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Old 04-05-2017, 02:15 AM   -   Wikipost
R/C Tech Forums Thread Wiki: Xray T4'17
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Welcome to the XRAY T4'17 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 2017:
The T4'17 comes available with either a Graphite chassis, or Aluminum Flex chassis. We recommend the Graphite chassis for starting on asphalt, and the Aluminum Flex for starting on carpet. The 2017 also comes standard with the floating swing rack as an option, and the Composite Graphite arms included. Most of the team prefers the Graphite arms for both asphalt and carpet, though sometimes Hard arms may be ideal for asphalt depending on the conditions. This year's car also comes with the new "In-line Flex Adjustment" which provides many more flex adjustments than in the past allowing you to focus & fine-tune on forward/back flex and side-to-side flex both together & independently. Additionally, the Ackermann has been moved back by 1mm and the spacing of the RF blocks is wider, creating 0.5° less rear toe from previous T4 models.

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

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. 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. We are working on getting more info on the turnbuckle & asphalt applications.

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:
XRA301196 T4 Graphite Upper Deck 1.6mm V2
XRA302254 Composite Steering Block - Graphite
XRA302334 Aluminum C-Hub Block - Caster
0° - Orange *Only for ARS*
XRA302383 Composite C-Hub Right – 4
° - Graphite (ECS)
XRA302384 Composite C-Hub Left – 4
° - Graphite (ECS)
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
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)

XRA308039 Aluminum Progressive Shock System – Set (QTY 2) *Only for asphalt*

Recent Setups:
Bruno Coelho - IIC 2016 - High Bite Carpet - Modified
Alex Hagberg - AOC HK 2016 - Med Bite Asphalt - Modified
Jan Ratheisky - AOC HK 2016 - Med Bite Asphalt - 13.5
Chris Adams - Halloween Classic - High Bite Carpet - Modified
Chris Adams - ROAR Region 9 - Med Bite Asphalt - Modified
Craig Xavier - US Indoor Champs - High Bite Carpet - 17.5
Bruno Coelho - ETS Rd1 Hrotovice - Med Bite Carpet - Modified
Craig Xavier - Stock Wars - High Bite Carpet - 17.5
Jan Ratheisky - DHI Cup - Med Bite Carpet - 13.5
Chris Adams - Texas EOS Rd 1 - High Bite Carpet - Modified
Alex Hagberg - Snowbird Nationals - High Bite Carpet - Modified
Robbie Dodge - Snowbird Nationals - High Bite Carpet - 17.5
Jan Ratheisky - TITC - High Bite Asphalt - 13.5
Drew Ellis - ROAR Carpet Nationals - High Bite Carpet - Modified
Eric Anderson - ROAR Carpet Nationals - High Bite Carpet - 17.5
Martin Crisp - Canadian Nationals - Medium Bite Carpet - Modified
Martin Crisp - Canadian Nationals - Medium Bite Carpet - 17.5
Dan Hamann - MN State Champs - High Bite Carpet - 17.5

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Old 08-25-2016, 04:23 PM   #46
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Quote:
Originally Posted by Barry_Hughes View Post
Preview announced for August 24th by Xray at the worlds
and still not a thing in sight
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Old 08-25-2016, 05:55 PM   #47
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New car is all black apparently...or all black as prototype to mask changes in photos. Pics from worlds:
http://site.petitrc.com/reglages/xray/setupxrayt42016/T42016_AndyMoore_Beijing2016082027/
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Old 08-25-2016, 06:00 PM   #48
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You really think they would give their competitors the newest car?
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Old 08-25-2016, 06:02 PM   #49
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Originally Posted by JeffofSpace View Post
New car is all black apparently...or all black as prototype to mask changes in photos. Pics from worlds:
http://site.petitrc.com/reglages/xra...ing2016082027/
That seems to be what the 'Infinity' drivers are doing as to keep the Xray branding down a notch. Infinity doesn't have their own car right now and have elected to run blacked-out Xrays as a plan b.

