Advantages in going up spur gear size?

[kaladeth]

What are the advantages (if any) in going 21/50 instead of 19/46 on pinion/spur gear size? I've been running a 46 spur and it seems to work fine for me. But the Limitless stock mount can take a max of 50.

Will running a 50 be less work for the motor, and hence less potential for heat issues? Since the gearing ratio is the same, it's identical RPMs and maximum speeds, so I didn’t think it would have any effect on heat.

Will it result in faster acceleration?

It does let you run this ratio with a stock motor mount, vs. having to get a custom/upgraded motor mount that is required to allow smaller pinion / total toothcount.

 

[rotauq]

I like your excel sheet

No, as you can see all figures remain the same. Only difference is the range of pinions that will fit.
You already use GP5 diffs, that change made the drive shaft RPM lower, changing the spur size won't have such an effect imho

 

[NitroK]

They cancel each other out. Ratios are 2.381 and 2.421 respectively, 1.68% difference.

Large pinion, small spur...feel the power (and heat)

 

[Jchammbone]

I will add to the above... in some instances a bigger spur will allow the motor location to move to give you freedom to run a bigger motor can size than stock, and the opposite can happen going to smaller spur you sometimes need the bigger pinion to maintain proper gear mesh because of the limitations of the motor mount not allowing the motor shaft ample room to slide close enough for proper alignment.
##.... May not be the same for all makes and models....##