HPI Blitz Project
Since its initial release, the HPI Blitz has become one of the most favorite short course trucks on the market. In our review (Read review) of the Blitz published few months ago, we have discovered that the HPI Blitz was packed of nice features and was at home on a race track as well as in a backyard.
With that said, I have contacted HPI Racing for this project and they have accepted to provide me few hopups parts to increase the Blitz’s performances and durability. My request to HPI was quite short and simple since I consider the HPI Blitz to be one of the most durable SC truck out of the box. I limited my parts request to HPI and I only upgraded what I thought may need a little help to transform my stock Read-To-Run Blitz into a perfect high performance and durable “sleeper” truck.
The easiest way to boost speed and accelerations was to install a hot brushless motor/ESC combo. Out of the box, the Blitz’s transmission is ready to handle all the power of any high performance motors on the market. The HPI Flux brushless system was the perfect choice for my project. With a 5700kv Warp brushless motor, I was sure they will dramatically increase accelerations and top speed.
The bullet connectors make installation really easy and quick. No soldering was required, I can’t be any happier! Once installed, a quick setup procedure was necessary to program the ESC full throttle, neutral and reverse positions. It took me less than a minute to set up the whole thing. The ESC supports LiPo and has a low voltage cutoff. Reverse can be disabled and it comes with Deans connectors already installed.
The drive train:
With a full metal geared transmission, the Blitz is bulletproof. The only upgrade I made in the drive train department was to swap the stock dog bones for smoother steel universal drive shafts from HPI. The installation is simple, remove the rear wheels and the dog bones and install the new universal drive shafts. Twenty minutes is enough to install both universal drive shafts. Clear instructions are included for assembling the drive shafts and no special tools were required.
Like for most RTR vehicles, the stock steering servo is correct for bashing but with all the power and speed I have “injected” in my Blitz, I needed a faster and stronger steering servo. Maybe you ignore it but HPI Racing has a line a high quality servos. I picked a SF-32TT Digital High Torque with titanium gears servo. Installation was simple, few screws to remove the stock servo, few minutes later and the new and stronger servo was already installed. Before connecting the horn to the servo, take few seconds to set your radio’s steering adjustments to neutral position and turn on the radio and receiver to make sure the servo is perfectly centered before installing the servo.
Stiffen the front end:
No matter which brand you drive, you know that 1/10th scale vehicles are prone to break when they hit something with their front wheels. Usually the front bulkhead breaks. Even if HPI Racing uses an excellent flexible mix of plastic and nylon in the building of their parts, I decided to go with a “peace of mind” solution. I’ve picked the HPI aluminum front suspension arm mount and brace and I’ve replaced the stock hinge pins with titanium nitride ones for more strength and smoother operation.
Surprise! For my projects, I usually select tires from specialized tires companies. But after looking at HPI’s website, I picked the ATTK tires in soft compound. Since I wanted to keep the look of my Blitz as stock as possible, I opted for the stock MK-10 wheels to mount the tires. Mounting the tires was also easy. A special note for one of the Blitz’s nicest feature goes to the possibility to switch the front and the rear wheels because they both use 12mm hexs.
The ATTK tires are directional, you can flip them for more or less traction depending on the surface you are running them.
Oh YEAH!!! Once my “sleeper” Blitz was completed, I was eager to drive it. With a fully charged 2S 5000mAh LiPo pack, I headed outside. I did a last checkup to make sure my radio trims were okay and to make sure everything was operating correctly.
Like a kid, I put the Blitz on the ground and I nailed the throttle. With a long roaster tail and a straight and fast acceleration, my Blitz was flying across my backyard. With the stock gearing, I estimate the accelerations to be three times faster than before and the top speed to be nears the 40MpH mark. That’s impressive.
The Blitz’s stock tires are good tires but the ATTK tires are better. They literally made a huge difference.
After many packs of hard bashing, the motor/ESC combo have never overheated. Their temperature has always been in the safe zone. Few passes in the street revealed me all the power of the Flux brushless system. The Blitz popped wheelies and the tires were screaming on hard stand and still accelerations. A quick adjustment to the slipper clutch was required to make the Blitz easier to control on slippery surfaces.
The new servo increased the steering response and let me drive the Blitz more aggressively. The new universal drive shafts are very smooth and they didn’t show any signs of wear or weakness.
As mentioned earlier, the aluminum suspension arm mount and brace have added peace of mind. Unfortunately, I didn’t have the chance to crash my Blitz hard enough to test the durability of my new aluminum parts and hinge pins. This was not the goal of this project anyway!!!
Parts used for this project:
- 1151 Flux brushless system
- 86831 Aluminum front suspension arm
- 86832 Aluminum front arm brace
- 86845 Titatnuin nitride suspension shaft 3x32mm (2pcs)
- 103165 Universal drive shaft (BLITZ/2pcs)
- 2x 103806 ATTK Tire S compound (2pcs)
- 2x 103331 MK.10 Wheel matte chrome (4.5mm offset/2pcs)
- 102490 SF-32TT Digital high torque servo
Do I love my new Blitz? YES I DO! The Flux brushless system has transformed my Blitz into a faster and funnier truck to drive on and off the track. I have limited my project to only few parts. Take the time to visit HPI’s website. You’ll be surprised by all the hopup parts you’ll find for your Blitz.
For more information, visit www.hpiracing.com