Like Tree255Likes

Xray T4 18

    Hide Wikipost
Old 07-17-2018, 03:49 AM   -   Wikipost
R/C Tech ForumsThread Wiki: Xray T4 18
Please read: This is a community-maintained wiki post containing the most important information from this thread. You may edit the Wiki once you have been a member for 90 days and have made 90 posts.
 
Last edit by: R Dodge
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

Print Wikipost

Reply

Old 03-12-2018, 09:45 AM
  #616  
Tech Addict
iTrader: (18)
 
ThrottleKing's Avatar
 
Join Date: Dec 2008
Location: Indianapolis, Indiana
Posts: 535
Trader Rating: 18 (100%+)
Default

So no carbon inline flex adjustment?
ThrottleKing is offline  
Reply With Quote
Old 03-12-2018, 09:53 AM
  #617  
Tech Master
 
Chris Adams's Avatar
 
Join Date: Jan 2006
Location: Dallas,Texas
Posts: 1,016
Default

Originally Posted by KE4PJO View Post
I was needing this Saturday dude...
Next race, look for a bunch of xray guys and then pin point the messy pit and you have found me. Ill be more than happy to help!
KE4PJO likes this.
Chris Adams is offline  
Reply With Quote
Old 03-12-2018, 11:01 AM
  #618  
Tech Addict
 
KE4PJO's Avatar
 
Join Date: Feb 2002
Location: Columbia,Tn.
Posts: 735
Default

Originally Posted by Chris Adams View Post
Next race, look for a bunch of xray guys and then pin point the messy pit and you have found me. Ill be more than happy to help!
I never made it past Drew's "messy" pits...lol
KE4PJO is offline  
Reply With Quote
Old 03-12-2018, 11:16 AM
  #619  
Tech Fanatic
iTrader: (24)
 
Join Date: Apr 2005
Location: north-west Indiana
Posts: 957
Trader Rating: 24 (100%+)
Default

How much chassis drag is too much? I have made some setup changes which have soften my front end in an attempt to get the car to cut into the corner better on turn in. The car now cuts, but it rubbs the chassis on the carpet a lot more too. Rear ride 5.7mm, front 5.4mm, droop 1.5 over rh rear, 1 over rh front. 2.5 springs in front 2.6 in the rear.
JoshuaRC10 likes this.
trilerian is offline  
Reply With Quote
Old 03-12-2018, 11:24 AM
  #620  
Tech Elite
Thread Starter
 
R Dodge's Avatar
 
Join Date: Jul 2008
Posts: 2,735
Default

Originally Posted by Chris Adams View Post
Attached is the Setup that I used at Nats this last weekend. Was the top finishing Xray in 17.5 and I believe I would of finished higher if I had practiced more than 3 times for the weekend with the car. Def had pace in the mains. Only changes are high rear diff, aluminum arms, 15k diff built to book standards and standard front hexes.

Thanks Robbie for the setup!

XRAY ::: Set-up Sheet - T4'18
Glad it worked! Thanks for trying it and congrats on your great result in both classes!

Originally Posted by ThrottleKing View Post
So no carbon inline flex adjustment?
Sorry, I forgot to mention this on the setup sheet! I totally forgot about it until you asked. I used the 7075.it 21g weight with only the front and rear screws from the bottom. No brace above it.
mracer1 likes this.
R Dodge is offline  
Reply With Quote
Old 03-13-2018, 07:48 PM
  #621  
Tech Regular
iTrader: (1)
 
Nuno Gancho's Avatar
 
Join Date: Feb 2006
Posts: 389
Trader Rating: 1 (100%+)
Default

What is the driving feeling difference of having 10g or 20g or 37g on the middle of the car beside achieving minimum weight.

Thanks

Last edited by Nuno Gancho; 03-13-2018 at 09:55 PM.
Nuno Gancho is offline  
Reply With Quote
Old 03-14-2018, 01:48 AM
  #622  
Tech Elite
Thread Starter
 
R Dodge's Avatar
 
Join Date: Jul 2008
Posts: 2,735
Default

Originally Posted by Nuno Gancho View Post
What is the driving feeling difference of having 10g or 20g or 37g on the middle of the car beside achieving minimum weight.

