R/C Tech Forums

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

Like Tree24Likes
Reply
 
Thread Tools Search this Thread
Old 10-25-2011, 09:03 AM   #1171
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by Slash'em1 View Post
Its a good day fellas! I just got my kit today and hopfully will be starting the build tonight. Has any thought about using RMP ballcups? I never had a issue with them on my B44. I'm thinking I should just get new ones before I start the build. I just want to make sure I get something that will work.
Im not sure they will work with the larger metric ball studs.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 10-25-2011, 09:06 AM   #1172
Tech Adept
 
Slash'em1's Avatar
 
Join Date: Jun 2010
Location: Pecatonica, IL
Posts: 226
Trader Rating: 3 (100%+)
Default

Quote:
Originally Posted by Cpt.America View Post
Im not sure they will work with the larger metric ball studs.
Yea they might not work either. I have some so I will try them when I start my build. It might be a waste of time but what do I have to lose.
Slash'em1 is offline   Reply With Quote
Old 10-25-2011, 09:18 AM   #1173
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Amainhobbies shows this kit in stock right now.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 10-25-2011, 10:00 AM   #1174
Tech Champion
 
Jmuck69's Avatar
 
Join Date: Jan 2010
Location: Atlanta, GA.
Posts: 5,003
Trader Rating: 12 (100%+)
Default

Quote:
Originally Posted by Cpt.America View Post
Definitly

Me too.. My car had TONS of steering last night, even with the locked in rear-end


Motor config first, as you have to have that set when building the car. Choose this based on whether you like a darty car, or a more planted car, and from how much traction you track has in general. If your track has a LOT of traction, tire spin might not be an issue, and 3 gear might feel better. If you fight rear tire spin as I do, RM4 might be a better way.
I was thinking since it's very simple to flip the motor around that it can be done at the track to help tune. My home track is high grip so the 3 gear is the way to go but another track I go to in the area is low to med grip so the 4 gear might be the ticket.
__________________
B6D | B64D

Schelle Racing Concepts - www.schelleracing.com
Amain Hobbies - www.amain.com
Jmuck69 is offline   Reply With Quote
Old 10-25-2011, 10:06 AM   #1175
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by Jmuck69 View Post
I was thinking since it's very simple to flip the motor around that it can be done at the track to help tune. My home track is high grip so the 3 gear is the way to go but another track I go to in the area is low to med grip so the 4 gear might be the ticket.
Very simple? If you say so.... You'd have to rebuild the rear-end, and rewire the entire car.... That may be simple , but not something I like to do over and over.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 10-25-2011, 11:47 AM   #1176
Tech Elite
 
Join Date: May 2010
Posts: 3,842
Trader Rating: 19 (100%+)
Default

Quote:
Originally Posted by Cpt.America View Post
Very simple? If you say so.... You'd have to rebuild the rear-end, and rewire the entire car.... That may be simple , but not something I like to do over and over.
I have yet to try it, but when I wired Cush's car I tried to make the motor wires so that they would reach to the other side so we can flip the motor if desired. It helps that we have a Speed Passion motor in it with bullet plugs that just slide off, but I'm confident it can be done. All you would need to do is rebalance the car if you have added weight as the motor would sit just off to the other side.
__________________
Serpent America/Desoto Racing- www.serpentamerica.com
TrakPower Speed Equipment- www.trakpowerusa.com
B Fast RC Performance- www.bfastrc.com
Futaba | Strictly R/C- Norridge, IL
Thank you all for the help and support!
Jonny5 is offline   Reply With Quote
Old 10-25-2011, 11:56 AM   #1177
Tech Champion
 
Jmuck69's Avatar
 
Join Date: Jan 2010
Location: Atlanta, GA.
Posts: 5,003
Trader Rating: 12 (100%+)
Default

Quote:
Originally Posted by Jonny5 View Post
I have yet to try it, but when I wired Cush's car I tried to make the motor wires so that they would reach to the other side so we can flip the motor if desired. It helps that we have a Speed Passion motor in it with bullet plugs that just slide off, but I'm confident it can be done. All you would need to do is rebalance the car if you have added weight as the motor would sit just off to the other side.
maybe not, the motor looks to be centered in the chassis.
__________________
B6D | B64D

Schelle Racing Concepts - www.schelleracing.com
Amain Hobbies - www.amain.com
Jmuck69 is offline   Reply With Quote
Old 10-25-2011, 11:56 AM   #1178
Tech Adept
 
Join Date: Jan 2007
Posts: 221
Default

Quote:
Originally Posted by Cpt.America View Post
In a 3 gear config, the motor spins backwards. When the motor spins backwards, it makes the car attached to it spin the opposite direction, which is forward. forward rotation of the chassis means more pressure on the front tires, and less on the rear

In a 4 gear config, the opposite happens. The motor spins forward, which makes the chassis rotate backwards, which means less pressure on the front tires, and more on the rear tires.

