R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 05-02-2012, 05:44 AM   #4066
Tech Regular
 
mrjeremyaaron's Avatar
 
Join Date: Jul 2010
Location: Gold Coast, QLD
Posts: 355
Trader Rating: 9 (100%+)
Default

Can anyone help me out - I'm having no luck getting any sort of direct steering and grip in the front end. Entry, mid and exit. Rear seems fairly locked in.

Have basically been running the kit setup since new and always had this problem. At first it was good cause easy to drive, but I'm getting people turn under me on every corner.

Setup is all screws on the top deck, 5 and 5.5mm rear ride height, 1.5mm camber all round, 0.5 and 3mm shims on the outside camber arms (had to drop as was getting rub action on the inside of wheel rims..), hav increased droop to 5 and 4mm in rear.

Anyone hav a suggestion on where to start???
mrjeremyaaron is offline   Reply With Quote
Old 05-02-2012, 07:30 AM   #4067
Tech Elite
 
M-Technic's Avatar
 
Join Date: Sep 2007
Location: Palm Beach, FL
Posts: 2,562
Trader Rating: 15 (100%+)
Default

You need to go back to 4 or 5mm shims on the outside of the rear camber link, which will really help free up the back end. Use a pipe reamer to clearance the inside of your rims so it won't rub on the link. Also, use the lower inner camber link mounting position.

I'd also try 3mm droop (over ride height) all the way around, and do you have any ackerman or bump steer shims?
__________________
RCAmerica | Xray | Hudy | Radiopost | Speed Passion USA | Trinity | P3 Graphics
M-Technic is offline   Reply With Quote
Old 05-02-2012, 07:40 AM   #4068
Tech Champion
 
MikeXray's Avatar
 
Join Date: Oct 2006
Location: New York
Posts: 5,749
Trader Rating: 73 (100%+)
Default

Quote:
Originally Posted by mrjeremyaaron View Post
Can anyone help me out - I'm having no luck getting any sort of direct steering and grip in the front end. Entry, mid and exit. Rear seems fairly locked in.

Have basically been running the kit setup since new and always had this problem. At first it was good cause easy to drive, but I'm getting people turn under me on every corner.

Setup is all screws on the top deck, 5 and 5.5mm rear ride height, 1.5mm camber all round, 0.5 and 3mm shims on the outside camber arms (had to drop as was getting rub action on the inside of wheel rims..), hav increased droop to 5 and 4mm in rear.

Anyone hav a suggestion on where to start???
What tires are you running and what surface? There are so many setups on the xray site it's helpful to download a bunch and look for similarities. It could be as simple as running one step softer springs all around, or running less rear toe.
__________________
Mike L. Awesomatixusa.com | TQWire.com | Islandraceway.com |JacksonRCracing.com | Horsham RC | Sweepracingusa.com
MikeXray is offline   Reply With Quote
Old 05-02-2012, 03:32 PM   #4069
Tech Regular
 
mrjeremyaaron's Avatar
 
Join Date: Jul 2010
Location: Gold Coast, QLD
Posts: 355
Trader Rating: 9 (100%+)
Default

I have added an extra 1mm under the steering knuckles (outside of steering link arms) for a total of 3mm I think.

Running on rubber / asphalt, small to medium track size, medium grip. Front is 2 degrees toe out. Using Ride 28's, have tried 32's, muchmore 32's etc, most others having good success with all of these tyres.

Essentially, it feels like I'm pushing lubed up front wheels around the track.

I'll try raising the outside rear camber links and maybe lowering the inside. Should I do this for front and rear of the car? Also, what effect does reducing rear toe have?

Someone else also suggested softer springs so might get some to try and see if that helps.
mrjeremyaaron is offline   Reply With Quote
Old 05-02-2012, 07:18 PM   #4070
Tech Fanatic
 
elee32's Avatar
 
Join Date: Mar 2011
Location: lambertville, nj
Posts: 788
Trader Rating: 18 (100%+)
Default

Quote:
Originally Posted by mrjeremyaaron View Post
I have added an extra 1mm under the steering knuckles (outside of steering link arms) for a total of 3mm I think.

Running on rubber / asphalt, small to medium track size, medium grip. Front is 2 degrees toe out. Using Ride 28's, have tried 32's, muchmore 32's etc, most others having good success with all of these tyres.

Essentially, it feels like I'm pushing lubed up front wheels around the track.

I'll try raising the outside rear camber links and maybe lowering the inside. Should I do this for front and rear of the car? Also, what effect does reducing rear toe have?

