Spec Class Overkill – Building Yokomo’s BD10 for USGT Racing

Spec Class Overkill – Building Yokomo’s BD10 for USGT Racing

All of us love a little bit of on-road racing in our RC lives. I imply for me, it comes right down to having a love for all issues automotive, which is a part of what drew my consideration to RC within the first place. A kind of real-world inspirations is high-performance GT touring vehicles. There’s simply one thing to be appreciated about an attractive automobile that’s been constructed for efficiency racing. Fortunately, there’s an RC analog that appears identical to the actual factor; the long-established USGT spec class.

For those who aren’t acquainted, USGT is a 1/10 electrical touring automobile class that emulates actual world GT racing in scale format. All vehicles should be 1/10 scale 4WD touring kits, and should use a practical fashion GT physique, spec tires, a 21.5T USGT spec motor, a ROAR-approved ESC, and a ROAR-approved 2S LiPo battery. Apart from these few most important necessities, there’s a complete listing of how you can also make the automobile your personal, from the bottom automobile package option to the physique used, particular person digital part decisions, and even a wide selection of spec wheel kinds to select from. As soon as I noticed this class in motion a number of years again, I had a plan to get into the motion myself at some point. And at last, that day has come.

Constructed to Final, Designed for Efficiency

First choice for me to make was which package I’d base my construct on. Now, there are fairly a number of high-end touring automobile kits on the market, however to me I had my eyes set on one thing with a protracted racing pedigree together with nice elements help, and if doable, one thing that may be a bit overkill for spec racing. This purpose meant I wanted one thing with an industry-leading design, and world-class efficiency. So, after some thought I pulled the set off on one of many newest kits available on the market, the Yokomo BD10. Yokomo is well-known in RC for his or her top-notch manufacturing high quality and wonderful designs, and I can let you know that the BD10 doesn’t disappoint.

Initially when opening the field, I used to be greeted with baggage filled with precision molded elements timber molded from high-quality plastics, CNC machined aluminum bulkheads, and that stunning woven carbon fiber most important chassis, together with the carbon fiber shock towers. Instantly I used to be hit with that feeling of pleasure and appreciation that comes with shopping for a top-of-the-line package, able to be assembled. As might be anticipated from Yokomo, the match and end high quality is tough to beat. Each piece of the BD10 package shouldn’t be solely machined to actual tolerances however suits snugly in place with out want for any shaving, submitting, or different modifications. Precisely proper, proper from the beginning.

The BD10 is a severe racer, with tons of fine-tuning changes that may be made throughout the whole lot of the chassis. Completely different toe blocks, tablet inserts, tons of shock mount and camber hyperlink positions, a exact cam adjustment system to alter drive belt place and stress, and even a number of flex tuning factors on the middle bulkhead and high deck plate. The BD10 attracts inspiration from Yokomo’s earlier BD9 design, even utilizing a number of the identical small elements, like drive cups, together with a handful of possibility elements. Though comparable, the BD10 begins to interrupt away from the earlier BD9 design with probably the most notable change being the BD10’s mid-mounted motor middle bulkhead and isometric entrance and rear belts.

This main design change fully smooths out the driving traits of the automobile by inserting nearly all of the burden extra central to the chassis, successfully creating a greater driving automobile. The shocks on the BD10 have been completely redesigned by AXON, a heavyweight within the Japanese RC touring scene and embrace a brand new twin o-ring design, HVF inside coating for diminished inside friction, and new progressive fee springs. The BD10 additionally options 2mm longer suspension arms entrance and rear for stability and traction, and AXON anti-sway bars entrance and rear for improved dealing with. The BD10 ticks all of the bins within the on-paper efficiency division.

A KO Propo BSx3one-10 Grasper steering servo was chosen for its stability of precision, energy, and excessive velocity.

The bathtub chassis of the Fazer Mk2’s wheelbase is about half an inch longer than a typical commonplace touring automobile chassis. This helps give extra practical total proportions to the Elky.

The Gravity RC USGT spec 21.5T motor is powered by a Hobbywing XR10 Professional Inventory ESC, chosen for its wonderful BEC output and total efficiency.

Spec’d for USGT

With the BD10 being chosen as the bottom basis, it was time to decide on elements to make this USGT construct a actuality. USGT guidelines require using the Gravity RC 21.5T USGT spec brushless motor, together with Gravity RC’s USGT spec wheels and RIDE semi-slick tires, which retains the enjoying area pretty stage on two of the extra main part decisions. I opted to energy the 21.5 USGT motor with Hobbywing’s XR10 Professional Inventory Spec ESC, a ROAR-approved 80A brushless spec velocity controller with a high-output BEC for optimum efficiency.

