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-   -   Viper RC - (https://www.rctech.net/forum/radio-electronics/455152-viper-rc.html)

UK.hardcore 05-05-2011 10:43 AM

That's coming soon.

mini-dub 05-05-2011 11:03 AM


Originally Posted by Breeze (Post 9065856)
Are those without wires?

Yes without wires. Weight including wires would be relative to your chassis layout, wiring technique, and wire gauge.


Originally Posted by jurquhart (Post 9066110)
does Viper make a motor that will handle the weight of the Losi ScTE 4x4? If so what motor is it

They are coming, keep your eyes out for an official announcement soon!


Originally Posted by Fabulous (Post 9064338)
Can the capacitor board be de-soldiered and re-soldiered to the back of the esc?

Just be sure to keep the polarity correct. The capacitor bracket can be remounted anywhere on the car using extension wires.

mini-dub 05-05-2011 11:11 AM


Originally Posted by drt_racer5 (Post 9065034)
Ok I need some help/ I have a viper 8.5, novak GTB in a sc10. It is currently geared 21/84 and adv the timming to 40deg. it runs at 130 after a 10 min run and this thing is only slightly faster than my balistic 10.5 with same exact gearing, with the adv timing I do love how smooth it is out of the hole. I put in a friends novak 8.5ss geared 18/84 (the recomended starting point for 8.5) and it will shit all over my viper 8.5 with the 21 gear. I started at 18 and it wouldnt out run a 17.5 great temp though it was only about 90 deg after like 15 min. So my 1st question is do I keep gearing with stock timing till I get to like 150 deg? or can I leave tinming where it is add another gear or 2? which is better?

How large and/or open is your track? 18/84 or 18/87 is where I'd recommend starting the VST 8.5/VTX10 setup on a ~45x80ft tight track. As you increase motor timing you'll lose a lot of torque, so gearing up and increasing motor timing simultaneously isn't usually the best combination. Perhaps try timing back to default 30* and gearing up farther, it should only take a couple more teeth before you see the proper temps and performance. Obviously if the motor comes off at 90* in 15min it is not being pushed to its potential. And I'm thinking when it was running 130* it may have been over-timed for that gearing and running inefficiently so it was getting up to temp but not setup properly. We almost never adjust motor timing in the positive direction, if I ever touch it it's usually retarding it to get a little more torque.

mini-dub 05-05-2011 11:32 AM


Originally Posted by beazer30801 (Post 9058434)
I must have had something set up wrong I put the esc in my 2wh buggy with a 13.5 and added boost and timing and it ran like a 21.5 I need help with the pro gauge.

Pre-set profile #3 and 29-30/72 will be an excellent starting point for 2wd 13.5 boosted. If you're not running a VST 13.5 please let me know the KV of your 13.5 as we may want to make some alterations to the acceleration boost rpm ranges.
In general, a lower start rpm for the acc boost will be more aggressive and create more heat. As well as a lower finish rpm for acc boost will be more aggressive and add the acceleration boost timing more quickly, as well as initiate the top speed timing earlier.


Originally Posted by trilerian (Post 9062250)
I don't think you are doing anything wrong. I can't get a 17.5 to run any faster with boost than in blinky. I have tried small increments of timing, large increments of timing. In a short course truck I have geared from 6.0 fdr to 9.5 fdr and nothing; it is a pooch. I have tried to understand the timing theory to see if it was my ignorance that is the factor, but my other companies speedo's seem to do what this can't. One thing I have noticed though; endbell timing on the viper motors have more impact than the speedo timing. I am hoping that with a 9.5 in a 2wd buggy it will be enough, cause it is coming out of my sct.

Clearly if you're not getting more speed out of a boosted setup vs. a non-boosted setup something is wrong... But you didn't really give any details here for me to try and improve upon. The VTX dynamic timing function creates massive rpm under less loading, you really need to gear down significantly when running boost. For instance I would start a 2wd VST 17.5 boosted at 29/72, but for 2wd 17.5 non-boosted you need like 35-37/72. Non-boosted 17.5 TC at 3.4-3.7 fdr, boosted 17.5 TC around 6.3-6.5 fdr.
From what I can gather you may have been trying to boost a 9.5 in your SC? Which truck exactly? What gearing? Did you just start with a preset profile? Which one? None of the pre-sets are really appropriate for a boosted 9.5. How large/open of a track are you running? What did you gear it? For a boosted 9.5 in a 2wd SC you will probably need to be gearing around a 15-16/87.
Like I said, our boost function creates massive rpm the lower the loading. Be careful when bench testing...
http://a3.sphotos.ak.fbcdn.net/hphot..._7159809_n.jpg

jhhack 05-05-2011 11:34 AM

something happened to your tires. lol

trilerian 05-05-2011 12:00 PM

mini-dub,

My normal setup in the sc truck with tekin systems has been 17.5 geared at 75/24-26. Timing maxed in the esc. I tried the vtx10 w/viper 17.5 geared from 78/21 all the way to 72/31. With small amounts of esc timing, 10/10, all the way to 40/40. With the 72/31 gearing in blinky mode, it was the fastest, but that was also with the endbell timing all the way up. With that gearing the motor came off the track at 130* after 3 minutes, but the air temp was only 60*. But you are saying I need to go lower than 78/21 with timing, even though the car was topped out after about 25-30 feet?

