Need help with spur/pinion decision
 

hi guys, i hope you can help me out with this. I'm converting my Ofna Ravager/9.5 to brushless electric. i already bought a Quark Monster 125B and a Feigao 8xl. i'm planning on running 4s lipo. the thing i cant figure out is gearing. the 1/8th buggy has a center diff with steel spur/main gear. i'm planning on getting a couple pinion gear, 12t-16t. what should i do about the spur??? i've heard people suggesting replacing it with a weaker one just to have a wekness in the drivetrain. should i do this or can i still just run the all steel drivetrain?

oh yeah i'm also thinking about upgrading to the Torsen diffs.

any help would be greatly appreciated.

Using a plastic spur is not necessarily to provide a weak spot, it actually wears better. Plus, it's cheaper to replace if you do mess it up. Regular steel pinions are cheaper as well (and easier to get) than the needed hardened steel pinions.

However, when using steel on steel, make sure you have a perfect mesh your mount DOES NOT FLEX! This flexing is what eats up hardened pinions. And you do NEED to use hardened pinions on a steel spur. Not only are they hardened and wear better, the actual teeth a shaped differently.

Ideally, you'd want some sort of a slipper system to provide the "give" to protect the drivetrain. But really, a buggy/truggy drivetrain is quite robust already.

About the Torsen, I've heard people ONLY using them in the front. Otherwise, it just doesn't handle right. And, some have reported that they are not as tough as regular diffs, plus they are expensive. Personally, I would simply tune your regular diffs properly and let it go at that.

alright thanks for shining some light on the situation. no so confused anymore.

By the way, WELCOME if it has not already been said.

Yes, where are my manners! Welcome to the forums darkshadow587!

thanks alot guys, glad to be here!