To maintain the automobile on observe, I opted for the KO Propo BSx3-one10 Grasper steering servo, a high-performance brushless servo with a pleasant stability of velocity and torque. KO Propo’s 418KR receiver was chosen as a consequence of its compact dimension and additional response velocity when paired with the Grasper servo and was linked to my trusty KO Propo EX-II radio. Offering energy to those elements is an IP Mind 7200mAh 2S LiHV race pack.

Since I can’t actually ever go away something inventory, even when it’s a package pretty much as good because the BD10, I selected a number of extras to throw on for good measure. The primary possibility half that caught my eye was Yokomo’s Graphite Battery Holder. This set replaces the unique plastic elements with woven graphite elements, bettering the rigidity of the battery tie down. Yokomo’s titanium turnbuckles had been fitted rather than the inventory aluminum elements for a little bit of added energy.
Light-weight aluminum drive cups had been put in entrance and rear for drivetrain weight discount. A Hiro Seiko Light-weight Titanium screw package was combined in with the Yokomo screws to provide me simply that additional little bit of tunability when wanted. To high off the upgrades I opted to throw on a set of X-Sq. Kevlar low-friction belts to additional scale back drag on the driveline, plus they give the impression of being fairly dialed.

After selecting the most important elements of the automobile, together with some additional goodies, it was time to resolve on simply how I needed it to look. There are such a lot of sources of inspiration on the market on this planet of GT racing, so it took a while to residence in on simply what I needed. After some thought, and studying over the authorized physique listing a number of instances, I lastly selected the Bittydesign AGATA. This modern 190mm GT physique design seems to be to be impressed by a sure Italian automotive producer who competes in trendy GT racing. Painted up in a putting fluorescent yellow-green, this physique was good.

All within the Drive

Belt pushed vehicles have all the time had the good thing about feeling buttery easy, and the BD10 absolutely continues that custom. I don’t even suppose the phrase easy does it justice, it’s that good. First impressions of the BD10 motor format change are that it’s very predictable. Whereas testing I seen the burden switch could be very tight, and never unwieldy. The chassis simply sails by way of corners, with virtually no feeling of oversteer. Granted, with all of the doable tuning choices on the BD10 chassis, you may introduce oversteer or understeer as you see match however going by the very impartial instruction guide settings the chassis feels extraordinarily tame.

For anybody taking a look at utilizing the USGT spec RIDE semi-slick tires, it takes a number of laps to get them to stay on asphalt, however as soon as they put on in a bit, they do an incredible job of holding the automobile planted and on observe. The USGT spec 21.5T motor has an incredible powerband for a 21.5 motor, thanks partly to the Hobbywing XR10 Professional Inventory ESC, and a change in spur and pinion gears to get simply the correct gear ratio. When tuned to perfect settings, the Yokomo BD10 flies. Even with a 21.5T motor, the automobile feels quick, and that quick feeling is simply what I used to be in search of. One thing that is probably not a break-neck velocity like 5T modified automobile, however nonetheless has sufficient get-up-and-go energy to maintain me excited. The extra I drive this automobile, the larger my smile will get, figuring out full properly that it was cash properly spent.

and might deal with 2-3S LiPo or 6-8-cell NiMH packs. Ours was run totally on Kyosho’s personal 2200mAh 7.2V NiMH pack, however some additional efficiency might be had with larger cell counts.

The brand new BD10 design options isometric entrance rear belts. Gone are the times of getting to lug round 2 totally different sized belts for upkeep.

Last Ideas

I’d say when you’re seeking to construct a brand new touring automobile, then you may’t go improper with the Yokomo BD10. The massive listing of tuning choices, plus the high-end racing pedigree that Yokomo carry with their years of expertise actually exhibits within the high quality of the BD10 design. I do know for me personally, I’m more than happy with the driving really feel and efficiency of the automobile and might’t wait to hit the observe for some wheel-to-wheel USGT racing.

When you’re all in favour of a brand new touring automobile class to race, then give USGT a glance. The spec rule set combined with the massive quantity of chassis choices means you may construct your self a automobile that’s only for you, one thing you set coronary heart and soul into that makes you smile each time you’re taking it out to the observe. And it’s on the observe the place this BD10 construct will stay. I’m certain I’ll see a few of you on the market so till subsequent time, joyful racing!

The BD10’s shocks are newly design by AXON for optimized smoothness and consistency and are available outfitted from the manufacturing unit with newly designed progressive springs.


Extra About USGT
USGT is a well-liked touring class throughout the nation and has even seen rising reputation internationally. The core ethos of the category stems from having fun with extra practical wanting GT our bodies, whereas holding the racing comparatively accessible. Though my BD10 construct could also be within the larger realm of the value vary, entry into the category might be so simple as choosing up a used 4WD touring package, putting in the spec motor and tires and having fun with. When you’re all in favour of discovering a enjoyable, accessible type of 1/10 electrical touring racing, examine in together with your native observe to see in the event that they run a USGT class.


Textual content & Images by: Lauren Quick

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