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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 04-10-2018, 04:31 PM
  #661  
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The wiki (first sticky post) is all messed up for me, is that occurring for anyone else?
I was trying to work out the best spares to keep in hand, and if I should grab the graphite c-hubs and whatever else) for very low grip asphalt?
Anyone have a quick list, with part numbers, of what I should have for race days? And also, any feedback on the graphite components for low grip asphalt?

Cheers
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Old 04-13-2018, 01:04 PM
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Has anyone ran alum arms on asphalt ? If so how did they felt ?
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Old 04-16-2018, 11:47 AM
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Those of you using XR10 pro esc... how do you recalibrate
transmitter with motor already soldered? I switched transmitter and esc won’t go to recalibration mode... thx
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Old 04-16-2018, 01:03 PM
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Originally Posted by onenext View Post
Those of you using XR10 pro esc... how do you recalibrate
transmitter with motor already soldered? I switched transmitter and esc won’t go to recalibration mode... thx
Shouldn't matter if your motor is soldered to the ESC unless there is a short/problem within the motor. I would suggest removing the pinion gear to ensure the car doesn't drive off the table . Make sure a sensor cable is attached properly. Also make sure that you do not have solder accidentally bridging connections between motor wires at the ESC, or on the motor. In extreme cases, I've seen solder drip down the contact and bridge the motor connections inside the motor.

General calibration process:

1. Turn Transmitter ON, and make sure EPA is set to 100% for throttle and brake. Ensure trim and subtrim are set to 0.
2. With the ESC off and plugged into a battery and leaving the transmitter's throttle position at neutral, press and hold the power switch until the light begins to blink red, then release the button.
3. With throttle at neutral, click the button. You should hear a single beep.
4. Move and hold the transmitter to full throttle and click the button on the ESC. You should hear two beeps.
5. Move and hold the transmitter to full brake and click the button on the ESC. You should hear three beeps.
6. Move the throttle back to neutral and wait a 3-5 seconds. The ESC should operate correctly. If full throttle gives full brake instead, reverse the throttle channel on the transmitter and repeat the calibration process.

Hope that helps.

-Korey
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Old 04-19-2018, 10:28 AM
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RC MISSION
New T4 Option Parts
T4'18 ULP Shock Shaft Ti-Coated 3x21mm ( Shorter 1mm than Original )
High Quality Progressive Shock Insert w/Piston for T4'18
Suspension Shaft Lubrication Coated for T4
Hard Coated Rear Drive Shaft Set for T4
Hard Coated Universal Dogbone for T4
4.25mm Wheel Hub for T4
Aluminum Center Pulley 20T for T4
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Old 04-19-2018, 02:28 PM
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RC Mission products are awesome!

For those of you in the US, Apex RC and EA Motorsports are the US distributors. Take a look!
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Old 04-20-2018, 04:32 AM
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"Suspension Shaft Lubrication Coated for T4"

I never see the point in decreasing the friction of wishbone suspension shafts? They can be quite snug in the wishbone as they only rotate at the ball end in the suspension mount.

I always check my suspension is free and drops effortlessly under it's own weight but don't worry too much if the shaft is tight in the wishbone. Am I missing something?
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Old 04-20-2018, 04:58 AM
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Originally Posted by dvaid852456 View Post
"Suspension Shaft Lubrication Coated for T4"

I never see the point in decreasing the friction of wishbone suspension shafts? They can be quite snug in the wishbone as they only rotate at the ball end in the suspension mount.

I always check my suspension is free and drops effortlessly under it's own weight but don't worry too much if the shaft is tight in the wishbone. Am I missing something?
I always polish all metal suspension components (ballstuds, hinge pins and shock shafts) with Gravity RC Polish because I feel it improves consistency when side-load is applied during cornering.
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Old 04-20-2018, 09:25 AM
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Originally Posted by dvaid852456 View Post
"Suspension Shaft Lubrication Coated for T4"

I never see the point in decreasing the friction of wishbone suspension shafts? They can be quite snug in the wishbone as they only rotate at the ball end in the suspension mount.

I always check my suspension is free and drops effortlessly under it's own weight but don't worry too much if the shaft is tight in the wishbone. Am I missing something?
When you add a load to the suspension, the force of friction increases between the suspension arm and the hinge pin regardless of quality of fitment. The coating on the hinge pins is ultra slippery (more so than just polishing), and allows the suspension to move more freely under load. They are some of my favorite parts from RC mission.
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Old 04-20-2018, 09:35 AM
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Originally Posted by Korey Harbke View Post
When you add a load to the suspension, the force of friction increases between the suspension arm and the hinge pin regardless of quality of fitment. The coating on the hinge pins is ultra slippery (more so than just polishing), and allows the suspension to move more freely under load. They are some of my favorite parts from RC mission.
your coffee break is over..j/k
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Old 04-20-2018, 09:44 AM
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Originally Posted by OVA View Post
your coffee break is over..j/k
Multi-tasking

Go back to working on the Porsche :P
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Old 04-20-2018, 09:51 AM
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Originally Posted by Korey Harbke View Post
Multi-tasking

Go back to working on the Porsche :P
yes sir , waiting set of racing valve spring and the custom high lift cam.hopefully today
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Old 04-23-2018, 09:06 AM
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Does anyone have any insight on if the 2019 car will be a T4, or a redesigned T5?
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Old 04-23-2018, 09:15 AM
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Originally Posted by Darrylt3to4e View Post
Does anyone have any insight on if the 2019 car will be a T4, or a redesigned T5?
The Xray TC platform will always be T4. There will never be a T5.
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Old 04-23-2018, 03:57 PM
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Originally Posted by Darrylt3to4e View Post
Does anyone have any insight on if the 2019 car will be a T4, or a redesigned T5?
T4 - is sort of used as an acronym for Touring Car 4WD if I recall. So it will remain T4

NT1 is Nitro Touring 1/10 scale if I recall.

Etc
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