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R/C Tech Forums Thread Wiki: Xray T4 2016
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Welcome to the XRAY T4'16 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.

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
Utilizing Exponential and RMode on the M12S
How to mount weight on your chassis Part2

Team driver Tim Wahl posted some very useful tips on Facebook as he worked through building a new kit.

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

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.

Option Parts to consider:
XRA301196 T4 Graphite Upper Deck 1.6mm V2
XRA301226 Foam Bumper – Hard - highly recommend
XRA302165 Composite Front Suspension Arm 2-Hole – Hard
XRA302169 Composite Front Suspension Arm 1-Hole – Graphite
XRA302803 1.3mm Front Anti-Roll Bar
XRA303169 Composite Rear Suspension Arm 1-Hole – 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)
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)
Specific to Asphalt:
XRA302383 Composite C-Hub Right – 4* - Graphite (ECS)
XRA302384 Composite C-Hub Left – 4* - Graphite (ECS)
XRA308039 Aluminum Progressive Shock System – Set (QTY 2)

Specific to Carpet:

XRA301141 T4 Aluminum Flex Chassis 2mm
XRA302375 Composite C-Hub Right – 6* - Hard ***Modification may be required if they don't have the "ECS" stamp.

XRA302376 Composite C-Hub Left – 6* - Hard ***Modification may be required if they don't have the "ECS" stamp.

XRA303711-O Aluminum Rear Lower Suspension Holder – Front – RF
Recent Setups:
3 July 2016 - Alex Hagberg - European Championship - Asphalt - Mod - 2nd
3 July 2016 - Bruno Coelho - European Championship - Asphalt - Mod - 4th
3 July 2016 - Jan Ratheisky - European Championship - Asphalt - 13.5 - TQ + Win

29 June 2016 - Max Kuenning - Reedy - Asphalt - Mod - 4th
29 June 2016 - Keith Yu - Reedy - Asphalt - 13.5 - TQ + 2nd
29 June 2016 - Eric Anderson - Reedy - Asphalt - 13.5 - 3rd

15 May 2016 - Bruno Coelho - ETS Rd 4 Riccione - Asphalt - Mod - TQ + Win
15 May 2016 - Mattia Collina - ETS Rd 4 Riccione - Asphalt - 13.5 - Win

17 April 2016 - Max Kuenning - MHIC - Carpet - Mod - 4th

10 April 2016 - Bruno Coelho - ETS Rd 3 Wels - Carpet - Mod - 2nd
10 April 2016 - Alex Hagberg - ETS Rd 3 Wels - Carpet - Mod - 4th
10 April 2016 - Jan Ratheisky - ETS Rd 3 Wels - Carpet - 13.5 - TQ + Win

22 March 2016 - Paul LeMieux - Canadian Nats - Carpet - Mod - TQ + Win
22 March 2016 - Luke Pittman - Canadian Nats - Carpet - Mod - 3rd

6 March 2016 - Chris Adams - ROAR Nats - Carpet - Mod - TQ + Win
6 March 2016 - Craig Xavier - ROAR Nats - Carpet - 17.5 - 4th
6 March 2016 - Eric Anderson - ROAR Nats - Carpet - 17.5 - 5th

6 February 2016 - Bruno Coelho - ETS Rd 2 Koblenz - Carpet - Mod - TQ + Win
6 February 2016 - Alex Hagberg - ETS Rd 2 Koblenz - Carpet - Mod - 2nd

31 January 2016 - Alex Hagberg - Snowbirds - Carpet - Mod - TQ + Win
31 January 2016 - Jan Ratheisky - Snowbirds - Carpet - All - See Comments
31 January 2016 - Drew Ellis - Snowbirds - Carpet - 13.5 - 4th
31 January 2016 - Robbie Dodge - Snowbirds - Carpet - 17.5 - Win

