R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 10-10-2009, 04:51 PM   #1
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default im looking for speed

ok i have a 10 scale exceed on road car with a gtb 5.5t brushless system. i got the stock gearing. 58t spur gear and a 26t pinion. i dont know what pitch but its either 32 or a 48.

i got a crappy 6s 2000 nimh battery. i punch the charge up to 1.4v per sell. and it gets the job done. don't know actual mph. car is shaft driven to

i want to get really fast. like 70 mph. what do i need to reach that speed. i mean everything i need. motor, esc, battery, gears, whatever. also why these 200+ 10 scale esc so limited. like only being able to use 2s lipos. but a plane or boat esc for 70+ plus dollars handles 6s lipos
bernyberns is offline   Reply With Quote
Old 10-10-2009, 05:25 PM   #2
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default

guess no one likes to go fast
bernyberns is offline   Reply With Quote
Old 10-10-2009, 05:52 PM   #3
Tech Addict
 
Jackster's Avatar
 
Join Date: Aug 2009
Location: Northern VA
Posts: 646
Trader Rating: 19 (100%+)
Default

Frankly, that gear ratio sounds like a melted system waiting to happen.
Jackster is offline   Reply With Quote
Old 10-10-2009, 05:54 PM   #4
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by Jackster View Post
Frankly, that gear ratio sounds like a melted system waiting to happen.
y is that? thats to much for the gtb?. also my gtb never ever get hot. barley even warm
bernyberns is offline   Reply With Quote
Old 10-10-2009, 07:17 PM   #5
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default

anyone?? no one goin even 60 mph in here??
bernyberns is offline   Reply With Quote
Old 10-10-2009, 07:56 PM   #6
Tech Master
 
Danny-b23's Avatar
 
Join Date: Feb 2009
Location: Saskatoon, SK, Canada
Posts: 1,336
Trader Rating: 3 (100%+)
Default

Get a ESC with timing advance, like the Speed Passion GT2.0, a good durable servo like the Futaba 9551, a 3.5 Brushless motor, and get a high mAh pack.

Car, you might want to go with a 10th scale pan car, like the BMI DB10RR. With that you can then get a Can-Am body for really good downforce. Mon-Tech makes a GHIBLI that would be perfect for high speed.
__________________
RC America|XRAY|ORCA|Motiv|EA Motorsports
Danny Buck
WCICS Rep - Round 1, Saskatoon, SK
Danny-b23 is offline   Reply With Quote
Old 10-11-2009, 06:07 AM   #7
Tech Champion
 
abailey21's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2007
Location: SoCal
Posts: 5,224
Trader Rating: 36 (100%+)
Default

Quote:
Originally Posted by bernyberns View Post
anyone?? no one goin even 60 mph in here??
Your best bet is look at the ISTC website and forums, these are racers in here for the most part, not bashers or speed runners.

The ISTC is ALL speed runners!
__________________
K.C.C.O.
abailey21 is offline   Reply With Quote
Old 10-11-2009, 07:56 AM   #8
Tech Addict
 
PaPeRo's Avatar
 
Join Date: Aug 2009
Posts: 692
Default

You'll probably need a motor that could handle 3S LiPo minimum. From there it's just getting the appropriate ESC, gearing and battery. Battery should be able to output 70A+ so probably a 30C rated pack.

Mamba 5700kv + 3S 5000mah 30C LiPo should get you beyond 70mph if your car is able to stay on the ground. The Traxxas Bandit VXL is capable of 70mph out of the box and it's only using a 3500kv motor.
PaPeRo is offline   Reply With Quote
Old 10-11-2009, 08:24 AM   #9
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default

thank you guys. i will check out that other forum also. guess ill be selling some of the stuff i got now
bernyberns is offline   Reply With Quote
Old 10-11-2009, 08:29 AM   #10
Tech Apprentice
 
Join Date: Sep 2009
Posts: 76
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by PaPeRo View Post
You'll probably need a motor that could handle 3S LiPo minimum. From there it's just getting the appropriate ESC, gearing and battery. Battery should be able to output 70A+ so probably a 30C rated pack.

Mamba 5700kv + 3S 5000mah 30C LiPo should get you beyond 70mph if your car is able to stay on the ground. The Traxxas Bandit VXL is capable of 70mph out of the box and it's only using a 3500kv motor.
now thats what im talking about lol. thankx for the basic guideline. my car came stock with a 75a brushless esc and a 3300kv motor. its can handle 3s lipos. i think im very limited when it comes to gearing though. for the exceed cause they only have one size spur gear. least that i could find. looking for a new car now
bernyberns is offline   Reply With Quote
Old 10-12-2009, 11:40 AM   #11
Tech Fanatic
 
b4maz's Avatar
 
Join Date: Aug 2006
Location: Houston, TX
Posts: 928
Trader Rating: 8 (90%+)
Default

Take a look at this calculator I wrote. It will help you figure out what kind of power you will need:

http://www.scriptasylum.com/rc_speed/_speed_amp.html

Vehicle Weight (lbs): 5
Vehicle Width (in): 8
Vehicle Height (in): 4
Pinion Tooth Count: 26
Spur Tooth Count: 58
Transmission Ratio: 2.3
Differential Ratio: 1
Other Ratio: 1
Tire Diameter (inches): 2.5
Tire Ballooning (in): 0
Drag Coefficient: 0.35
Total Voltage: 6
Electrical Efficiency: 85
Target Top Speed (mph): 70
Time to Get to Top Speed: 7
Usable Output Power: 452.91 watts (0.61 HP)
Input Power Required: 710.44 watts (0.95 HP)
Input Current Required: 118.41 amps
Motor Torque: 0.1 ft-lbs
Axle Torque: 0.53 ft-lbs
Average Acceleration: 4.47 inches/sec
Acceleration Force: 10.14 meters/sec^2
Acceleration Gs: 0.46 G
Required Motor RPM: 48290 rpm
Required Motor KV: 8048
KT constant: 0.17 oz-in/A

The ISC website is here. Make sure your car isnt ugly, or they wont accept it in their "speed database".
__________________
Tons of speed run videos and information:
www.fastestrc.blogspot.com/
b4maz is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for a Wicked fast Nitro RoseTuned Nitro On-Road 12 10-11-2007 03:28 PM
xbox, games, xxx, servo+ more for trade..looking for 1/8 [email protected] R/C Items: For Sale/Trade 6 08-19-2003 03:31 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 06:14 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net