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R/C Tech Forums Thread Wiki: Xray T4 18
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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 high traction**
XRA301147 T4'18 ALU FLEX CHASSIS 2.0MM - SWISS 7075 T6 **For very high traction**
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

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Old 09-13-2017, 02:04 AM   #31
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I was hoping to see a 36 tooth diff pulley (at least) so we can return to planetary-sized pinions, but it may be that Xray is thinking more about mod drivers.
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Old 09-13-2017, 06:00 AM   #32
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Originally Posted by NEED-MORE-SPEED View Post
I noticed in the picture the 4 lay shaft screws are no longer an option to stiffen the chassis on the top deck. The 4 lay shaft screw holes are no longer
The rear two layshaft screws are fitted in the pic with Bruno, no holes at the front of the layshaft though.
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Old 09-13-2017, 06:44 AM   #33
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Originally Posted by Skiddins View Post
The rear two layshaft screws are fitted in the pic with Bruno, no holes at the front of the layshaft though.
Really hard to tell from the photo, maybe they have got rid of those two like you say
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Old 09-13-2017, 11:17 AM   #34
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T4: 2018 new parts.
-----------
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)

301146 T4'18 ALU CHASSIS 2.0MM - SWISS 7075 T6
Aluminum T4'18 chassis designed for increased traction, stability, and steering. The alu chassis gives better control and makes the car easier to drive. Extensively tested and recommended for medium, and high-traction tracks, this narrow chassis is CNC-machined from 2mm premium Swiss 7075 T6 and is additionally black coated.

301147 T4'18 ALU FLEX CHASSIS 2.0MM - SWISS 7075 T6
Aluminum chassis with special cutout openings for increased flex. This chassis is recommended for and works extremely well on low-to-medium traction tracks. (Not recommended for very high traction conditions where the #301146 - Alu Chassis works better.) This alu flex chassis generates more traction and makes the car faster and easier to drive. Successfully raced by the factory team, this is a "must have" for every serious racer.

301169 T4'18 UPPER DECK 1.6MM GRAPHITE
High-quality CNC-machined top deck made from 1.6mm premium graphite material. The shape of the rear portion of the top deck has been specifically designed to achieve maximum traction and in-corner steering and the shape allows for easy access to the pinion. The 1.6mm top deck is thinner than the standard kit top deck which increases flex and generates more traction. Suggested to use especially with the combination of aluminum chassis, both stiff and flex ones.

302063 T4 ALU ADJUSTMENT BALL-BEARING HUB (2)
These beautiful 7075 T6 aluminum adjustable ball-bearing hubs are direct replacement of the standard composite ones included in the kit. The aluminum hubs are super lightweight wtih 3.5g less weight than the composite ones, saving in total 14g. The aluminum hubs reduce the friction and make the car to run more free with increased the drivetrain efficiency. Suggested especially for stock class where super low friction drive train is important. The aluminum hubs are stronger and more reliable with increased life span. Color coated in XRAY distinctive orange color. Set of 2.

302712-O ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - FRONT - FF-LOW
302722-O ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - REAR - FR-LOW
Authentic XRAY alu front lower suspension holders for the front bulkhead on the T4'18. The lower design of the suspension holders helps to generate more steering and forward traction. Suggested to use especially for asphalt tracks with low to medium traction.

The suspension holders are designed to fit composite eccentric bushings 362315 to increase geometry adjustment range. The suspension holders allow more durable mounting of the suspension arms and the geometry of the car does not change even after hard crashes. Thanks to the mounting system, arms move very freely which gives more traction and the car feels smoother in corners which positively influences steering characteristics. Suspension holders are CNC-machined from premium Swiss 7075 T6 aluminum and have been designed to provide the lightest and strongest possible support framework for the car.

303004 T4'18 BRASS MOTOR MOUNT PLATE
CNC-machined motor mount plate made from brass material replaces standard alu motor mount plate. The motor mount plate adds extra 4g of the weight into the absolute chassis center line that ensures a perfect side-to-side balance and eliminates any negative chassis flex. The plate features extra holes more to the back of the chassis for improved traction of the car.

305869 OFFSET SPUR GEAR 99T / 64
Addition to the range of precision-molded 64-pitch offset spur gears made from special hard composite material, strategically lightened to reduce rotating mass without compromising strength or durability.

