Thinking about stock tires?
03-18-2005, 07:12 AM
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Thinking about stock tires?
I am thinking about going back to the stock tires. I purchased my truck with 315's. With 3:55 gears I am lugging it so bad in slow driving. I tach 1900 at 70, so when I am going 55-60 the RPM's are not in the sweet spot. I think this has contributed to premature tranny failure twice.
Do you think my driving will inprove with this. I know that I will probably lose MPG. This also creates a little problem towing. I have to disable OD almost always unless I am do about 75mph.
Any thought to this. I wish I had the 4:10 with the auto tranny. Also...I have never calibrated the speedo. This should put back where I need it to be. Will I realize a significant power increase off the line doing this? What do stock 245's tach at?
Brian
Do you think my driving will inprove with this. I know that I will probably lose MPG. This also creates a little problem towing. I have to disable OD almost always unless I am do about 75mph.
Any thought to this. I wish I had the 4:10 with the auto tranny. Also...I have never calibrated the speedo. This should put back where I need it to be. Will I realize a significant power increase off the line doing this? What do stock 245's tach at?
Brian
03-18-2005, 07:52 AM
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If your tach reads 1900 rpms at 70 mph your speedo has been recalibrated.
My opinion is if someone is going to put on tall tires or tow heavy the 4:10's are the only way to go. 4:10's will probably get you better fuel mileage due to not over taxing fuel verses rpm's verses hp to keep or get things rolling. Just my opinion.
My opinion is if someone is going to put on tall tires or tow heavy the 4:10's are the only way to go. 4:10's will probably get you better fuel mileage due to not over taxing fuel verses rpm's verses hp to keep or get things rolling. Just my opinion.
03-18-2005, 02:16 PM
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I meant earlier that I am doing 1900 rpm close to 80mph. When I am doing 70, I am really doing 80 with 315's. What do stock tires tach with 3:55's?
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03-22-2005, 08:21 AM
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Was the Lose real
Originally posted by Dennis
With the price of fuel, I just put another set of 265s back on. I had 285 goodyear MTRs and lost 1.5 -2.5 mpg. I have a 2001 4x4 with an auto and 3.55 gears.
With the price of fuel, I just put another set of 265s back on. I had 285 goodyear MTRs and lost 1.5 -2.5 mpg. I have a 2001 4x4 with an auto and 3.55 gears.
03-22-2005, 12:37 PM
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If you do the math, I think you will find the difference between 265's and 285's is 3.5%
With 285's (on a truck that came with 265's)...indicating 67.5 mph, you will be going 70 mph.
RJ
With 285's (on a truck that came with 265's)...indicating 67.5 mph, you will be going 70 mph.
RJ
03-22-2005, 05:35 PM
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Tread pattern and width do also affect mileage. Wide tire more rolling resistance, agressive tread more rolling resistance, wide agressive tread tire lots more resistance.
03-22-2005, 11:01 PM
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Get 245/75's, 265/75's or 235/85's. All of these will be better for towing by raising the RPMs. Also they might be better fuel economy because they're lighter, less rotating mass.
03-23-2005, 09:17 AM
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I get about 18mpg with my 315's. This of course is taking in the consideration that my odometer is not racking the miles like it used to. I add about 12% to the odometer reading, then calculate milege. I don't know the exact precentage I am off, but I am 10mph off at 60mph so I figure that is 12- 13% off.
Do you really think I will get better mileage with 245/75's? I definitely agree it will improving my towing. Should raise my R's right were they need to be.
Brian
Do you really think I will get better mileage with 245/75's? I definitely agree it will improving my towing. Should raise my R's right were they need to be.
Brian
03-23-2005, 12:23 PM
#15
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Originally posted by blh1960
I get about 18mpg with my 315's.....I add about 12% to the odometer reading, then calculate milege.... I am 10mph off at 60mph so I figure that is 12- 13% off.
Brian
I get about 18mpg with my 315's.....I add about 12% to the odometer reading, then calculate milege.... I am 10mph off at 60mph so I figure that is 12- 13% off.
Brian
RJ