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R/C Tech Forums Thread Wiki: Xray T4 2016
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Last edit by: R Dodge
Welcome to the XRAY T4'16 Thread & Wikipost! Here you will find some useful info, tips and tricks as well as setups that are used by several team drivers. This wikipost is a work in progress and should continue to develop over time.

Tips & Tricks:

Alex Hagberg's Tech Tip Tuesday articles

How to mount your Protoform LTC-R Body
Setting static camber
How to mount weight on your chassis Part1
How to mount the rear wing on Protoform bodies
Simple troubleshooting guide
How to mount the battery on your chassis
How to glue your front tires for CRC Black carpet with Eric Anderson
Utilizing Exponential and RMode on the M12S
How to mount weight on your chassis Part2

Team driver Tim Wahl posted some very useful tips on Facebook as he worked through building a new kit.

1- Carbon Parts
2-Suspension
3-Solid Axle and Differential
4-Bulkheads & Drivetrain
5-Driveshaft (ECS & CVD)
6-Front & Rear Suspension
7-Tweak
8-Anti-Roll Bar
9-Battery Fix (OPTIONAL)
10-Bumper & Body
11-Shocks
12-Steering

New Graphite Hubs:
Xray have recently released some additional Graphite hubs for the T4 lineup. The 4° Graphite C-Hub has been out for some time and is known to improve steering on entry, and in general makes the car turn better. This has been the go-to c-hub on asphalt for many on the Xray team, though it is not needed on high bite carpet. The Graphite rear hub tends to make the car more stable, especially on corner entry. We are still working on gathering input on the new Graphite steering block, but for the moment feel that it should improve steering response. All Graphite parts are approximately 1g lighter than the Hard or Medium options.

Option Parts to consider:
XRA301196 T4 Graphite Upper Deck 1.6mm V2
XRA301226 Foam Bumper – Hard - highly recommend
XRA302165 Composite Front Suspension Arm 2-Hole – Hard
XRA302169 Composite Front Suspension Arm 1-Hole – Graphite
XRA302803 1.3mm Front Anti-Roll Bar
XRA303169 Composite Rear Suspension Arm 1-Hole – Graphite
XRA303802 1.2mm Rear Anti-Roll Bar
XRA305137 Steel Solid Axle Driveshaft Adapters - HUDY Spring Steel - highly recommend
XRA305242 Composite Drive Shaft Replacement Cap 3.5mm – Orange – Strong (QTY 4)
XRA305351 Aluminum Wheel Hub – Offset “-0.75mm” – Black (QTY 2)
XRA306191 T4 Graphite + Aluminum Fully Adjustable Battery Holder
XRA308264 4S Spring-Set Progressive C=2.5-2.8 (QTY 2)
XRA308276 4S Spring-Set C=2.7 (QTY 2)
XRA308286 4S Spring-Set C=2.6 (QTY 2)
Specific to Asphalt:
XRA302383 Composite C-Hub Right – 4* - Graphite (ECS)
XRA302384 Composite C-Hub Left – 4* - Graphite (ECS)
XRA308039 Aluminum Progressive Shock System – Set (QTY 2)

Specific to Carpet:

XRA301141 T4 Aluminum Flex Chassis 2mm
XRA302375 Composite C-Hub Right – 6* - Hard ***Modification may be required if they don't have the "ECS" stamp.

XRA302376 Composite C-Hub Left – 6* - Hard ***Modification may be required if they don't have the "ECS" stamp.

XRA303711-O Aluminum Rear Lower Suspension Holder – Front – RF
Recent Setups:
3 July 2016 - Alex Hagberg - European Championship - Asphalt - Mod - 2nd
3 July 2016 - Bruno Coelho - European Championship - Asphalt - Mod - 4th
3 July 2016 - Jan Ratheisky - European Championship - Asphalt - 13.5 - TQ + Win

29 June 2016 - Max Kuenning - Reedy - Asphalt - Mod - 4th
29 June 2016 - Keith Yu - Reedy - Asphalt - 13.5 - TQ + 2nd
29 June 2016 - Eric Anderson - Reedy - Asphalt - 13.5 - 3rd

15 May 2016 - Bruno Coelho - ETS Rd 4 Riccione - Asphalt - Mod - TQ + Win
15 May 2016 - Mattia Collina - ETS Rd 4 Riccione - Asphalt - 13.5 - Win

17 April 2016 - Max Kuenning - MHIC - Carpet - Mod - 4th

10 April 2016 - Bruno Coelho - ETS Rd 3 Wels - Carpet - Mod - 2nd
10 April 2016 - Alex Hagberg - ETS Rd 3 Wels - Carpet - Mod - 4th
10 April 2016 - Jan Ratheisky - ETS Rd 3 Wels - Carpet - 13.5 - TQ + Win

22 March 2016 - Paul LeMieux - Canadian Nats - Carpet - Mod - TQ + Win
22 March 2016 - Luke Pittman - Canadian Nats - Carpet - Mod - 3rd

6 March 2016 - Chris Adams - ROAR Nats - Carpet - Mod - TQ + Win
6 March 2016 - Craig Xavier - ROAR Nats - Carpet - 17.5 - 4th
6 March 2016 - Eric Anderson - ROAR Nats - Carpet - 17.5 - 5th

