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Old 03-17-2017, 02:10 AM   -   Wikipost
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 02-05-2017, 10:44 AM   #1126
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Quote:
Originally Posted by Steve89 View Post
So I've found to go from the 16 to the 17 you need the below:

- Strong & Light Bumper
- Steering Posts
- Layshaft Bulkhead
- Motor Mount
- Motor Mount brace
- Shims for steering and layshaft bulkheads
- Alu Servo Mount
- Graphite Servo Mount Plate
- Graphite stiffener
- Upper and lower decks

So going by that I should only really need the ARS kit.
The steering posts changed?
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Old 02-05-2017, 02:07 PM   #1127
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Quote:
Originally Posted by tbrymer View Post
The steering posts changed?
No, they moved back 1mm, but that's part of the chassis, not the posts
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Old 02-05-2017, 03:19 PM   #1128
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Originally Posted by Skiddins View Post
No, they moved back 1mm, but that's part of the chassis, not the posts
OK, that's what I thought. 1mm shims should get it back to the previous versions position.
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Old 02-05-2017, 05:53 PM   #1129
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Cheers for the input guys, will see how I go getting the car up to spec, need to wait for it to get delivered first.
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Old 02-06-2017, 01:28 AM   #1130
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Quote:
Originally Posted by tbrymer View Post
OK, that's what I thought. 1mm shims should get it back to the previous versions position.
Yes, well, sort of. The attaching points will then be the same as before, but the pivot point has moved backwards so no matter what you do it will be slightly different.

Not that I could tell any difference
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Old 02-22-2017, 03:50 AM   #1131
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Default Purpose of adding 1mm shim between upper deck and bulkheads

Hi guys

All the XRay T4 guys at my track added a 1mm shim between the upper deck and the bulkheads. The setup manual doesn't state this step. Do most of you all do that too? If so, what's the reason of adding the 1mm shims?

Thank you.
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Old 02-22-2017, 04:43 AM   #1132
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Quote:
Originally Posted by Kakaru View Post
Hi guys

All the XRay T4 guys at my track added a 1mm shim between the upper deck and the bulkheads. The setup manual doesn't state this step. Do most of you all do that too? If so, what's the reason of adding the 1mm shims?

Thank you.
I feel that raising the topdeck increases flex which increases traction and steering. I do it sometimes but not always. I feel like more flex at the topdeck whether it be raising it or going to a 1.6mm topdeck will help actually calm the car down if you're traction rolling on carpet. It seems to smooth it out initially, though it does make more grip in the center of the corner.
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Old 02-22-2017, 06:15 AM   #1133
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Originally Posted by R Dodge View Post
I feel that raising the topdeck increases flex which increases traction and steering. I do it sometimes but not always. I feel like more flex at the topdeck whether it be raising it or going to a 1.6mm topdeck will help actually calm the car down if you're traction rolling on carpet. It seems to smooth it out initially, though it does make more grip in the center of the corner.
So increase overall traction and steering are the main reasons. Now that I know the reason. Can I apply the same theory of another 1mm shims to the upper deck to other cars like Tamiya TRF419x, so as to increase overall traction and steering?
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Old 03-01-2017, 08:42 PM   #1134
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Guys, suggestions to keep the rear of the car from breaking away coming out of corners on power please?. Asphalt medium to low grip.
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Old 03-01-2017, 10:06 PM   #1135
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Guys, suggestions to keep the rear of the car from breaking away coming out of corners on power please?. Asphalt medium to low grip.
softer diff, more toe in, more front droop (lower downstop), adding a roll center shim on the bulkheads. which one to try first depends on your setup, eg if you already have a 2000 diff, softer won't probably help much.
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Old 03-01-2017, 10:13 PM   #1136
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Thanks, I have 5k currently, will revert to 2k and a 3k as back up. Have 2mm shim inner front camber link and 0.5 in the rear inner. 2.6 rear springs and 2.7 front. rears shocks all the way in and front 2 from inner position. 1.4 fr sway bar, 1.3 rear. 550 hudy shock oils, thinking I should go softer, maybe 450. Track is outdoors and bumpy.
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Old 03-02-2017, 01:02 AM   #1137
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Originally Posted by rcdreamer View Post
Thanks, I have 5k currently, will revert to 2k and a 3k as back up. Have 2mm shim inner front camber link and 0.5 in the rear inner. 2.6 rear springs and 2.7 front. rears shocks all the way in and front 2 from inner position. 1.4 fr sway bar, 1.3 rear. 550 hudy shock oils, thinking I should go softer, maybe 450. Track is outdoors and bumpy.
From that setup I would first try rear shocks into 2nd hole as well, and add rear inner camber link shims. The safest bet though is usually to start with the basic setup and adjust from there in small steps.
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Old 03-02-2017, 01:22 AM   #1138
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Already covered really but I'd go:

2k diff
450 oil
1mm rear link, 1.5mm front

You'll have tons of traction once you've done that.
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Old 03-02-2017, 02:19 AM   #1139
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Quote:
Originally Posted by Kakaru View Post
So increase overall traction and steering are the main reasons. Now that I know the reason. Can I apply the same theory of another 1mm shims to the upper deck to other cars like Tamiya TRF419x, so as to increase overall traction and steering?
Only one way to find out

Results will depend on the flex points etc on the chassis' and top deck.
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Old 03-03-2017, 04:46 AM   #1140
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So I've just rebuilt my t4'15 which I want to eventually convert to 16. My used kit I bought didn't come with the eccentric bushings. Does anyone know how many I should have? I found some on eBay just want to know how many I need to buy?

https://www.ebay.com.au/itm/131510370965
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