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Old 07-20-2017, 02:09 AM   -   Wikipost
R/C Tech Forums Thread Wiki: Xray T4'17
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Welcome to the XRAY T4'17 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. Feel free to add anything you feel is useful to the community!

New for 2017:
The T4'17 comes available with either a Graphite chassis, or Aluminum Flex chassis. We recommend the Graphite chassis for starting on asphalt, and the Aluminum Flex for starting on carpet. The 2017 also comes standard with the floating swing rack as an option, and the Composite Graphite arms included. Most of the team prefers the Graphite arms for both asphalt and carpet, though sometimes Hard arms may be ideal for asphalt depending on the conditions. This year's car also comes with the new "In-line Flex Adjustment" which provides many more flex adjustments than in the past allowing you to focus & fine-tune on forward/back flex and side-to-side flex both together & independently. Additionally, the Ackermann has been moved back by 1mm and the spacing of the RF blocks is wider, creating 0.5° less rear toe from previous T4 models.

What's NEW at T4 2017? Convert your '16 to '17 specs with these parts:

- NEW chassis plate (3 options to chose from below)
- NEW Motor holder
- NEW Motor holder plate
- NEW center shaft holder
- NEW Floating Servo Mount

301142 T4'17 CHASSIS 2.2MM GRAPHITE
301143 T4'17 ALU CHASSIS 2.0MM - SWISS 7075 T6
301144 T4'17 ALU FLEX CHASSIS 2.0MM - SWISS 7075 T6

302536 ALU STEERING POST FOR FLOATING SERVO SAVER (2)
303066-O T4'17 ALU LAYSHAFT BULKHEAD CLOSED L/R - ORANGE
303067-O T4'17 ALU MOTOR MOUNT - ORANGE
303068-O T4'17 ALU MOTOR MOUNT PLATE - ORANGE
306204-O T4'17 ALU SERVO MOUNT - ORANGE
306233 T4'17 GRAPHITE FLOATING SERVO HOLDER 3.0MM
306530 T4'17 GRAPHITE CHASSIS STIFFENER 3.0MM

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
Mastering the Sanwa M12S: Utilizing Exponential and RMode
How to mount weight on your chassis Part2
Mastering the Sanwa M12S: Utilizing TH-Hold

Team driver Tim Wahl posted some very useful build tips for the T4'16 on Facebook as he worked through building a new kit. These tips will still apply on the current model.

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

Center Brace:
The manual indicates using a 2mm shim under the center brace when attaching to the chassis plate. The gap is actually 3mm, so a 3mm shim should be used here.

Tuning Note:
On Carpet we have found that adding screws or doubling up the graphite brace will make the car react quicker to steering input, & change direction faster. Raising the graphite brace off of the aluminum bulkheads by placing a shim under it on the front and rear holes will reduce response. Using the tie-rod will reduce initial response to input, but will generate more in-corner traction or 'side-bite'. Using no brace will generate even more of this 'side-bite' but all of this is at the expense of corner speed. Best to use the tie-rod or no brace only in low-traction conditions. Additionally, the center brace increases forward traction, so removing it will potentially increase wheel-spin out of low speed corners.

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.

ARS Tuning courtesy of Ed (TryHard):
If you set the ARS up with no shims under either inside or outside ball positions, it actually adds toe-in under compression, at around 1° at 5.2mm ride height (how much it adds depends how much the car compresses, obviously )

Adding shims reduces the amount added (1mm under one of the links gives about 0.5°), until the link has 2mm worth of shims (1mm either side, or 2mm on one side) makes the ARS neutral. Adding more shims then turns it into reducing toe in under compression.

Whilst that might sound a bit backwards, it's actually not quite as simple as it sounds. By having the links to add toe, you gain forward traction. Also consider as the car rolls, the inside wheel is in negative compression, and the outside in compression. So the inside is toe-ing out, and the outside toe-ing in, so the whole rear is then 'steering' in the direction of the turn. Obviously the inside wheel has a lot less influence than the outside as it's far less loaded, but the effect is still there.

