P2 Supercharger Thread

Well I went a head and purchased a P2, it will take about a week or so to get to NZ. Then I need to move on to thinking about powering it :D
 
boe said:
Excited for you rbb. How/where are you sourcing your drive pulley?
Click to expand...
You ask tricky questions :)

My next step is learn all I can about batteries and motors. I have been unable to get a response from the manufacturer regarding a compressor map so my default gearing/pully sizes is going to be a guess followed by some trial and error. Also I am not liking how only half the mounting points are used to hold the compressor onto the backing plate. So I think I'll drill some holes and add 4 more bolts to it.

Then finding a location for it in the engine bay will be a fun curse filled day I imagine :ROFLMAO:
 
I did some digging, and asked a couple of AI bots, chatgpt and googles gemini, they seem to agree that turning the compressor at 35,000rpm, a PR of 1.5, 65% efficiency and 65ish pounds of air will take 37 to 40 kilowatt's of power (50+ hp)

Does that sound right to you guys?
 
I put some info into Matchbot and tried to find a similar compressor map and it gives shaft HP as an output.

Matchbot - BorgWarner

www.borgwarner.com www.borgwarner.com
No idea how that translates to our application but I fugured its a reasonable start. i think i was looking at <20HP for a pressure ratio of 1.2 so not far off your numbers.
 
yea, so I am thinking a dual motor setup to drive the compressor, high rpm and stepping it down through the belt drive. Maybe have the motors drive a shaft that is 1:1 with the compressor and drives the belt, gear the motors to the shaft, flip the motors 180 deg to the other and have each motor drive a different end of the shaft to try and reduce the package size
 
NickM said:
I put some info into Matchbot and tried to find a similar compressor map and it gives shaft HP as an output.

Matchbot - BorgWarner

www.borgwarner.com www.borgwarner.com
No idea how that translates to our application but I fugured its a reasonable start. i think i was looking at <20HP for a pressure ratio of 1.2 so not far off your numbers.
Click to expand...
Look at the map, locate the value on the left and determine the units. If it is in meters per second (m/s) you can use the following calculator to convert that in to rpm. I've been using this bot for years, initially for traditionally boosted applications but now for trying to identify the best size turbo compressor assembly to suit the range of performance I want for an electric turbo.

M/S To Rpm Calculator - Calculator Academy

M/S to RPM Calculator Basic Calculator Advanced Calculator Enter any 2 values to calculate the missing variable Linear Speed (m/s) Diameter (meters) RPM
calculator.academy calculator.academy


BW MAP.jpg
 
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