The all black is a nice departure.
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Old 08-26-2016, 08:50 AM   #50
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Still no news of the new kit???
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Old 08-26-2016, 04:51 PM   #51
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Still no news of the new kit???
Other than anyone who has seen it in the flesh at the worlds saying "looks no different" - no
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Old 08-26-2016, 10:18 PM   #52
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Originally Posted by MDawson View Post
That seems to be what the 'Infinity' drivers are doing as to keep the Xray branding down a notch. Infinity doesn't have their own car right now and have elected to run blacked-out Xrays as a plan b.

The all black is a nice departure.
Yup the all black is simply something Jilles and Andy had done custom when they picked up their cars. They are simply running '16s as their own choice, given Infinity don't have a EP TC... yet.
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Old 08-27-2016, 12:19 AM   #53
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Quote:
Originally Posted by JeffofSpace View Post
New car is all black apparently...or all black as prototype to mask changes in photos. Pics from worlds:
http://site.petitrc.com/reglages/xra...ing2016082027/
Black on Groskamp's & Moore's car, not others

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Old 08-27-2016, 07:04 PM   #54
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Quote:
Originally Posted by JeffofSpace View Post
New car is all black apparently...or all black as prototype to mask changes in photos. Pics from worlds:
http://site.petitrc.com/reglages/xra...ing2016082027/
Hard to tell what they are really running. For instance, the car in the first shots is running a conventional rear end while the lower shots have the ARS installed with aluminum rear C hubs.

Just Sayin....
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Old 08-27-2016, 08:59 PM   #55
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Is there any more news about when Xray will preview the Xray T4'17?
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Old 08-28-2016, 01:29 AM   #56
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Hard to tell what they are really running. For instance, the car in the first shots is running a conventional rear end while the lower shots have the ARS installed with aluminum rear C hubs.

Just Sayin....
First shots are prior to controlled practice taken by SMJ for marketing.

Second lot with ARS are as run, you can tell by the markings from scrutineering on the motor, chassis and body. Must have fitted a new wing though - has no sticker.
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Old 08-28-2016, 08:43 AM   #57
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Originally Posted by PACaSteel View Post
Hard to tell what they are really running. For instance, the car in the first shots is running a conventional rear end while the lower shots have the ARS installed with aluminum rear C hubs.

Just Sayin....
I can personally confirm that in practise they were all (Bruno, Alex and JJ) switching between std and ARS cars each run. Mainly as I was pitting alongside the Xray team all week.
Come Control practise, qualifying and finals (with a single exception) it was ARS only.
Did hear some rumours that there was a quick switch to the standard rear end on at least one car for A3, but can't confirm that for sure mainly as I was watching finals whilst the cars were being prepped.

The general feeling was that the ARS was quicker as it gave better low speed steering for the tighter sections of the track. And the grip level was high enough to help the consistency. So most Xrays in the pits tended that way.
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Old 08-28-2016, 09:30 AM   #58
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Originally Posted by TryHard View Post
I can personally confirm that in practise they were all (Bruno, Alex and JJ) switching between std and ARS cars each run. Mainly as I was pitting alongside the Xray team all week.
Come Control practise, qualifying and finals (with a single exception) it was ARS only.
Did hear some rumours that there was a quick switch to the standard rear end on at least one car for A3, but can't confirm that for sure mainly as I was watching finals whilst the cars were being prepped.

The general feeling was that the ARS was quicker as it gave better low speed steering for the tighter sections of the track. And the grip level was high enough to help the consistency. So most Xrays in the pits tended that way.


Any chance u could tell why the delayed announcement of the new kit?
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Old 08-28-2016, 02:45 PM   #59
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Any chance u could tell why the delayed announcement of the new kit?
Perhaps the sneak preview did occur at the Xray workshop but cameras weren't allowed and everyone was sworn to secrecy?
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Old 08-28-2016, 02:48 PM   #60
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Perhaps the sneak preview did occur at the Xray workshop but cameras weren't allowed and everyone was sworn to secrecy?
This is what I'm guessing. I'm sure the preview happened, but since us plebs weren't at worlds we don't get to hear anything til the official XRAY announcement.
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