Optional & Tuning Parts to consider:
XRA301196 T4 Graphite Upper Deck 1.6mm V2
XRA302254 Composite Steering Block - Graphite
XRA302334 Aluminum C-Hub Block - Caster
0° - Orange *Only for ARS*
XRA302383 Composite C-Hub Right – 4
° - Graphite (ECS)
XRA302384 Composite C-Hub Left – 4
° - Graphite (ECS)
XRA302711 Brass Front Lower 1-Piece Suspension Holder - Front - FF
XRA302803 1.3mm Front Anti-Roll Bar
XRA303360 Composite Upright 0° Outboard Toe-In - 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)
XRA305352 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)

XRA308039 Aluminum Progressive Shock System – Set (QTY 2) *Only for asphalt*

Recent Setups:
Bruno Coelho - IIC 2016 - High Bite Carpet - Modified
Alex Hagberg - AOC HK 2016 - Med Bite Asphalt - Modified
Jan Ratheisky - AOC HK 2016 - Med Bite Asphalt - 13.5
Chris Adams - Halloween Classic - High Bite Carpet - Modified
Chris Adams - ROAR Region 9 - Med Bite Asphalt - Modified
Craig Xavier - US Indoor Champs - High Bite Carpet - 17.5
Bruno Coelho - ETS Rd1 Hrotovice - Med Bite Carpet - Modified
Craig Xavier - Stock Wars - High Bite Carpet - 17.5
Jan Ratheisky - DHI Cup - Med Bite Carpet - 13.5
Chris Adams - Texas EOS Rd 1 - High Bite Carpet - Modified
Alex Hagberg - Snowbird Nationals - High Bite Carpet - Modified
Robbie Dodge - Snowbird Nationals - High Bite Carpet - 17.5
Jan Ratheisky - TITC - High Bite Asphalt - 13.5
Drew Ellis - ROAR Carpet Nationals - High Bite Carpet - Modified
Eric Anderson - ROAR Carpet Nationals - High Bite Carpet - 17.5
Martin Crisp - Canadian Nationals - Medium Bite Carpet - Modified
Martin Crisp - Canadian Nationals - Medium Bite Carpet - 17.5
Dan Hamann - MN State Champs - High Bite Carpet - 17.5

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Old 07-12-2017, 07:19 AM   #1366
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Originally Posted by cplus View Post
Plenty. I dramas.
thanks for the feedback. So I guess before this part breaks you either strip the servo gears or bend something else then.
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Old 07-12-2017, 02:29 PM   #1367
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What parts do I need to update a T4 2016 to a 2017? Are the parts really a must have?
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Old 07-12-2017, 03:25 PM   #1368
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Originally Posted by Phillip F View Post
What parts do I need to update a T4 2016 to a 2017? Are the parts really a must have?
I think this was mentioned a few pages back, but off the top of my head, chassis, servo mount, motor mount.

Graphite Chassis (XRA301142)
Servo mount (XRA306204-O)
Servo holder floating (XRA306233)
Motor mount (XRA303067-O)
Layshaft bulkhead (XRA303066-O)
Motor Mount plate (XRA303068-O)

And if you want the chassis brace
Graphite chassis stiffner (XRA306530)

You can put your own turnbuckle chassis stiffner together if you want that.
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Old 07-12-2017, 03:33 PM   #1369
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Originally Posted by Phillip F View Post
What parts do I need to update a T4 2016 to a 2017? Are the parts really a must have?
18 not far.

I'd wait for the chassis and motor mount from that personally.

Get the servo mount now if you want to start collecting. but wait for the rest.
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Old 07-12-2017, 03:41 PM   #1370
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Originally Posted by Phillip F View Post
What parts do I need to update a T4 2016 to a 2017? Are the parts really a must have?
I found these lists back on page 11. I could swear there was something more recent but I stopped looking at page 66.

Hope this helps.

What's NEW at T4 2017?