306194 T4 GRAPHITE + BRASS FULLY ADJUSTABLE BATTERY HOLDER
Adjustable battery holder allows to move the batteries front and rear but also left to right for easy and comfortable weight transfer adjustment. The holder allows to move the battery which changes the Front/Rear weight balance by 4mm. The brass material adds extra 7.5g weight for tuning the side-to-side balance weight to the battery side for tuning side-to-side balance. Design of the battery holder eliminates any negative chassis flex.

306531 BRASS CHASSIS STIFFENER
CNC-machined chassis stiffener made from brass material replaces standard graphite chassis stiffener. The brass material adds extra 4.5g weight into the absolute chassis center and eliminates any negative chassis flex.

308029 ULP ALU PROGRESSIVE SHOCK SYSTEM - SET (2)
Innovative progressive shock system for new ULP touring car shocks for improved traction and steering characteristics. Shock insert has 3 triangle cuts and is used with piston without holes. The hardness of the shock is influenced not by the holes in the piston but with the insert. The insert is mounted into the shock with wider surface on the bottom of the shock and narrower on the top.
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Old 09-13-2017, 11:18 AM   #35
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Originally Posted by niznai View Post
I was hoping to see a 36 tooth diff pulley (at least) so we can return to planetary-sized pinions, but it may be that Xray is thinking more about mod drivers.
Same gear diff cases in T4 18 at the moment.
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Old 09-13-2017, 11:31 AM   #36
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Yeah, that's what I suspect, hence my slight disappointment. I guess it is easier to increase the size of the centre pulley than re-design an entire diff.
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Old 09-13-2017, 11:43 AM   #37
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Quote:
308334 ULP COMPOSITE SHOCK PARTS
308324 ULP ALU SHOCK BODY (2)
So the shocks will be lowered with a combination of shorter bodies and shorter plastics?

Last edited by syndr0me; 09-13-2017 at 11:54 AM.
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Old 09-13-2017, 11:44 AM   #38
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308043-O ULP ALU SHOCK ADJUSTABLE NUT - ORANGE (2)
308354-O ULP ALU SHOCK CAP-NUT WITH VENT HOLE - ORANGE (2)
Diameter of shocks has changed too?
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Old 09-13-2017, 11:49 AM   #39
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Just trying to read between the lines with the new parts, I have no actual info.
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Old 09-13-2017, 02:02 PM   #40
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Quote:
Originally Posted by Psycho_ View Post
T4: 2018 new parts.
-----------
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)

301146 T4'18 ALU CHASSIS 2.0MM - SWISS 7075 T6
Aluminum T4'18 chassis designed for increased traction, stability, and steering. The alu chassis gives better control and makes the car easier to drive. Extensively tested and recommended for medium, and high-traction tracks, this narrow chassis is CNC-machined from 2mm premium Swiss 7075 T6 and is additionally black coated.

301147 T4'18 ALU FLEX CHASSIS 2.0MM - SWISS 7075 T6
Aluminum chassis with special cutout openings for increased flex. This chassis is recommended for and works extremely well on low-to-medium traction tracks. (Not recommended for very high traction conditions where the #301146 - Alu Chassis works better.) This alu flex chassis generates more traction and makes the car faster and easier to drive. Successfully raced by the factory team, this is a "must have" for every serious racer.

301169 T4'18 UPPER DECK 1.6MM GRAPHITE
High-quality CNC-machined top deck made from 1.6mm premium graphite material. The shape of the rear portion of the top deck has been specifically designed to achieve maximum traction and in-corner steering and the shape allows for easy access to the pinion. The 1.6mm top deck is thinner than the standard kit top deck which increases flex and generates more traction. Suggested to use especially with the combination of aluminum chassis, both stiff and flex ones.

302063 T4 ALU ADJUSTMENT BALL-BEARING HUB (2)
These beautiful 7075 T6 aluminum adjustable ball-bearing hubs are direct replacement of the standard composite ones included in the kit. The aluminum hubs are super lightweight wtih 3.5g less weight than the composite ones, saving in total 14g. The aluminum hubs reduce the friction and make the car to run more free with increased the drivetrain efficiency. Suggested especially for stock class where super low friction drive train is important. The aluminum hubs are stronger and more reliable with increased life span. Color coated in XRAY distinctive orange color. Set of 2.

