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It is an interesting process to think through which compressor housing to use. Although using the same compressor maps, I am sizing quite different than a turbine powered turbo. I have found that the smaller diameter compressors for typical 4 cylinder engines require such high RPM > 100K, to get...

Good research on the motors. I like the find with the carbon fiber sheath for extra high RPMs. That motor is big bucks, but it looks like just what we need.

Thanks WB. Was your TP 4070 sensored? My hunch is that it is not, else probably would have been advertised as such. I just can’t seem to get a good picture to see if it has the sensor port or find any info on their website.

So, I really want to close the loop and get my motor ordered to free my mind and get it on its way. I am down to 2 lead options. A) castle 1721 and B ) TP 2070-CM. I like the high RPM limit (90K) and power handling of the castle, and clearly a sensored motor. Although after talking to their...

Similar to the motor summary, I am seeking a short list of ESCs to consider that are in the <$500 realm given the experiencial knowledge and collective wisdom of the forum. What other specific models should be on the list? What should be crossed off this list? Are there other considerations...

Thanks for the input. Here is an updated chart of motor options. Adding the LMT and Castle 1721. Motor RPM max Max Volts Watts Cont / Peak Cost TP 4070-CM 75K 12S = 48V - 54V 5,000 / 9,000 $189+ship TP 5670-CM 85K 10S = 40V 8,000 / 12,000 $399 Castle 2028-1700KV 60K 8S is this an...

thank you for the update WB. I was going to order a 4070 CM today, but curious if I should hold off for a better option. Could you share your thinking on why you are moving away from the TP 4070? Any watch outs? I have a similar sized engine to yours (2.0 liter 4 cylinder and am angling for a...

Got it, I like the approach. At first I thought it was sort of a coupler that connected the sawed off compressed shaft and the motor. From what I understand now, you actually made a new shaft threads and all. I did not know for sure that interference shafts are heated up, just guessing because...

Pretty cool. I am going down a similar path. Did you just cut off the original turbo shaft? I just took my turbo about last night to get the isolated compressor housing and shaft. It looks like the shaft is about 0.25'. How did you attach the motor extension shaft? Did you heat it up and then...

What is the most recent / consolidated thinking of motors to consider for direct drive of a small centrifugal compressor for a 2L engine? I am thinking the requirements are: High RPM 50,000+ High power (high volts, high watts) Large shaft ~ 8 mm Have we landed on sensored vs sensorless...

Any updates? I have a similar displacement engine 2.0 liter 1971 Opel GT. I am exploring options for an e-turbo now that I have a modern fuel injection system with stand alone Terminator X ECU. I am just exploring compressor options, motor options and ESC options. I was hoping to use my 56 volt...