INSTRUCTION ADDENDUM -
TKR5400 – NT48 1/8th Scale Nitro 4WD Competition Truggy Kit
Tekno RC is making waves in the 1/8th nitro scene. The NB48 has caught a lot of people off guard and we’re ready to follow it up with the all new NT48 1/8th Scale Nitro 4WD Competition Truggy Kit.
So now we are very excited to introduce the NT48, a completely new 1/8th Nitro Truggy. Built on the hot-selling EB48 and SCT410 platform, it shares many parts already available around the world. But the real fun begins when you start to notice the details and optimizations we put into the vehicle. Like its electric counterpart, the ET48, this is not a conversion – it’s a ground up nitro truggy design.
Most of the current truggies on the market have flip-floppy arms and inadequate shock absorbers coupled to undersized shock towers. We set out to change all that with a set of truggy arms that are stiffer and beefier than any others. This makes the suspension much more efficient and results in higher corner speed and a noticeable increase in overall steering and response. Another obvious benefit is the ultimate durability of the arms. They are nearly indestructible.
A new set of rear shocks were needed to handle the rigors of truggy racing. Measuring in at 137mm long, they provide excellent bump handling and jump landing. Our current 122mm shocks, standard on the rear of our EB48/NB48/SCT410, are now outfitted to the front of this awesome truggy. CNC machined 8 x 1.3mm pistons are standard, giving you an excellent blend of low speed and high speed damping. New, truggy specific springs and sway bars finish off the damping package.
The last piece of the truggy puzzle were the shock towers. Truggies need more suspension travel than buggies, both up and down. To ensure that any racer could tune in their suspension to any track condition, we supplied the ET48 with more droop than any other truggy. At the same time, there is an abundance of up-travel to make sure the shocks don’t bottom before the chassis does on hard landings or super rough conditions. The front tower stands tall and is a whopping 6mm thick full CNC 7075 gun metal anodized aluminum masterpiece. The rear is 5mm thick and equally impressive. Let’s face it, truggies drive hard and this truggy will stand up to the abuse.
The NT48 builds on the success of the NB48. After computer analysis of dozens of different layouts it became clear that a lot of the current vehicles on the market are not optimized. Some are too heavy on the right side (rear diff output is offset too far). Others are more balanced but the engine and weight distribution aren’t as centralized (rear diff output is not offset enough), producing slower steering response in ‘U’ and ‘S’ sections.
We achieved ideal side-to-side weight by creating an all new mid-offset rear bulkhead and ring gear. It moves the engine closer to the center without overloading the right side. It also minimizes drive angles and wear on the center dog bones. The drivetrain is as free as can be without sacrificing chassis layout and weight balance on the very narrow 4mm 7075 CNC hard anodized aluminum chassis.
The next question was, “do we put the weight forward or back?” How about both? The engine can be mounted in two positions, a front position and an 18mm offset rear position. Under most conditions, the motor forward produces the fastest cornering and subsequent lap times. In very bumpy or very loose conditions testing shows the rear engine position can be easier to drive although not as fast.
The last challenge with weight distribution is how low you can place it. Following a design cue from the EB48 and ET48, we created the radio tray and the right mudguard as one piece. This allowed the RX battery to essentially sit on the chassis producing the lowest CG possible. The RX sits right behind the battery and the throttle servo is mounted behind the RX. Wiring is clean and easy with almost no exposed wires. Finishing off the radio tray are integrated transponder, switch, and antenna mounts. The entire radio tray/mud guard can be removed with only 6 screws making cleaning your new nitro ride an easy task.
The throttle and brake linkage setups were approached with precision and consistency in mind. The throttle is pulled by a CNC machined assembly riding on ball bearings. Yes, it costs more to produce, but we thought a system so critical to the performance of a nitro vehicle should be perfect.
The brakes were designed to be simple and effective. They are side-mounted on the center differential assembly and brake bias adjustments are a simple turn of the connecting turnbuckle. After testing various disc and brake pad material combinations, it was abundantly clear that a steel disc with semi-metallic brake pads is the best setup. Again, it costs more to produce, but how lame are brakes that are inconsistent and fade on the 3rd lap of your main event?
A new 4 shoe clutch and clutch bell transmit power smoothly and efficiently. Access to the clutch shoes and springs are simple with no special tools required other than a hex driver. Large diameter inner and outer bearings means more time in between rebuilds and less bearing failure. The clutch bells are also compatible with most other 4 shoe clutch systems.