Someone else also suggested softer springs so might get some to try and see if that helps.
Try less front toe out, .5 or 1 degree. Flipping the l1 and l2 to the lower inner hole should help too
elee32 is offline   Reply With Quote
Old 05-02-2012, 08:12 PM   #4071
Tech Regular
 
rdlkgliders's Avatar
 
Join Date: Feb 2006
Location: So. Cal High Desert Hobbies
Posts: 458
Trader Rating: 21 (96%+)
Default

Hi Guys.
I posted this reply in the t3 12 thread also as I am not sure where it fits, once I am more clear on the propper thread I will only post in that thread (sorry)
I purhased a t311 with the vbc flex chassis kit which includes the E/W servo mount and I also have the more traditonal rollcenter mounts like the tamiya or serpent.
Anyway I need a begining setup for the car. It will be raced by my 8 year old son, we race outdoor asphalt low traction and very tight.
Thanks
Don
__________________
Serpent, KO Propo, Viper, Savox, ProTek
Team Waldorf Racing

Your not lapping me, you just caught up to me again!!!
rdlkgliders is offline   Reply With Quote
Old 05-03-2012, 07:04 AM   #4072
Tech Champion
 
MikeXray's Avatar
 
Join Date: Oct 2006
Location: New York
Posts: 5,749
Trader Rating: 73 (100%+)
Default

Quote:
Originally Posted by mrjeremyaaron View Post
I have added an extra 1mm under the steering knuckles (outside of steering link arms) for a total of 3mm I think.

Running on rubber / asphalt, small to medium track size, medium grip. Front is 2 degrees toe out. Using Ride 28's, have tried 32's, muchmore 32's etc, most others having good success with all of these tyres.

Essentially, it feels like I'm pushing lubed up front wheels around the track.

I'll try raising the outside rear camber links and maybe lowering the inside. Should I do this for front and rear of the car? Also, what effect does reducing rear toe have?

Someone else also suggested softer springs so might get some to try and see if that helps.
If the setup feels that bad, I would usually go with a complete setup change. If the front isn't biting at all, I'm going to guess it isn't rolling enough. What is your droop set too? You may have to just try setups in 2 different directions until you figure out what works.
__________________
Mike L. Awesomatixusa.com | TQWire.com | Islandraceway.com |JacksonRCracing.com | Horsham RC | Sweepracingusa.com
MikeXray is offline   Reply With Quote
Old 05-07-2012, 03:23 AM   #4073
Tech Adept
 
Join Date: Mar 2010
Posts: 180
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by mrjeremyaaron View Post
I have added an extra 1mm under the steering knuckles (outside of steering link arms) for a total of 3mm I think.

Running on rubber / asphalt, small to medium track size, medium grip. Front is 2 degrees toe out. Using Ride 28's, have tried 32's, muchmore 32's etc, most others having good success with all of these tyres.

Essentially, it feels like I'm pushing lubed up front wheels around the track.

I'll try raising the outside rear camber links and maybe lowering the inside. Should I do this for front and rear of the car? Also, what effect does reducing rear toe have?

Someone else also suggested softer springs so might get some to try and see if that helps.
assume you are running spool front? for me spool tends to understeer. i am also running on asphalt, low-medium grip and medium track outdoors. without buying anything you can:
1. run kit setup 350 cst with 3 holes front and rear unless you are running that already. you can try 4 holes to get more roll but too soft shocks leads to overheating tires then there is no grip
2. run short camber link in the front to increase the camber rise. static camber should be 1.5 deg all round. or adjust as you please.
3. run the -0.75 suspension arm holders to give more roll (front and rear), not a favorite but you will get more roll.
4. run the diffs in lower position
5. remove some of the screws from the top deck, you can try removing 2 from the rear first (the motor bulk heads) and then 2 from the front and see how it goes. more flex should give some grip
6. with some elbow grease you can cut the rear bit of the top deck and joins together near the motor end, there was a posting of this somewhere in this forum. worked for me.
7. reduce the wheelbase of the car on the rear, should get some better turn in. you can push in the rear anti roll bar so that it sticks out by 2 mm and push in the front anti roll bar as much as possible. some say it is better to reduce the wheelbase from the front rather than rear.
8. you can reduce the track width in the front a little but you need to experiment and find that balance. you may get something but you lose others.

if you plan to remove that spool, try a gear diff in the front, 150 k diff oil and adjust as you see fit. if you plan to buy then you can get the rear diff as well, get some springs, anti roll bars.

you can try soft inserts (even low profiles) to give you with more air gap.
rshair is offline   Reply With Quote
Old 05-07-2012, 05:30 AM   #4074
Tech Fanatic
 
MrRolla's Avatar
 
Join Date: Mar 2004
Location: Sans Souci, Sydney, Australia
Posts: 961
Trader Rating: 29 (100%+)
Default

Is it better to adjust front track widith via shims or -0.75 wheel hexes? Looking to try this change next meet. Will the hexes cause the rims to rub on the camber link?

