R3 Model 0-100kph??
02-29-2008, 11:18 PM
#2
Hmmmmmm.........
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Reading up, roughly speaking
But wouldnt gearing make a difference?
Code:
weight of car in kilogrammes
time = ---------------------------------
maximum bhp of car * 0.9
02-29-2008, 11:46 PM
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Well the shorter gear ratio is supposed to make it accelerate faster but as far as 0-100 I have a feeling that there may be an extra gearchange to third before 100kph arrives,so faster acceleration but what 0-100??
03-02-2008, 02:26 AM
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Well the shorter gear ratio is supposed to make it accelerate faster but as far as 0-100 I have a feeling that there may be an extra gearchange to third before 100kph arrives,so faster acceleration but what 0-100??
If there's an extra gear-change needed, then the times (to 100kph) will be about 0.3sec slower just because of that.
If there's an extra gear-change needed, then the times (to 100kph) will be about 0.3sec slower just because of that.
03-02-2008, 03:01 AM
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Thats what I mean.The 0-100 may be slower but the overall acceleration will be faster is what I am thinking if you know what I mean. Keen to see some real specs and road tests..
03-02-2008, 05:32 AM
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03-02-2008, 03:09 PM
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Shootin' from the hip
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There is so much driver involvement in getting fast 0-100 times that for most people the times the journo's extract after several passes of stepping savagely off the clutch are just about meaningless - simple fact is that most people would never drive their cars that way. Far better to concentrate on power to weight ratios and torque figures IMHO.
03-02-2008, 07:01 PM
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I agree Dave but the sad reality is that bragging rights come from 0-100 times these days for people that dont know much about cars on the street. That is how they compare them and to be honest I have always been very impressed with my car especially the handling and braking and the way it does track days and then drives itself home, but I have always at the same time been disappointed in the off the mark acceleration. It is hard to tell people who havnt driven the car that the stig got the exact same time in an rx8 hot lap as he did in an m3 bmw..
03-02-2008, 07:56 PM
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Thats what I mean.The 0-100 may be slower but the overall acceleration will be faster is what I am thinking if you know what I mean.
Keep in mind that different/shorter final drive will make the car accelerate quicker as some speeds, and slower at other speeds. Though, generally speaking, it should make it quicker at lower speeds, and in particular in the 1st gear.
Example of how shorter gearing will make a car accelerate slower at some speeds, and quicker at others is ...
1. Take a car that has gearing where the 2nd gear would reach exactly 100kph, 3rd gear 150kph, and 4th gear 200kph. Let's call this CAR A.
2. Then take another car just like it, but make the gearing 10% shoter. Let's call this CAR B. It would have 2nd gear reaching 90kph, 3rd 135kph, and 4th 180kph.
3. Now if you measured the maximum/optimum acceleration for both CAR A and B, you would find that:
- CAR B would accelerate quicker below 90kph.
- CAR A would accelerate quicker between 90 and 100kph.
- CAR B would accelerate quicker between 100 and 135kph.
- CAR A would accelerate quicker between 135 and 150kph.
- CAR B would accelerate quicker between 150 and 180kph.
- CAR A would accelerate quicker over 180kph.
Keen to see some real specs and road tests.
Likewise.
Keep in mind that different/shorter final drive will make the car accelerate quicker as some speeds, and slower at other speeds. Though, generally speaking, it should make it quicker at lower speeds, and in particular in the 1st gear.
Example of how shorter gearing will make a car accelerate slower at some speeds, and quicker at others is ...
1. Take a car that has gearing where the 2nd gear would reach exactly 100kph, 3rd gear 150kph, and 4th gear 200kph. Let's call this CAR A.
2. Then take another car just like it, but make the gearing 10% shoter. Let's call this CAR B. It would have 2nd gear reaching 90kph, 3rd 135kph, and 4th 180kph.
3. Now if you measured the maximum/optimum acceleration for both CAR A and B, you would find that:
- CAR B would accelerate quicker below 90kph.
- CAR A would accelerate quicker between 90 and 100kph.
- CAR B would accelerate quicker between 100 and 135kph.
- CAR A would accelerate quicker between 135 and 150kph.
- CAR B would accelerate quicker between 150 and 180kph.
- CAR A would accelerate quicker over 180kph.
Keen to see some real specs and road tests.
Likewise.
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