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Xray T4 18

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Old 07-17-2018, 03:49 AM   -   Wikipost
R/C Tech Forums Thread Wiki: Xray T4 18
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Welcome to the XRAY T4'18 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 2018:
Similar to 2017, the T4'18 kit comes available in the U.S. with either a Graphite chassis (Part no. XRA300024), or Aluminum Flex chassis (Part no. XRA300024A) along with all of the great features introduced last year. We recommend the Graphite chassis for starting on asphalt, and the Aluminum Flex for starting on carpet. The big changes for 2018 are much lower center of gravity, courtesy of the Ultra Low Profile (ULP) shocks/towers and narrower weight distribution by shifting the motor in towards the center-line of the car. In moving the motor closer to the center, the topdeck and layshaft bulkheads have been re-designed. Also new this year, the motor mount includes more holes which extend further toward the rear of the car to improve traction. With the new shorter shocks, the 2018 will use the same springs as previous T4 models.

What's NEW at T4 2018? Convert your '17 to '18 specs with these parts:

- NEW chassis plate (3 options to chose from, Graphite, Aluminum, Alum. Flex)
- NEW topdeck
- NEW ULP shocks (4mm shorter than 2017)
- NEW ULP shock towers (4mm shorter than 2017)
- NEW Motor mount (1mm narrower than 2017)
- NEW Motor mount plate
- NEW layshaft bulkheads
- NEW 51mm ECS ES driveshafts

301145 T4'18 CHASSIS 2.2MM GRAPHITE
301199 T4'18 UPPER DECK 2.0MM GRAPHITE
302084 ULP SHOCK TOWER FRONT 3.0MM GRAPHITE
303001-O T4'18 ALU LAYSHAFT BULKHEAD RIGHT - ORANGE
303002-O T4'18 ALU MOTOR MOUNT - ORANGE
303003-O T4'18 ALU MOTOR MOUNT PLATE - ORANGE
303085 ULP SHOCK TOWER REAR 3.0MM GRAPHITE
305221 ECS (ES) DRIVE SHAFT 51MM FOR 2MM PIN - HUDY SPRING STEEL(tm) (1)
305334 ECS ES (EXTRA STRONG) DRIVE SHAFT 51MM - HUDY SPRING STEEL(tm) - SET
308043-O ULP ALU SHOCK ADJUSTABLE NUT - ORANGE (2)
308308-O ULP ALU SHOCK ABSORBER-SET - ORANGE (2)
308324 ULP ALU SHOCK BODY (2)
308334 ULP COMPOSITE SHOCK PARTS
308354-O ULP ALU SHOCK CAP-NUT WITH VENT HOLE - ORANGE (2)

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

ULP Shock:

Building the new ULP Shock w/ Zero Rebound by Dominic Quek

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:

XRA301146 T4'18 ALU CHASSIS 2.0MM - SWISS 7075 T6 **For very high traction** (Approx. 108g)
XRA301147 T4'18 ALU FLEX CHASSIS 2.0MM - SWISS 7075 T6 **For high traction** (Approx. 93g)
XRA301169 T4'18 UPPER DECK 1.6MM GRAPHITE
XRA302254 Composite Steering Block - Graphite
XRA302334 Aluminum C-Hub Block - Caster
0° - Orange **Only for ARS**
XRA302383 Composite C-Hub Right – 4
° - Graphite (ECS) **Not recommended for high traction**
XRA302384 Composite C-Hub Left – 4
° - Graphite (ECS) **Not recommended for high traction**
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
XRA308029 ULP ALU PROGRESSIVE SHOCK SYSTEM - SET (2) **Only for asphalt**
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)

Recent Setups:
7-Oct - Alexander Hagberg - IIC - High Traction Carpet - Mod Q2, P2
7-Oct - Craig Xavier - IIC - High Traction Carpet - SuperStock Q5, P5

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Old 07-09-2018, 06:57 PM
  #766  
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Originally Posted by sonny8692 View Post
Has anyone tried putting a 2018 shock tower on a 2016 T4. Or has anyone converted a 2016 suspension to a 2018 (shock towers and shocks)
Just wanted to know if I can upgrade my 2016 to a 2018 suspension.

