RE: Mystery Solved! How to select the proper gearing for your electric RC!
Got this response from NOVAK Hello, Are the Super Maxx diffs the one's made by UE?? If so you simply add 3 teeth to the recomended pinion. If you want to "play it safe" add 2 teeth. That's it really. Those diffs end about "about" 3 teeth less on the pinion gear. Got this response from U.E. Rule of thumb is to add 3 to the pinion tooth count to compensate for the 7.5 diffs. To do this accurately you need to calculate each ratio as it goes thru the driveline. I'd do it in a spreadsheet if I were you. In case anyone else was wondering this would seem to support the post from Traxxas "A little Razer math: 1st - 2.77:1 2nd - 1.72:1 UE Spyder 6 Diff - 3.31:1 1st (including diffs) - 9.17:1 2nd (including diffs) - 5.69:1 You multiply those by the spur/pinion ratio to find the final drive ratio. (51/15 = 3.4) - Final drive ratio in 1st - 31.18:1 Final drive ratio in 2nd - 19.35:1 --> Per Novak, do not use" In which my set-up with 76/15 = 5.06 X 5.69 = 28.82 final (safe by Novaks standards)
Posted on: 6/28/2005 2:49 PM by Author "jdeez1" in the forum "RC Electric Off-Road Trucks, Buggies, Truggies and more"
http://www.rcuniverse.com/forum/fb.asp?m=3118200

RE: Mystery Solved! How to select the proper gearing for your electric RC!
I found this info and did the math" I've got UE diffs, 14 cells, and the strobe slipper and sprong A little Razer math: 1st - 2.77:1 2nd - 1.72:1 UE Spyder 6 Diff - 3.31:1 1st (including diffs) - 9.17:1 2nd (including diffs) - 5.69:1 You multiply those by the spur/pinion ratio to find the final drive ratio. If the above info is correct I found a 76 spur 15 pinion would yield a 28.829 : 1 final gear ratio...is this correct (keeping in mind i am using the Supermaxx diffs)? If it is, this pinion, (15) would be the largest While using the 76 spur. Correct?? Then I could only gear it with smaller pinions?
Posted on: 6/28/2005 2:35 PM by Author "jdeez1" in the forum "RC Electric Off-Road Trucks, Buggies, Truggies and more"
http://www.rcuniverse.com/forum/fb.asp?m=3118152

RE: Mystery Solved! How to select the proper gearing for your electric RC!
I am trying to use a Novak HV-Maxx motor with my E-maxx I want to use two 7 cell packs Novak recomends 70/12 or 76/13 spur/pinion with this setup so your "Final Gear Ratio" is no lower thatn 28.6 : 1 I cannot find the "Transmission Ratio" for second gear for this truck The other problem is I have Supermaxx 7.5 diffs Supermaxx says "These do lower your overall gear ratio, you will need to gear your truck up. Maxx R&P ratio is 2.85:1 7.5 R&P ratio is 3.31:1" So now I am very confused, and don't want to damage my Novak Anyone have and Idea how to figure out the transmission ratio so I can change it for the new diffs?
Posted on: 6/26/2005 11:42 PM by Author "jdeez1" in the forum "RC Electric Off-Road Trucks, Buggies, Truggies and more"
http://www.rcuniverse.com/forum/fb.asp?m=3112510