Recent content by SpikeG

I 3d printed the restrictor plate so the dimensions are within 0.05mm. Apologies in advance for the mixed units but the hole is exactly 0.999 inches ID (25.4mm). The plate itself is 20mm tall. The OD is 3" (76.2mm). Maybe the thickness of the restriction is contributing to the differences...

Hey Alex, first off, thanks for all the time and money you spend figuring out a combination that works well enough to let us start at this level. We ran those tests pretty late on Friday night and left before we could really figure out the hobbywing app. I had assumed the data logs would be...

Thanks for the info! I agree, sticking with the direct OBD plug in seems like the way to go forward. I'll probably buy another cable soon to cannibalize and tap off the 12v line with a buck converter for the RPi's power source. We're going to be cutting it close on time as we present one month...

Some of this will be specific to our build but since I've been in and out of this thing so much I decided to catalog the fasteners used for quick reference Part Pitch Length Head Material Washer Quantity Tool Backplate to Compressor M6x1 15mm Socket Stainless Split Locking 4 5mm Allen...

Initial spin tests went well. We ordered some nicer hardware to make it look more professional as well. Next step is measuring full load current draw, pressure output with various restrictor plates, impeller speed, motor speed. We have a clamp to mount the setup to the test bench, fireproof bags...

I posted this in the P2 thread but I'll put it here for continuity. When we went to do our initial spinup test, the impeller of the supercharger started to foul on the compressor housing. Turns out, the chinese clones aren't 100% on the QC but no worries. If you have this issue and don't want to...

Since we're using pressure as a control variable we had to find a sensor that would work for our needs. We went with a honeywell I2C sensor thats capable of 0-15 P.S.I. The RPi had to be configured to communicate via I2C in a startup config file. We tested the sensor via a python script and have...

In the mean time we have been working on the OBD data to the RPi, and the PWM output as well. The RPi has two modes for PWM output, software based, and hardware based. The ESC uses a standardized servo protocol of 50Hz where a 1ms pulse (5% duty cycle) is 'zero speed' and a 2ms (10% duty cycle)...

Our final design was much thicker than the printed versions for rigidity. We added a tension set screw to allow repeatable belt tension and prevent it from loosening under vibrations. The set screw is probably not necessary but when its being machined at a steep discount, why not. Image Dump:

As soon as the parts came in we started designing and testing various motor mounts. After some calculations, we decided to go with a 245mm T5 belt from McMaster. Since we'll be testing this on a small engine (2.8 i4), we're not too concerned about hitting 5p.s.i. given the supercharger outlet...

Mid way into the project our build sheet added up quickly. We already had a LiPo charger, RPi's, some wires, misc hardware etc. We're using a Castle Sensored 2028 4 pole motor and HobbyWing MAX4 ESC. For batteries we are using 2, SMC HCL-HP 22.2V 9500mAh 150C, 6S batteries in series for 12S...

Figured it was about time to start our own thread. A group of 4 of us are working on an electric supercharger for a senior design/capstone project for EE/CPE undergrad. We're doing a P2 supercharger build based off all of AlexLTDLX's hard work as we only have 4 months to complete the project...

Went ahead and took it apart tonight. the teeth are machined directly into the impeller shaft, the runout bearing is pressed on tightly, and the spacer that sits on the inner race of the backplate bearing is loosely fit on the shaft. This was concerning before as it is not tight enough to remain...

Looks like I'm having the same problem. If I press on the nut holding the impeller, the impeller shaft will slide enough that the impeller drags on the backplate. If I press on the pulley to push it back the other way, the impeller will hit the compressor housing and drag. Looks like I'll be...

Just a heads up for anyone considering the HW Max4 It will NOT come with the sensor cable adapter. I purchased via hobbywing direct through Amazon and it came sealed in the box without the cable. I reached out to hobbywing and they were... less than helpful. They offered a coupon to their...