TC Internal Ratio
12-04-2003, 05:27 AM
#17
Tech Addict
lower means the number to be lower...
In addition to what seaball said, I will add that in a belt driven car the linear speed of the belt also has an influence. Hence when X-Ray designed their low ratio pulleys, they did increase the number of teeth on the primary pulley and decrease it on the diff pulley.
By this they reduced the linear speed of the belt (compared to the whells turning the same speed with the "normal" pulleys) which is also good for acceleration but not that much for top end (as the speed of the belt increases the centrifugal force stretches it a bit and it frees the drive).
In addition to what seaball said, I will add that in a belt driven car the linear speed of the belt also has an influence. Hence when X-Ray designed their low ratio pulleys, they did increase the number of teeth on the primary pulley and decrease it on the diff pulley.
By this they reduced the linear speed of the belt (compared to the whells turning the same speed with the "normal" pulleys) which is also good for acceleration but not that much for top end (as the speed of the belt increases the centrifugal force stretches it a bit and it frees the drive).
12-08-2003, 12:08 AM
#18
Originally posted by Neil Rabara
That's a really good question Kenneth. Since the cars are geared the same for a particular motor, but have different internal drive ratios, in theory they should be the same. But since they are two completely different cars, one belted the other shaft, you will feel and notice a difference in performance. As far as the internal drive ratio specifically has a performance advantage or disadvantage, keep in mind the tire/wheel rotation compared to the motor's rotation. If the SD car has a IDR of 2.353, that means that the wheels are turning 2.353 rotations for every one rotation at the motor.
That's a really good question Kenneth. Since the cars are geared the same for a particular motor, but have different internal drive ratios, in theory they should be the same. But since they are two completely different cars, one belted the other shaft, you will feel and notice a difference in performance. As far as the internal drive ratio specifically has a performance advantage or disadvantage, keep in mind the tire/wheel rotation compared to the motor's rotation. If the SD car has a IDR of 2.353, that means that the wheels are turning 2.353 rotations for every one rotation at the motor.
12-08-2003, 08:00 AM
#21
So what's this post about ....I can only see a very good avatar.
12-12-2003, 11:35 AM
#22
Slotmachine is correct about the drag car wanting to climb a taller spur gear...he is also correct in his choice of avatars, but that is another story.
This discussion also seems very similar with the comparison of gear ratios with 64 and 48 pitch and with that I can tell you that a 4.0 to 1 with 48 pitch maybe the same with a 4 to 1 on 64 pitch, but the performance is much different...Just something to think about.
Mike
This discussion also seems very similar with the comparison of gear ratios with 64 and 48 pitch and with that I can tell you that a 4.0 to 1 with 48 pitch maybe the same with a 4 to 1 on 64 pitch, but the performance is much different...Just something to think about.
Mike
12-13-2003, 01:10 AM
#23
how is that different Michal?
and yeah that kind of avatars are very distracting...but i most certainly do NOT mind...lol
and yeah that kind of avatars are very distracting...but i most certainly do NOT mind...lol
12-13-2003, 02:41 AM
#24
Slotmachines last one was 10 times more distracting then the one he has now. 
As per the confusion,
INTERNAL = GEARBOX OR PULLEY RATIO (big/small)
External = SPUR/PINION
FDR = INTERNAL x EXTERNAL
As per the confusion,
INTERNAL = GEARBOX OR PULLEY RATIO (big/small)
External = SPUR/PINION
FDR = INTERNAL x EXTERNAL
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