Xray T4 '13

Old 04-27-2013, 01:50 PM
  #3316  
Tech Master
iTrader: (41)
 
edhchoe's Avatar
 
Join Date: Jul 2004
Location: vancouver, wa, usa
Posts: 1,509
Trader Rating: 41 (100%+)
Default Tight belt= bad

Ran the car for the first time on asphalt track.
Half way thru the battery pack the car put on a hard brake and stopped.
It turned out to be a twisted rear belt.

I had followed the manual but it was about three clicks too tight according to the track veterans.

edhchoe is offline  
Old 04-27-2013, 08:54 PM
  #3317  
Tech Master
iTrader: (41)
 
edhchoe's Avatar
 
Join Date: Jul 2004
Location: vancouver, wa, usa
Posts: 1,509
Trader Rating: 41 (100%+)
Default

Asphalt, 60F, VTA setup with 21.5T.
Stock Xray asphalt setup.

The car felt like a FWD. The rear was loose coming out of tight turns and I had to get on the throttle with counter steer to keep it from spinning out.

I tried laying the rear shocks down one hole toward the middle - didn't help.
I tried decreasing the rear droop by 1/4 turn - didn't help.

What should I try next?

Thanks.
edhchoe is offline  
Old 04-27-2013, 09:11 PM
  #3318  
Dan
Tech Champion
iTrader: (67)
 
Dan's Avatar
 
Join Date: Oct 2001
Posts: 5,524
Trader Rating: 67 (100%+)
Default

Not sure what you mean by car handling like FWD. First step is try softer rear springs to tame down the rear. I didn't really like the rear progressive springs. I have tried 2.3 and 2.5 rear springs but I like 2.5 rear the best. The 2.3 caused my car to push too much.

Of course I'm not running VTA though...but those were just some of the things I did to keep the rear end in check. Another thing you can do is take out some screws off from the upper deck to allow more flex.
Dan is offline  
Old 04-27-2013, 09:42 PM
  #3319  
Tech Master
iTrader: (10)
 
Car Breaker's Avatar
 
Join Date: Apr 2004
Location: Grave Yard
Posts: 1,295
Trader Rating: 10 (100%+)
Default

stock rear spring is good for high grip track, if your local track is not that grippy, use a 2.5 on the rear.
Car Breaker is offline  
Old 04-27-2013, 09:43 PM
  #3320  
Tech Master
iTrader: (41)
 
edhchoe's Avatar
 
Join Date: Jul 2004
Location: vancouver, wa, usa
Posts: 1,509
Trader Rating: 41 (100%+)
Default

It is counterintuitive. But I will give it a try. Thanks.
edhchoe is offline  
Old 04-27-2013, 09:46 PM
  #3321  
Tech Master
iTrader: (10)
 
Car Breaker's Avatar
 
Join Date: Apr 2004
Location: Grave Yard
Posts: 1,295
Trader Rating: 10 (100%+)
Default

that is my local track, may not be same as yours.
Car Breaker is offline  
Old 04-27-2013, 10:08 PM
  #3322  
Tech Master
iTrader: (13)
 
Join Date: Nov 2012
Posts: 1,140
Trader Rating: 13 (100%+)
Default

Originally Posted by Car Breaker View Post
stock rear spring is good for high grip track, if your local track is not that grippy, use a 2.5 on the rear.
2.7 in front and 2.5 rear xray 450 oil all around is what I had when I had my best run and fastest lap (3/10ths slower than the fastest lap of the day) on carpet.. Today I ran the stock progressive 2.3-2.6 in the rear and 2.5-2.8 progressive up front with xray 400 oil all around and it was perfect all day, at the start of the day it was like ice with little grip if any and I was amazed how the car wasn't all over unless I drove it too hard out of the corner
JOE SI is offline  
Old 04-28-2013, 03:09 AM
  #3323  
Tech Master
iTrader: (17)
 
Join Date: Jul 2008
Location: Hobart TAS Australia
Posts: 1,068
Trader Rating: 17 (100%+)
Red face

Originally Posted by edhchoe View Post
Asphalt, 60F, VTA setup with 21.5T.
Stock Xray asphalt setup.

The car felt like a FWD. The rear was loose coming out of tight turns and I had to get on the throttle with counter steer to keep it from spinning out.

