R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 12-17-2012, 08:27 PM   #796
Tech Initiate
 
Join Date: Nov 2009
Location: Great Falls Montana
Posts: 34
Trader Rating: 2 (100%+)
Default My XTI is Loosing the Back end!!

Help!!

My XTI is handling amazingly well with one exception, at the end of the straight we have a tight 180 corner and sometimes my car will just slide out as I enter the corner? My car is pretty much stock and were running 17.5 blinky on a very tight track. Grey low rears and chrome fronts both safety glued. I'm running 10,000 in the tubes, white side springs and white center spring and 50 front springs.
I'm using sticky finger traction compound with full treatment on the rear and about a 1/4 of the inside of the front tires. I tried a gold center spring that I thought would be softer and that didn't seem to help in fact it might have been a touch worse?

Any help would be greatly appreciated, thanks in advance..

Bob
Bobinmt is offline   Reply With Quote
Old 12-17-2012, 08:58 PM   #797
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by andrewdoherty View Post
Yep and yep. You're both correct.
Many thanks....
__________________
Wheeling an Xray T4 and T4 14 using a Ko Propo, powered by EA motors and Speed Passion Speedo, paid for by my wife.

Digi3Dworks - 3D printing for the medical Field.
bvoltz is offline   Reply With Quote
Old 12-17-2012, 09:02 PM   #798
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by Bobinmt View Post
Help!!

My XTI is handling amazingly well with one exception, at the end of the straight we have a tight 180 corner and sometimes my car will just slide out as I enter the corner? My car is pretty much stock and were running 17.5 blinky on a very tight track. Grey low rears and chrome fronts both safety glued. I'm running 10,000 in the tubes, white side springs and white center spring and 50 front springs.
I'm using sticky finger traction compound with full treatment on the rear and about a 1/4 of the inside of the front tires. I tried a gold center spring that I thought would be softer and that didn't seem to help in fact it might have been a touch worse?

Any help would be greatly appreciated, thanks in advance..

Bob
Wait for the experts, but my first suggestion would be to increase the oil in the tubes... I would also go up on the center spring. I'm running Andrew Knapp's setup and it is really good, listed below:

Crc xti inline
.55 front spring
.404 king pin length
5 degree caster
.5 degree camber
Crc black center spring
30wt oil in center shock
2mm pod.droop
3.5mm ride height. Front , center and rear.
Magenta front tire
pink rear tire
blue side springs just touching
20000 dampner tube lube
Protoform amr
__________________
Wheeling an Xray T4 and T4 14 using a Ko Propo, powered by EA motors and Speed Passion Speedo, paid for by my wife.

Digi3Dworks - 3D printing for the medical Field.
bvoltz is offline   Reply With Quote
Old 12-17-2012, 09:06 PM   #799
Tech Addict
 
3D-Seth's Avatar
 
Join Date: Jun 2011
Location: North Port, FL
Posts: 733
Trader Rating: 20 (100%+)
Default

Quote:
Originally Posted by Bobinmt View Post
Help!!

My XTI is handling amazingly well with one exception, at the end of the straight we have a tight 180 corner and sometimes my car will just slide out as I enter the corner? My car is pretty much stock and were running 17.5 blinky on a very tight track. Grey low rears and chrome fronts both safety glued. I'm running 10,000 in the tubes, white side springs and white center spring and 50 front springs.
I'm using sticky finger traction compound with full treatment on the rear and about a 1/4 of the inside of the front tires. I tried a gold center spring that I thought would be softer and that didn't seem to help in fact it might have been a touch worse?

Any help would be greatly appreciated, thanks in advance..

Bob
Bob,

I'm no expert by any means but at our local track I had a similar issue.

I'm running it pretty much box stock but I did change to 0 degree caster blocks, and I'm running Yellow Rears/Black fronts, green center spring.