13 December 2015 - Bruno Coelho - ETS Rd 1 Hrotovice - Carpet - Mod - 3rd
13 December 2015 - Alex Hagberg - ETS Rd 1 Hrotovice - Carpet - Mod - 4th
13 December 2015 - Olly Jeffries - ETS Rd 1 Hrotovice - Carpet - Mod - 7th
13 December 2015 - Jan Ratheisky - ETS Rd 1 Hrotovice - Carpet - 13.5 - TQ + Win

29 November 2015 - Paul LeMieux - US Indoor Champs - Carpet - Mod - TQ + Win

25 October 2015 - Eric Anderson - Stock Wars - Carpet - 17.5 - 2nd

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Old 02-26-2016, 01:51 PM   #571
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I have and run both cars almost every weekend. Both are great. I would personally get a 16 if you have a choice. If cost is a factor go for the 14. Make sure if you get a used one make sure it has the xray ecs's and not some 3rd party dcj.
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Old 02-26-2016, 02:26 PM   #572
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Quote:
Originally Posted by R Dodge View Post
One of the best features of the '16, and I'm surprised it hasn't been mentioned, is that it comes with ECS' in the kit.
It's ironic that everyone forgets to mention that now, considering so many racers complained constantly about the absence of the ECS driveshafts in past kits.
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Old 02-26-2016, 05:38 PM   #573
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Im shocked it hasn't been standard equipment for YEARS already. pretty much everyone else sells their cars with them at a lower price point. sure they are not xray ecs but they do the same thing. as well if you maintain them.
not gonna lie though, the awsomatix ones with the screw on caps are pretty damn nice. it was tough to pick between the two cars. i might have got an a800 if not for so much local peer pressure heh.

would also be nice to get the kit with a choice of chassis rather than having to spend another $100 but meh. it is what it is.
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Old 02-27-2016, 08:45 AM   #574
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I've had my '16 T4 to couple of our local club races and couple training sessions. We race on carpet and while I don't have anything to compare to I'd call it medium grip at best. Stock carpet setup was descent but main problem was that rear of car was sliding out very easy. So, I tried to make rear softer by removing rear sway bar, moving top of rear shocks all the way in and increased droop both rear and front to about 3.2mm. It's quite easy to drive it now when traction is right. I love driving it when everything feels right

So, some questions:
- what droop is everybody using? Stock setup when following downstop measurement, I got droop around 2mm which to me was very difficult to drive, car was sliding around. Does 3.2mm sound about rigth or way too much?
- I'm still trying to find best tire additive. Currently using Hudy Carpet Gripper with CPX2 carpet tires. Can there be such thing as too much additive? Last race I had feeling that one or two of first sessions grip was perfect, but in some of later sessions it felt as if I had less grip. I applied additive around 30-20 min before sessions (about 40-50 min between sessions) and it didn't dried until start. Could it be that tires are soaked with additive from start of day and you should put less at the end of day or maybe put it on only every second session?
- I had 34 pinion/84t spur. FDR 4.7. LRP X20 13.5t motor. With this ration driving was very fun, no sliding But motor temperature was kind of high - 90C/195F. So, I went to 33 pinion. Which lowered temperature, but car was more difficult to drive as had to be more careful with throttle (which I wasn't). Others are even running FDR 5.2 so I'm thinking I have to go even lower on pinion. Any suggestion on how to calm down a car? I'm considering Expo and/or Speed on throttle in transmitter (Sanwa MT4S).
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Old 02-27-2016, 08:56 AM   #575
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Quote:
Originally Posted by maris View Post
I've had my '16 T4 to couple of our local club races and couple training sessions. We race on carpet and while I don't have anything to compare to I'd call it medium grip at best. Stock carpet setup was descent but main problem was that rear of car was sliding out very easy. So, I tried to make rear softer by removing rear sway bar, moving top of rear shocks all the way in and increased droop both rear and front to about 3.2mm. It's quite easy to drive it now when traction is right. I love driving it when everything feels right