I tried laying the rear shocks down one hole toward the middle - didn't help.
I tried decreasing the rear droop by 1/4 turn - didn't help.

What should I try next?

Thanks.
I had the same problem, fixed it by running rear diff low
Also use 2.7 front 2.5 rear
lethallee69 is offline  
Old 04-28-2013, 09:55 AM
  #3324  
Tech Addict
iTrader: (2)
 
Kellen Guthrie's Avatar
 
Join Date: Oct 2012
Location: Huntington Beach, CA
Posts: 599
Trader Rating: 2 (100%+)
Default

What kinds of spares should I carry for this car? Belts, arms, steering knuckle, and c hubs?
Kellen Guthrie is offline  
Old 04-28-2013, 09:55 AM
  #3325  
Tech Elite
iTrader: (33)
 
Riketsu's Avatar
 
Join Date: Aug 2004
Location: Puerto Rico
Posts: 2,586
Trader Rating: 33 (100%+)
Default

I don't know if this has been mentioned before,

but the CSO Alu Lightweight Shock Spring Holder do not fit the shock ball joints and the CSO Racing Alu Steeering Arm Xray T4 & T3 2pcs have too much play in the bearings (Get the A Plus or the Original if you want them).

Just a heads up, I have already emailed CSO directly, let's see how they handle this.
Riketsu is offline  
Old 04-28-2013, 02:32 PM
  #3326  
Tech Elite
iTrader: (9)
 
B00t13g's Avatar
 
Join Date: Mar 2012
Location: Houston, TX
Posts: 2,041
Trader Rating: 9 (100%+)
Default

What pinions are everyone using?
B00t13g is offline  
Old 04-28-2013, 03:16 PM
  #3327  
Tech Master
iTrader: (13)
 
Join Date: Nov 2012
Posts: 1,140
Trader Rating: 13 (100%+)
Default

Originally Posted by B00t13g View Post
What pinions are everyone using?
Are they hitting your battery or top deck or motor screws?
For the first time since I bought it I'm having this problem but only since I switched to a revtech from a thunder power..
The revtechs rotor is longer than the tp and the flat spot is shorter so the pinions hit the battery or if put on backwards the motor screws or top deck, the only pinions I didn't have the problem with was the CRC ones put on backwards
JOE SI is offline  
Old 04-28-2013, 03:50 PM
  #3328  
Tech Apprentice
 
Join Date: Dec 2003
Location: UK
Posts: 64
Default Pinions

I have this problem with a TP 17.5 in a T4 in the UK.

On a T3/12 I ran pinions in the 37-40 range with a 72 spur - 48DP.
To get this gearing on a T4 I had to fit a 66 spur then a 37 pinion so that the pinion was small enough to clear the motor screws. The pinion was fitted back to front and still only just clears the belt by a tiny amount.
The real problem here is that as far as I know no one makes narrow pinions in the larger sizes.
donwhit is offline  
Old 04-28-2013, 05:09 PM
  #3329  
Tech Master
iTrader: (41)
 
edhchoe's Avatar
 
Join Date: Jul 2004
Location: vancouver, wa, usa
Posts: 1,509
Trader Rating: 41 (100%+)
Default

Racing on Asphalt 48P would be recommended but I am having trouble finding the right gears for my car.

With 21.5T on pretty open course what FDR should I start from? 4.0? 3.5?
I will need a smaller Spur as well.
Where do you buy smaller spur than 78T 48p or 96T 64p?

Thanks.
edhchoe is offline  
Old 04-29-2013, 02:45 AM
  #3330  
Tech Elite
 
Skiddins's Avatar
 
Join Date: Feb 2006
Location: Windsor, UK
Posts: 4,911
Default

Originally Posted by edhchoe View Post
Racing on Asphalt 48P would be recommended but I am having trouble finding the right gears for my car.

With 21.5T on pretty open course what FDR should I start from? 4.0? 3.5?
I will need a smaller Spur as well.
Where do you buy smaller spur than 78T 48p or 96T 64p?

Thanks.
RW Racing are almost a standard for aftermarket spurs and pinions in the UK.

Not sure where you can get them in the US, but you want to look for their Xray specific spurs.

Skiddins
Skiddins is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.