Switching from Chrome fronts and Grey Low rears to Black fronts and Yellow rears seemed to keep my car from doing that. I'm using SXT traction compound here, and doing full rears and 3/4 inside on the fronts. So far it seems (to me anyway) that tires are about 85% of the overall setup of the car. Give the above set a try.
3D-Seth is offline   Reply With Quote
Old 12-19-2012, 09:27 PM   #800
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by 303slowdown View Post
Pod droop is very important. It effects how much weight gets transfered to the front of the car off power. More droop = more weight transfer. I measure ride height at front of pod then pull where shock attaches to pod till suspension locks out and re measure, that # is your droop.
Ok... Here is what I have, let me know if I have a reasonable understanding...

I can pick the center of the car 2mm before the tires come off the setup board.

I have RH front 3.5, center 3mm and 3.5 Rear.

Before I made the above adjustments I had 4mm and the car was flat... 3.5mm at all 3 points....

I'm trying to learn....
__________________
Wheeling an Xray T4 and T4 14 using a Ko Propo, powered by EA motors and Speed Passion Speedo, paid for by my wife.

Digi3Dworks - 3D printing for the medical Field.
bvoltz is offline   Reply With Quote
Old 12-19-2012, 10:00 PM   #801
Tech Champion
 
RedBullFiXX's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2003
Location: Intergalactic Planetary
Posts: 6,539
Trader Rating: 34 (100%+)
Default

Quote:
Originally Posted by bvoltz View Post
Ok... Here is what I have, let me know if I have a reasonable understanding...

I can pick the center of the car 2mm before the tires come off the setup board.

I have RH front 3.5, center 3mm and 3.5 Rear.

Before I made the above adjustments I had 4mm and the car was flat... 3.5mm at all 3 points....

I'm trying to learn....
Pod angle, and chassis sag, 2 different things that work together

Have a quick read HERE
__________________
--> 12th scale Information Source <--

"Men do not quit playing because they grow old; they grow old because they quit playing."
― Oliver Wendell Holmes Jr.
RedBullFiXX is offline   Reply With Quote
Old 12-19-2012, 10:21 PM   #802
Tech Elite
 
303slowdown's Avatar
 
Join Date: Sep 2008
Location: Rapid City SD.
Posts: 2,191
Trader Rating: 19 (100%+)
Default

Quote:
Originally Posted by bvoltz View Post
Ok... Here is what I have, let me know if I have a reasonable understanding...

I can pick the center of the car 2mm before the tires come off the setup board.

I have RH front 3.5, center 3mm and 3.5 Rear.

Before I made the above adjustments I had 4mm and the car was flat... 3.5mm at all 3 points....

I'm trying to learn....
I would raise your center to 3.5, then you will have 1.5mm of droop. Try that first then try it with the .5mm of chassis sag and see if you notice a difference. I dont run crc cars but i normaly run 1.5mm of droop in the slower classes and 1mm in mod. You will have to do some testing to see what works for you.
__________________
Ryan Borgheiinck
303slowdown is online now   Reply With Quote
Old 12-19-2012, 10:26 PM   #803
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by 303slowdown View Post
I would raise your center to 3.5, then you will have 1.5mm of droop. Try that first then try it with the .5mm of chassis sag and see if you notice a difference. I dont run crc cars but i normaly run 1.5mm of droop in the slower classes and 1mm in mod. You will have to do some testing to see what works for you.
Thanks. I will give that a try...
__________________
Wheeling an Xray T4 and T4 14 using a Ko Propo, powered by EA motors and Speed Passion Speedo, paid for by my wife.

Digi3Dworks - 3D printing for the medical Field.
bvoltz is offline   Reply With Quote
Old 12-19-2012, 10:28 PM   #804
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by RedBullFiXX View Post
Pod angle, and chassis sag, 2 different things that work together

Have a quick read HERE
I did many times... I just wanted to verify I go it... the text..... As I'm a newbie with 1/12th, I was just checking with you fine folk here if I did it correctly, so I change the verbage to show my understanding, could be + or -....
__________________
Wheeling an Xray T4 and T4 14 using a Ko Propo, powered by EA motors and Speed Passion Speedo, paid for by my wife.

