pinion for Losi XXX4?
11-11-2007, 08:53 AM
#1
pinion for Losi XXX4?
I am just putting this 4wd buggy together. I have ordered a gtb/6.5 combo for it.
Where should I start with on the pinion gear?
Thanks, Chas
Where should I start with on the pinion gear?
Thanks, Chas
11-21-2007, 10:17 AM
#3
it really depends on the spur? if it still has the stock size the 18 would be a good all around feel.
11-22-2007, 10:08 AM
#4
Your pinion will be determined by the final drive ratio (FDR) you are going to run. This is a calculation based on the pinion/spur gear ratio and the internal drive ratio of the car. In the case of the XXX-4, your internal drive ratio is 2.10.
The calculation for FDR will be spur divided by pinion times internal drive ratio, for example a 94T and 18T pinion in the Losi will give you a FDR of 11.
(94 spur ÷ 18 pinion) x 2.1 internal drive ratio = 10.966666666666666666666666666667 FDR.
Novak has a starting guide which uses the FDR HERE. Work with those FDRs and adjust to your liking.
There is more info a bit more specific to the XXX-4 in THIS NOVAK GUIDE as well.
Novak recommends a 16T-17T pinion with the 94T spur for a 6.5R so start there and you can probably get away with up to 3 teeth either direction.
The calculation for FDR will be spur divided by pinion times internal drive ratio, for example a 94T and 18T pinion in the Losi will give you a FDR of 11.
(94 spur ÷ 18 pinion) x 2.1 internal drive ratio = 10.966666666666666666666666666667 FDR.
Novak has a starting guide which uses the FDR HERE. Work with those FDRs and adjust to your liking.
There is more info a bit more specific to the XXX-4 in THIS NOVAK GUIDE as well.
Novak recommends a 16T-17T pinion with the 94T spur for a 6.5R so start there and you can probably get away with up to 3 teeth either direction.
11-22-2007, 10:37 AM
#5
thanks for the info, great help
chas
chas
11-22-2007, 11:25 AM
#6
Your pinion will be determined by the final drive ratio (FDR) you are going to run. This is a calculation based on the pinion/spur gear ratio and the internal drive ratio of the car. In the case of the XXX-4, your internal drive ratio is 2.10.
The calculation for FDR will be spur divided by pinion times internal drive ratio, for example a 94T and 18T pinion in the Losi will give you a FDR of 11.
(94 spur ÷ 18 pinion) x 2.1 internal drive ratio = 10.966666666666666666666666666667 FDR.
Novak has a starting guide which uses the FDR HERE. Work with those FDRs and adjust to your liking.
There is more info a bit more specific to the XXX-4 in THIS NOVAK GUIDE as well.
Novak recommends a 16T-17T pinion with the 94T spur for a 6.5R so start there and you can probably get away with up to 3 teeth either direction.
The calculation for FDR will be spur divided by pinion times internal drive ratio, for example a 94T and 18T pinion in the Losi will give you a FDR of 11.
(94 spur ÷ 18 pinion) x 2.1 internal drive ratio = 10.966666666666666666666666666667 FDR.
Novak has a starting guide which uses the FDR HERE. Work with those FDRs and adjust to your liking.
There is more info a bit more specific to the XXX-4 in THIS NOVAK GUIDE as well.
Novak recommends a 16T-17T pinion with the 94T spur for a 6.5R so start there and you can probably get away with up to 3 teeth either direction.
In english, someone already suggested 17 or 18 to start but a math lesson in rollout/gear ratios is probably being absorbed by someone.
11-22-2007, 11:51 AM
#7
Sure - someone can tell him 18T but there are numerous factors that could make that 18T the wrong choice for him. Isn't he better served by giving him the tech behind the gear selections so that he is able to determine what works for him?
11-22-2007, 06:08 PM
#9
My point is not that you or anyone else is wrong. It is the fact that knowing how to calculate this stuff is worth more in the long run.
I am amazed that I actually have to sit here and defend myself for posting some actual valid and 100% applicable tech.
11-22-2007, 06:53 PM
#10
The easy answer isn't always the right answer. The site name is RC TECH, not RC Hold Your Hand.
Sure - someone can tell him 18T but there are numerous factors that could make that 18T the wrong choice for him. Isn't he better served by giving him the tech behind the gear selections so that he is able to determine what works for him?
Sure - someone can tell him 18T but there are numerous factors that could make that 18T the wrong choice for him. Isn't he better served by giving him the tech behind the gear selections so that he is able to determine what works for him?
Drew, you're giving me a headache.
What's the formula for Tylenol.
Just cuz you heard it and remembered it doesn't mean we all need to sit thru it.
Ever heard of TMI? Yeh too much information!
Now if he'd asked how should I figure out my own gearing you'd be right in there with the #1 answer I suppose.
11-22-2007, 07:35 PM
#14
So what you are saying is that he doesn't need to learn this stuff for himself, just listen to you because you have run on every track with every battery and every gear combination?
My point is not that you or anyone else is wrong. It is the fact that knowing how to calculate this stuff is worth more in the long run.
I am amazed that I actually have to sit here and defend myself for posting some actual valid and 100% applicable tech.
My point is not that you or anyone else is wrong. It is the fact that knowing how to calculate this stuff is worth more in the long run.
I am amazed that I actually have to sit here and defend myself for posting some actual valid and 100% applicable tech.
To be completely honest i didnt even read your posts in this thread, my post had nothing to do with trying to make you look less experienced or whatever.... really dude, settle down hey. You are going to have a fun time on this forum if you have a go at someone every time you post something and someone else puts there opinion right below it....
