R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 10-28-2012, 08:07 AM   #406
Tech Master
 
Join Date: Oct 2011
Location: Boulder, CO
Posts: 1,735
Trader Rating: 15 (100%+)
Default

Quote:
Originally Posted by bigtee View Post
xti car is twitchy in turns rear come around s/r on radio 76%, steering travel 80%, expo 34%, servo speed 88%. do i need to dial more steering out of the radio or change set up in car?
Make sure the car isn't tweaked, and then adjust how much front to rear bias you have via springs, front dope amount, ride height, pod droop, etc.

How much of the front tire are you doping and what tire compounds are you using?
__________________
Chris Hillier | 5280 Raceway | www.5280raceway.com | Racing. Elevated.

Destiny | LRP America | Protoform | Xenon/JFT | Gravity RC | Motiv | Sanwa | Max.FX
LloydLoar is offline   Reply With Quote
Old 10-28-2012, 08:17 AM   #407
Tech Addict
 
Join Date: Nov 2010
Posts: 619
Default

Quote:
Originally Posted by LloydLoar View Post
Make sure the car isn't tweaked, and then adjust how much front to rear bias you have via springs, front dope amount, ride height, pod droop, etc.

How much of the front tire are you doping and what tire compounds are you using?
side springs just touch; ride height front 3mm middle 3.5mm rear at 3.5mm rear pod at 3mm i dope the whole front tires.
bigtee is offline   Reply With Quote
Old 10-28-2012, 09:12 AM   #408
Tech Elite
 
303slowdown's Avatar
 
Join Date: Sep 2008
Location: Rapid City SD.
Posts: 2,188
Trader Rating: 19 (100%+)
Default

A little bit of preload on the side springs can calm a car down also back down the dope on the fronts to 1/2 to 3/4 ,going to long arm or raising the upper arm with the new roll center shims would help calm the front end down.
__________________
Ryan Borgheiinck
303slowdown is offline   Reply With Quote
Old 10-28-2012, 10:41 AM   #409
Tech Regular
 
jarrodh's Avatar
 
Join Date: Dec 2005
Location: victoria,bc.Canada
Posts: 315
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by jarrodh View Post
im goin to be testin out the theory this weekend.. hopefully it works aswell as it does in my head..

and save the rear axle bearings
it worked great, didnt kill a single bearing..

but now my esc packed it in.. i cant catch a frekin break.. fix one problem, 2 more pop up..

so far, new car, new battery, new voltage booster, replaced rx the second night, fixed the bearing issue, replaced the sensor wire and new motor 3rd night, now i might need a new tekin?..

im done spending money on this thing.. it can just sit on the shelf for a while now..
__________________
www.irocc.ca
jarrodh is offline   Reply With Quote
Old 10-28-2012, 10:57 AM   #410
Tech Master
 
Join Date: Jul 2011
Location: Austin, TX
Posts: 1,117
Trader Rating: 13 (100%+)
Default

Quote:
Originally Posted by bigtee View Post
xti car is twitchy in turns rear come around s/r on radio 76%, steering travel 80%, expo 34%, servo speed 88%. do i need to dial more steering out of the radio or change set up in car?
A racer at our local track was having issues with his sedan being way too twitchy... turned out he had +30% st expo.

If you are having to run negative 34% expo, something is probably wrong with the setup... If you are running positive expo... well that is just a mistake.
JamesL_71 is offline   Reply With Quote
Old 10-28-2012, 08:49 PM   #411
Team EAM
 
EAMotorsports's Avatar
 
Join Date: Dec 2001
Location: Murfreesboro, TN
Posts: 8,863
Trader Rating: 73 (100%+)
Send a message via AIM to EAMotorsports
Default

Quote:
Originally Posted by JamesL_71 View Post
A racer at our local track was having issues with his sedan being way too twitchy... turned out he had +30% st expo.

If you are having to run negative 34% expo, something is probably wrong with the setup... If you are running positive expo... well that is just a mistake.
Really depends on how you want the car to feel. Ive never seen anyone run positive expo on purpose though.

Paul Lemieux commonly runs -20 to -30 Expo on his 12th and TC though.

