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Old 03-17-2017, 02:10 AM   -   Wikipost
R/C Tech Forums Thread Wiki: Xray T4 2016
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Last edit by: R Dodge
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 07-31-2016, 03:38 PM   #871
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it looks decent, though I'm not familiar enough with the brand to speak of its quality or longevity. Im always hesitant to use a brand I'm unfamiliar with, or a brand that nobody else at my track is using, especially when it comes to electronics.
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Old 07-31-2016, 03:48 PM   #872
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Let me say this about servos ... Ran savox in all our cars for 2-3 yrs last season I built our new cars with futaba bls-551s and was blown away how much more connected we were to our cars .
Then as a experiment I added New airtronics servos(erb-871) to our usgt cars and being the only difference made we both were able to get better more consistent laps and switched to airtronics thru out all our cars and they are night and day better than a 1251 savox we ran for yrs ... Would have never guessed it
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Old 07-31-2016, 05:33 PM   #873
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Originally Posted by jlfx car audio View Post
Let me say this about servos ... Ran savox in all our cars for 2-3 yrs last season I built our new cars with futaba bls-551s and was blown away how much more connected we were to our cars .
Then as a experiment I added New airtronics servos(erb-871) to our usgt cars and being the only difference made we both were able to get better more consistent laps and switched to airtronics thru out all our cars and they are night and day better than a 1251 savox we ran for yrs ... Would have never guessed it
Which airtonics and Futaba part numbers specifically did you use?
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Old 07-31-2016, 05:34 PM   #874
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Originally Posted by jlfx car audio View Post
Let me say this about servos ... Ran savox in all our cars for 2-3 yrs last season I built our new cars with futaba bls-551s and was blown away how much more connected we were to our cars .
Then as a experiment I added New airtronics servos(erb-871) to our usgt cars and being the only difference made we both were able to get better more consistent laps and switched to airtronics thru out all our cars and they are night and day better than a 1251 savox we ran for yrs ... Would have never guessed it
Totally agree with this... used to run different brand servo's to the radio gear, but when I switched to Sanwa servo's to match the radio gear, and there was night and day difference!

Best bit of advice on servo's is simply to go with the brand that matches your radio gear... they are designed to work together! Can save a large number of headaches that you may never attribute to a servo.

On that point, the SDX-801 is still my preference for servo in TC, over the more expensive and faster SRG-BLS v2. It's the perfect speed and feel IMO, at almost 1/2 the price.
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Old 07-31-2016, 08:22 PM   #875
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The futaba was a BLS-551 but changed to the Sanwa ERB-871 in usgt(heavier servo 57g) and the
SRG-BLS servos in tc @47g.

Last edited by jlfx car audio; 07-31-2016 at 08:32 PM.
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Old 08-01-2016, 01:40 AM   #876
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The proamps servos i switched to gave similar improvments in feel and connectedness with my sanwa radio.
Inputs were much more precise and there is no wander on straight sections or the steering not returning quite to center.
I was thinking of getting sanwa srg but thought id try these out and im very happy with them.

I ran 1252mg in my touring car for a long time and i thought it was pretty good. Id definitely say good for the price, but the proamps arent much more expensive than a high end savox and seem to compare very nicely to high end futaba/sanwa
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Old 08-01-2016, 03:51 PM   #877
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Originally Posted by Slapjack View Post
Has anybody Used this Xpert servo? Trying to decide
Between this and he Savox 1251. The Xpert has better specs but just wondering if it is as good of a brand as Savox. I always use Savox in everything and just thinking about trying somethings different.
https://www.amainhobbies.com/xpert-3...i-3431/p276597
Some of the newest Xpert stuff is actually very very good. This is more of the budget servo from them, but it still is very good for the money.

I would however highly suggest looking at the PI-3402 instead. Much more modern encoders, gears, and motor.

https://www.amainhobbies.com/xpert-3...i-3402/p448663

I think you'll be happy with either one though .

-Korey
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Old 08-02-2016, 02:21 PM   #878
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Originally Posted by R Dodge View Post
Wikipost updated to include build tips and tricks provided by Tim Wahl. Very useful info in there for any TC build.
NICE! Thanks.

The steering section was very helpful. What shims are people using to shim the steering (as in Tim's post from the wiki)? I have a bunch of shims but don't have the right sizes.
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Old 08-02-2016, 03:14 PM   #879
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NICE! Thanks.

The steering section was very helpful. What shims are people using to shim the steering (as in Tim's post from the wiki)? I have a bunch of shims but don't have the right sizes.
I think kyosho and/or tamiya have shims like that. I have some that are really old and can't remember for sure what brand they are. You might also find that clutch shims may work.
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Old 08-03-2016, 05:28 AM   #880
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Quote:
Originally Posted by Korey Harbke View Post
Some of the newest Xpert stuff is actually very very good. This is more of the budget servo from them, but it still is very good for the money.

I would however highly suggest looking at the PI-3402 instead. Much more modern encoders, gears, and motor.

https://www.amainhobbies.com/xpert-3...i-3402/p448663

I think you'll be happy with either one though .

-Korey
Agree with Korey, I'm really happy with the xpert servo, cheaper than the sanwa but excellent in terms of response rate and durability. Using the PI-3431
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Old 08-04-2016, 09:19 PM   #881
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CRC black carpet setup question:
I am working on an initial setup for carpet, and I was wondering if anyone uses the outside attachment point on the arms for the rear roll bars? In the manual it says that it is good for high traction. Is this a good starting point for carpet?
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Old 08-04-2016, 11:39 PM   #882
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CRC black carpet setup question:
I am working on an initial setup for carpet, and I was wondering if anyone uses the outside attachment point on the arms for the rear roll bars? In the manual it says that it is good for high traction. Is this a good starting point for carpet?
That link point works almost like standing up the rear shock, it will keep the rear of the car flatter and will generate a little more side bite. Its not as big of a change as moving the shock though. It's good to try if you're lacking stability but I don't think you'll need that for the new carpet.

I didn't test this on the new carpet, but I've played with it on a track that had very high traction gray carpet.
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Old 08-05-2016, 08:12 AM   #883
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That link point works almost like standing up the rear shock, it will keep the rear of the car flatter and will generate a little more side bite. Its not as big of a change as moving the shock though. It's good to try if you're lacking stability but I don't think you'll need that for the new carpet.

I didn't test this on the new carpet, but I've played with it on a track that had very high traction gray carpet.
Thank you. I will go with the middle point and test later if I need.
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Old 08-05-2016, 07:20 PM   #884
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Agree with Korey, I'm really happy with the xpert servo, cheaper than the sanwa but excellent in terms of response rate and durability. Using the PI-3431
Same here. I have three xpert 3402 servos. One in my T4, one in my XB4 and a spare.

The spare is still in the shrink wrap after 12months almost - so that's a good sign.
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Old 08-07-2016, 12:19 AM   #885
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What position are ppl running the front and rear diff in for carpet tracks? By position I mean where the tab piece sits in he bulkhead notches. Also what diff fluid works well on carpet?
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