Like Tree251Likes

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 09-15-2017, 12:48 PM
  #76  
Tech Elite
iTrader: (15)
 
JEFFs SC10's Avatar
 
Join Date: Sep 2010
Location: Orlandooooo, Fl
Posts: 3,974
Trader Rating: 15 (100%+)
Default

Will there will be a conversion kit for the 17? New towers, shocks, etc.

I think this lower center of gravity it gonna make this car sick to stay on power in the turns.

Last edited by JEFFs SC10; 09-15-2017 at 01:01 PM.
JEFFs SC10 is offline  
Reply With Quote
Old 09-15-2017, 12:58 PM
  #77  
Tech Master
 
Join Date: Mar 2011
Posts: 1,029
Default

Would be nice - just need the towers and shocks. The rest of the new parts aren't that important. My 2017 is brand new so it would be well worth it to slap on 2 towers and 4 shocks and essentiallyhave the hot car for the indoor season. Would be great for asphalt racers too since they could switch back and forth with the SLP parts. I bet the ULP bits will be hard to come by though
DavidNERODease is offline  
Reply With Quote
Old 09-15-2017, 01:02 PM
  #78  
Tech Elite
iTrader: (15)
 
JEFFs SC10's Avatar
 
Join Date: Sep 2010
Location: Orlandooooo, Fl
Posts: 3,974
Trader Rating: 15 (100%+)
Default

I'll make my indoor alum flex 17 an outdoor car and buy an 18 with alum flex my perm indoor car if the parts dont bolt up.
JEFFs SC10 is offline  
Reply With Quote
Old 09-15-2017, 01:47 PM
  #79  
Tech Initiate
 
Join Date: Jul 2017
Posts: 35
Default Best battery backstop

Which one (options part) battery backstop works the best on t4 17/18?
onenext is offline  
Reply With Quote
Old 09-15-2017, 02:13 PM
  #80  
Tech Regular
iTrader: (4)
 
Join Date: May 2016
Posts: 255
Trader Rating: 4 (100%+)
Default

I haven't seen any pricing or availability info yet. Does anyone have any insight?
JoshuaRC10 is offline  
Reply With Quote
Old 09-15-2017, 04:30 PM
  #81  
Tech Fanatic
iTrader: (1)
 
DirkW's Avatar
 
Join Date: Dec 2013
Location: Germany
Posts: 805
Trader Rating: 1 (100%+)
Default

First shop I've seen it listed over here, it's 50€ more than the '17 has been for the last couple of months (no idea what the '17 cost there when it was released) - hope that will come down a bit, as I was thinking about using the '18 as carpet/indoor car and my '17 for asphalt/outdoor (I prefer to have dedicated cars, rather than to completely change setups ).
DirkW is offline  
Reply With Quote
Old 09-15-2017, 04:54 PM
  #82  
Tech Lord
iTrader: (32)
 
syndr0me's Avatar
 
Join Date: Dec 2004
Location: 5280 Raceway
Posts: 13,207
Trader Rating: 32 (100%+)
Default

Take my money!
syndr0me is offline  
Reply With Quote
Old 09-15-2017, 04:56 PM
  #83  
Tech Initiate
 
Join Date: Jul 2017
Posts: 35
Default

T4 2018 is selling for 589 euros in Europe. My guess is $599 minimum.
onenext is offline  
Reply With Quote
Old 09-15-2017, 05:08 PM
  #84  
Tech Master
iTrader: (6)
 
Join Date: Feb 2014
Location: Kirkland, WA
Posts: 1,073
Trader Rating: 6 (100%+)
Default

Originally Posted by onenext View Post
T4 2018 is selling for 589 euros in Europe. My guess is $599 minimum.
Whoa, that's like $700 here in the states...
Carnage9270 is offline  
Reply With Quote
Old 09-15-2017, 05:08 PM
  #85  
Tech Regular
iTrader: (4)
 
Join Date: May 2016
Posts: 255
Trader Rating: 4 (100%+)
Default

Found it on RCMart for $510
JoshuaRC10 is offline  
Reply With Quote
Old 09-15-2017, 05:14 PM
  #86  
Tech Master
iTrader: (6)
 
Join Date: Feb 2014
Location: Kirkland, WA
Posts: 1,073
Trader Rating: 6 (100%+)
Default

Originally Posted by JoshuaRC10 View Post
Found it on RCMart for $510
Yeah, that is more in line with previous cars.
Carnage9270 is offline  
Reply With Quote
Old 09-15-2017, 05:32 PM
  #87  
Tech Initiate
 
Join Date: Jul 2017
Posts: 35
Default

Originally Posted by JoshuaRC10 View Post
Found it on RCMart for $510
$510 must be pre order special as you get 2017 for $529
onenext is offline  
Reply With Quote
Old 09-15-2017, 10:33 PM
  #88  
Team EAM
iTrader: (79)
 
Join Date: Dec 2001
Location: Murfreesboro, TN
Posts: 9,358
Trader Rating: 79 (100%+)
Default

MAP is 599.00 I would be RCMart hasnt gotten their invoice or cars yet. They will be in for a surprise.

EA
EAMotorsports is offline  
Reply With Quote
Old 09-15-2017, 10:38 PM
  #89  
Tech Regular
iTrader: (4)
 
Join Date: May 2016
Posts: 255
Trader Rating: 4 (100%+)
Default

Originally Posted by EAMotorsports View Post
MAP is 599.00 I would be RCMart hasnt gotten their invoice or cars yet. They will be in for a surprise.

EA
Where have you seen that? If so I think I'll pull the trigger on that rc mart preorder.
JoshuaRC10 is offline  
Reply With Quote
Old 09-15-2017, 10:45 PM
  #90  
Team EAM
iTrader: (79)
 
Join Date: Dec 2001
Location: Murfreesboro, TN
Posts: 9,358
Trader Rating: 79 (100%+)
Default

Originally Posted by JoshuaRC10 View Post
Where have you seen that? If so I think I'll pull the trigger on that rc mart preorder.
Because I am an authorized dealer for them and have 10 kits in route.

EA
EAMotorsports is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service