14.2 second 1/3 mile? (oval)

[jhautz]

Double check all of your o-rings...:005:

Sorry. Ruining the thread. Back to reality.

yeah... back on topic

ok, guys, tell me if this looks good. i want to make sure I'm not going to have any problems w/ batteries/ubec/balancer/li-saver/charger all working together.

1x - $280 - Quark Monster Pro 125b - http://www.rc-monster.com/proddetail...RK_125A&cat=21
1x - $90 - Feigao 540C-7XL - http://www.rc-monster.com/proddetail...540C_XL&cat=20
2x - $140 - MaxAmps Lipoly 4000mah 5S 18.5V Pack - http://maxamps.com/index.html?lmd=38931.363981
2x - $30 - 5s Smart Balancer & Guard 505 - http://home.comcast.net/~truerc/Charge/chargers.htm
1x - $25 - li-saver - http://www.atsrcplanes.com/lisaver1.htm
1x - $38 - UBEC - http://www.rc-monster.com/proddetail...=6vubec&cat=18

+ 2x astroflight 109 chargers.

is the li-saver nessecary with the 125b?

[BrianG]

You won't need the li-saver since the Quark has a built-in low voltage cutoff.

LOL, did you expect to pay over $1,000 on this project?

Originally Posted by BrianG

You won't need the li-saver since the Quark has a built-in low voltage cutoff.

thanks, i just wasn't sure how well the internal cutoff worked.

Originally Posted by CrazyPhantom

LOL, did you expect to pay over $1,000 on this project?

heh, stuff* happens :dft001:

new, much stronger design.




50lb of pressure:

[Mike.L]

you going to get that milled out for a final? looking even nicer!

[MetalMan]

I think you might want some batteries that can handle more current. At 5s, the 7XL is going to need the amps. I don't think you should be looking at anything under 60amps continuous for that application.

Originally Posted by Mike.L

you going to get that milled out for a final? looking even nicer!

that's my plan. don't have the $ right now, so slowly but surely, shouldn't take much longer :024:

Originally Posted by MetalMan

I think you might want some batteries that can handle more current. At 5s, the 7XL is going to need the amps. I don't think you should be looking at anything under 60amps continuous for that application.

Originally Posted by A4DTM

2x - $140 - MaxAmps Lipoly 4000mah 5S 18.5V Pack

it'll be a 5s2p pack, 96a constant / 128a burst

[Serum]

The 7XL takes 120-130 amps with ease on 5S. (I've got it logged with my eagletree) in acceleration it takes a solid 1500 watts for about 2 seconds. (till it reaches top speed)

[MetalMan]

Silly me, I just wasn't looking. I think the setup that you have chosen should suffice.

On that strength test in the short video.... where did you put the restraint points when calculating the test?


Also? We are machining the whole battery/middle piece out of 1 piece?(Thought it was going to be 2 piece)

Originally Posted by Serum

The 7XL takes 120-130 amps with ease on 5S. (I've got it logged with my eagletree) in acceleration it takes a solid 1500 watts for about 2 seconds. (till it reaches top speed)

what vehicle was that in? Do you think i'll over draw the lipo's then? this'll be alot lighter than monster trucks, so I'm guessing it won't pull as many amps then?

Originally Posted by CrazyPhantom

On that strength test in the short video.... where did you put the restraint points when calculating the test?

Also? We are machining the whole battery/middle piece out of 1 piece?(Thought it was going to be 2 piece)

restraints were put on the 4 tabs, that get screwed to the stock chassis.

and, yep, 1 piece for the battery trays. 2 pieces all together (motor mount and battery tray)

ok, what do you guys think batterywise....

will 96a constant / 128a burst be enough for a 7xl in this car?

and as for balancers.. I just read the thread about the eos 7i lba6 balancer here: http://www.rc-monster.com/forum/showthread.php?t=3971
it somewhat cleared up alot of questions i had about lipo.

questions:
can the Smart Balancer & Guard 505 balancers balance without being hooked up to the charger? do i just put a load on the charge input? or do i just plug it into the battery and it does it's thing?

would it be better to just get two lba10's, networked, and get a charger capable of charging 10s packs, and charge them wired in series?

would two lba10's networked work if I charged the packs seperatly, with my two 109's? if they're running off the same power supply?

help me make sure I'm doing the right thing. what would you guys decide if you were in my shoes?