So, some questions:
- what droop is everybody using? Stock setup when following downstop measurement, I got droop around 2mm which to me was very difficult to drive, car was sliding around. Does 3.2mm sound about rigth or way too much?
- I'm still trying to find best tire additive. Currently using Hudy Carpet Gripper with CPX2 carpet tires. Can there be such thing as too much additive? Last race I had feeling that one or two of first sessions grip was perfect, but in some of later sessions it felt as if I had less grip. I applied additive around 30-20 min before sessions (about 40-50 min between sessions) and it didn't dried until start. Could it be that tires are soaked with additive from start of day and you should put less at the end of day or maybe put it on only every second session?
- I had 34 pinion/84t spur. FDR 4.7. LRP X20 13.5t motor. With this ration driving was very fun, no sliding But motor temperature was kind of high - 90C/195F. So, I went to 33 pinion. Which lowered temperature, but car was more difficult to drive as had to be more careful with throttle (which I wasn't). Others are even running FDR 5.2 so I'm thinking I have to go even lower on pinion. Any suggestion on how to calm down a car? I'm considering Expo and/or Speed on throttle in transmitter (Sanwa MT4S).
I haven't measure the droop , but the down stop I am using is kit recommended F6/R5
My setup is very close to base carpet setup, but depending on the traction, I will make slight adjustment here and there.
I am actually in the process of getting more steering out of my T4, I can't believe you can get it tail happy with stock setup.

Tire sauce can definitely be a problem. After you sauces you tire, initial few laps are gonna be very twitchy. You just need to run the "black" area in your track, once the traction is gained after a few laps, you should be able to push it.
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Old 02-27-2016, 09:37 AM   #576
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Quote:
Originally Posted by yifuqiao View Post
I haven't measure the droop , but the down stop I am using is kit recommended F6/R5
My setup is very close to base carpet setup, but depending on the traction, I will make slight adjustment here and there.
I am actually in the process of getting more steering out of my T4, I can't believe you can get it tail happy with stock setup.

Tire sauce can definitely be a problem. After you sauces you tire, initial few laps are gonna be very twitchy. You just need to run the "black" area in your track, once the traction is gained after a few laps, you should be able to push it.
Problem is we don't have black area yet as we started TC just couple of month ago. I am almost thinking that traction is closer to what it is on asphalt. But yes, it's a lot of over steer and no pushing at all. Strange it all other way around for you.
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Old 02-27-2016, 05:41 PM   #577
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Quote:
Originally Posted by yifuqiao View Post
I did extensive research before I bought my t4 16.
14 and 16 have different :
1. Sway bar mount, 16 sway bar mount has bearings, while 14 has the "traditional" mounting solution.
2. 16 could use active rear suspension, it is not widely used from what I see, but it is good to have that option.
3. I believe 16 has less max steering throw for higher comer speed compared to 14. I had a trf 419, and you will notice the t4 has less steering throw right away. The 419, imo, has way too much steering for my liking.

I think above all was all that matters to me. There is some other minor things I can't think of right now.
Dude, you should get a 15 or 16. You will be amazed.
Owing Tamiya is expensive, lol, I break at least 10 pairs of c hub after owning 419 for 2 month. While I only broke 1 c hub with my X-ray during 1 month ownership.
Not to mention, I was instantly faster with t4 on our track.
Thank you for pointing out the significant differences. I am in the same exact situation as you were: TRF cars are costing me way more on parts. I am giving T4 a try.
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Old 02-27-2016, 05:56 PM   #578
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Quote:
Originally Posted by R Dodge View Post
One of the best features of the '16, and I'm surprised it hasn't been mentioned, is that it comes with ECS' in the kit.
The 14 I may get has ECS installed.

Quote:
Originally Posted by daleburr View Post
The 15/16 have some nice features like ball-bearing rollbars, but nothing that makes a big difference to performance. I actually found the '14 a bit more consistent as it has a slightly wider chassis.
Thanks for the valuable input!!! Very informative!

