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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 09-22-2016, 03:02 PM   #976
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Originally Posted by Kakaru View Post
Hi guys

My local track is of low traction type. In general, should one be using harder or softer springs to gain more traction on a low grip outdoor track? Currently, I'm using XRay progressive springs of 2.5-2.8 in front and 2.6 at my rear. Look forward to your advice and thank you.
Softer springs and oil for low grip. What you're using is probably a good starting point. You could try 2.5 rear and 2.6 front to go even softer, if the track is smooth.
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Old 09-22-2016, 05:14 PM   #977
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Originally Posted by Kakaru View Post
Hi guys

My local track is of low traction type. In general, should one be using harder or softer springs to gain more traction on a low grip outdoor track? Currently, I'm using XRay progressive springs of 2.5-2.8 in front and 2.6 at my rear. Look forward to your advice and thank you.
Generally you'll want to go softer to allow the chassis to roll more. Another option is go allow your chassis to flex by shimming up your top deck and removing the 4 screws round the lay shaft. Or install the 1.6mm top deck if you have one. The more flex and roll the more traction you should have. Stiffer springs will make the car stay flatter (reduced roll) in the turns and provide less traction.

Softening the car does have a price... More roll and flex will take away the responsiveness of the car. If you feel you are going too soft.. You may want to explore different tires/inserts to see if you can improve traction there.

Good luck!
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Old 09-22-2016, 06:01 PM   #978
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Generally you'll want to go softer to allow the chassis to roll more. Another option is go allow your chassis to flex by shimming up your top deck and removing the 4 screws round the lay shaft. Or install the 1.6mm top deck if you have one. The more flex and roll the more traction you should have. Stiffer springs will make the car stay flatter (reduced roll) in the turns and provide less traction.

Softening the car does have a price... More roll and flex will take away the responsiveness of the car. If you feel you are going too soft.. You may want to explore different tires/inserts to see if you can improve traction there.

Good luck!
Cool. I will try that out next time. As a newbie in this RC car hobby, I always have this question on why do we need a top deck on the car since the belt can still run without the top deck, and also wouldn't it have more overall flex if there is no top deck?
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Old 09-22-2016, 06:47 PM   #979
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Definitely start with tires if you are not sure the ones you are using are good on your track. And I think AJ, "spoiled one," gives some great advice
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Old 09-22-2016, 07:15 PM   #980
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Originally Posted by Kakaru View Post
Cool. I will try that out next time. As a newbie in this RC car hobby, I always have this question on why do we need a top deck on the car since the belt can still run without the top deck, and also wouldn't it have more overall flex if there is no top deck?
Without the top deck, the belt tension would drastically change as the chassis flexes. You want torsional flex (twisting) but you don't want longitudinal flex.
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Old 09-23-2016, 02:22 AM   #981
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Originally Posted by Kakaru View Post
Cool. I will try that out next time. As a newbie in this RC car hobby, I always have this question on why do we need a top deck on the car since the belt can still run without the top deck, and also wouldn't it have more overall flex if there is no top deck?
Without a top deck, the belt would come off very easily, VERY easily when running.
Yes, we want flex, but we need to control the amounts.
It would reduce the control of the flex. We've all had a race or two where we've forgotten to tighten all the top deck screws, the end result is a car that 'wallows' side to side along straights etc and is far too inconsistent.
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Old 09-23-2016, 02:27 AM   #982
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Without a top deck, the belt would come off very easily, VERY easily when running.
Yes, we want flex, but we need to control the amounts.
It would reduce the control of the flex. We've all had a race or two where we've forgotten to tighten all the top deck screws, the end result is a car that 'wallows' side to side along straights etc and is far too inconsistent.
I see... I guess there's a lot for me to learn along the way. Thanks for your reply.
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Old 09-23-2016, 04:55 AM   #983
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anyone have a black carpet setup.Im lost
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Old 09-24-2016, 01:47 PM   #984
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https://drive.google.com/file/d/0B4p...ew?usp=sharing

Not so different from stock, but hard aluminum chassis, all the screws in the bottom of the motor mount. basically made the car as rigid as possible. lots of people run a stiffer dif than this but i found the car didn't complete the turn quickly enough as im not as ham fisted on corner exit i guess heh.
glueing the crap out of the tires and taking out droop made the car much better than when it started. I had problems with the sweeps coming unglued and had to really glue the crap out of both sides of the tire. car was pretty easy to drive though most people in my circle hate my radio setup so much as to not try to drive it heh.
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Old 09-24-2016, 02:31 PM   #985
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anyone have a black carpet setup.Im lost
Have you glued the front side walls of your tires?

Snowy.
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Old 09-24-2016, 03:45 PM   #986
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On med-high grip (by national standards not club racing) glue all 4-takes the twich and edge away. Also, reduce camber all around by 1* atleast.
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Old 09-25-2016, 05:53 PM   #987
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So, back to my bumper debate-with the most dense xray t3 bumper, my sedan is 52/48 front to rear bias. If i take the bumper off, its 49/51 (f/r). My question is what bumper does everyone use? Is it better to be rear heavy, or 50/50? What is the t3 heavy bumper weight vs. -another dense option? I need to also be mindful of the cars weight, as its currently 1349.8 grams.
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Old 09-26-2016, 02:45 AM   #988
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So, back to my bumper debate-with the most dense xray t3 bumper, my sedan is 52/48 front to rear bias. If i take the bumper off, its 49/51 (f/r). My question is what bumper does everyone use? Is it better to be rear heavy, or 50/50? What is the t3 heavy bumper weight vs. -another dense option? I need to also be mindful of the cars weight, as its currently 1349.8 grams.
I use Reflex Racings heavy bumper as it's bigger and only a couple of grams heavier than the kit bumper.
http://www.reflexracing.net/RSD-XRAY...15_p_1769.html
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Old 09-26-2016, 08:04 AM   #989
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anyone have a black carpet setup.Im lost
If you're having traction roll issues, like the others have mentioned, glue your front sidewalls about 1mm above the lettering (Gravity, Jaco). Then, reduce your front camber until the car stays flat on the track. You might need to go as low as .5. I find that fine tuning with camber rather than adding more glue works well and gives you some flexibility to adjust to grip levels. If it's low earlier in the day, add some back to get more steering.

I like a little glue on the rear sidewalls (not quite to top of letters) to help calm the cars down, but there's a lot of different opinions on the subject. If you do too much the car will do weird grip release things in the sweeper. Lots of people don't use any at all. That's something you can experiment with, but it's more fine tuning and not something you need to do right away.

If you want the car to rotate more on the black rug, join the club. Seriously, though, let's see what setups come out of IIC next week.
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Old 09-26-2016, 08:21 AM   #990
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Does anyone have the weight of the hard xray t3 front bumper? I could weigh mine but its a major pita to take the bumper all the way apart just to get a weight. Also, do you guys perfer 50/50, or more weight in the back?
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