EA
__________________
Contact Us
Team EAM, Our Facebook
Xray | RCAmerica | Hudy | Apex RC | ProSpec America | Killer Concepts | AVID | Futaba.
EAMotorsports is offline   Reply With Quote
Old 10-28-2012, 11:00 PM   #412
Tech Addict
 
Join Date: Nov 2010
Posts: 619
Default foam bumper for xti

does anybody know what foam bumper Andrew Knapp use on the xti ? it seem that bumper goes around the front end pretty good. i been using team associated for their 1/12 scale doesn't do much too protect the corner of the front chassis for i broke mine in crash right where the front body mount mounts. now i have to get a new chassis.
bigtee is offline   Reply With Quote
Old 10-28-2012, 11:57 PM   #413
Tech Adept
 
FaanP's Avatar
 
Join Date: Jul 2010
Location: South Africa
Posts: 176
Default

There is some new option option parts for the Xti available on their site.
__________________
When in doubt - GAS IT!!
FaanP is offline   Reply With Quote
Old 10-29-2012, 03:21 AM   #414
Tech Elite
 
andrewdoherty's Avatar
 
Join Date: Jan 2005
Location: ★Wylie, TX★
Posts: 3,763
Trader Rating: 47 (100%+)
Default

Anyone know where to buy a Sanwa SRG-HR to be shipped to the US? My LHS can not get them, and everywhere I know to look online either doesn't carry it or is out of stock with no ETA.
__________________
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
|◤Hobbywing◢|◤SpeedzoneUSA.com◢|◤Pro-One◢|
|◤ReflexRacing.net◢|◤Protoform◢|◤AVID R/C◢|
andrewdoherty is offline   Reply With Quote
Old 10-29-2012, 04:18 AM   #415
Tech Elite
 
mike ivy's Avatar
 
Join Date: Feb 2002
Location: Comin at ya from a distant galaxy
Posts: 2,784
Trader Rating: 50 (100%+)
Default

Hello Andrew,

I think this might be it under the airtronics name.

http://www3.towerhobbies.com/cgi-bin...&I=LXJTU7&P=SM

hope this helps
Mike




Quote:
Originally Posted by andrewdoherty View Post
Anyone know where to buy a Sanwa SRG-HR to be shipped to the US? My LHS can not get them, and everywhere I know to look online either doesn't carry it or is out of stock with no ETA.
__________________
[-eXpress motorsports-] [-TQ Wire-]

1/12th Fo' Life!!! R.I.P Mike Reedy, R.I.P John Williams

[-Horsham RC-] [-Jackson RC-] [-RC Car World-] [ Black Out Free 2015 ]
mike ivy is offline   Reply With Quote
Old 10-29-2012, 08:04 AM   #416
Tech Master
 
big_ads's Avatar
 
Join Date: Jan 2009
Location: Benedict ND
Posts: 1,909
Trader Rating: 74 (100%+)
Send a message via MSN to big_ads
Default

Quote:
Originally Posted by JamesL_71 View Post
A racer at our local track was having issues with his sedan being way too twitchy... turned out he had +30% st expo.

If you are having to run negative 34% expo, something is probably wrong with the setup... If you are running positive expo... well that is just a mistake.
Depends on what radio you are using though too. The futaba is negative to slow the initial reaction, but on the older Spektrum radios (dont know about the newer ones) it was positive expo to slow the initial reaction.
__________________
Adam Balk
Northern Mini Racers (www.facebook.com/groups/northernminiracers/)
Team CRC - Team Genesis R/C Products - Motiv R/C - Big Head Racing - Team PRCP
big_ads is offline   Reply With Quote
Old 10-29-2012, 08:29 AM   #417
Tech Addict
 
Join Date: Sep 2010
Location: Aurora, CO
Posts: 745
Trader Rating: 38 (100%+)
Default

