Xray T4'17
#841
I am finishing up my '2017 build and I am running into problems with the steering setup.
1.) The Steering link is hitting the topdeck. As stated in the manual I shimmed it 5mm.
2.) This is my main issue right now, I cannot get an equal throw left and right. With 100% steering I always end up with the endpoints at 85L and 95R. If I increase the throw to the left the shims hit the steering rack. Since the steering is symmetric there shouldn't be that much of a difference with the EPAs in my opinion.
1.) The Steering link is hitting the topdeck. As stated in the manual I shimmed it 5mm.
2.) This is my main issue right now, I cannot get an equal throw left and right. With 100% steering I always end up with the endpoints at 85L and 95R. If I increase the throw to the left the shims hit the steering rack. Since the steering is symmetric there shouldn't be that much of a difference with the EPAs in my opinion.
I had the same issue ... solution is twofold : either a TM/Serpent "bended" ballcup, or a slightly shorter servo arm (or one of the "inner" holes in the servo saver if you use it)2- Check that your servo "neutral" is dead-vertical, that all links are 100.0% symmetric, etc... Still towards the end of the servo rotation, due to the geometrics of it all, 1% extra EPA really isn't much extra throw at the wheel, hence it doesn't take much asymetry in the links to be slightly different L/R. As long as all your linkages are ok and you're ok with the handling, I wouldn't worry about it too much
#842
2- Check that your servo "neutral" is dead-vertical, that all links are 100.0% symmetric, etc... Still towards the end of the servo rotation, due to the geometrics of it all, 1% extra EPA really isn't much extra throw at the wheel, hence it doesn't take much asymetry in the links to be slightly different L/R. As long as all your linkages are ok and you're ok with the handling, I wouldn't worry about it too much 

#843
Since I am already asking questions here is another one regarding the setup sheet. When I take a look at the wheelbase, I see 0 1 1. Does this mean zero shims, one in the front (FF) and one in the back (FR), respectively the other way around for RF and RR? I am asking this since the standard setup in the manual shows a 1mm shim at the front AND back.
Thank you very much in advance,
Mike
Thank you very much in advance,
Mike
Last edited by MGU; 02-21-2017 at 02:32 AM.
#845
#846

Mike,
The setup sheets really show which shim goes where, as you can fit 2mm total of shims on the lower hinge pins.
for the F, tick zero if all your shims are at the back of the arm (lwb), 1mm if it's 1mm on each side of the arm, and both 1mm boxes if you have your front arms all the way to the back (swb).
Same for the back, except the lwb/swb comments are reversed as the setup sheet indicates how many shims you put in front of the rear arm

Hope this helps,
Paul
#847

Mike,
The setup sheets really show which shim goes where, as you can fit 2mm total of shims on the lower hinge pins.
for the F, tick zero if all your shims are at the back of the arm (lwb), 1mm if it's 1mm on each side of the arm, and both 1mm boxes if you have your front arms all the way to the back (swb).
Same for the back, except the lwb/swb comments are reversed as the setup sheet indicates how many shims you put in front of the rear arm

Hope this helps,
Paul
#848
Tech Master
iTrader: (4)
Joined: Jan 2003
Posts: 1,955
Noob time. What pitch is XRAY? What gearing does everyone recommend to start on a 13.5T, 17.5T, and 21.5T? I'm trying to figure out if I have the right gears.
Is the Spur and Motor easy to remove? I'd like to try and get two classes out of the car. I'm done having a car for each class.
Is the Spur and Motor easy to remove? I'd like to try and get two classes out of the car. I'm done having a car for each class.
#849
Tech Master
iTrader: (3)
Joined: Feb 2009
Posts: 1,368
From: Saskatoon, SK, Canada
Since I am already asking questions here is another one regarding the setup sheet. When I take a look at the wheelbase, I see 0 1 1. Does this mean zero shims, one in the front (FF) and one in the back (FR), respectively the other way around for RF and RR? I am asking this since the standard setup in the manual shows a 1mm shim at the front AND back.
Thank you very much in advance,
Mike
Thank you very much in advance,
Mike
Noob time. What pitch is XRAY? What gearing does everyone recommend to start on a 13.5T, 17.5T, and 21.5T? I'm trying to figure out if I have the right gears.
Is the Spur and Motor easy to remove? I'd like to try and get two classes out of the car. I'm done having a car for each class.
Is the Spur and Motor easy to remove? I'd like to try and get two classes out of the car. I'm done having a car for each class.
Gear ratio for spec motors really depends on your track. For 17.5, 4.2FDR is always a safe start, and for 21.5, I believe most guys are running a 3.8 or 3.9FDR. Someone correct me if I'm too low.
#850
#853
Tech Master
Joined: Jan 2005
Posts: 1,457
Thanks! Your suggestions were spot -on. After using them my friend and I were able to tune the car to be way more drivable!
Now I could use some help getting the car to rotate from the apex to the exit of the corner
Thanks again!
Now I could use some help getting the car to rotate from the apex to the exit of the corner

Thanks again!
To make a car safer and easier to drive, go thicker on the oils, raise the inner links and reduce the droop.
So try 500 shocks, 5 or 7k diff, 2mm links. 5mm ride height and 6/5 droop.
And from what I read on here, glue the hell out of the front tyres for the black American carpet.
So try 500 shocks, 5 or 7k diff, 2mm links. 5mm ride height and 6/5 droop.
And from what I read on here, glue the hell out of the front tyres for the black American carpet.
#854
#855
Tech Master
iTrader: (7)
Joined: Aug 2013
Posts: 1,026
From: Peachland, BC, Canada
Luke





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