2.73 vs 4.56 Gearing ????????
04-08-2004, 04:55 AM
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2.73 vs 4.56 Gearing ????????
Maybe this seems like a basic qyuestion but to be honers tI just don't know why it is a big V8 with a 4.56 rear gear would rev at 100,000 RPM at 100 miles an hour but a 4.56 in a 4 banger has no problem????????????????
04-08-2004, 07:20 AM
#2
Originally posted by ayelien
Maybe this seems like a basic qyuestion but to be honers tI just don't know why it is a big V8 with a 4.56 rear gear would rev at 100,000 RPM at 100 miles an hour but a 4.56 in a 4 banger has no problem????????????????
Maybe this seems like a basic qyuestion but to be honers tI just don't know why it is a big V8 with a 4.56 rear gear would rev at 100,000 RPM at 100 miles an hour but a 4.56 in a 4 banger has no problem????????????????
Second, where does this 2.73 thing come in?
04-08-2004, 09:03 AM
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2:73=mustang right? The gearing has a couple factors. The easy ones are tranny gears and motor rev limit. My Cobra with 4.10's was around (I can't remember) but I know the top speed was 155 maxed in 5th gear at 7krpm. This is if I remeber right.
04-08-2004, 09:04 AM
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To clarify, 100,000 rpm was just a retorical exageration.
On modern V8 cars 2.73 could be a typical rear end gear for decent milage. Perfomance gears fo V8s go from like 3.30 to 4.10. Most V8s with 4.10's are winding like crazy at the end of 1/4 mile. No way you could put a 4.56 in a daily driver with a V8 for highway fare. I have a MGB that I dropped a 350 in and it still has the stock 3.90 rear end That was no problem for the original 4 banger but now it's fast as hell out of the hole but revs way to high on the highway. Question is why? If the rear end gear ratio remains constant what difference does the engine make or is the transmisson or what?
On modern V8 cars 2.73 could be a typical rear end gear for decent milage. Perfomance gears fo V8s go from like 3.30 to 4.10. Most V8s with 4.10's are winding like crazy at the end of 1/4 mile. No way you could put a 4.56 in a daily driver with a V8 for highway fare. I have a MGB that I dropped a 350 in and it still has the stock 3.90 rear end That was no problem for the original 4 banger but now it's fast as hell out of the hole but revs way to high on the highway. Question is why? If the rear end gear ratio remains constant what difference does the engine make or is the transmisson or what?
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04-09-2004, 03:32 AM
#8
Originally posted by ayelien
Maybe this seems like a basic qyuestion but to be honers tI just don't know why it is a big V8 with a 4.56 rear gear would rev at 100,000 RPM at 100 miles an hour but a 4.56 in a 4 banger has no problem????????????????
Maybe this seems like a basic qyuestion but to be honers tI just don't know why it is a big V8 with a 4.56 rear gear would rev at 100,000 RPM at 100 miles an hour but a 4.56 in a 4 banger has no problem????????????????
usually a steeper gear will not wind out as much on a car like ours because of our long range of RPM's (9,000)
A mustang with 4.10 gears is like saying a s2000 with 4.56 (this is an example and may not be accurate)
A mustang with 4.10 gears will take off pretty good off the line because of its greater torque. If you put 4.56 on a mustang and being the case that they dont rev as much as the S, they will wind out as hell on the highway
and of course, tire size, gear ratios in trannies also affect this.
04-09-2004, 07:16 AM
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You can compare different transmission and differential ratios from many popular sports cars in this site. You can see the tire sizes as well and compare their speeds on each gear.
I suggest looking into the extremes such as the S2000 (low torque, high winding motor) and the Viper (high torque, low winding).
Gearing and Calculations
I suggest looking into the extremes such as the S2000 (low torque, high winding motor) and the Viper (high torque, low winding).
Gearing and Calculations