Digi3Dworks - 3D printing for the medical Field.
bvoltz is offline   Reply With Quote
Old 12-19-2012, 10:32 PM   #805
Tech Champion
 
RedBullFiXX's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2003
Location: Intergalactic Planetary
Posts: 6,539
Trader Rating: 34 (100%+)
Default

Quote:
Originally Posted by bvoltz View Post
I did many times... I just wanted to verify I go it... the text..... As I'm a newbie with 1/12th, I was just checking with you fine folk here if I did it correctly, so I change the verbage to show my understanding, could be + or -....
Cool
Learning all the new stuff is the most fun, with mostly low expectations at first

After that it's just applying what you know

And later the frustration of expert drivers always wheeling cars around faster we can
__________________
--> 12th scale Information Source <--

"Men do not quit playing because they grow old; they grow old because they quit playing."
― Oliver Wendell Holmes Jr.
RedBullFiXX is offline   Reply With Quote
Old 12-19-2012, 10:37 PM   #806
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by RedBullFiXX View Post
Cool
Learning all the new stuff is the most fun, with mostly low expectations at first

After that it's just applying what you know

And later the frustration of expert drivers always wheeling cars around faster we can
May I ask...
Running a shorter shock ball end to the longer one, (yes I would have to move the pivot ball 1 hole) what will do this do for the car? if anything....
__________________
Wheeling an Xray T4 and T4 14 using a Ko Propo, powered by EA motors and Speed Passion Speedo, paid for by my wife.

Digi3Dworks - 3D printing for the medical Field.
bvoltz is offline   Reply With Quote
Old 12-19-2012, 10:44 PM   #807
Tech Champion
 
RedBullFiXX's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2003
Location: Intergalactic Planetary
Posts: 6,539
Trader Rating: 34 (100%+)
Default

Quote:
Originally Posted by bvoltz View Post
May I ask...
Running a shorter shock ball end to the longer one, (yes I would have to move the pivot ball 1 hole) what will do this do for the car? if anything....
That would be a great question for Dumper, or another CRC team driver

Having never owned or driven a CRC, I could not give accurate advice on that
__________________
--> 12th scale Information Source <--

"Men do not quit playing because they grow old; they grow old because they quit playing."
― Oliver Wendell Holmes Jr.
RedBullFiXX is offline   Reply With Quote
Old 12-19-2012, 11:34 PM   #808
Tech Champion
 
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,157
Default

Who makes that front brace that goes across the top of the caster blocks? Just got me an XTI and I want to make sure and order one Thanks
InspGadgt is offline   Reply With Quote
Old 12-19-2012, 11:37 PM   #809
Tech Elite
 
andrewdoherty's Avatar
 
Join Date: Jan 2005
Location: ★Wylie, TX★
Posts: 3,763
Trader Rating: 47 (100%+)
Default

Quote:
Originally Posted by InspGadgt View Post
Who makes that front brace that goes across the top of the caster blocks? Just got me an XTI and I want to make sure and order one Thanks
CRC
__________________
"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 12-20-2012, 01:36 AM   #810
Tech Addict
 
Robert_K's Avatar
 
Join Date: Jun 2008
Location: Netherlands, Sweet Lake City
Posts: 500
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by bvoltz View Post
May I ask...
Running a shorter shock ball end to the longer one, (yes I would have to move the pivot ball 1 hole) what will do this do for the car? if anything....
Correct me if I'm wrong, but as I understand this changes the angle of the center shock and therefor mostly the amount of rotation (midcorner) steering. I thought it was like, a more straight (horizontal) demper give a little more rotation midcorner, but takes a way a bit steering at corner entry.

Regards Robert
__________________
Sponsored by: Schumacher Racing and Dualsky
Supported by: Shepherd Benelux and Thunder Tiger.
Robert_K 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 02:58 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