R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 01-12-2009, 12:35 PM   #6751
Moderator
 
Clegg's Avatar
 
Join Date: Jan 2004
Location: Outside doing things in places... Denver, CO
Posts: 4,608
Trader Rating: 9 (100%+)
Default

Oh and here is the updated setup that I ran yesterday. I did need more negative camber for some of the higher speed sweepers we have, but that was about the only real change I made.
Attached Files
File Type: pdf Joe-db12rr-setup1.pdf (151.3 KB, 140 views)
__________________
Joe Kelly - JK720.net
5280 Raceway |5280raceway.com | 5280 Raceway Facebook
Clegg is offline   Reply With Quote
Old 01-12-2009, 12:36 PM   #6752
Tech Rookie
 
lyoha's Avatar
 
Join Date: Dec 2008
Location: Moscow, Russian Federation
Posts: 17
Default

Please optimal gear ratio for the modified motor for 3.7. And what the motor used in modified?
__________________
Tamiya TRF-416WE - Speed Passion GT V2.0 - EPIC 10.5
BMI12RR - Sphere SSX - Vector X12 4.0
CRC Gen-X - Speed passion GT - Orion Vortex 5.5
Futaba T3VCS 2.4 FASST
lyoha is offline   Reply With Quote
Old 01-12-2009, 12:37 PM   #6753
Moderator
 
Clegg's Avatar
 
Join Date: Jan 2004
Location: Outside doing things in places... Denver, CO
Posts: 4,608
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by protc3 View Post
I am about to do some lipo testing with the 3.7 lipo. I am going to try this setup


Front

5 degree blocks with 4 degree castor
.020 front spring w/ #3 on the kingpins
angled servo
2x pink fronts cut to 1.700 1/2 inside sauce
2 degrees camber
0 toe
3.5mm ride height
.25mm droop

Rear
lipo back as far as possible
Thin flex plates in long position w/ set screw installed but not touching chassis
#3 in the tubes
Gold spring w/ 50 wt. oil in the silva shock
Tall ballstud on shock mount
2 x pink rear tire cut to 1.800
1mm pod droop
3.5mm ride height
pod level

I will see how this runs and let you know.
Any reason you are going with the angled servo and not flat for the LiPo testing?

Cant wait to hear how it works!
__________________
Joe Kelly - JK720.net
5280 Raceway |5280raceway.com | 5280 Raceway Facebook
Clegg is offline   Reply With Quote
Old 01-12-2009, 01:40 PM   #6754
Tech Lord
 
protc3's Avatar
 
Join Date: Jun 2003
Location: Spring Hill,Florida
Posts: 10,829
Trader Rating: 13 (100%+)
Default

I always start with the angled mounts for the most aggressive feel. I will tone it down if i need to.
__________________
Jason Breiner
BMI Racing
Team Associated
J Concepts
protc3 is offline   Reply With Quote
Old 01-12-2009, 02:02 PM   #6755
Tech Addict
 
Join Date: Feb 2007
Posts: 596
Default

anyone had problems with the motor moving forwards in a shunt ?

I've had this a couple of times now and I can't work out what it is.
__________________
CPD Racing
chris_dono is offline   Reply With Quote
Old 01-12-2009, 02:09 PM   #6756
Moderator
 
Clegg's Avatar
 
Join Date: Jan 2004
Location: Outside doing things in places... Denver, CO
Posts: 4,608
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by chris_dono View Post
anyone had problems with the motor moving forwards in a shunt ?

I've had this a couple of times now and I can't work out what it is.
I think I did in one of the qualifiers yesterday. mid way through the race I started hearing a bit of grind and pulled it in.. the motor still had mesh but not much and started taking the tops off the spur teeth. So I jammed it back together and all was good

I normally run my mesh a bit lose and that could have caused the teeth on the spur to wear and start to break a bit.
__________________
Joe Kelly - JK720.net
5280 Raceway |5280raceway.com | 5280 Raceway Facebook
Clegg is offline   Reply With Quote
Old 01-12-2009, 02:13 PM   #6757
Tech Addict
 
Join Date: Feb 2007
Posts: 596
Default

the spur was new that day and it's not damaged from what i can see

the motor has moved enough along the pod plate that the pinion is no longer in contact with the spur
__________________
CPD Racing
chris_dono is offline   Reply With Quote
Old 01-12-2009, 02:25 PM   #6758
Tech Elite
 
chris moore's Avatar
 
Join Date: Mar 2004
Location: Phx AZ
Posts: 3,746
Trader Rating: 85 (99%+)
Default

Quote:
Originally Posted by protc3 View Post
I am about to do some lipo testing with the 3.7 lipo. I am going to try this setup


Front

5 degree blocks with 4 degree castor
.020 front spring w/ #3 on the kingpins
angled servo
2x pink fronts cut to 1.700 1/2 inside sauce
2 degrees camber
0 toe
3.5mm ride height
.25mm droop

Rear
lipo back as far as possible
Thin flex plates in long position w/ set screw installed but not touching chassis
#3 in the tubes
Gold spring w/ 50 wt. oil in the silva shock
Tall ballstud on shock mount
2 x pink rear tire cut to 1.800
1mm pod droop
3.5mm ride height
pod level

I will see how this runs and let you know.

Are you doing this test on asphalt or carpet Jason?


