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PDX-Spike 12-19-2009 10:23 AM


Originally Posted by hans_swe (Post 6739676)
Hi guys
I do have some problem with my SMC 3.7v LI-PO cells that i bought from rcmarket.hk.com. I did buy 3 cells and with 2 of them the car dump after 6min. I have LRP Sxx with 5.0t motor and LI-FE 6.6 reciever acc.
Does anyone experience the same problem ?? or maybe i have got 2 bad packs ??

I have charged them 7 times & discharged 1, charge with 1C & disch 10Amp
Both ch & disch is over 5000mah

// hans

NEVER DISCHARGE A LIPO BATTERY!

Are you using a LiPo-specific charger? You should be charging at 3.7 volts and 5.0 amps for a 5000ma battery.

I'm running a 13.5 motor with the SMC 5000 single-cell LiPo. In 8 minutes I'll use around 3300 ma. on a 100 x 60 carpet track.

SteveL 12-19-2009 02:32 PM


Originally Posted by kawirider (Post 6736529)
these batteries were slated to come out months ago, release has been pushed back over and over again. i wouldnt hokd my breath if i were you guys. maxamps told me they could make one right up if you want one.
so, steve, did you get that 8.7 lap you were looking for last nite?:sneaky:

Nope, only a couple of 8.9's. It will get there, but as soon as it does, Drew will run an 8.5!:rolleyes:

ds400 12-20-2009 12:22 AM

Hey guys, we are new in 12th scale racing and we race on asphalt on a low grip track. Got some questions if someone could answer them and give me son advise.
What is recommended for asphalt low grip, Tbar cars or link?]
What if the front tyres get beigger than rear tires... how will that affect the car handling?
How do you tweak a link car?
Cheers

hotdognobun 12-20-2009 01:30 AM

Any know a good pinion staring point when running 96 spur, 5.5 brushless, with 3.7 1cell lipo. I am running high speed pave surface. THX

Yokomo_Ant3 12-20-2009 01:57 AM


Originally Posted by hotdognobun (Post 6742047)
Any know a good pinion staring point when running 96 spur, 5.5 brushless, with 3.7 1cell lipo. I am running high speed pave surface. THX

I used 100/23 with a 4t. So i reckon around a 26 or 27. You really have to play around with gearing in mod. its hard to find the sweet spot with 1s lipo, but when you do youll know. I was also using large tires.

Hope this helps,

Antoni

hotdognobun 12-20-2009 01:58 AM


Originally Posted by Yokomo_Ant3 (Post 6742081)
I used 100/23 with a 4t. So i reckon around a 26 or 27. i was also using large tires.

Hope this helps,

Antoni

Sounds great! Thx

Yokomo_Ant3 12-20-2009 02:02 AM


Originally Posted by hans_swe (Post 6739676)
Hi guys
I do have some problem with my SMC 3.7v LI-PO cells that i bought from rcmarket.hk.com. I did buy 3 cells and with 2 of them the car dump after 6min. I have LRP Sxx with 5.0t motor and LI-FE 6.6 reciever acc.
Does anyone experience the same problem ?? or maybe i have got 2 bad packs ??

I have charged them 7 times & discharged 1, charge with 1C & disch 10Amp
Both ch & disch is over 5000mah

// hans

Could it be your gearing possibly? I used a 4t at the Australian Nationals, with a booster and made run time. And the track was HUGE.. You could also try lowering your profile settings on the speedo. mine were 2-2-0-1.

+1 i wouldnt discharge a lipo. Just put enough power into them and store them till you next race.

Antoni

Yokomo_Ant3 12-20-2009 02:09 AM


Originally Posted by ds400 (Post 6741952)
Hey guys, we are new in 12th scale racing and we race on asphalt on a low grip track. Got some questions if someone could answer them and give me son advise.
What is recommended for asphalt low grip, Tbar cars or link?]
What if the front tyres get beigger than rear tires... how will that affect the car handling?
How do you tweak a link car?
Cheers

Ive heard that many like t-bar cars on asphalt, but it depends on your driving style. I prefer link, and most people do these days. Also lipo fits much easier in them, than t-bar cars.

i would personally NEVER run bigger tires on the front than the rear on asphalt. you want a really bid rear tire on low traction asphalt, so when you go around a corner there is more side bite and flex from the tire, therefore giving you more rear grip. if you run bigger front tires, i would say that the car would be very oversteery and have limited rear traction. I have never done it so idm not sure.


Originally Posted by hotdognobun (Post 6742083)
Sounds great! Thx

No worries. hope its fast:D

hans_swe 12-20-2009 03:24 AM


Originally Posted by Yokomo_Ant3 (Post 6742089)
Could it be your gearing possibly? I used a 4t at the Australian Nationals, with a booster and made run time. And the track was HUGE.. You could also try lowering your profile settings on the speedo. mine were 2-2-0-1.

+1 i wouldnt discharge a lipo. Just put enough power into them and store them till you next race.

Antoni

I did run with the same rollout with the 3 cells to have something to compare with. :confused:

Yokomo_Ant3 12-20-2009 03:44 AM


Originally Posted by hans_swe (Post 6742165)
I did run with the same rollout with the 3 cells to have something to compare with. :confused:

4 cell?:blush: Depending on your track size i would start with a rollout around the 41mm range.. if need be go higher and start gearing for run time. Its better to be a little bit slower and make run time, than go full blaze and crawl home.. Which you cant do with lipo or you will drop it below the optimal voltage and damage the pack.:nod:

If this dosent work the battery may be damaged. But i would suggest muckng around with gearing first.

Antoni

Jamesalex 12-20-2009 03:54 AM

ok stupid question but, I am new to 12th and gt and am going lipo.

I will be running a 3.7v lipo and a reciver pack.

When I go about running it do I switch the speedcontroller on then connect reciever pack then plug the battery in.

or plug battery in plug reviever batery in the switch on, also I will be running a lrp spx stock spec speed controller what setting should I put it on to allow me to run 1c lipo????

Cheers

AreCee 12-20-2009 06:02 AM


Originally Posted by Jamesalex (Post 6742203)
ok stupid question but, I am new to 12th and gt and am going lipo.

I will be running a 3.7v lipo and a reciver pack.

When I go about running it do I switch the speedcontroller on then connect reciever pack then plug the battery in.

or plug battery in plug reviever batery in the switch on, also I will be running a lrp spx stock spec speed controller what setting should I put it on to allow me to run 1c lipo????

Cheers

Depends on your ESC and its software. The Tekin has a setting with the Hotwire which sets it up for 1S. You have the option to leave it off and it won't monitor the 1S voltage or turn it on and the cutoff will function. This is with either a RX pack or Booster. I turn on my Tekin so the cutoff will be active for the 8 minute main. So far it hasn't cutoff.

RoyU 12-20-2009 06:13 PM

Under ROAR rules, what is the maximum height for the roll over antenna? I can't seem to find it in the rule book.

PDX-Spike 12-20-2009 09:36 PM


Originally Posted by RoyU (Post 6744662)
Under ROAR rules, what is the maximum height for the roll over antenna? I can't seem to find it in the rule book.

35 Centimeters, measured from the ground. 2009 Rules Addendum, 8.10.3.9.

RoyU 12-20-2009 09:48 PM


Originally Posted by PDX-Spike (Post 6745573)
35 Centimeters, measured from the ground. 2009 Rules Addendum, 8.10.3.9.

Thanks


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