The fuel tank is a typical clunk style tank, but with some additional features to keep things running well and running clean. Raised sides on the outside of the tank help keep fuel off the chassis. There is also an overflow fuel outlet that drains through the bottom of the chassis. We spent a lot of time choosing the right spring and seal for the tank. The result is a tank that runs virtually the same from fuel fill up to pit stop.
The steering and suspension are direct carryovers from the ET48. Bulletproof suspension arms, silky smooth 16mm bore shocks, precision steering, and a ton of adjustments will keep you headed in the right direction. The differentials are light and extremely durable. They will provide consistent leak-free performance tank after tank.
We also decided to include a host of performance parts that are usually options on most other cars. These include lightened aluminum pivot balls, steering posts, lightened gears and outdrives throughout, and CNC tapered pistons. Dry weight is roughly 4040 grams depending on equipment installed. A new style nitro specific truggy body was designed to hug the mud guards and protect from mud and dirt.
When you back all of this up with Tekno RC’s unparalleled customer service and community interaction, you have yourself one of the most competitive and innovative truggies available. The NT48 should be available in early 2014 and will be competitively priced with other top quality truggies on the market.
Optimized Narrow Chassis Layout with Adjustable Weight Distribution and Flex Characteristics
Engine Can be Mounted in Forward or Rearward Position (18mm offset)
4mm CNC Machined Hard Anodized Lightened 7075 Aluminum Chassis
Integrated Radio Tray/Mud Guard for Unmatched COG, Lightness, and Durability
Class leading front and rear clearance (short chassis overhang) provides better bump handling and jump landing
Spacious, enclosed, easy access radio box with integrated transponder mount
Adjustable chassis brace system for fine tuning flex with center, and rear braces
Differentials and Drivetrain:
Straight Cut CNC machined hardened steel ring and pinion gears
Innovative Rear Offset Differential Provides Minimal Drive Angles and Reduced Wear
Lightened Drivetrain Components Throughout – Standard
3 Fluid Filled Adjustable Lightweight Differentials
Less Rotating Mass = Better Acceleration
CV Driveshafts with Captured Pins on all 4 Wheels
16mm Bore CNC Machined Hard Anodized Threaded Aluminum Shock Bodies
CNC Aluminum Shock Caps, Preload Adjusters, and Cartridge Caps
CNC Machined 8 x 1.3mm Tapered Pistons
6mm front, 5mm rear CNC Machined 7075 Aluminum Shock Towers
Fully Adjustable Long Travel Suspension Geometry Maximizes Stability and Traction While Providing Superior Cornering and On-Power Steering
4mm Hardened Steel Polished Shock Shafts
Triple Guide Design for reduced Shaft Deflection
Optional spring rates and spring kits are available
Suspension and Steering:
7075 Aluminum Adjustable Hinge Pin Braces
Adjustable length rear arms to suit any track condition
Adjustable front arm sweep and angle to make the car more aggressive (swept back), or easier to drive (swept forward)
Front and rear arms can be used on either side, rear hubs can be used on either side – less parts in your toolbox
‘Narrow pivot’ steering posts provide ‘0 bump’ geometry without almost 0 steering slop
4mm inner, 3.5mm outer hinge pins, polished for smooth action
Adjustable Ackerman and bump-steer (bump in, 0 bump, bump out)
Ball Bearing Steering System Virtually Eliminates Slop
LCG rod ends and lightweight turnbuckles are lowered by 5mm
Adjustable steering stops for precise steering travel setting
Brakes, Clutch, Fuel Tank:
Steel Disc Brakes with Semi-Metallic Brake Pads are Consistent and Fade-Free
Ball Bearing Throttle Linkage Assembly for Smooth and Quick Operation
“Clunk” Style Fuel Tank with Integrated Spill Guard and Outlet
Adjustable 4-Shoe Clutch System (Compatible with Standard 4-Shoe Clutches)
Lightened Pivot Balls, Steering Posts, and Wheel Hubs – Standard
Lightweight easily adjustable wing mount system
High downforce wing included
Easily adjust anti-squat, rear toe, front arm angle, front arm sweep, roll center, toe, camber, wheelbase, rear arm length, Ackerman, bump steer, suspension geometry out of the box
Shares Many Parts with Our Acclaimed EB48, NB48, ET48, and SCT410 = Less Spare Parts in Your Box
All metric hex hardware
Dry Weight: 4040g* (9.1lb) (*your weight may vary depending on equipment used)
Diff Ratio: F/R – 9/40t, Center – 48t
Clutch: 4-shoe adjustable with 7075 aluminum shoes
Clutch Bell: 13t w/ 5x13x4mm inner, 5x10x4mm outer bearing
Brakes: Steel discs with semi-metallic pads, side mounted
Fuel Tank: 150cc, clunk
Needed to complete:
2/3 channel radio/transmitter
.21-.28 cu/in nitro engine and pipe
High torque/speed steering and throttle servos
Hump style RX battery pack
Fuel and fuel bottle
Starter box and glow ignitor
1/8th scale buggy tires, inserts, wheels & CA glue
Paint for body
Hex tools (1.5, 2.0, 2.5mm), pliers, other tools
4mm and 5mm turnbuckle wrenches
I also found this chart comparing Losi 8ight and Hot Bodies D8 springs, both of which fit Tekno shocks (THIS IS THE BUGGY CHART).