Thanks
Either car takes the others shocks & shock towers.
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Old 07-10-2018, 03:30 PM
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Originally Posted by mariob62 View Post
Either car takes the others shocks & shock towers.
yes, as long as you take both the shocks & shock towers
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Old 07-10-2018, 03:52 PM
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Originally Posted by mikel33 View Post
yes, as long as you take both the shocks & shock towers
So you can't have one without the other?
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Old 07-13-2018, 11:14 PM
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Originally Posted by sonny8692 View Post
So you can't have one without the other?
pretty sure shock lengths are not the same. they went to very short shocks and lowered the shock towers. towers on the 18 are almost horizontal.
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Old 07-15-2018, 11:08 AM
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.
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Old 07-15-2018, 11:09 AM
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Originally Posted by accord12 View Post
Hi. Is there anyone been to try VIGOR RC Carbon Fiber Chassis 2.25mm xray t4 18 ? and upper deck as well
of course xray products are the best fit but quite low price for practice.
Thanks.
Hi accord12,I would highly recommend the Rc-Cox 2.2mm carbon chassis to you.Our team drivers have tested and proved that the durability and stability is excellent.We have also used it for competition too.Besides,the price is affordable and suitable for practice.I think you should give it a try.
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Old 07-15-2018, 08:17 PM
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Does anyone know how many teeth is the front and rear belt for the T4?
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Old 07-16-2018, 02:38 AM
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Originally Posted by Dan View Post
Does anyone know how many teeth is the front and rear belt for the T4?
T4 : 171 front, 63 rear (3mm).
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Old 07-18-2018, 03:19 AM
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Hi all,
I would like to share our options for xray T4,please check it out
You can also find it on our website http://ppm-rcracing.com/

1)2.2mm Full Carbon Chassis (For X-Ray T4-18)
2)2.0mm Full Carbon Upper Deck (For X-Ray T4-18)
3)50mm Alu. Rear Drive Shift For X-Ray T4-15/16/17/18 (7075 Black)
4)7075 Aluminum Rear 0° C Hub (For X-Ray T4-17,18)
5)FF Low Suspension Mount with Brass (For X-Ray T4-16,17,18)
6)Hard Coated Alum. Front Spool Cups with Drive Shalf Caps (For Xray 2017/18)
7)Alu Light Weight Steering Bell Crank Arm (For X-Ray T4-17,18)
8)Drive Shaft Plastic Caps
9)Extra Hard Foam Bumper (For Xray T4 2017/18)
10)Spring Steel Universal Swing Shaft (For X-Ray T4-15/16/17/18)
11) 22.5g Center Weight

Last edited by PPM RC Racing; 07-18-2018 at 08:34 AM.
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Old 07-18-2018, 08:10 AM
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Where do you buy the RC Cox items in the US?
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Old 07-18-2018, 08:32 AM
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Originally Posted by tbrymer View Post
Where do you buy the RC Cox items in the US?
Hi tbrymer,you can visit our website as we haven’t have dealer in the US.Thanks
PPM-rcracing.com
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Old 07-18-2018, 01:25 PM
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Originally Posted by PPM RC Racing View Post

Hi tbrymer,you can visit our website as we haven’t have dealer in the US.Thanks
PPM-rcracing.com
Dude - slowest web site everrrrr
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Old 07-18-2018, 01:58 PM
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Originally Posted by belewis01 View Post
Dude - slowest web site everrrrr
Odd, loads very quickly for me.
Ggrant likes this.
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Old 07-18-2018, 06:09 PM
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Originally Posted by belewis01 View Post
Dude - slowest web site everrrrr
Hi belewis01,we have Facebook page too
Rc-Cox
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Old 07-27-2018, 09:07 AM
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So I've been trying a black carpet setup on my T4 but that is primarily for slick tires/sedan shell. Using that as a baseline, what sort of changes are you guys adjusting if you were to move to USGT tires?

Just wanted to get some ideas. Still very new to touring car setup on black carpet specifically.
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