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All sounds sensible. I have fitted two of the fan assisted heat sinks with thermal paste and although my duty on the motor is low it maintains virtually ambient body temperature. The fans run all the time but I may mod the code with a timer post motor activation.

I cheated and borrowed a Mittotoyo digital bore mic for this sized hole

Your shaft will not be 8.000mm. You must measure it with enough accuracy. 0.01mm resolution is not good enough I think 24 mics is too much as you would have to heat it up to a really high temp and it would most likely cool down as you try and fit it on and stick (also probably overstress the...

You can buy them online but I actually borrowed one

NO NO NO

That sounds about right. I ended up drilling to 7.90mm and reaming 7.980mm. This gave me near as damit 10mics interference. Also ensure that there is a slight flat on the shaft so that the air can escape when shrinking it on.

I am using rc bearings although they are not rated for 100k as my duty cycle is low. The top bearing is Peek but is not a true bearing just a deflection limiter and most likely does very little. The OE spec of the motor bearings don't appear to be rated to 100k either

I know it is obvious but when making the shaft, take your time. Take small cuts to avoid distortion even with a live centre

You must bore/ream the hole first with a steady and then turn the shaft with the hole acting as a support during turning. The end cap of the motor is the same just a larger bore bearing and effectively nothing else. If the extra bearing in the backplate is not perfectly concentric then you are...

I thought you were using a shrink fit for the shaft. If not why not as it is the only sensible solution for an axial drive really. If you calculate the interference required it isn't much. It is easy to do if you are careful but you need the correct sized reamer if you don't bore it. Also how...

Run out is about 0.0004" which I think is good enough (obviously is). The end float control is just the same as the original motor i.e a bronze bush. It is just a different o/d and i/d with the correct thickness to get the end float. Also in detail there is a different sizes shim to prevent...

Now fitted and working as it should. Generates around 0.7bar boost before the turbo kicks in and pretty happy with the result. Absolutely no lag, instant response and still about 10krpm to go. I did fit a fan assisted heat sink (another on order) to keep the motor body temp under control as I...

I think you may need one of these https://www.amazon.co.uk/gp/product/B07H1S2PX8/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Final spec of motor has now passed bench tests and in the car awaiting mapping. The motor is a TP4070SCM 3930KV so capable of around 100krpm. Since the speed is so high I decided to modify the rotor and shrink the extension shaft onto it and use that as the top motor bearing surface (obviously a...

I am not sure of the current draw as my motor is sensorless but I did measure the the instantaneous current draw on one phase and with the small motor is was about 60A peak so very roughly 180A. I only used this very approx number (more as a comparator really) to calibrate the rate of start and...

In my case which is a twincharged application, the duty cycle is very low and the SOC of the 2 series AGM batteries are always close to 100%. This is why I chose them. They were also easy to maintain and charge. I could be wrong of course but for me they seem work fine.

Yes here is a shot of the system. This one has a BOV take off which has since been deleted. It is just a throttle body coupled to a servo driven from the arduino that controls the ESC. I found it easier than a drive by wire throttle body as I struggled to control it with an external H bridge...

Finished bench testing my phase 2 motor, a MSQ2600KV which should give me around 68krpm instead of 59krpm of my original motor. The original Rocket 4074 has so far proved ultra reliable and the whole system has worked pretty seamlessly in the car with some additional mapping to richen up the...