302712-O ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - FRONT - FF-LOW
302722-O ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - REAR - FR-LOW
Authentic XRAY alu front lower suspension holders for the front bulkhead on the T4'18. The lower design of the suspension holders helps to generate more steering and forward traction. Suggested to use especially for asphalt tracks with low to medium traction.

The suspension holders are designed to fit composite eccentric bushings 362315 to increase geometry adjustment range. The suspension holders allow more durable mounting of the suspension arms and the geometry of the car does not change even after hard crashes. Thanks to the mounting system, arms move very freely which gives more traction and the car feels smoother in corners which positively influences steering characteristics. Suspension holders are CNC-machined from premium Swiss 7075 T6 aluminum and have been designed to provide the lightest and strongest possible support framework for the car.

303004 T4'18 BRASS MOTOR MOUNT PLATE
CNC-machined motor mount plate made from brass material replaces standard alu motor mount plate. The motor mount plate adds extra 4g of the weight into the absolute chassis center line that ensures a perfect side-to-side balance and eliminates any negative chassis flex. The plate features extra holes more to the back of the chassis for improved traction of the car.

305869 OFFSET SPUR GEAR 99T / 64
Addition to the range of precision-molded 64-pitch offset spur gears made from special hard composite material, strategically lightened to reduce rotating mass without compromising strength or durability.

306194 T4 GRAPHITE + BRASS FULLY ADJUSTABLE BATTERY HOLDER
Adjustable battery holder allows to move the batteries front and rear but also left to right for easy and comfortable weight transfer adjustment. The holder allows to move the battery which changes the Front/Rear weight balance by 4mm. The brass material adds extra 7.5g weight for tuning the side-to-side balance weight to the battery side for tuning side-to-side balance. Design of the battery holder eliminates any negative chassis flex.

306531 BRASS CHASSIS STIFFENER
CNC-machined chassis stiffener made from brass material replaces standard graphite chassis stiffener. The brass material adds extra 4.5g weight into the absolute chassis center and eliminates any negative chassis flex.

308029 ULP ALU PROGRESSIVE SHOCK SYSTEM - SET (2)
Innovative progressive shock system for new ULP touring car shocks for improved traction and steering characteristics. Shock insert has 3 triangle cuts and is used with piston without holes. The hardness of the shock is influenced not by the holes in the piston but with the insert. The insert is mounted into the shock with wider surface on the bottom of the shock and narrower on the top.
How and where you getting this information from? Thanks
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Old 09-13-2017, 02:53 PM   #41
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Quote:
Originally Posted by NEED-MORE-SPEED View Post
How and where you getting this information from? Thanks
some of it is on Facebook - otherwise a lot of the European shops have details of the car and option parts
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Old 09-13-2017, 06:39 PM   #42
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Originally Posted by Bar View Post
Really hard to tell from the photo, maybe they have got rid of those two like you say
Not really hard to tell with a bit of zoom, can see the exposed front of the bearing...
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Old 09-13-2017, 06:40 PM   #43
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Originally Posted by syndr0me View Post
Diameter of shocks has changed too?
Shorter top cap
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Old 09-13-2017, 08:03 PM   #44
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Originally Posted by TryHard View Post
Shorter top cap
Wonder why the adjustment nut changed? Thinnner perhaps? Maybe with a position notch?
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Old 09-13-2017, 10:58 PM   #45
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Originally Posted by Psycho_ View Post
302712-O ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - FRONT - FF-LOW
302722-O ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - REAR - FR-LOW
Authentic XRAY alu front lower suspension holders for the front bulkhead on the T4'18. The lower design of the suspension holders helps to generate more steering and forward traction. Suggested to use especially for asphalt tracks with low to medium traction.

The suspension holders are designed to fit composite eccentric bushings 362315 to increase geometry adjustment range. The suspension holders allow more durable mounting of the suspension arms and the geometry of the car does not change even after hard crashes. Thanks to the mounting system, arms move very freely which gives more traction and the car feels smoother in corners which positively influences steering characteristics. Suspension holders are CNC-machined from premium Swiss 7075 T6 aluminum and have been designed to provide the lightest and strongest possible support framework for the car.
Have to say I'm intrigued with these.. as the attached picture shows something I did back in Feb to widen the tuning window...
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Xray T4 18-machined-blocks.jpeg  
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