[somanywelps]

Originally Posted by winzeracer

Somany,

Ok now I am with you on the A123's though the Amp20's are a bit pricey. I am looking at these http://www.alibaba.com/product-gs/51...3_26650_2.html
Where is a reputable, affordable place to buy a123?

Have not done it myself, look in batteries section

Originally Posted by winzeracer

Where is a reputable, affordable place to buy a123?
I did not find any kelly's above 900amp and even those only had 450a conts, Where did you see the 1000a-1400a kelly?

http://kellycontroller.com/kdh-serie...r-c-25_37.html

[Yabert]

Don't bother to play with 400 small cells. Their assembly is a real pain! The technology evolve, so evoluted with it.
The A123 26650 are so 2008...

I think a pack builded with 76 AMP20 (38S 2P) can be awesome with a potential of 100-120 Kw of peak power (about what I have in my 1900 lbs car with sporty acceleration....).

If you don't need that much power, a small 26S 2P pack (60 lbs) coupled with an Alltrax SPM 72650 (8.5 lbs) can give you a good 50 hp at wheel if your motor have a correct efficiency at 740A.
50 hp in a 450 lbs kart is a serious power ratio.... comparable at some 500 hp sport car.

Originally Posted by winzeracer

That is crazy! I would not be pack limited with this type of setup, but play time might be pretty short.

Short time is relative when you accelerate to 50 mph in 3 sec. and you need 10 seconds to recover from your emotion....

[MN Driver]

Originally Posted by Yabert

Short time is relative when you accelerate to 50 mph in 3 sec. and you need 10 seconds to recover from your emotion....

Umm, can I use this as a quote in the future? I love it!

[winzeracer]

Originally Posted by Ziggythewiz

Sounds quite unsafe, I mean, lots of fun! After driver, battery, motor, controller, tires, what does that leave, 50 lbs for the frame, brakes, etc?

This is what the an experinced Kart racer and owner of a Kart shop said when I asked him about the 500lb kart:

Hi Brock

Adult karts are designed to run at about 375 lb. with driver. There are classes which require the kart to run at 405 lb and already it becomes a noticeable problem to get the kart to turn like it's designed to. When you get to 420 lb+ it starts to become a lost cause. Without getting too much in to the physics, the springs involved just aren't designed to work in the weight range, it's like an adult jumping on a children's bed. Unfortunately even race karts will understeer terminally when driven too slow or have cold tires, so if you're planning on driving in parking lots, etc, the problem will be even worse.

There is an old saying in racing, "power is nothing without control." I have a friend who bought a 40 HP shifter kart, he doesn't drive very well and the kart isn't set up very well, so at a given track I can do a faster lap time in 13 HP four-cycle kart. Unless you are drag-racing, you may be better trading off some of that power for Weight Reduction, this will make a better driving experience.

One more piece of food for thought, there is another old saying in racing: Horsepower sells motor cars, but torque wins motor races...

Take care!

With that out there I DO want to be able to turn and make it around the track, I dont want a pure drag racing kart. So the new goal is <400lbs, here is my proposed weights as weighed by bathroom scale:

Frame: 75lbs
Rims and Tires: 17.5lbs
Driver after -10lb diet) 180lbs
Side pods( batt mount) 5lbs
Misc 5lbs

TOTAL non-electrical 282.5lbs
Weight allotment electrical 117.5 lbs

So here is the challenging part. Proposed electrical allotment breakdown:

Batteries: 84 Haiyin Ultra Proforrmance 6ah 3.7v nom-- 103v Nom 18ah
This should give good current even at voltage drop to 3v
3v*28cells*18ah*33.33C = 50kw
( could have complete packs that could be changed at pit stop)
Battery pack wieght with pack construction materials 40lbs

Weight left for motor controller and wiring 77lbs

Solution Jr(maybe) 12lbs
wiring and Rev. cont 5.5lbs

So all I need is a magic 50lb 50kw motor. haha

This leaves 50lbs for a mean motor...Hmmmm? any Suggestions?

I put a request in with these guys anyone heard of them? http://www.plumquick.com

Thanks,

Brock
www.winzeracer.com

[Ziggythewiz]

Those are some tight margins. You may need some low-carb engineering to get that thing under spec!

[somanywelps]

Drop to 7" motors?

[MN Driver]

Originally Posted by somanywelps

Drop to 7" motors?

The D&D ES-31B is a 6.7" motor. It's really long proportionately at 15" though. I think the Warp Impulse 9 is an inch shorter as a comparison. Kostov 9's are 14" too, again only mentioning this as a comparison.

[Yabert]

Originally Posted by winzeracer

So all I need is a magic 50lb 50kw motor. haha

This leaves 50lbs for a mean motor...Hmmmm? any Suggestions?

Do you have a large budget?

Dual Agni 95R can be awesome but pricey: http://www.electricmotorsport.com/st..._agni_b95r.php
Or maybe abuse from a single Agni 111R: http://endless-sphere.com/forums/vie...440&hilit=agni

[winzeracer]

Originally Posted by Yabert

Do you have a large budget?

Dual Agni 95R can be awesome but pricey: http://www.electricmotorsport.com/st..._agni_b95r.php
Or maybe abuse from a single Agni 111R: http://endless-sphere.com/forums/vie...440&hilit=agni

Wow Yabert that agni 111rdr is a killer and only 26lbs! Just need to squeeze the nearly $3k price into the budget, I think one of these would be better and easier install than dual 95r's. Thanks for the info. Still waiting to see what plumquick says.