Quote:
Originally Posted by big_ads View Post
Depends on what radio you are using though too. The futaba is negative to slow the initial reaction, but on the older Spektrum radios (dont know about the newer ones) it was positive expo to slow the initial reaction.
Yes, I found this out the hard way when I switched from Spektrum to Futaba on my airplanes. For cars I've never used Expo but it's always safest to verify that the radio adjustment you just made did what you were expecting it to.
__________________
John Barr
On-Road: VBC WildFireD08; VBC Lightning10; VBC Lightning12; VBC Lightning10-235mm
Off-Road: Not likely
Special thanks to EMRFactory and VBC Racing.
linkless is offline   Reply With Quote
Old 10-29-2012, 08:53 AM   #418
Tech Master
 
locked's Avatar
 
Join Date: Mar 2010
Location: Toronto
Posts: 1,758
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by andrewdoherty View Post
Anyone know where to buy a Sanwa SRG-HR to be shipped to the US? My LHS can not get them, and everywhere I know to look online either doesn't carry it or is out of stock with no ETA.
RC mushroom sells it, but they are out of stock. I think you are probably looking for model number 94971.
http://www.rc-mushroom.com/product_i...ducts_id=21691

LRP says they have some, but I don't know how you are supposed to order from their site. The online shop seems to just be in German. I was able to find the sanwa servos section, but this one wasn't there.??
http://www.lrp.cc/en/products/sanwa/...autos/details/

Good luck finding one.
__________________
Dave Locke
Team PerformanceHobbies.ca | ORCA RC | Bodies by Brandon | Team Meeting
XRAY T4'15 x2 | XRAY XB4 | XRAY XB8E | XRAY XB8
locked is offline   Reply With Quote
Old 10-29-2012, 03:52 PM   #419
Tech Elite
 
andrewdoherty's Avatar
 
Join Date: Jan 2005
Location: ★Wylie, TX★
Posts: 3,763
Trader Rating: 47 (100%+)
Default

Quote:
Originally Posted by mike ivy View Post
Hello Andrew,

I think this might be it under the airtronics name.

http://www3.towerhobbies.com/cgi-bin...&I=LXJTU7&P=SM

hope this helps
Mike
Quote:
Originally Posted by locked View Post
RC mushroom sells it, but they are out of stock. I think you are probably looking for model number 94971.
http://www.rc-mushroom.com/product_i...ducts_id=21691

LRP says they have some, but I don't know how you are supposed to order from their site. The online shop seems to just be in German. I was able to find the sanwa servos section, but this one wasn't there.??
http://www.lrp.cc/en/products/sanwa/...autos/details/

Good luck finding one.
From what I can find there's a distinct difference in performance between the Airtronics and Sanwa. Same case size and shape, but I think the Airtronics 94761z is like 65 in/oz and .14 secs at 6.0 volts and the Sanwa is 53 in/oz and .07. I found lot's of European shops that carry the Sanwa and have it in stock, but after e-mailing them I couldn't find one that would ship to the USA.
__________________
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
|◤Hobbywing◢|◤SpeedzoneUSA.com◢|◤Pro-One◢|
|◤ReflexRacing.net◢|◤Protoform◢|◤AVID R/C◢|
andrewdoherty is offline   Reply With Quote
Old 10-29-2012, 04:11 PM   #420
Tech Master
 
Join Date: Jul 2011
Location: Austin, TX
Posts: 1,117
Trader Rating: 13 (100%+)
Default

Quote:
Originally Posted by andrewdoherty View Post
From what I can find there's a distinct difference in performance between the Airtronics and Sanwa. Same case size and shape, but I think the Airtronics 94761z is like 65 in/oz and .14 secs at 6.0 volts and the Sanwa is 53 in/oz and .07. I found lot's of European shops that carry the Sanwa and have it in stock, but after e-mailing them I couldn't find one that would ship to the USA.
Andrew, I was using the Airtronics 94761 in my car last weekend. On paper, the specs aren't quite as good as the JRs I was using before... but on the track, the servo was great.

I seem to recall that the Sanwa's speed is spec-ed @ 45* as opposed to 60*, or something like that. It's actual speed was something on par with the JR 3650.

That being said... if you find a source for them, let me know.
JamesL_71 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
12th Scale Racing is Alive and Well in So Cal RedBullFiXX California Racing 563 11-20-2016 08:18 AM



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 03:18 AM.


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

SEO by vBSEO 3.5.0