MrBlack

When using a cut off it can sometimes have the sputtering issue under full on throttle from full off. This "spike" can cause the shut-off to engage. To prevent this I would recommend disengaging the voltage cut-off.

Our batteries can handle being brought down below 6V under bursts or spikes but the voltage cut-offs cannot see the difference between a spike or normal voltage drop. This is why drivers who are smooth with the throttle do not have this issue. Large capacity Li-Po's do not have as much of an issue because you are dealing with more capacity which give you voltage for a longer period of time but there are several drawbacks to using large size LiPo's fitment being the major one. In a perfect world we would get more capacity, C rating and it would still fit the sexy case. That I assure is on it's way along with many other options.

Joel Lagace

iTrader: (4)

Looks like our club will run lipo this year.

I have a few questions, forgive me for not scanning 30 odd pages here


1-How much does the 3200 weight?
2-How much does the 4800 weight?
3-How much will the heavy pack weight and at what capacity will it be at?
4-Assuming I will only race stock is it reasonable for me to assume i could tape/glue/screw.... a 4800 into my chassis for the year and simply repeak between every run and get the same performance for race one to say race 20 later on in the year?
5-Compared to a NIHM pack what is the expected lifespan of a lipo?

Thanks

Leodis

iTrader: (16)

1) 198g

2) 258g

3) Mr Black said the heavy pack will weigh as much as an assembled IB4200 race pack and he originally said that it will be a 3200, but I think he's hinted that Orion has upped the ante. My buggy and truck want me to buy two of them like right now. C'mon Mr. Black, give us some info!

4) It's probably not a good idea to store any kind of battery in your car, but lots of people are doing it with Orion lipos. As far as overall performance goes, my nephew and I have cycled the 4800 35 - 40 times and it's turned me into a lipo fanboy. The future is here. Get on the bus.

5) They say the new batch of IB4200's are better than the old ones, but I'll believe it when I see it. I've had 4 cells go bad in the last year alone and I only use 3 packs. Once I buy those heavy lipos, I won't have to worry about batteries for a couple years. Running multiple classes will be so much easier and cheaper for people who don't have the cash and/or desire to have two chargers and 6 NIMH's. With lipo + BL, the only stuff I'll have to worry about is breaking parts and keeping the tires fresh.

Joel Lagace

iTrader: (4)

Thanks, i guess the 4800 would be the way to go then since its closer in wieght to the 4200 plus has the capacity for 19t or mod racing...

Fitment of the 4800 is good on a 007 i assume?

One last thing. How does 3200 capacity hang with 4200s in stock 19t and mod? I woudl think no issue in stock but possibly voltage drop to much for 19 and mod?

Thanks once again

Leodis

iTrader: (16)

I'd get a 3200. It's got cool notches on the bottom that make it perfect for a cf chassis. I've heard that Orion 3200's are comparable to an IB4200 as far as run time goes.

andrewdoherty

iTrader: (49)

4800 won't fit a 007. The 3200 can handle a mod or 19t just fine, both in terms of voltage demands, and in terms of run time. I only use about 1800 mahs in a five minute stock race. Theres no ways you'll dump a 3200 even with a mod after just five minutes, IMHO.

To fit the 3200 in a 007 there is some minor modifications neccessary to the case however. Nothing major, just some shaving here and there.

Dave Walton

iTrader: (5)

I am running the 3200 in 4 wheel drive buggy with a Mamba 7700 system and I do not dump in a 5 minute race.

Turbo Joe

iTrader: (41)

http://nexusracing.net/newsdesk_info...fdd2ca4f39c0e6

rcgen

I am thinking about switching to lipos for my touring car(rdx). I am currently running 13.5 and soon the 4300 bl. I like how the 3200 looks and would fit in the car w/o and mods. The 4200 looks bulky but I'm sure it will fit. So which one should I really go with to do some competitive racing? Should I be thinking like the nimh 3300vs3800vs4200.

syndr0me

iTrader: (32)

I've run them both, and they work about the same. LiPo, unlike NiMH, doesn't perform better or hold more voltage as the capacity goes up. The 3200 packs have the same voltage, and hold it remarkably well during the race. You might see a tiny bit more voltage at the very end of a race from a higher capacity pack since its discharge curve is longer, but I honestly didn't notice a difference. I ran the 3200 in my RDX without an issue. The 4800 was flat, and didn't have anything to anchor it in place. Maybe some of those weights from Nexus that fit into the battery slots might help.

One bit of advice, though. Use tape to hold the battery in. It's a big hassle, but I ended up tweaking my chassis trying to keep the battery in there tight enough that it wouldn't slide around. Using tape (and getting a Type-R! :-D) solved that problem. It will also give you some room on top of the battery to add some weight.

rcgen

Thanks Syndr0me

ImGoinRCn

iTrader: (4)

I have my problem solved! If anyone was having this trouble, this what I did. I emails Novak and Steve told me to shorten the two 20gauge wires as short as possible and that is what fixed mine. They might be 3 inches, if that. Hope this helps on this thread who use the BL and Orion 4800 w/ the Smart Stop.

Heath

syndr0me

iTrader: (32)

What does a battery "feel" like when it's gone out of balance? I've noticed that my two 4800 packs have started to go flat (it's reflected in the lap times) after about 4 minutes. This happened with my Carbon packs, and at the time I thought maybe it was due to capacity. Getting Platinum packs solved the problem, but now it's starting up again. I've tried gearing my motor all over the place, and even when it's clearly undergeared, the lap times drop off by several tenths by the end of a 5 minute race. At this point, I'm hoping it's just a balance issue (I have a balancer coming). If not, and a new battery fixes the problem again, I'm going to feel deep concern over how LiPo will play out in competitive racing. :-(

wcalaker

iTrader: (1)

Good question. I want to know the same thing. My pack feels like its been "flat" for awhile now. Did some studying and lately all my fastest laps are at or around lap 6-9 on a 16-17 lap race. At the 3:30 - 4 min mark it starts to lag a bit and the punch is gone.
As far as competitive racing, I feel the Lipo is more for convienance than for full out racing. At our place, all the top guy use NiMhs. One guy did a serious comparison of his 3200 pack and 4200's. He couldnt keep up with the top guys with his 3200; he changed over to 4200's and he was right there. He had numbers, voltages, track times...the Nimhs were consistently faster.
I love my lipo, but i want to get serious soon and feel I gotta go back to the pita nimh battery to be competitive.

syndr0me

iTrader: (32)

John Stranahan's thread has some interesting stuff about his experience with LiPo. It seems like the packs with safer chemistry (such as the Kokam's used by Orion) lack voltage compared to their peers. John went so far as to say the voltage of a new Orion pack is about where his other packs are after 50 cycles, and when he retires them. Again, that's troubling. Knowing how competitive racers work, this could lead to a murky future for LiPo outside of bashing. Bummer. :-(