Xray T4 '13

Old 02-26-2013, 06:44 PM
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Originally Posted by rosko View Post
Be nice if the chassis was a little narrower, motor mount like tc6.1 and spur gear and pulley mount like yokomo
How narrow do you want it?
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Old 02-26-2013, 08:45 PM
  #2852  
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About 84 mm would be nice
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Old 02-27-2013, 02:17 AM
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Handling issue, During racing this week i was experiencing issues and was wondering if anyone could provide suggesitons. Its a small indoor track, on the tight hairpins at the end of the main straight and longer straights i was struggling with the car pushing and having to brake to get the car round so i was loosing lots of corenering speed. But then in the sweeping corners it would also push if to fast but then if i let off power the car would come round on me. info XRAY T4 350 oil front and 450 back, 2.7 F 2.5 R springs, 1.5 camber all round, 1 deg toe out on front. Highish roll centre set up i.e medium length links front and short rear with 1 hole hubs. 2mm inner and 1mm outer spacer on links at front. 1mm spacer on inner and 4mm outer at rear. 2000 cst oil in rear diff. 6 downstop front and 4.5 downstop rear

Hope this is enough information

Thanks
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Old 02-27-2013, 08:50 AM
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Originally Posted by Nathan Wilson View Post
Handling issue, During racing this week i was experiencing issues and was wondering if anyone could provide suggesitons. Its a small indoor track, on the tight hairpins at the end of the main straight and longer straights i was struggling with the car pushing and having to brake to get the car round so i was loosing lots of corenering speed. But then in the sweeping corners it would also push if to fast but then if i let off power the car would come round on me. info XRAY T4 350 oil front and 450 back, 2.7 F 2.5 R springs, 1.5 camber all round, 1 deg toe out on front. Highish roll centre set up i.e medium length links front and short rear with 1 hole hubs. 2mm inner and 1mm outer spacer on links at front. 1mm spacer on inner and 4mm outer at rear. 2000 cst oil in rear diff. 6 downstop front and 4.5 downstop rear

Hope this is enough information

Thanks
The 450cst oil in the rear is the thing that jumps out at me in the setup. Is there a reason you are so thick in the rear compared to the front?
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Old 02-27-2013, 08:57 AM
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Originally Posted by Jonesy112 View Post
The 450cst oil in the rear is the thing that jumps out at me in the setup. Is there a reason you are so thick in the rear compared to the front?
i usually run 450 all round, and went to the 350 to gain more off power and mid corner steering

thanks
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Old 02-27-2013, 09:01 AM
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Originally Posted by Nathan Wilson View Post
i usually run 450 all round, and went to the 350 to gain more off power and mid corner steering

thanks
Have you tried running 350 all around. The heavier oil in the rear could be part of the push problem you are experiencing on entry (Are you running the same hole # and size pistons front and rear?)
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Old 02-27-2013, 09:01 AM
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With that heavier rear oil though its going to transfer weight to the front off power very slowly. I would try 400 ft and 350 rear. That usually works for me at most tracks.

EA
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Old 02-27-2013, 09:09 AM
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Originally Posted by Jonesy112 View Post
Have you tried running 350 all around. The heavier oil in the rear could be part of the push problem you are experiencing on entry (Are you running the same hole # and size pistons front and rear?)
no i havent yet, maybe worth a try. yea same size and hole, i lack steering on indoor tracks as the car seems to want to push on past the apex and i have to really slow down to get the car to turn

thanks
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Old 02-27-2013, 09:11 AM
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Originally Posted by EAMotorsports View Post
With that heavier rear oil though its going to transfer weight to the front off power very slowly. I would try 400 ft and 350 rear. That usually works for me at most tracks.

EA
transfeering the weight to the front will give me more steering though wont it? which is what i am after in the slower turns
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Old 02-27-2013, 09:27 AM
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Originally Posted by Nathan Wilson View Post
transfeering the weight to the front will give me more steering though wont it? which is what i am after in the slower turns
yes is will. And a heavier rear oil will transfer weight from the rear tires to the front tires slower, meaning you will have to wait longer before you get the weight on the front tires so you have more entry steering.

As EA suggested, try 400 ft and 350 rear, i bet this will help your car greatly.
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Old 02-27-2013, 09:32 AM
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Originally Posted by Nathan Wilson View Post
transfeering the weight to the front will give me more steering though wont it? which is what i am after in the slower turns
Originally Posted by Jonesy112 View Post
yes is will. And a heavier rear oil will transfer weight from the rear tires to the front tires slower, meaning you will have to wait longer before you get the weight on the front tires so you have more entry steering.

As EA suggested, try 400 ft and 350 rear, i bet this will help your car greatly.
Exactly!

I think that heavy rear oil is causing your issues.

EA
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Old 02-27-2013, 09:33 AM
  #2862  
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Originally Posted by rosko View Post
About 84 mm would be nice
Why?
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Old 02-27-2013, 01:46 PM
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Originally Posted by Nathan Wilson View Post
no i havent yet, maybe worth a try. yea same size and hole, i lack steering on indoor tracks as the car seems to want to push on past the apex and i have to really slow down to get the car to turn

thanks
Could the chassis be rubbing on the ground when cornering?
Check ride height?
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Old 02-27-2013, 03:15 PM
  #2864  
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Originally Posted by Nathan Wilson View Post
Handling issue, During racing this week i was experiencing issues and was wondering if anyone could provide suggesitons. Its a small indoor track, on the tight hairpins at the end of the main straight and longer straights i was struggling with the car pushing and having to brake to get the car round so i was loosing lots of corenering speed. But then in the sweeping corners it would also push if to fast but then if i let off power the car would come round on me. info XRAY T4 350 oil front and 450 back, 2.7 F 2.5 R springs, 1.5 camber all round, 1 deg toe out on front. Highish roll centre set up i.e medium length links front and short rear with 1 hole hubs. 2mm inner and 1mm outer spacer on links at front. 1mm spacer on inner and 4mm outer at rear. 2000 cst oil in rear diff. 6 downstop front and 4.5 downstop rear

Hope this is enough information

Thanks
On our tighter track with 180deg corners etc. we use 2.7 rear springs.
I have also found a 1.3mm rear roll bar quite useful.
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Old 02-27-2013, 03:16 PM
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More weight= more traction right?? So more weight on front= more cornering(oversteer) due to relatively lower grip on rear?
So to reduce understeer(push) at the entry of corner, faster weight transfer to front is vital. To achieve that, larger piston holes/more piston holes/thinner oil/soft shock springs, right? Please correct me if I'm wrong.
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