262LikesXray T4 18
07-17-2018, 03:49 AM - Wikipost
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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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10-29-2017, 06:12 AM
#317
The improvements made to the '18 over the '17 focus on mass centralization and lowering the CG. Also the changes are relatively small, yet they should yield a marked result on the track.
For someone that wishes to convert a '17 to an '18, you have two options, you can do it all, which involves getting the new chassis plate and motor/layshaft mounts, as well as shocks and shock towers and top deck(s). Or just update the shocks and towers. The benefit of doing just the shocks is the lower CG, which, in my opinion will see the biggest benefit on hi-traction tracks. One other side benefit is you will have the SLP shocks and towers as a tuning option. Doing the chassis and mounts moves the motor in 1mm (mass centralization) and adds more mounting holes to tune rear flex. Although this is a beneficial improvement, it is not as significant as the shocks. The new top deck will work on the '17, and offers some extra clearance around the motor.
As I run mainly on hi-traction black carpet, I would have gotten the solid '18 chassis in either case, so it made the most sense to just upgrade one of my '17, as it only had one race event on it.
10-29-2017, 06:31 PM
#318
Tech Rookie
10-30-2017, 11:17 AM
#319
is everyone using the same weight oil in the new ULP shorter shocks as they used in the SLP T4 shocks?
10-30-2017, 02:55 PM
#320
Tech Initiate
Ready to build
Yeah! Finally my kit arrived today.
The box is tiny compare to my 1/8 buggy...
Is anyone trying PSS shocks on 18?
The box is tiny compare to my 1/8 buggy...
Is anyone trying PSS shocks on 18?
10-30-2017, 04:46 PM
#321
10-31-2017, 01:29 AM
#323
10-31-2017, 04:49 AM
#324
Tech Initiate
In general, do you guys think that Rubber tire on Ozite is considered high traction and justifies the aluminum chassis version?
My initial thought was "high traction" was basically foam tire on ozite = aluminum chassis. All other combinations were the graphite chassis...
What does everyone else think? TI am trying to decide which chassis to go with..
My initial thought was "high traction" was basically foam tire on ozite = aluminum chassis. All other combinations were the graphite chassis...
What does everyone else think? TI am trying to decide which chassis to go with..
10-31-2017, 04:56 AM
#325
In general, do you guys think that Rubber tire on Ozite is considered high traction and justifies the aluminum chassis version?
My initial thought was "high traction" was basically foam tire on ozite = aluminum chassis. All other combinations were the graphite chassis...
What does everyone else think? TI am trying to decide which chassis to go with..
My initial thought was "high traction" was basically foam tire on ozite = aluminum chassis. All other combinations were the graphite chassis...
What does everyone else think? TI am trying to decide which chassis to go with..
1) the surface. Some ozite tracks can develop a really nice, dark groove with a lot of traction. That is generally considered high-bite enough to warrant an aluminum chassis
2) the tires. Some rubber tires generate more grip than others. For instance, Jaco Blues are softer and make more grip than Gravity Type C.
I would take both of these factors into account when making a decision. If your track usually has a nice sticky groove and the spec tires is Jaco Blue, I would recommend a solid alum. chassis. If your track runs Gravity tires, you could go with either the flex or solid alum. If your track doesn't groove up very well, you might consider the carbon or maybe alum. flex.
10-31-2017, 09:07 AM
#327
FYI: AMain has their stock in now, and my aluminum chassis order shipped today.
I've been running Associated 35wt oil in my TC's up until now, any recommendations for my T4?
And what are we liking for the rear diff for gray carpet on Jaco Blues? I'll be running this in 17.5 on a small track for the most part, with a few visits to a large track through the year.
I've been running Associated 35wt oil in my TC's up until now, any recommendations for my T4?
And what are we liking for the rear diff for gray carpet on Jaco Blues? I'll be running this in 17.5 on a small track for the most part, with a few visits to a large track through the year.
10-31-2017, 10:02 AM
#328
FYI: AMain has their stock in now, and my aluminum chassis order shipped today.
I've been running Associated 35wt oil in my TC's up until now, any recommendations for my T4?
And what are we liking for the rear diff for gray carpet on Jaco Blues? I'll be running this in 17.5 on a small track for the most part, with a few visits to a large track through the year.
I've been running Associated 35wt oil in my TC's up until now, any recommendations for my T4?
And what are we liking for the rear diff for gray carpet on Jaco Blues? I'll be running this in 17.5 on a small track for the most part, with a few visits to a large track through the year.
I would build the diff with 7 or 8k. Last year I tested this on a small track with high-bite ozite and 5k felt better, but 8k was always faster.
10-31-2017, 11:03 AM
#330
Flex is all thats been available in the states for alum chassis up until this week. I think flex is fine for races like IIC and birds where grip is high but not crazy. For races with a lot of traction I think you will see the solid being the preferred choice