually for the better. There just seems to be a lot of people, including me, that are going with 4.56 or 4.88 gears to get back a little of what was lost with going to larger tires 33 inches+. A big consideration I think if you are to be happy with your daily driver for a period of time. It only took me one week to be tired of not having the pick up without giving the truck a lot of gas pedal and a loss of 4-5 miles per gallon.
a lot will depend on the terrain you drive. At sea level and on flat ground you won't notice it that much. But, get on hills or towing/hauling and you'll really wonder where the power went.Toyota4x4man said:How much of a power loss did you guys with 285's notice with stock gears and a v6? I can't decide. Any info would help. Like rpm's compared with 285's to stock.
Thanks
troyota said:man you will love the s/c. what a power difference!