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Old 09-06-2015, 12:35 PM   #1546
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Just tried out the ARS for the first time. At first the rear end seemed to be inconsistent. Sometimes it would loose traction, especially when going through chicanes. Added more rear camber and stood the rear shocks up a bit....really helped it out. The car rotated really well, and I could drive it much harder through the turns. So overall, I think it went pretty well. I used a static rear toe in of 2.5, and 3.0 rear toe in under full suspension compression.

this sounds good is the track a flowing track and do you have a setup sheet showing the overall set up

Thanks
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Old 09-06-2015, 12:44 PM   #1547
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looking for a t4 15, anyone got one for sale?
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Old 09-06-2015, 02:36 PM   #1548
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Originally Posted by SpidarX View Post
Just tried out the ARS for the first time. At first the rear end seemed to be inconsistent. Sometimes it would loose traction, especially when going through chicanes. Added more rear camber and stood the rear shocks up a bit....really helped it out. The car rotated really well, and I could drive it much harder through the turns. So overall, I think it went pretty well. I used a static rear toe in of 2.5, and 3.0 rear toe in under full suspension compression.
Also allow for the fact that the ARS system narrows the rear, I think by 1mm.
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Old 09-06-2015, 09:52 PM   #1549
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looking for a t4 15, anyone got one for sale?
There is one for sale on ebay....looks like a nice kit.
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Old 09-08-2015, 06:50 PM   #1550
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Considering smaller spur and pinion gears and wondering if there are any suggestions from Xray T4 2015 owners that would help. Looking to reduce rotating mass with a different gear combination. Currently running a 52/96 (64p) combination. We run on a small parking lot track with our long straight about 63 feet long. ()

I also need to confirm the internal multiplier in the diff to calculate the FDR. Bought the car used with only 1 race event under it's belt and I'm still on a steep learning curve.

What brands of spur gears fit?....or maybe the short answer to the question is: which brands won't fit the Xray?

Thanks in advance!!
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Old 09-08-2015, 11:18 PM   #1551
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I use Panaracer and/or LeeSpeed most of the time depending which brand has the specific tooth I need.

Prior to that, I have used Spec-R and some HPI spurs.

Also have used speedmind with a modification to my spur gear pulley (sanding off .5mm from the big black spacer).

I also have tested some Tamiya spur gears too.
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Old 09-09-2015, 03:05 AM   #1552
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If going to a smaller spur / pinion, I think you'll notice the weight balance change more than any rotating mass change.
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Old 09-09-2015, 05:25 AM   #1553
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If going to a smaller spur / pinion, I think you'll notice the weight balance change more than any rotating mass change.
Just what I was thinking. You need to lose a lot of rotating mass to regain half a second from the rear end stepping out!
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Old 09-09-2015, 10:11 AM   #1554
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Considering smaller spur and pinion gears and wondering if there are any suggestions from Xray T4 2015 owners that would help. Looking to reduce rotating mass with a different gear combination. Currently running a 52/96 (64p) combination. We run on a small parking lot track with our long straight about 63 feet long. ()

I also need to confirm the internal multiplier in the diff to calculate the FDR. Bought the car used with only 1 race event under it's belt and I'm still on a steep learning curve.

What brands of spur gears fit?....or maybe the short answer to the question is: which brands won't fit the Xray?

Thanks in advance!!
52/96, what motor are you running. i agree with everyone else about rotating mass.. the driveline is very light.. heck.. the car is extremely light.. i run a 17.5TC class and have to add weight, in order to meet the weight requirements for the class. i use a 96t with 46-48 normally on a descent sized asphalt track.

only 63' straight.. is your FDR correct? i think the Transmission ratio number your looking for is 1.9
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Old 09-11-2015, 12:17 PM   #1555
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Dumb question for you gurus out there.. since switching from offroad to onroad, i am having trouble understanding how you guys figure gear ratio or drive ratio. i know how to do the math, what i want to know, is how do you guys know what FDR will put you in the ball park for differnt turn motors.

i typically run 17.5, so, i know where i should be for that.. but.. if i decided to run mod, 8.5 for example, where would i start? where would i start for say a 5.5? what is the rule of thumb.

in offroad, you usually dont change motors much.. and gearing is about the same.. plus or minus a tooth..

thanks for the incite.
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Old 09-11-2015, 09:41 PM   #1556
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Originally Posted by dgrobe2112 View Post
Dumb question for you gurus out there.. since switching from offroad to onroad, i am having trouble understanding how you guys figure gear ratio or drive ratio. i know how to do the math, what i want to know, is how do you guys know what FDR will put you in the ball park for differnt turn motors.

i typically run 17.5, so, i know where i should be for that.. but.. if i decided to run mod, 8.5 for example, where would i start? where would i start for say a 5.5? what is the rule of thumb.

in offroad, you usually dont change motors much.. and gearing is about the same.. plus or minus a tooth..

thanks for the incite.
A lot of times, the motor manufacturer will give you a starting range.
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Old 09-11-2015, 10:36 PM   #1557
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Originally Posted by dgrobe2112 View Post
52/96, what motor are you running. i agree with everyone else about rotating mass.. the driveline is very light.. heck.. the car is extremely light.. i run a 17.5TC class and have to add weight, in order to meet the weight requirements for the class. i use a 96t with 46-48 normally on a descent sized asphalt track.

only 63' straight.. is your FDR correct? i think the Transmission ratio number your looking for is 1.9

A local Xray t4 2015 driver told me the diff multiplier is 2.1, so I would definitely like a confirmed multiplier before I go nut changing gearing. Currently running a 17.5 Schuur Speed short stack motor but will be changing to a Certified Trinity D4 when we start our day racing schedule in early October.

I just confirmed that you are correct....and my local friend is NOT!!
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Last edited by OttoKrosse; 09-11-2015 at 11:11 PM. Reason: Added last sentence.
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Old 09-11-2015, 10:55 PM   #1558
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20 tooth layshaft pulleys and 38 tooth diffs equals 1.9:1
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Old 09-11-2015, 11:13 PM   #1559
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20 tooth layshaft pulleys and 38 tooth diffs equals 1.9:1
Thanks, I just went to the Hudy site and found it!
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Old 09-13-2015, 08:46 PM   #1560
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Are there any other brands of spur gear that fit this car? Kimbrough & Robinson appear to be too thick.
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