Losi Baja Rey 4x4SCT Class Upsetter

Losi Baja Rey 4x4SCT Class Upsetter

Final Build Photos

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Submitted By
Chase Lyman
Haughton, LA, United States of America
Build Information
Readers Ride Title Losi Baja Rey 4x4SCT Class Upsetter
Vehicle Class Scale, Short Course Truck, Other
Vehicle Class Other 4×4 Solid Axle Trophy Truck
Chassis Brand Losi
Chassis Model Baja Rey
Body Brand Pro-Line
Body Model Ram 2500 SCT
Power System Electric
Electric Motor Brand and Model Tekin Pro4HD 3500kV
Speed Control Brand and Model Tekin RX8 Gen3
Battery Brand and Model Gens Ace 2S LiPo 6500mah 50C
Wheels and Tires Brand and Model AKA Cyclone wheels wrapped with AKA Impacts
Shocks Brand and Model Tekno NB48.4 shocks w/ VRP pistons
Axles Brand and Model SSD front diff housing and third member
MIP XDuty rear driveshaft
Paint Brand and Model Paint by KustomKoncepts
Radio System Brand and Model Spektrum DX5R
Other Options Brand and Model Exotek aluminum steering rack
GPM aluminum servo mount
Tekin T300 servo w/ Exotek aluminum servo horn
Losi carbon center brace
Hot Racing rear shock mounts
Hot Racing Axial Yeti trailing arms custom trimmed
Losi aluminum rear axle link mounts
3d Printed drop blocks for GPM upper chassis link mounts
GPM lower chassis link mounts
Further Description/Back Story This truck started off life as a lunch break parking lot basher. That life lasted all of a week. While visiting a King Cobra RC for a track day, they needed one more truck to make a race for the 4x4sct class. I entered the Baja Rey as a joke intending to stay out of the way and letting the guys run their race, but as fate would have it.. the Baja Rey won. After making a new friend in that class, it was determined that I wasn't allowed to upgrade to any other platform in that class until he could beat this truck. So over the course of a year, it has been getting continuous work done to be 4x4sct legal.

The big challenge was getting it past the main rule breaking hurdle, the long wheelbase. I had to shorten it quite a bit and I determined that using Axial Yeti length arms would get me close, and Hot Racing has a set of trailing arms that would allow me to trim the carbon fiber to get the length I needed. I used Lunsford titanium turnbuckles for the upper links and a MIP X Duty driveshaft of custom length thanks to ordering the driveshaft package through SuperShafty.

After chopping the rear cage section to match, it was time to work on the rear end geometry. I had some drop blocks for the rear axle upper link chassis mount made to drop the positioning of the front of the links 1/4" to get the suspension geometry more appropriate for track racing, giving me some anti squat instead of the stock pro squat. This helped the truck fly level and true while actually building some traction out back coming out of the corners, especially when the Tekin Pro4HD 3500kV motor starts to churn out the power to push this heavy truck.

To keep the 7+lb truck in check, the factory shocks had to go and Tekno NB48.4 shocks fit the bill. Using some VRP pistons and some internal shock limiting, they do a good job of getting through the toughest obstacles a track can throw at a truck. From divots and ruts, to triples and brake checks, the suspension has no problems keeping this truck pointed in the right direction and putting the power to the ground.

I also whipped up some carbon fiber plates to mount some Dubro body posts to put a sct legal body on top, because no one has time to remove the 24 screws to remove the body factory style. Using the more conventional and racer friendly 4 post setup, a Proline Ram 2500 SCT was sent out to KustomKoncepts to have a killer body on top in my racing colors so the competition knows exactly who just passed them.

This truck has been so much fun to build and race and odds are I'll keep racing with it because of the fun factor. Its fun to see the reactions of the turn marshals face when they notice that rear axle and when race directors make the same realization. To this day, the friend that started this whole situation still hasn't beaten this truck.

Build Process Photos

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