3.357:1 compared to 3.692:1
10-09-2009, 07:38 PM
#2
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It should yes, I'd love to see someone try it out. It will hurt your mpg a bit while cruising on the highway though.
10-09-2009, 08:18 PM
#4
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sow they swap the 3.9 for a 4.12? i had a gs400 that comes with a 3.26 and installed a supra 3.76 lsd it ran 300rpm higher but gave me better off the line performance..
10-10-2009, 08:15 AM
#7
Basically, the higher the gear ratio, the faster your acceleration will be, but you will have worse MPG and lower top end.
If you have a lower gear ratio, you accelerate slower but get better MPG and higher top speed (also less stress on motor).
If you have a lower gear ratio, you accelerate slower but get better MPG and higher top speed (also less stress on motor).
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10-10-2009, 11:27 AM
#8
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the diff on a 5at and 7at have difrent ratios he 5at has the higher one for a 7at get a 6mt diff and swap them. I am trying to get the full housing so i dont have to mess with internals.
10-10-2009, 11:53 AM
#10
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10-10-2009, 12:28 PM
#11
That's not completely true. If you spend most of the time driving in town in stop and go traffic and not at speed like on a highway, lower* (higher numerically) gears can help your mpg. Basically, you have more leverage to get going.
Also, some engines run more efficent at certain rpms. Sometimes that rpm might be a little higher, it's just the way it is.
*One more note: when talking about differential gears, the higher the number numerically, the lower the gear. Don't ask me why, I didn't invent this stuff. A 4.10 gear is considered lower than a 3.55. I went from 3.90's to 4.56's in my truck and from a 2.89 to a 3.55 in my Mustang. The lower the gear, the lower the top speed.
Also, some engines run more efficent at certain rpms. Sometimes that rpm might be a little higher, it's just the way it is.
*One more note: when talking about differential gears, the higher the number numerically, the lower the gear. Don't ask me why, I didn't invent this stuff. A 4.10 gear is considered lower than a 3.55. I went from 3.90's to 4.56's in my truck and from a 2.89 to a 3.55 in my Mustang. The lower the gear, the lower the top speed.
10-10-2009, 01:12 PM
#12
That's not completely true. If you spend most of the time driving in town in stop and go traffic and not at speed like on a highway, lower* (higher numerically) gears can help your mpg. Basically, you have more leverage to get going.
Also, some engines run more efficent at certain rpms. Sometimes that rpm might be a little higher, it's just the way it is.
*One more note: when talking about differential gears, the higher the number numerically, the lower the gear. Don't ask me why, I didn't invent this stuff. A 4.10 gear is considered lower than a 3.55. I went from 3.90's to 4.56's in my truck and from a 2.89 to a 3.55 in my Mustang. The lower the gear, the lower the top speed.
Also, some engines run more efficent at certain rpms. Sometimes that rpm might be a little higher, it's just the way it is.
*One more note: when talking about differential gears, the higher the number numerically, the lower the gear. Don't ask me why, I didn't invent this stuff. A 4.10 gear is considered lower than a 3.55. I went from 3.90's to 4.56's in my truck and from a 2.89 to a 3.55 in my Mustang. The lower the gear, the lower the top speed.
As to why a higher number is a "lower" rear end gear, it is because the number assigned to the gear is the number of revolutions the input shaft (drive shaft) has to make to achieve one revolution of the output shaft(s), in this case the rear axle. So with a 3.90 gear ratio, the drive shaft must turn 3.90 times to make the wheels turn one complete revolution. In a 4.56, the shaft must turn 4.56 times to spin the rear wheels once. It's "lower" because you get a lesser amount of wheel revolutions per drive shaft revolution.
10-10-2009, 03:00 PM
#13
Well, I could sit and try to explain it all out but that's not going to happen (I'm simply not that smart). I see what logic you are trying to use but there's a flaw in it somewhere. I'm talking about stop and go traffic here, not sustained speed. The lower gears help get the car moving easier, plain and simple. Gears are a form of leverage and I'm sure you can use that in the physics somewhere. This is nothing new and not a theory.
10-10-2009, 06:10 PM
#14
Administrator
Well, I could sit and try to explain it all out but that's not going to happen (I'm simply not that smart). I see what logic you are trying to use but there's a flaw in it somewhere. I'm talking about stop and go traffic here, not sustained speed. The lower gears help get the car moving easier, plain and simple. Gears are a form of leverage and I'm sure you can use that in the physics somewhere. This is nothing new and not a theory.
10-10-2009, 06:40 PM
#15
Well, I could sit and try to explain it all out but that's not going to happen (I'm simply not that smart). I see what logic you are trying to use but there's a flaw in it somewhere. I'm talking about stop and go traffic here, not sustained speed. The lower gears help get the car moving easier, plain and simple. Gears are a form of leverage and I'm sure you can use that in the physics somewhere. This is nothing new and not a theory.
Whatever factor I am I am missing, please point me in the correct direction to discover it, because that will mean that I have labored all my life believing in a law of physics that is false. I can make you lots of money if you can disprove it and prove the opposite of what's considered to have been proven and accepted for hundreds of years.