Quote:
Originally Posted by chris_dono View Post
the spur was new that day and it's not damaged from what i can see

the motor has moved enough along the pod plate that the pinion is no longer in contact with the spur
If your motor has moved that much you must have hit a board/object square and hard or the motor screws are way loose. Another cause could be if your using a washer for the motor screws thats not metal. I used to use a plastic shim and it would slide if I hit something hard.
__________________
Sponsered by:

CMDezigns Paint Works
https://www.facebook.com/pages/CM-Dezigns/259989190822177?ref=hl
chris moore is offline   Reply With Quote
Old 01-12-2009, 02:27 PM   #6759
Tech Lord
 
protc3's Avatar
 
Join Date: Jun 2003
Location: Spring Hill,Florida
Posts: 10,829
Trader Rating: 13 (100%+)
Default

Quote:
Originally Posted by chris_dono View Post
anyone had problems with the motor moving forwards in a shunt ?

I've had this a couple of times now and I can't work out what it is.
This is caused from vibration from the motor. You can run a slight amount of blue locktight on the threads for the motor screws.
__________________
Jason Breiner
BMI Racing
Team Associated
J Concepts
protc3 is offline   Reply With Quote
Old 01-12-2009, 02:28 PM   #6760
Tech Champion
 
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,176
Default

in the year I've been running my DB12R I've only had that happen to me once. I just didn't have the screws tight enough.
InspGadgt is offline   Reply With Quote
Old 01-12-2009, 02:29 PM   #6761
Tech Addict
 
Join Date: Feb 2007
Posts: 596
Default

Quote:
Originally Posted by chris moore View Post
If your motor has moved that much you must have hit a board/object square and hard or the motor screws are way loose. Another cause could be if your using a washer for the motor screws thats not metal. I used to use a plastic shim and it would slide if I hit something hard.
That's what I thought, but they aren't loose at all. When i set the mesh up on the pinion I put one tooth higher and have it as close to the spur as it will go, then crank the motor screws tight.

I then change down 1 tooth on the pinion for a good mesh without moving the motor.

It's moved along the podplate without loosening the screws :S
__________________
CPD Racing
chris_dono is offline   Reply With Quote
Old 01-12-2009, 02:33 PM   #6762
Tech Lord
 
protc3's Avatar
 
Join Date: Jun 2003
Location: Spring Hill,Florida
Posts: 10,829
Trader Rating: 13 (100%+)
Default

Hmm, That doesnt sound right. If you like, You can send the car to me and i will get it squared away. I can send it back the same day it gets here. It shouldnt take long.
__________________
Jason Breiner
BMI Racing
Team Associated
J Concepts
protc3 is offline   Reply With Quote
Old 01-12-2009, 02:43 PM   #6763
Tech Addict
 
Join Date: Feb 2007
Posts: 596
Default

Quote:
Originally Posted by protc3 View Post
Hmm, That doesnt sound right. If you like, You can send the car to me and i will get it squared away. I can send it back the same day it gets here. It shouldnt take long.
I'm 95% sure it's me not the car Jason, but thanks for the offer. I'm racing a national this weekend otherwise I'd send it

I'm going to try a new set of pod plates this weekend and a different motor. I'm currently using cap head M3x6mm screws (2mm hex) to hold it in place, perhaps I should try a slightly longer screw and a washer to grip the podplate ?

Didn't see about loctite, will try that first
__________________
CPD Racing
chris_dono is offline   Reply With Quote
Old 01-12-2009, 03:07 PM   #6764
Tech Fanatic
 
fatbear's Avatar
 
Join Date: Nov 2003
Location: Perth, Western Australia
Posts: 811
Trader Rating: 10 (100%+)
Send a message via Yahoo to fatbear
Default

Jason, (or anyone for that matter) can you please explain what changing the front droop does for the cars handling.
ie; changing from 3 shims to 2 shims above the upper pivot ball.

Is there an optimum difference in tire dia from front to rear? Perhaps a ratio you can use like the rear tires are for example should be 1.05 times bigger than the fronts.
__________________
Team Associated www.teamassociated.com
Team Tekin www.teamtekin.com
B-Fast R/C Performance www.bfastrc.com
JConcepts www.jconcepts.net
Ace Hobby Distributors www.acehobbyaustralia.com
fatbear is offline   Reply With Quote
Old 01-12-2009, 03:22 PM   #6765
Tech Regular
 
Join Date: Aug 2007
Posts: 399
Default My New ride,ready to hit the track Sunday

Just completed the build 2 hours 40 mins and another 2 hours kit it out.What do you think guys.

BMI 12RR If it goes as well as it looks watch out.
Attached Thumbnails
BMI's DB12R-r0011085.jpg   BMI's DB12R-r0011086.jpg   BMI's DB12R-r0011090.jpg  
tellan is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
NEW IN BOX BMI DB12R bigb11 R/C Items: For Sale/Trade 47 10-09-2008 04:36 PM
-BMI DB12R- joey R/C Items: For Sale/Trade 11 05-18-2008 09:25 PM
BMI DB12R wallstreet R/C Items: For Sale/Trade 17 02-15-2008 05:04 PM
BMI DB12R D-Bizzle R/C Items: For Sale/Trade 2 12-21-2007 03:48 PM
WTB BMI DB12R chris moore R/C Items: Wanted to Buy 8 06-29-2007 06:25 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 04:23 AM.


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