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Old 10-14-2010, 07:47 PM   #1
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Default what is the optimal speed for a truggy

good day everyone!

i have a ofna hyper st pro that is currently in the process of being converted to brushless.

the components i used are as follows:
hobbywing 2000kv motor
hobbywing xerun 150a esc
turnigy 4s1p 5000mah
hobbypro hyper 8 conversion (this needs a bit of modification to use it in the truck)

i wanted to know the optimal speed for a racing truggy since i want to buy the appropriate pinion for it.


thanx
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Old 10-14-2010, 07:54 PM   #2
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Hey there...not sure if this will help, but I ran my RC8BE at a fairly large track the past weekend, and it has a long straight away. With the gearing I had, I was running at about 44 mph (According to gearing calculator), and was slightly slower on the straight away than some of the faster guys. However, on the track as a whole, it did well. (This was in a buggy) I'd say anywhere in the 45-50mph range would be a good "speed" to gear for. Just make sure you take temperatures into account also!
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Old 10-15-2010, 08:14 AM   #3
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Default thanx

thanx Tyler350 for the swift reply

according to the speed calculator, i should be looking at a fairly large pinion 18 or 19 to get to that sweet spot. thanx again
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Old 10-15-2010, 08:44 AM   #4
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You don't need to gear much more than 35 mph for most tracks. 99% of tracks won't have a straight away long enough to get up to 45 mph.

You basically want to be able to grab full throttle and hold it for maybe 1 second on the longest straight.

I will guarantee that if you are geared for 45mph you will never see full throttle. At most gear for 38-40mph. Even then you are still probably never going to get to full throttle unless you have a 200 foot straightaway.
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Old 10-15-2010, 09:07 AM   #5
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Quote:
Originally Posted by Edumakated View Post
You don't need to gear much more than 35 mph for most tracks. 99% of tracks won't have a straight away long enough to get up to 45 mph.

You basically want to be able to grab full throttle and hold it for maybe 1 second on the longest straight.

I will guarantee that if you are geared for 45mph you will never see full throttle. At most gear for 38-40mph. Even then you are still probably never going to get to full throttle unless you have a 200 foot straightaway.
+1 too everything Russ said here .

Another benefit of gearing a little slower is there will be less heat build up and the battery will last a little longer .
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Old 10-15-2010, 12:59 PM   #6
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Default thanx

i feel better if there is a larger margin of safety

i also like the sound of using 16t (39.16mph) compared to using a larger pinion coz i reccon that the larger pinion will create another problem since there is only a small clearance left even when im only installing a 12t pinion right now.

thanx for everyone who responded!

i appreciate all the help guys and if you have additional suggestion, im still open to them
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