planning for my E-SC powered Nissan Fuga has begun

r.brown.bayliss

r.brown.bayliss

Member
I removed the front bumper and fender lining, and 3d scanned them.

The brown is the bumper cover, the messy bits are where the fog light normally goes and will be the main air intake with some cleaning up. Blue is the fender liner, the green panel is a cover the hangs of the chassis up top, and the front subframe at the bottom. Plenty of room to fab some bracket to hold everything in place.

All in all there is a triangle of floor space with 280mm sides and 500+ mm of height.

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I have 2 of them, so I need to design that, and will be gearing up. But it is an unknown. I have tried to get a compressor map from the P2 manufacturer but they have never responded to any communication.

With 48v the BLDCs can get to over 25k rpm, and if Alex is correct and it is basically the same as the Vortech SI I will be aiming for 33,000 impeller rpm. 24 or 26 teeth on the BLDcs should get me somewhere near there. If not I guess I will take up RC car racing as a hobby 🤣

Si_Compressor_MapSmall.jpg
 
r.brown.bayliss said:
I have 2 of them, so I need to design that, and will be gearing up. But it is an unknown. I have tried to get a compressor map from the P2 manufacturer but they have never responded to any communication.

With 48v the BLDCs can get to over 25k rpm, and if Alex is correct and it is basically the same as the Vortech SI I will be aiming for 33,000 impeller rpm. 24 or 26 teeth on the BLDcs should get me somewhere near there. If not I guess I will take up RC car racing as a hobby 🤣

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Is your assessment based on the exact same equipment, or specifications that he used in the example you are referencing? I've looked into this motor and can't get any definitive specs for it, except to assume the lowest performance ratings I've found are correct which is approximately 25K rpm. Meanwhile, the same motor series on Aliexpress carries believable specs at 500 kv and 72 volts for 9k continuous watts and 15k watts burst speed and 40k rpm max. That is much better suited for this application and direct drive. It is also near identical in performance to the TP 58 series motors except they have 50k rpm max and are even better suited for direct drive in this operating range.

Ideally a single motor is most efficient except for cost limitations where for example a single LMT motor with sufficient power is going to clobber anyone interested when it comes to the ESC side of the business. Two ESCs at around 250A and ~$200 ea, or one massive operating center supporting over 500A in the area $600+.

It's difficult but important to go slow unless you know everything you need to know. Two regrets I have at this point are having purchased a motor before doing all of the math (TP 4070CM 1400kv) and a 60v hybrid battery from a GM car. It's not a terrible start but months later after seeing, reading and estimating more, my first motor should have been a 58 series for less than a $100 more with a kv closer to a 200-250A max load range so that I could make much better use of hybrid battery options, like for example the extremely high amp-hr ratings of the Tesla 24v modules as well as several other 48v hybrid module options delivering high burst current loads in excess of what would be generated, at great prices. I'm planning a setup that can go a day or more without needing to be recharged.
 
I think that Alex used a different motor. I am just going with his assessment that the P2 compressor is a copy of the Vortech Si. The Ezrun 70125 motors are paired with the Ezrun Max4 ESC's. Hobbywing say 12s Lipo as max voltage, so 44v. I won't be directly driving the compressors, pulleys and belt drive to gear up and not push things to the limit. So looking at say 20k rpm from the motors and mid 30,000s rpm at the compressor. I chose the motors based on being available locally.

Yes, I expect to be making mistakes today that next year I will recognize as a mistake and hopefully appreciate the wisdom I have gained 😃

Next I need to find a local source of the pulleys, and I read here that some people have replaced the bearings in these P2 compressors, so I am looking into that as well.

I have space for a dedicated alternator for charging.
 
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