Savage Flux Gearing
 

Can anyone verify the gearing for me? It looks like this is what it has:

Diffs: 3.307 (43:13)
Tranny: 2.697 (44:18, 32:29)
Pinion/Spur: 20:44

Total Gear Ratio out of the box: 19.628:1

I have the tires at 6.3". Putting all that into the calculator gives me a speed on 4S of 31.09mph. That sounds a bit low, are my values correct?

Sounds low to me too. Probably closer to 15:1 I would bet. I may pick one up here soon, just trying to unload my emaxx first.

You may find that that is correct. If it was geared too tall when people put 6s in it they would fry the motor. It the tranny locked in first or second in the flux? Its first isn't it? In the 4s videos I have seen too it hasn't been that quick either.

It does sound low, but I verified the part numbers and tooth counts in two places:

http://s244.photobucket.com/albums/g...urrent=004.jpg

http://e-savage.com/forums/showthread.php?t=4316

On that calculator, assuming you are right, when you go to 6s power and 25t pinion it should be 62mph (claimed top speed) which it isn't (it's 58) so I would suggest something is out.

My Revo BL on 4s is calculated as 33mph right now and it's not even close in speed to a Flux on 4s

Did you account for tire growth... At 58mph those tires must be huge...

Looks like I will be locking my flm savvy in 2nd in order to use the 1521 2y... 2.697 for the tranny is too low for my uses.

Hi, I have the following:

Diffs @ 3.307 (43:13)
Trannny @ top drive gear to first idle gear 2.444 (44:18)
Trannny @ second idle gear to output gear 0.906 (29:32)
Spur-Pinion @ 2.200 (44: 20)

For a total ratio of 16.109

With 14.8v, 2200kv and 6.3" tire the math for that combo is ~37.9mph

Where our math differs is the second gearing stage of the tranny.
I see the 32T gear on the idle shaft driving the 29T gear on the output shaft. Which means it would only take the 32T gear 0.906 of a revolution to turn the 29T output gear one full revoultion.

Yep, you are correct. Unfortunately the information I originally found on another site was incorrect in that it had the 29 and 32T gears in the tranny backwards. Now that I actually have one and can see the manual, I see that the 29T is the output while the 32T is the idler.

Lol got to keep the front tyres down first to get to that speed!

In the xtreme rc magazine savage flux speed 41.68mph on 4s.

I just picked up a Flux and was wondering this exact thing. I cant decide id I wanna go for 6s or 4s.

Compromise and go with 5s! Just run two 5s smaller packs in parallel. ALthough I usually don't recommend this because both pack should be exactly the same voltage prior to hooking together...

BTW, nice avatar. It reminds me that I have the first 14 (IIRC) comics from back in the day. Might see what they're worth on eBay...

Yeah I really do want to run a 5s, but I cant afford two 5s packs right now. I am thinking 4s... but Im not sure if it will solve my power craving :)

Trust me, it's hard enough keeping it on it's wheels with a 4s set up!!!

4S is actually driveable on a track. Unless you just want high speed passes and straight line running, I wouldn't recommend running anything greater than 4S. Besides, if you want just a little more speed, just change a tooth or two on the pinion.

Bah, get 6s!

On 6s can you run the 20t pinion or do you have to run the 25? There is a guy on ausrc.com who is being told he smoked his ESC on 6s as he was undergeared, but my understanding was undergeared = hot motor, not blown esc! Also seems strange to gear "higher" for 6s than 4s

I just picked up a pair of 5s 2500mAH packs to run in a parallel setup for my E-revo, so 5s 5000mAH 25c. Packs are supposed to be highly underrated (can take 70c burts without dipping below 3V per cell). Picked them up for $120 each, thats $7 less per pack than i paid for my polyquest 2s 5000mAH 30c harcases that i use in series for 4s.

linky: http://www.rc-monster.com/proddetail...p4843128sp255s

Definately a good price on a great lipo. I will second the use of a pair of 5s packs in parallel, seems like the best bet for the 2200kv motor.

I'm kinda wondering how soft you guys run these!

I took my Flux out this arvo, still a good 30-31c (90f) out, lost the 4 shock spring retainers in the first 2-3 minutes but persisted, with the crime fighters it was uber low (probably dragged a bit at times) Certainly wasn't chucking a wheelie that low!

Motor peak temp was 165f
Batteries 125f
Speedy 117f (but I did hear the fan come on)

Batteries were 2 * Harris 5000mah 2s 30C Hardcase Lipos


although I think the bottoming out probably increased my amp draw and temps a tad.

I will say this, this thing is FAAST on 4s, I ordered a pair of 3s Zippys today for a 6s set up, but I'm almost scared to try it!

That's strange that you lost some of the preload spacers. I have had some horrific crashes end over end with mine and haven't lost any of them.

Just got my flux tranny off ebay and opened it up. Why did HPI leave 2 gears on the top shaft and idle shaft? Is it really adding any strength? The big gear on the idle shaft is wobbly, not sure why they would make it like that. I would have just made teh gears wider if they wanted more strength. opinions

I ordered a few 3s Zippys also. I am hoping they are going to fit w/o any modification to the trays. Which ones did you buy? I bought the 20C 4000mah's.

Top shaft is the same as the nitro. Not sure why the large gear on the center shaft wobbles, may need shims...

I am running 6S and I had to dial it down to about 5S using the Travel adjustment on throttle. 6S is way to much for this thing. It turns into a massive load floating on ballons.:gasp:

I agree..Its nice to know that you pull it full throtle and have more power than say pull it full throttle and get no more gas...its like a scooter sure it feels fast right when you pull that throttle, but after awhile your still hitting 30mph and it takes you 15 more mins to get to 40 while a ducatai its nice to have power on demand WHEN NEEDED.

instead of using two 5s packs in parallel, could you not use a 2s and 3s pack together? So long as the mah and c ratings and brand were the same. i was just curious as i wanted to try my flux on 5s to see what its like as 4s is fun but id like a little more.
http://www.hobbycity.com/hobbycity/s...idproduct=9961
http://www.hobbycity.com/hobbycity/s...idproduct=9962
i have a hyperion charger i would use to sync them as a 5s pack. what are your thoughts?