Evolution of G2R Race Truck
 

Now that i have tried bl, seen how it works, im ready to try somthing new. I will be making a track and will be racing a emaxx for fun, now im ready to take the plunge into lipo:) I was thinking about these http://fmadirect.com/Detail.htm?item=2091&section=32 and with 2 of these chargers http://fmadirect.com/Detail.htm?item=1925&section=32 . Now that is 1 thing for my revo, ive done some reading on LVC's and lipos in general. Mike, would you be able to get me these? I still have a 5% discount i need to use:dft012: Will these save me a bit if any noticable weight, im also gonna be using aluminum pillow balls, traxxas red rod ends, aluminum hollowballs and rocker posts.

Now, what else will i need? Can someone give me a link to a power supply that mike can get me? Thanks, ill post pics once im done doing some of my work.

ya selvester then that will be crazy!!!! Oh I See ... e-maxx for now lets gust stick gp3300 and nitro mt, how about that.

ya get that track ready for some races and BASHING!!!!!

Im not sure, i might have to wait on that:( I just wanna get lipo than im set:)

lol i just have to get money so i can get the e-maxx.
then maby a couple changes(minor:P)
find a couple spots to race and bashing

Then im SET!!!

How are these lipos? Ive heard many good things, but what i like the most about these lipos is SAFTEY. Anything before i dish out 400$ on batteries? :D

Here are some pics of the base truck and my nylon block for esc.

And heres the tranny i will be using, single speed, with mikes idlers.. And note that i will be modifying the block, i will be milling it down so the ubec and controller mold in with it, it will also save some weight.

I was thinking of getting some sort of support for the lipos, maybe some sort of battery tray, i remember seeing one, i just dont recall where, would it be needed or will the lipos stay in there place?

Any opinions out there on these fma lipos? Will it be close in speed torque , because it will have 14.8 v but the motor handles 19.2? thanks.

i wouldnt go for those. they wont give you great runtime, then again, if your not worried about runtime there a great battery.

Oh i see, but i thought that if its giving out 14.8 V - some weight would equal good runtime, + the motor is 10l, but i might go with 5s lipo which me and mike are discussing:)

i would comsider the cell pros. they come in a higher mah.

linky?

http://www2.towerhobbies.com/cgi-bin...ro&FVPROFIL=++
http://fmadirect.com/products.htm?cat=45&nid=4

I don't know that I would go with Kokam/FMA. IMO, they're overpriced for what they are. You could go with Hyperion or Polyquest XP or Flightpower or Duralite (etc.) and still get very good cells, possibly at a lower price.

FMA has a complete line of products.
If you're worried about price then thats one thing but the FMA line is the best out there imo. (because of the safety and performance levels).

The cell pro's would be a good option if you are looking at using 3s and/or 4s packs. The only issue I have with the scorpians is that they only come in 2s configs but if your running 4s they will work great. I run 6s (2x 3s) FMA BalancePro HV's (formerly skyvolt). I had a compatibility issue with the FMA DPM and the BK 9920 esc. I worked with Nathan, @fma, and he is modifying the BalancePro DPM line to work with the BK controllers. I'll get my new DPM's next week. I've had good customer service from FMA and like the products.

I think I may pick up a set of cell pro's for my next set of packs.

The major advantage of FMA is a proven product line that has a complete package of 20c discharge rate cells, a balancing charger, LVC's and a 3C CHARGE RATE available. You can rest assured that you can quickly charge your packs in a pinch with the 2s or 6s chargers. (with-in 20 min anyway). The cellpro charger only charges at a max of 3 amp.

I haven't been able to complete a run on my FMA skyvolt cells before my truck has given up (broke :005: ). the last time at the track, I ran over 25 minutes when my truck gave up and the cells were still at 20 volts. The only issue I have experienced with lipo's, in general, is the degraded runtime in low temp environments. I keep my packs in my pocket, when its cold, and use a heat gun if necessary. I think MetalMan actually suggested heating them up and it works :027:

Thanks for all the input guys. I am going with 14.8V 3200 mah cells, even though they are a bit pricey, i LOVE the fact that they are safe and have a quick charging process, and i all have to do is plug and play basicly. Will i have any issues with the fma lipos with my bk9920?

I use the FMA Scorpion Packs in my Brushless E-Maxx and I can't say enough good things about them. I've always been a lower voltage BL guy, 14 cells before and now these 7.4v packs x2 now. All I can say is they certainly perform better than my 14 cell packs (and I was using good packs!) plus the weight savings allows you to do things with your truck not previously possible. The LVC hookup is simple and safe. Best of all, they were totally drop-in and race. No mods needed. (I use an 18.97 & a 10L or 9L) killer speed, way more punch and peace of mind. My advice, get one pair and two chargers, this way you can race the same packs several times per day. I had plenty of time between heats to let the packs cool and then charge them to 90%. At bigger races I can slow charge them to 100% with plenty of time.