savageboy69 05-05-2011 12:17 PM

are you running a 72/31 in a sc10? that combo is about 20% over geared, a 7.5 fdr is usually a good starting point for a sc, and if you are goin to add boost from a esc you will prolly wanna be around 8.5fdr , so a 75/23 would be close. adding motor timing is only gonna add to the top end but on the same token kill your tourque, normally on boosted escs you leave your motor timing at default or if anything retard it for more torque and add timing on the esc to give you top end and keep your motor cool, im just speaking in general because i havent got my vtx yet

mini-dub 05-05-2011 12:31 PM


Originally Posted by trilerian (Post 9067251)
mini-dub,

My normal setup in the sc truck with tekin systems has been 17.5 geared at 75/24-26. Timing maxed in the esc. I tried the vtx10 w/viper 17.5 geared from 78/21 all the way to 72/31. With small amounts of esc timing, 10/10, all the way to 40/40. With the 72/31 gearing in blinky mode, it was the fastest, but that was also with the endbell timing all the way up. With that gearing the motor came off the track at 130* after 3 minutes, but the air temp was only 60*. But you are saying I need to go lower than 78/21 with timing, even though the car was topped out after about 25-30 feet?

The notes I have for VST 17.5 boosted/VTX esc is 26/81-84 in a SC10. I doubt you'll want to go lower than 21/78, that's likely much too low. I would try starting with preset profile #4, perhaps increasing the max adv top speed timing to 30* from 20*, gearing 26/81 (or 25/78 if you don't want to chance spurs), and 30* default motor timing.

How large and open of a track are you running on again? High speed, open, flowing tracks definitely require a different gearing/timing setup than tight, punchy tracks (which is more what my starting recommendation there is oriented for, so if you're running on a large high speed track you may want to gear up 1-2t).

Some people have had good results with boosted VST/VTX combos turning the motor timing down to 15-20* and increasing the max adv esc settings 10-15* to compensate. This may be something to try as well.

mini-dub 05-05-2011 12:35 PM


Originally Posted by savageboy69 (Post 9067312)
are you running a 72/31 in a sc10? that combo is about 20% over geared, a 7.5 fdr is usually a good starting point for a sc, and if you are goin to add boost from a esc you will prolly wanna be around 8.5fdr , so a 75/23 would be close. adding motor timing is only gonna add to the top end but on the same token kill your tourque, normally on boosted escs you leave your motor timing at default or if anything retard it for more torque and add timing on the esc to give you top end and keep your motor cool, im just speaking in general because i havent got my vtx yet

This sounds pretty close to me, Joe! Motor combos are arriving soon, some have already arrived, we will have yours sent out as soon as it shows up :D

savageboy69 05-05-2011 12:38 PM


Originally Posted by mini-dub (Post 9067383)
This sounds pretty close to me, Joe! Motor combos are arriving soon, some have already arrived, we will have yours sent out as soon as it shows up :D

perfect timing lol since i blew up my lrp in wenatchee :flaming:

mini-dub 05-05-2011 12:41 PM


Originally Posted by savageboy69 (Post 9067399)
perfect timing lol since i blew up my lrp in wenatchee :flaming:

Shoe goo does a good job of keeping the smoke in :nod:

savageboy69 05-05-2011 12:44 PM


Originally Posted by mini-dub (Post 9067412)
Shoe goo does a good job of keeping the smoke in :nod:

lol true but im trying to avoid smoke all together, smoke = bad, you gonna make it to the hank in spokane?

Dlewis4 05-05-2011 03:07 PM

Weylin, expect another order of Speedos/combos in the next week... we cant keep em in stock!

mini-dub 05-05-2011 03:25 PM


Originally Posted by savageboy69 (Post 9067423)
lol true but im trying to avoid smoke all together, smoke = bad, you gonna make it to the hank in spokane?

Agreed, if you smoke our speedo you'll be the first! Maybe that will win you another prize :lol: I'm trying to make the Hank! Gotta check out what my schedule is like for that weekend, literally have no idea whats happening haha


Originally Posted by Dlewis4 (Post 9067950)
Weylin, expect another order of Speedos/combos in the next week... we cant keep em in stock!

Us too brother! Glad to hear it! Shoot all your orders to Mike now using the [email protected] address.

rtkota360 05-05-2011 06:19 PM

just got my shipment in today,awsome stuff guys. Cant wait to get it hooked up and in my 10tt. Just added what i got in stock in my store www.j2rcracing.com:nod:


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