Thanks
If you just tape it down I don't think it really has much effect other than meeting the minimum weight. If you use a weight that screws into the holes in the chassis, you can use the weight to help fine-tune flex. Hope that helps.
Bryan D likes this.
R Dodge is offline  
Reply With Quote
Old 03-14-2018, 02:41 AM
  #623  
Tech Elite
 
Skiddins's Avatar
 
Join Date: Feb 2006
Location: Windsor, UK
Posts: 4,862
Default

Originally Posted by R Dodge View Post
If you just tape it down I don't think it really has much effect other than meeting the minimum weight. If you use a weight that screws into the holes in the chassis, you can use the weight to help fine-tune flex. Hope that helps.
To help prevent 'tuning' flex with the weight I have a couple of 0.5mm shims between it and the chassis. They're the 5mm outer diameter shims to minimize it's effect.
Skiddins is offline  
Reply With Quote
Old 03-14-2018, 08:44 AM
  #624  
Tech Elite
iTrader: (3)
 
Join Date: Jun 2003
Posts: 4,285
Trader Rating: 3 (100%+)
Default

Ty bro
rccartips is offline  
Reply With Quote
Old 03-15-2018, 08:14 AM
  #625  
Tech Master
iTrader: (62)
 
Join Date: Feb 2010
Location: Valley Cottage NY
Posts: 1,952
Trader Rating: 62 (100%+)
Default

Ran the alum arms last night for first time. Car felt good. Need to work on setup. Im going to try Robbie's setup with the alum arms and report back.
Speedychris22 is offline  
Reply With Quote
Old 03-15-2018, 01:41 PM
  #626  
Tech Fanatic
iTrader: (2)
 
Scionara05's Avatar
 
Join Date: Jul 2012
Location: Queens nyc
Posts: 956
Trader Rating: 2 (100%+)
Default

Just asking but is there a veritcal top deck or any has tried it I see alot of different cars coming with options to do both just wondering the difference in handling changes between the 2
Scionara05 is offline  
Reply With Quote
Old 03-16-2018, 02:52 AM
  #627  
Tech Elite
Thread Starter
 
R Dodge's Avatar
 
Join Date: Jul 2008
Posts: 2,735
Default

Originally Posted by Speedychris22 View Post
Ran the alum arms last night for first time. Car felt good. Need to work on setup. Im going to try Robbie's setup with the alum arms and report back.
I think that is how Chris ran his car at Nats. Curious to hear what you think. I haven't run since I did that setup sheet, and didn't have alum. arms at that time.

Originally Posted by Scionara05 View Post
Just asking but is there a veritcal top deck or any has tried it I see alot of different cars coming with options to do both just wondering the difference in handling changes between the 2
I am about 90% sure the factory guys in Europe have tested something maybe a year or 2 ago. I don't have any real proof, or feedback from it. Xray does not have anything in production and I have not seen any aftermarket options either.
Speedychris22 likes this.
R Dodge is offline  
Reply With Quote
Old 03-18-2018, 05:45 PM
  #628  
Tech Elite
iTrader: (15)
 
JEFFs SC10's Avatar
 
Join Date: Sep 2010
Location: Orlandooooo, Fl
Posts: 4,003
Trader Rating: 15 (100%+)
Default

where can I pick up the aluminum arms?
JEFFs SC10 is offline  
Reply With Quote
Old 03-18-2018, 06:16 PM
  #629  
Tech Fanatic
iTrader: (9)
 
Join Date: Feb 2009
Location: Lynnwood, Washington
Posts: 914
Trader Rating: 9 (100%+)
Default

Originally Posted by JEFFs SC10 View Post
where can I pick up the aluminum arms?
https://www.apexrc.com/collections/n...-swiss-7075-t6
malkiy is offline  
Reply With Quote
Old 03-19-2018, 04:54 AM
  #630  
Tech Master
iTrader: (62)
 
Join Date: Feb 2010
Location: Valley Cottage NY
Posts: 1,952
Trader Rating: 62 (100%+)
Default

[QUOTE=R Dodge;15184312]I think that is how Chris ran his car at Nats. Curious to hear what you think. I haven't run since I did that setup sheet, and didn't have alum. arms at that time.

Follow up report while using Robbie’s setup with alum arms, car felt very easy to drive. Very consistent the only change I did was go to 10k in the diff which really didn’t make to much of a change in lap times. I don’t have the solid alum chassis so decided to leave 4 out of 5 screws for flex to compensate. I’m going to test more on wed as the only thing I would like is a bit more rotation middle to exit of the turn. Thanks Robbie!
Ggrant likes this.
Speedychris22 is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service