So in both configs the car squats on-throttle, but there is a slight pressure bias towards the front tires in 3 gear, and a slight bias towards the rear tires with the 4 gear.
So staying on this topic with MM4 setup the motor would spin forward making the chassis rotate backwards, however since you are still using 4 gears you would still maintain the pressure on the rear tires while adding more front tire pressue due to the mid-motor placment??

So MM4 could potentialy give you better grip?
JayBuc is offline   Reply With Quote
Old 10-25-2011, 11:59 AM   #1179
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by Jonny5 View Post
I have yet to try it, but when I wired Cush's car I tried to make the motor wires so that they would reach to the other side so we can flip the motor if desired. It helps that we have a Speed Passion motor in it with bullet plugs that just slide off, but I'm confident it can be done. All you would need to do is rebalance the car if you have added weight as the motor would sit just off to the other side.
yeah, that would make it nice and easy. I always cut my wires so they are as lean and measured as possible
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 10-25-2011, 12:00 PM   #1180
Tech Elite
 
Join Date: May 2010
Posts: 3,842
Trader Rating: 19 (100%+)
Default

Quote:
Originally Posted by Jmuck69 View Post
maybe not, the motor looks to be centered in the chassis.
Its very close, but I think its 2-3 mm offset. Now I have to measure when I get home...
__________________
Serpent America/Desoto Racing- www.serpentamerica.com
TrakPower Speed Equipment- www.trakpowerusa.com
B Fast RC Performance- www.bfastrc.com
Futaba | Strictly R/C- Norridge, IL
Thank you all for the help and support!
Jonny5 is offline   Reply With Quote
Old 10-25-2011, 12:21 PM   #1181
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -

Last edited by Cpt.America; 12-03-2012 at 03:23 PM.
Cpt.America is offline   Reply With Quote
Old 10-25-2011, 12:33 PM   #1182
Tech Adept
 
Join Date: Jan 2007
Posts: 221
Default

Quote:
Originally Posted by Cpt.America View Post
The topic was actually RM4.

It doens't really help in the scheme of communication to say things like "better grip". you have to define what type of grip you are trying to qualify and quantify. In this scenerio, we are talking about Rear tire straight line grip, on-throttle. It's important to qualify that. The motor hanging out the end of an RM car ads leverage to the weight that sits on the back tires. Motor placement is going to have a larger affect on which tires are receiving weight than which direction the motor is spinning.

On an extreme grip track, like astroturf, Rear tirespin is never an issue, and forward (rear tire on throttle) grip is always abundant... so a mid motor car, will excel. This is because a mid motor car is better balanced front and back, so it will be better in the corners. But on a dirt track, where forward traction is limited, the forward traction that is missing from the mid motor car will keep you from being able to get hard on the gas. Tire spin will keep your lap times up. The rear motor car, with more weight leverage over the rear axle, will have better forward grip.
Got all that..good break down by the way! Thanks! but that is where the 4 gear plays into this. As stated before...4 gear setup would help you maintain that back tire pressure even with a mid-motor configuration right?
JayBuc is offline   Reply With Quote
Old 10-25-2011, 12:44 PM   #1183
Tech Elite
 
Glowster21's Avatar
 
Join Date: Mar 2005
Posts: 3,492
Trader Rating: 116 (100%+)
Default

Guys, any of you running the actual kit 6 hole pistons? I want to try those and also close up some holes on the 2nd set of 6 holes it comes with, any particular pattern I should close off to go from 6 to 4 holes?
Glowster21 is offline   Reply With Quote
Old 10-25-2011, 01:02 PM   #1184
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by JayBuc View Post
Got all that..good break down by the way! Thanks! but that is where the 4 gear plays into this. As stated before...4 gear setup would help you maintain that back tire pressure even with a mid-motor configuration right?
yes, exactly. So in order from the most "rear tire"/"forward" (on throttle) traction to the least, would look like this:

RM4
RM3
MM4
MM3
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 10-25-2011, 01:05 PM   #1185
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by Glowster21 View Post
Guys, any of you running the actual kit 6 hole pistons? I want to try those and also close up some holes on the 2nd set of 6 holes it comes with, any particular pattern I should close off to go from 6 to 4 holes?
I am running 6 hole pistons, with 1.2s in front, and 1.3s in the rear, but will be swapping them for this coming weekend race with a large change in oil weights.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
St Ives RC Club B4Bandit Australian Racing 16564 08-19-2017 05:06 AM
EPMTs check in here. (a subsidiary of TNT) overtki11 Singapore R/C Racers 55470 05-07-2017 11:57 PM
Team Durango DEX410 ASH93A Australian Racing 925 04-08-2013 09:51 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 06:16 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net