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Xray T4'17

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Old 07-20-2017, 02:09 AM   -   Wikipost
R/C Tech ForumsThread 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 06-04-2020, 11:40 AM
  #1726  
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Originally Posted by BEMO2019
For all the items that come with it I don't think the price is out of line.
Only if you want a second old roller and what ever else is "thrown in". You should be able to get a '17 or an '18 in that range.

A year and a half ago I picked up a '16 roller in mint condition with box, stickers manual etc all original extra parts for $175USD.
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Old 06-04-2020, 11:59 AM
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Originally Posted by mrreet2001
Only if you want a second old roller and what ever else is "thrown in". You should be able to get a '17 or an '18 in that range.

A year and a half ago I picked up a '16 roller in mint condition with box, stickers manual etc all original extra parts for $175USD.
Sure I understand that you can find deals like you found. I paid $275 for a 16 roller with a few option parts and don't regret it. The person asking the question seems new and getting nearly a running car and a handful of practice tires for $320usd isn't a bad play in my opinion of course.
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Old 06-04-2020, 01:02 PM
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Currently no 17 or 18 for sale in the UK this 16 was my best option for a practicality rtr car to get me started or I could get a yokomo bd9 roller for £190 or a bd7 2015 complete rtr for £200 but not to familiar with that brand.
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Old 06-04-2020, 03:06 PM
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Originally Posted by Jms193
Currently no 17 or 18 for sale in the UK this 16 was my best option for a practicality rtr car to get me started or I could get a yokomo bd9 roller for £190 or a bd7 2015 complete rtr for £200 but not to familiar with that brand.
Depends what your local track supports. The Yokomo isn't bad car.
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Old 06-05-2020, 03:00 AM
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Local track support both t4 and yokomo but seems most people are are running mid motor conversion which is another £150 on top of whatever I pay for the bd9 if i get it. Does t4 do a mid motor conversion? Is the mid motor really worth it for a beginner like myself. Sorry if I'm going of course here as I know it's a t4 post.
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Old 06-05-2020, 03:24 AM
  #1731  
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The Xray is a better car than the Yokomo. The plastics are stronger, and it requires less maintanance. It's also easier to get spare parts. Getting parts for older model Yokomos can be difficult as they usually discontinue them when the new car comes out.

Does the £260 include the pictured electrics? If so then I'd say that's a good deal. Those are good quality electrics, looks like a Hobbywing v3.1 120A, Savox servo, Hobbywing motor. Those will be bullet-proof for a beginner, and fast enough to compete as you get better. And a complete spare car means you'll have a spare of everything should you break it. ('14 and '16 are compatible on all the bits you're likely to break or damage).

Don't worry about mid-motor. If you're just getting into it, rear motor is fine. Mid motor might be worth like a tenth per lap in consistency, but as a beginner you'll have several seconds per lap to come from driving. By the time you're ready to benefit from mid-motor in a couple of years, you'll be ready for a new car anyway.

So I'd say go for it, and enjoy. A used Xray is by far the best option for getting into TC. They're built like tanks, easy to drive, and easy to get parts for.

I run the Bedworth club and we've had lots of rookies join us over the past 6 months. I've directed all of them to Xray, and none of them have regretted it.
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Old 06-05-2020, 03:50 AM
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Yes it comes with hobbywing v10 13.5 motor and xerun v3.1 esc. To be honest I'm just going to go for it as it's all I need apart from rx/rx and it's local to me and it's saves me spending out for electrics for a roller. Thanks to everyone i appreciate all the help I look forward to getting on the track and learning the car
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