6 February 2016 - Bruno Coelho - ETS Rd 2 Koblenz - Carpet - Mod - TQ + Win
6 February 2016 - Alex Hagberg - ETS Rd 2 Koblenz - Carpet - Mod - 2nd

31 January 2016 - Alex Hagberg - Snowbirds - Carpet - Mod - TQ + Win
31 January 2016 - Jan Ratheisky - Snowbirds - Carpet - All - See Comments
31 January 2016 - Drew Ellis - Snowbirds - Carpet - 13.5 - 4th
31 January 2016 - Robbie Dodge - Snowbirds - Carpet - 17.5 - Win

13 December 2015 - Bruno Coelho - ETS Rd 1 Hrotovice - Carpet - Mod - 3rd
13 December 2015 - Alex Hagberg - ETS Rd 1 Hrotovice - Carpet - Mod - 4th
13 December 2015 - Olly Jeffries - ETS Rd 1 Hrotovice - Carpet - Mod - 7th
13 December 2015 - Jan Ratheisky - ETS Rd 1 Hrotovice - Carpet - 13.5 - TQ + Win

29 November 2015 - Paul LeMieux - US Indoor Champs - Carpet - Mod - TQ + Win

25 October 2015 - Eric Anderson - Stock Wars - Carpet - 17.5 - 2nd

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Old 08-19-2016, 10:13 PM   #916
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Originally Posted by PACaSteel View Post
I'll be the contrarian here. I'd say changing belts every time you chip a tooth is a waste. Playing hurt is one reason we went to HTD drives over chains in the first place. The teeth flex and compress as they ride over the sprocket, survive slippage, and have small rocks and debris run through it all the time. A well worn belt will have missing teeth, be significantly stretched out, and have some twist from irregular wear yet still not slip and have no significant loss in power transfer.

From an engineering point of view, you are more likely to have slippage problems from initial stretch of a new belt than loss because of a single damaged tooth.
I agree. It will definately do for practice purposes. When it comes to raceday though, i hate taking chances. If i get a torn belt during the race i would blame myself for not changing it when i knew it already had some wear! So i think it all boils down to everyone's expectations.
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Old 08-19-2016, 10:18 PM   #917
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Hi all, a question regarding the progressive spring (2.5-2.8 or 2.3-2.6). Do they have top side and bottom side? Side view of the progressive spring shows that distance between coils varies. i.e. from wider to narrower or the other way round depends on which side the spring is standing on. Or I can just ignore that?
They will do the same job no matter which side is on the top or bottom! I just like to have everything uniform, but that has nothing to do with how the springs work. Its my obsessive disorder!
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Old 08-19-2016, 10:22 PM   #918
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Dump out the old, take gears out, spray out everything with motor spray, replace oil and put it back together.
I use this method and clean with brake cleaner Coming to think of it though as someone hinted further up, is it possible that the o rings expand with the chemical making the diff bind a little? I would love to have your views on this.
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Old 08-20-2016, 01:07 AM   #919
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They will do the same job no matter which side is on the top or bottom! I just like to have everything uniform, but that has nothing to do with how the springs work. Its my obsessive disorder!
Thanks!
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Old 08-20-2016, 02:02 AM   #920
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Originally Posted by buzz777 View Post
I use this method and clean with brake cleaner Coming to think of it though as someone hinted further up, is it possible that the o rings expand with the chemical making the diff bind a little? I would love to have your views on this.
Most people do not use the O-rings when rebuilding the diff, it works fine with no leaking without them
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Old 08-20-2016, 01:48 PM   #921
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Most people do not use the O-rings when rebuilding the diff, it works fine with no leaking without them
You'll still want the white orings around the outdrives, and I'd avoid cleaning them with brake cleaner.
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Old 08-22-2016, 01:13 AM   #922
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Default Gearing for High Speed Track

Hi guys, just a quick question. What is the recommended gearing combo for high speed big layout tracks on a 5.5T motor?
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Old 08-22-2016, 05:31 AM   #923
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I've only ran a 4.5t but I would start a 5.5t at 7.6fdr and adjust as needed based on your motor. This assumes you will be running boost/turbo.
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Old 08-22-2016, 09:29 AM   #924
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You'll still want the white orings around the outdrives, and I'd avoid cleaning them with brake cleaner.
Sometimes you need to rethink your old startegies. First remove rhe internql silcone o-rings then clean with chemicals. I think silicone o-rings tend to expand when in contact with such chemicals.
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Old 08-23-2016, 03:18 AM   #925
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Hey guys, do you have clues as to what's being changed updated in the 2017 version?
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Old 08-24-2016, 02:08 PM   #926
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will someone please tell me how thick the stock xray foam bumper is? thanks in advance.
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Old 08-25-2016, 08:33 AM   #927
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What are the advantages/disadvantages of running 48p over 64p spur gears?
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Old 08-25-2016, 09:15 AM   #928
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Originally Posted by LOW ET View Post
will someone please tell me how thick the stock xray foam bumper is? thanks in advance.
The stock bumper is 15mm thick
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Old 08-25-2016, 09:17 AM   #929
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What are the advantages/disadvantages of running 48p over 64p spur gears?
48p is more durable when running outdoors

64p offers smaller FDR changes when changing pinions compared to 48p
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Old 08-25-2016, 02:49 PM   #930
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The stock bumper is 15mm thick
thanks
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