Quote:
Originally Posted by Brian Bosley View Post
I have a 14 and a 16, I think my 14 is the better car for some reason.. Not quite sure why

I'd imagine you can find a 14 car fairly cheap.. its hard to reason a 16 having both
I do find a 14 that is within my budget


Quote:
Originally Posted by RobS View Post
Once I put my 2014's setup on my 16 it was night and day better, however the feel is different. Not necessarily in a bad way but I still feel more comfortable with the 14. I don't have a ton of track time on the 2016 though either so that may change.
That is a very interesting piece of information. Thank you!

Quote:
Originally Posted by SDVern View Post
I have and run both cars almost every weekend. Both are great. I would personally get a 16 if you have a choice. If cost is a factor go for the 14. Make sure if you get a used one make sure it has the xray ecs's and not some 3rd party dcj.
After reading all the posts, I am getting a 14 with the ECS. I will get a 16 if I become more advanced. I appreciate everyone's input. You guys really helped me out!!
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Old 02-28-2016, 10:14 PM   #579
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Hey, guys, my name is JD.
I am a new t4 16 owner. Lol,
This is my first ever hobby grade touring car.
Man, I love the color and build quality of the kit!
Amazing kit even for a beginner.
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Old 02-28-2016, 10:53 PM   #580
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Quick question. I've not ran TC since 2013 and not had an xray since the '11 so not overly xlued up on them ATM.

Do the lower diff housings with the bearing rollbar mounts from the 15/16 car fit on the 2014 car?

Cheers

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Old 02-29-2016, 06:40 AM   #581
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What are people using to add weight? I have to add 50g to the car. I'm running a T4'16 w/Low Profile Lipo, Avid chassis, 30g centerline weight already installed. Is there any sort of brass plate to put under the battery that people are using?

First race day with the 16 and it was awesome...just like I remember XRay driving like.
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Old 02-29-2016, 07:54 AM   #582
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Weights?
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Old 02-29-2016, 08:22 AM   #583
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Quote:
Originally Posted by Mi4cxl View Post
Quick question. I've not ran TC since 2013 and not had an xray since the '11 so not overly xlued up on them ATM.

Do the lower diff housings with the bearing rollbar mounts from the 15/16 car fit on the 2014 car?

Cheers

Nick
I believe they will fit. I haven't tried it.

Quote:
Originally Posted by dr_hfuhuhurr View Post
What are people using to add weight? I have to add 50g to the car. I'm running a T4'16 w/Low Profile Lipo, Avid chassis, 30g centerline weight already installed. Is there any sort of brass plate to put under the battery that people are using?

First race day with the 16 and it was awesome...just like I remember XRay driving like.
What battery are you using? I just recently began testing the 5000mah Motiv pack and it required 70g more than the 7800 to make 1380. I used the 30g center weight as you mentioned with 2 of these stacked on top of it so they sat on the speed control side of the belt.
https://www.apexrc.com/parts/weights...-pack-ps-bw8s/

I also placed 2 of those in front of the front mount on the rear arms, between the spur and the mount. You must use very thin 2-sided tape to place them there.

Additionally, I used the usual stick-on lead weights between the speed control and the motor, as well as under the swing rack in front of the servo and battery.

https://www.apexrc.com/3racing-balan...10g-3rac-bw04/

Another option as you mentioned if the battery is lightweight, would be a plate under that but I have not used that yet. Motiv has one available now.

http://motivrc.com/#!/%E2%80%9CSHORT...egory=13438640

Finally, there could be a much cleaner & nicer weight option available from Xray in the near future. Last I heard about a week ago they were working on something.
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Old 02-29-2016, 10:56 AM   #584
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That's what I was looking for. It's a Fantom 5000mah pack...didn't have time to order a Motiv or EA pack.

Even after adding the 30g XRay weight, I still needed 50g...SUPER lightweight car. It was SOOO good though.


Floating servo mount or no?
https://www.apexrc.com/parts/xray/XR...with-alu-post/
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Old 02-29-2016, 11:15 AM   #585
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http://www.tqrcracing.com/shop/product_view.asp?p_id=10247
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