ANOTHER BUGGY CHART
Originally Posted by SMR 510RR
Alright guys, I got tired of referring to 3 different spring charts to compare different brands so I compiled all of them and sorted them by spring rate. Please feel free to pass this along.
It will also print nicely on a 8.5x11 piece of paper to keep in your track bag for quick reference while at the track. Also, if anyone wants any other springs added (I think I got most of the popular ones) please let me know and if you find any errors please let me know.
The kit comes with XXXcSt front and XXXcSt rear shock oils. This translates (roughly) to Losi XX and Associated XX for the front, Losi XX and Associated XX for the rear. If you're switching to any other companies oils, starting within 5 wt (or 50cSt) of those should be fine for your first runs. Use that as a starting point and tune from there.
INNER HINGE PIN ADJUSTMENTS
The EB48 has adjustable hinge pin holders that allow users to fine tune their truck for different tracks, conditions, or driving styles.
The front outer adjusts the amount of front arm "sweep" in 0.5 degree increments from 1 degree forward to 1 degree back.
The front inner adjusts the amount of arm kick-up in 0.5 degree increments from 10 degrees up to 12 degrees. This in turn also adjusts your total caster angle from 25-27 degrees.
Looking at the picture, the top option is 10 and 25 degrees (kick-up and total caster) and the bottom is 12 and 27 degrees.
The rear outer adjusts your toe angle in 0.5 degree increments from 3.0 degrees up to 5.0 degrees using the +1.5 holder (standard on the NB48)
The rear inner adjust anti squat angle in 0.5 degree increments from 1 degree up to 3 degrees.
The purpose of sweeping the arm forward or backward is mostly to sweep the driveshafts forward or backward. When the driveshafts are angled it changes how the car reacts on and off power. (This goes for the rear driveshafts as well.)
When the driveshafts are swept forwards, the stub axles are being twisted down toward the ground, pushing down on the tires and lifting the front of the chassis. This can be helpful in really bumpy sections to keep the front up and not dig in. It will also create more weight transfer to the front during braking which will increase your off-power steering.
When the driveshafts are swept backwards, the stub axles are now being twisted up, lifting the tires and pushing the chassis down. We've found that the biggest benefit to sweeping the arms back is jump landing. With the arms back, the car kind of "sucks" itself to the ground. It settles much faster and allows you to get on the throttle immediately. During breaking and off throttle the chassis will stay a little flatter front to back and either feel "pushy" or more controlled into the corner.
You can adjust the rear sweep by changing the wheelbase.
It's possible to have toe in on the rear and have the axles swept backwards (not on our car, I'm just making a generalization), but it doesn't handle well. It will squat really hard on acceleration and the nose will dip under braking. If any of you have ever driven a Revo with the long wheelbase rear arms you know what I'm talking about
APE-RC makes a stainless steel skid-plate. Here's a link
to his online store.
T-Bone Racing makes several bumpers/skids in different sizes for the front and rear of the buggy.
Here's a link
to the online store
DE-Racing's rear skid plate
LEADFINGER Racing's rear stainless steel skid plate
LIST OF COMPATIBLE ALUMINUM SERVO HORNS:
OTHER STEERING UPGRADES
APE-RC makes a stainless steel ackermann plate.
It's available here.
Tekno makes an aluminum ackermann plate.
Available direct, your LHS, or your favorite online store.
APE-RC has a great shock tool set that can be purchased here.
CAMBER LINK INFO
The camber links need a 4mm turnbuckle wrench for adjustment. We've found that some wrenches work exceptionally well.-
-The Losi stamped steel wrench (the one included with the 22 series of vehicles)
-The Hudy wrench