R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 08-16-2014, 09:35 AM   #1
Tech Initiate
 
Join Date: Mar 2012
Posts: 20
Default Anyone have a good carpet vta setup for a jrxs-r

I am in the process of rebuilding a jrxs-r and could use a decent starting point for vta on carpet thanks a lot!
Dirtcar75 is offline   Reply With Quote
Old 08-16-2014, 12:39 PM   #2
Tech Elite
 
Potoczak's Avatar
 
Join Date: Oct 2009
Location: PA
Posts: 3,609
Trader Rating: 112 (100%+)
Default

Quote:
Originally Posted by Dirtcar75 View Post
I am in the process of rebuilding a jrxs-r and could use a decent starting point for vta on carpet thanks a lot!
I'm sure you can find something on petitrc.
__________________
Pete Potoczak

Home entertainment specialist
Secure Technologies/ www.stiworldwide.com
Potoczak is offline   Reply With Quote
Old 08-16-2014, 02:32 PM   #3
Tech Initiate
 
Join Date: Mar 2012
Posts: 20
Default

I have looked there is nothing vta specific i know the vta tires are going to play a huge roll in how the needs to be set up i figure someone has to be running one still they were a pretty good car for the day
Dirtcar75 is offline   Reply With Quote
Old 08-16-2014, 02:48 PM   #4
Tech Elite
 
DesertRat's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2011
Location: Sniffin the 'Sauce Fumes
Posts: 2,711
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by Dirtcar75 View Post
I have looked there is nothing vta specific i know the vta tires are going to play a huge roll in how the needs to be set up i figure someone has to be running one still they were a pretty good car for the day
A good setup for 17.5 is typically good for VTA, roll out and tires aside. Yeah VTA has less grip than proper touring car but a good balance is a good balance.
__________________
I race toy cars for fun. If I need to explain, you'll never understand.
Current rides: Diggity DC4 Chassis #10. Losi JRX-S Type R. Losi 22 4.0, CRC Xi (retired), CRC Altered Ego Aluminum Chassis. Associated B4 based dirt oval late model.
WTB: Carpet racing in Arizona.
DesertRat is offline   Reply With Quote
Old 08-16-2014, 03:54 PM   #5
Tech Elite
 
Potoczak's Avatar
 
Join Date: Oct 2009
Location: PA
Posts: 3,609
Trader Rating: 112 (100%+)
Default

Quote:
Originally Posted by DesertRat View Post
A good setup for 17.5 is typically good for VTA, roll out and tires aside. Yeah VTA has less grip than proper touring car but a good balance is a good balance.
+1. Whenever I setup Vta cars I use 17.5 setups.
__________________
Pete Potoczak

Home entertainment specialist
Secure Technologies/ www.stiworldwide.com
Potoczak is offline   Reply With Quote
Old 08-17-2014, 09:56 PM   #6
Tech Master
 
padailey's Avatar
 
Join Date: Nov 2005
Location: Council Bluffs, IA
Posts: 1,603
Trader Rating: 11 (100%+)
Default

For low to med traction guys at our track have used the kit foam setup with a lot of success. If traction is high enough (trans am nats) the car starts to traction roll we reduce the springs to 15 front 12 rear (some have used 12 and 10) lighten the oil in the shocks and take all the screws out of the top deck but the front and rear. There may be a few other changes we made but I don't have the car anymore and gave away my setup sheets. However my buddy runs the foam setup and is right at the front all the time with the car.
__________________
www.hobbyplexraceway.com

Tamiya TRF417X (Lion's Automotive GTR)
Tamiya TRF416X
Tamiya F104W MP6/4 converted to F104X1 (Renault R30)
padailey is offline   Reply With Quote
Old 08-17-2014, 10:29 PM   #7
Tech Elite
 
DesertRat's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2011
Location: Sniffin the 'Sauce Fumes
Posts: 2,711
Trader Rating: 2 (100%+)
Default

I have not raced my JRX-S Type R in VTA or USGT, but like I said before the 17.5 turn setup I run shouldn't be too bad. I'll see what I can remember:

FRONT:

Roll Center: Arms mounted on the low roll center setting, close to the chassis. Front stock links, mounted in either the upper or lower inner link position on the tower.

Alignment: 1 or 2 degrees of camber, a degree or so of toe out.

1 or 2 mm of droop from ride height.

Shocks: 35 weight fluid with Losi #56 piston, 17.5 pound spring, middle or inner hole on the shock tower.

Swaybar: Medium-Hard swaybar.

Diff: SPOOL


REAR:

Roll-Center: Arm mounted low, like the front. Long link, outer hole on the hub, middle inner hole on the shock tower.

Alignment: 2 degrees of camber

1.5-2mm of droop from ride height.

Shocks: 30 or 35 weight with Losi 56 piston, 12.5 pound spring, inner hole on the arm and middle or inner hole on the tower.

Swaybar: Medium-Soft.

Diff: just tight enough to not slip under power

+1 degree rear hubs for 3 degrees total rear toe-in.




I run a shorty lipo pack and mount the ESC in the battery tray behind it. I also run the steel battery tray to get the extra ballast and make weight. This makes the car very, very stiff but I never found much advantage in softening the chassis, i would rather have the flex in the suspension. Under high grip this setup I listed is very soft and may allow the side of the chassis to drag, if this happens I found that moving the swaybar ball mounts up the bar to make it harder solves most of the problem.

How good was this car? I came within two corner dots of TQ'ing and winning this race, my car is orange/yellow:

http://www.youtube.com/watch?v=PJIfZ...vH2xGlHKW-NGDQ

The guy who beat me was a better driver than me, I had the superior car through most of the day.

A month after that race, and the very next time I put the car on the track, I TQ'd with the Type R at TQRC in California, ran fast lap of 17.5 touring at the event, but I had some bad luck with lapped traffic in the main.

Some pictures from another thread:

http://www.rctech.net/forum/electric...tively-14.html
__________________
I race toy cars for fun. If I need to explain, you'll never understand.
Current rides: Diggity DC4 Chassis #10. Losi JRX-S Type R. Losi 22 4.0, CRC Xi (retired), CRC Altered Ego Aluminum Chassis. Associated B4 based dirt oval late model.
WTB: Carpet racing in Arizona.
DesertRat is offline   Reply With Quote
Reply



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 03:17 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