Also had a look at the standard rubber setup sheet on the Xray site and noticed it says to use 2mm shim under the steering knuckle to counteract bump steer. im not running these (got the car like that) but if i add these what change can i expect from the car?

Cheers
MrRolla is offline   Reply With Quote
Old 05-07-2012, 07:57 PM   #4075
Tech Fanatic
 
MrRolla's Avatar
 
Join Date: Mar 2004
Location: Sans Souci, Sydney, Australia
Posts: 961
Trader Rating: 29 (100%+)
Default

Quote:
Originally Posted by MrRolla View Post
Is it better to adjust front track widith via shims or -0.75 wheel hexes? Looking to try this change next meet. Will the hexes cause the rims to rub on the camber link?

Also had a look at the standard rubber setup sheet on the Xray site and noticed it says to use 2mm shim under the steering knuckle to counteract bump steer. im not running these (got the car like that) but if i add these what change can i expect from the car?

Cheers
Can anyone help please??
MrRolla is offline   Reply With Quote
Old 05-07-2012, 08:11 PM   #4076
Tech Master
 
Join Date: Jul 2003
Location: FL
Posts: 1,604
Trader Rating: 9 (100%+)
Default

Using the hexes will be easier to change, plus you have to be careful when reducing with the shims to not pinch the blades on the diff under suspension compression if you reduce it to much. Using the shims will also change the roll characteristics since your moving the hingepin location.

If the tires rub, get a pipe reamer from the hardware store in plumbing department and remove the plastic inside the rim.

The 2mm shim on the knuckle/steering link reduces the bumpsteer to almost none. If you use less than 2mm your outside tire that is receiving the weight transfer will toe out under compression and reduce your steering arc. If you use more it will bump in and get more aggressive under load.



Hope that helps.
__________________
Mike Dobbs
barnacle is offline   Reply With Quote
Old 05-07-2012, 08:11 PM   #4077
Tech Master
 
Jerz616's Avatar
 
Join Date: Oct 2011
Location: Dallas,TX
Posts: 1,045
Trader Rating: 49 (100%+)
Default

Quote:
Originally Posted by MrRolla View Post
Can anyone help please??
Get the new hexes. If you put a shim on the outside between the hex and the wheel you won't have as much hex inside the wheel which can make it a tad weaker. With the new hex the outside of the hex will be flush with the wheel again.
__________________
Ryan Gracey

XRAY T4'14/ORCA VXX/ORCA TX 5.0
XRAY XB8'14
Jerz616 is offline   Reply With Quote
Old 05-07-2012, 08:14 PM   #4078
Tech Fanatic
 
MrRolla's Avatar
 
Join Date: Mar 2004
Location: Sans Souci, Sydney, Australia
Posts: 961
Trader Rating: 29 (100%+)
Default

Thanks guys!!!
MrRolla is offline   Reply With Quote
Old 05-08-2012, 05:42 AM   #4079
Tech Regular
 
mrjeremyaaron's Avatar
 
Join Date: Jul 2010
Location: Gold Coast, QLD
Posts: 355
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by mrjeremyaaron View Post
I have added an extra 1mm under the steering knuckles (outside of steering link arms) for a total of 3mm I think.

Running on rubber / asphalt, small to medium track size, medium grip. Front is 2 degrees toe out. Using Ride 28's, have tried 32's, muchmore 32's etc, most others having good success with all of these tyres.

Essentially, it feels like I'm pushing lubed up front wheels around the track.

I'll try raising the outside rear camber links and maybe lowering the inside. Should I do this for front and rear of the car? Also, what effect does reducing rear toe have?

Someone else also suggested softer springs so might get some to try and see if that helps.
Thanks all for your comments.

I solvd the problem by making the move from 21.5 blinky to 17.5 boosted class and returning the setup to kit. The new software had 10% drag brake as std, which suddenly gave the front the perfect amount of grip. Problem solved.

Looks like my power starved trigger finger was the issue all along.
mrjeremyaaron is offline   Reply With Quote
Old 05-08-2012, 09:30 PM   #4080
Tech Regular
 
Join Date: Feb 2009
Location: houston tx
Posts: 496
Trader Rating: 43 (100%+)
Default

what size ball joint pliers do i need for the xray t3 2011. i want the best one available so the tips of the pliers do not bend.
aceinthesky 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 10:13 PM.


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