Sylvester,
I just worked through the issue with the 9920 and skyvolt DPM's so I don't know if the scorpians have the same issue but I'd imagine they would. Nathan said they will be updating all thier DPM's but, to be safe, I'd contact FMA before you get the scorpians. Even if you did end up getting a set that didn't work, you could send it to FMA and get it corrected. If you buy them directly from FMA, you could request a compatible set for the 9920 and save yourself some time :027:

What was the problem starscream?

and Sylvester! somehow i missed this thread, nice revo! i've seen the GPM arms from Daniel, they are the ones you want on a revo.. Nice..

Yeah it is a very nice revo. I wouldn't mind testing driving it for you slyvester. ;)

Leroy, you can come and test drive mine ;)

Nice G2R, Sylvester! I'm only beginning to taste the power of Lipos, but so far I love them. I will never buy Ni cells anymore. 5S is already "too much" for me... well, almost.

We will have to discuss this test drive further. You can take me over rene's for a test drive of his savage to. ;)

I'll buy a lottery ticket tomorrow, with you in mind. Promise.
But I don't know about Serums Savy.... :005: I let him tell you about this.

Strascream, Are you sure that the 9920 will have problems with fma lipos? Thanks for all the compliments guys! I Was gonna use 5s lipo but i am confused with all the lvd/lvc stuff, and the fma has it all wired and ready to go. What will my runtime look like with 3200mah 10l ? (geared 18/64)

MacII, how long do your batteries take to charge?? What runtime do you see (we use same motor do we not? (10l) and what power supply do you use? (i want a power supply which i can hook both chargers up to)

Honestly I use mine exclusively for racing, I got my LiPo's at the end of last year, raced 3 Sundays (4 runs per day) and I never pushed the limit of capacity so I can't really say how long you will get. In race conditions they were stellar start to finish for the 5 minute heavy throttle runs. This weekend is the first day of open practice so I plan to take them out for some more running and maybe with the temps outside so cool I'll run for more than 5 mins (I don't like to push the motor/speedo...thermal problems can result) Anyway I use the Competition Electronics 23 Amp Power Supply. The battery charge has been all over the map for me, 80% in 20 mins at 3C is not uncommon but I've started to lower the charge rate and still get to 80% in 30-35 mins. I've just made an adapter for checking voltage of the LiPo's while driving (using a Nomadio Sensor). Very slick.

Thank you macII, i should have a lighter truck than you (less bling/aluminum), 5 mins of hardcore running sounds nice, and since my motors a 10L not a 8L, i should get a min or so more of runtime, right? Any ways im awaiting a email from mike confirming that he will get me these lipos/charger, is there anything else i should consider/know before i buy them? Thanks for all the help, especially you , Mac. :)

Its been decided, im going for the 6400mah cells because mike has reccomended them, and because the 3200 are 2s4p, so the charger will not work with them, more runtime baby! :)

Serum,
The DPM connects in between the receiver and esc (9920 in my case)
The problem was that the signal was not getting from the receiver to the esc due to an issue with the DPM (signal voltage incapatibility I believe). At any rate, this issue should be addressed in new dpm's from FMA.

Sylvester
Those Kokam cells, configured at 2s4p, would be 12,800 mah so I'm not sure what you were trying to say exactly. You can't charge both packs at once though, this will require a second charger. I have two 6s chargers just for this reason.
I use the same power supply as MacII. I have to limit the charge rate to ~7.5 amps to run both chargers at the same time.
Both the 3200mah and 6400mah packs will work on the 2s charger.
For racing, I'd get the 3200's but if your looking for runtime, the 6400's will definetly do the trick.
Either way, I'd check with Mike and see if he has used his scorpians with a 9920 esc yet and let him know about this issue so he can address it when ordering packs from FMA.

I know Mike's run them with a MGM16016 but not sure about the bk's

Guys, can i use this for 2 chargers? http://fmadirect.com/Detail.htm?item=1994&section=57

Depends at what rate you charge. For 1C charging, sure but more than that...nope. I would suggest the CE 23 Amp, lots of headroom... or something with at least 20 amps.

Well if you going to run the 6400 batteries and charge at a 3c rating you will be charging at 19.2 amps per battery.

If these chargers were truely 3C chargers, coolhandcountry would be correct, but I believe these chargers will only charge at 10 amps max so the 6400mah packs should take twice as long to charge as the 3200mah packs.
These chargers charge the packs with around 80% efficiency so your looking at atleast 12 amps per charger.
With those numbers the CE23 amp power supply should handle charging at 9.5 amps but personally I would charge at less than that to be safe. I usually charge at 7.5 amps with two chargers, just to keep the power supply happy :027: .

Do you know if either UE or Gorilla Maxx will bring out a suspension kit for the Revo like they did with the Maxx?

The revo is superior in suspension, it would take quite some engineering to improve it. and the question is; Why?

And knowing UE, they don't invest time in developing anything new anymore.

Thanks for the info, Serum.

With the suspension of the maxx, g-maxx did a nice thing with lowering the shocktowers and raising the mountingpoint of the shocks. WIth a revo, such a thing isn't needed, look at it.. It looks sweeter than sweet already..

Yea Serum - them revos are nice looking - im lookin at one now - izzz nyyyceee...

If i was looking at the one see walter. I don't think i could say much but drool. :027: