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Old 02-09-2009, 08:17 AM   #1
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Default B4...lipo or not? (setup questions)

Ok, so I have an Associated B4 on the way. I was considering getting throwing a 2s lipo in it and a 5700kv mamba max. Now, my question is this….how fast would this thing be? I have an 18T with a 6800kv sidewinder, and 2s lipo, and it is RETARTED fast. Even when I use an 8.4v NiMh pack, it’s still REEALLY fast, almost too fast for racing.

So I’m trying to figure out WHICH Mamba to get for my B4, and if I should just stick with a good NiMh, or get a 2s lipo. But if I go lipo, I don’t want an overpowered Mamba. I’d like to keep the car on the track  So, I need to find a happy medium…I need either a mild mamba/lipo or a hotter mamba/nimh….any suggestions on a good setup? Which Nimh packs would you recommend for longest runtimes, etc.?
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Old 02-09-2009, 08:44 AM   #2
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I have a B4 with lipo and a 4600 motor. It has more power than I can drive right now.
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Old 02-09-2009, 08:48 AM   #3
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The 5700kV is overkill, the car is too light. You should read/post in this thread as there are plenty of B4's with Lipo.

http://www.rctech.net/forum/electric...-t4-forum.html
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Old 02-09-2009, 08:52 AM   #4
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Sounds like I should just go with a 4600kv and a 7.2 nimh huh? I don't want to do to this what I did with my RC18T. I created a monster with my 18T, it's so fast, I have to figure out how to tame it down so I can race it. I want a setup that is all USABLE power, but it still fast....not excessive unusable power.
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Old 02-09-2009, 09:16 AM   #5
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on my indoor/tight track a 10.5 w/ a hot pack, in truck or buggy pulls faster laps than a mod motor... mainly causes it's much more drivable...faster it not always faster! "Usable" is the key!
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Old 02-09-2009, 09:27 AM   #6
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Quote:
Originally Posted by speedsterblade View Post
on my indoor/tight track a 10.5 w/ a hot pack, in truck or buggy pulls faster laps than a mod motor... mainly causes it's much more drivable...faster it not always faster! "Usable" is the key!
That's what I'm aiming for! USABLE speed. Sure, I can hot rod it, and make cool speed run videos on YouTube, but who gives a crap about that?

I'm thinking I'm gonna go with the 4600kv, a nimh with big capacity mah-wise, and some modest gearing. I think I should have some good power, but be able to keep things under control. Whatcha think? I don't think Lipo is going to be necessary....
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Old 02-09-2009, 10:00 AM   #7
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I went through the same learning curve that you are going through right now. I started with the 18T mamba 6800 combo and it was too fast for me to race also. I have a b4 with a CC 5700 in it and I run a 2 cell lipo. I find that with so much power it's hard to keep the rear planted and the rear tires from becomming pizza cutters. I am by no means an experienced racer and maybe someone with more skill could drive this set-up fast. I have started setting the speed control to it's lowest settings with as much punch control as I can get and its getting better, time will tell. I just rebuilt the diff and am running it loose to try and put more usable power to the ground.
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Old 02-09-2009, 10:17 AM   #8
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Correct! That is where I am. I am 26 and haven't raced in 10 years. So I am just getting back into with a more mature mentality. It's all about the tortise and the hare. I just so happen to want a fast tortise if that makes any sense. I want to do my B4 the RIGHT way and make it fast, with USUABLE power, but be able to keep it under control on the track with my "rookie" skills.
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Old 02-09-2009, 10:29 AM   #9
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Use a Novak or LRP speed control and a sensored brushless motor.
A 2 cell lipo and you will love it and have almost zero maintenance.

If your going to race start with a 10.5 motor.
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Old 02-09-2009, 10:37 AM   #10
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Use a Novak or LRP speed control and a sensored brushless motor.
A 2 cell lipo and you will love it and have almost zero maintenance.

If your going to race start with a 10.5 motor.
So are you saying the 4600kv Mamba Max would be overkill? I'm going to be running it on Nimh to sort of tone it down a little...plus I can always gear it down.
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Old 02-09-2009, 10:44 AM   #11
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According to Castle's site...running Nimh with this 4600kv, it should only be about 25mph....

That's a little on the slow side, I mean, I'm not a total rook, I can drive. I just dont want to be hitting 45+ mph on the straight yet.
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Old 02-09-2009, 10:56 AM   #12
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Castle Creations is NOT a good racing speed control!
Novak, Tekin,or LRP . Usable controllable power is what you want.

Look around at race results, Who wins with a mamba?
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Old 02-09-2009, 11:15 AM   #13
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Quote:
Originally Posted by chedda bob View Post
Castle Creations is NOT a good racing speed control!
Novak, Tekin,or LRP . Usable controllable power is what you want.

Look around at race results, Who wins with a mamba?
Hell if I know. Any suggestions? Maybe an LRP/Reedy setup?
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Old 02-09-2009, 11:28 AM   #14
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Quote:
Originally Posted by chedda bob View Post
Castle Creations is NOT a good racing speed control!
Novak, Tekin,or LRP . Usable controllable power is what you want.

Look around at race results, Who wins with a mamba?
You know, on 2nd thought. I would say that is an almost unaccurate statement. Granted it's your opinion, and you are entitled to it, I don't see any problem with getting a Castle setup, proper gearing, battery setup, and maybe even the Castle Link and setting this thing up to where I can make it work just fine. I think anyone with patience and a little knowledge can make it work, as long as I don't get carried away.
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Old 02-09-2009, 11:35 AM   #15
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So with all this being said..I am going to get the 4600kv Mamba Max, and run it on a NiMh pack.

Here's the million dollar question...

what gearing should I use? I want to start out with a good ballpark. Suggestions?
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