- NEW chassis plate (2.2mm Carbon, with recording for the new motor mount)
- NEW Motor holder
- NEW Motor holder plate
- NEW center shaft holder
- NEW Floating Servo Mount

301142 T4'17 CHASSIS 2.2MM GRAPHITE
301143 T4'17 ALU CHASSIS 2.0MM - SWISS 7075 T6
301144 T4'17 ALU FLEX CHASSIS 2.0MM - SWISS 7075 T6
302536 ALU STEERING POST FOR FLOATING SERVO SAVER (2)
303066-O T4'17 ALU LAYSHAFT BULKHEAD CLOSED L/R - ORANGE
303067-O T4'17 ALU MOTOR MOUNT - ORANGE
303068-O T4'17 ALU MOTOR MOUNT PLATE - ORANGE
306204-O T4'17 ALU SERVO MOUNT - ORANGE
306233 T4'17 GRAPHITE FLOATING SERVO HOLDER 3.0MM
306530 T4'17 GRAPHITE CHASSIS STIFFENER 3.0MM
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Old 07-16-2017, 02:55 PM   #1371
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Does anyone know of a good alternative to the front ECS driveshafts?
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Old 07-16-2017, 05:14 PM   #1372
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Optional Parts - Roche and Radtec ? XRay T4

I've had very good results with the Roche shafts.
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Old 07-16-2017, 08:02 PM   #1373
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Does anyone know of a good alternative to the front ECS driveshafts?
RC Mission are pretty good.

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Old 07-16-2017, 08:40 PM   #1374
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The Xsquare ones from RC Mart get my vote, had two pairs for almost a year and no issues at all. Plus they have clips

http://www.rcmart.com/spring-steel-x...=595_1077_1571
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Old 07-17-2017, 12:53 AM   #1375
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Quote:
Originally Posted by Troy Carter View Post
Optional Parts - Roche and Radtec ? XRay T4

I've had very good results with the Roche shafts.
Xsquare ECS are good however, you would need to use the special bearings that comes with the package as these are narrower than the xray bearings. Also, it's longer than the 50mm, it's 52mm. Thus, it took out a bit of initial steering for my driving style.

Last edited by alecladanga; 07-17-2017 at 01:04 AM.
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Old 07-17-2017, 04:53 AM   #1376
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Originally Posted by alecladanga View Post
Xsquare ECS are good however, you would need to use the special bearings that comes with the package as these are narrower than the xray bearings. Also, it's longer than the 50mm, it's 52mm. Thus, it took out a bit of initial steering for my driving style.
The special bearing helps to push the joint closer to the kingpin, as that's one of my pet hates with the Xray ECS, is how much the joint moves fore and aft when steering. Having the joints closer inline with the kingpin helps to smooth it out, IMO.
Only ever run 52mm's in the front, so can't really comment on the length difference.
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Old 07-17-2017, 05:32 AM   #1377
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Thanks, the X-Square ones look good and I much prefer the clip design.
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Old 07-17-2017, 07:40 AM   #1378
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Quote:
Originally Posted by TryHard View Post
The Xsquare ones from RC Mart get my vote, had two pairs for almost a year and no issues at all. Plus they have clips

, ,(XP-20002) by X-Square Spring Steel Double Joint Driveshaft 41mm
Interesting; at $26 shipped they're basically disposable, so as long as they don't fail on track they look a good option.

The original Roche ones are a similar design and were mega, I've got a set that are about 3 years old and still going strong in my wet car now. The newer Radtec ones are not quite so good, the tolerances have drifted. Still strong though.
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Old 07-17-2017, 08:26 PM   #1379
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Originally Posted by daleburr View Post
Interesting; at $26 shipped they're basically disposable, so as long as they don't fail on track they look a good option.

The original Roche ones are a similar design and were mega, I've got a set that are about 3 years old and still going strong in my wet car now. The newer Radtec ones are not quite so good, the tolerances have drifted. Still strong though.
Literally have had two sets for over a year (one set in each of my T4's), and have had zero issues. That includes plenty of large 'incidents'..
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Old 07-18-2017, 05:29 AM   #1380
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Literally have had two sets for over a year (one set in each of my T4's), and have had zero issues. That includes plenty of large 'incidents'..
Are they the equivalent of 50 or 52mm?
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