RX8 Renesis Rotary eSC
- Thread starter brettus8
- Start date
r.brown.bayliss
Member
Yes, it makes sense that the PSI would drop as RPMs rise. Unless the compressor is increasing speed as well, but then having as much boost as you can at any point is better than reducing it in the middle just to make the top look better.
Nice to see it moving forward
I've often looked at this trend and imagined being able to achieve a max boost level that was too high from launch, to just over midrange rpm so that the excess could then be parsed in to sustain a long flat power peak as the excess boost became appropriate/safe to apply with the increasing and less efficient rpm region where boost would normally start to drop off, in an effort to give acceleration an infinite feeling of power.
I'm hoping the new outfit from Castle that Alex ordered will out perform the 2028 results that he recently demonstrated, if it does I'll be putting in my order. I thought the TP power 12Kw, 85k rpm motor geared down for torque multiplication while still able to maintain good relative compressor speeds would have been a more productive performer with the benefit of the torque multiplication added to its high rpm, but at $400 and approximately a month long wait compared to the Castle outfit, maybe not.
Here's a great video on a very doable car alternator mod that yielded 90 volts and a max current of 100 amps that I believe will inspire everyone intent on having an onboard battery charging system.
I just read through this whole thread and really like what I am seeing/reading. Thank you for sharing and thanks to all that replied.
I do have a question for Brettus8, what elevation are you at when doing this testing? I guess most specifically where you had the car on the dyno.
I do have a question for Brettus8, what elevation are you at when doing this testing? I guess most specifically where you had the car on the dyno.
Hamilton NZ which is at 40m above sea level.
After fitting a larger drive wheel and upping the voltage I started getting the issue seen below. Wild MAF sensor swings and an odd noise from under the bonnet. Spent the last day trouble shooting. Tried retiming the ssv valve, changing the water injection amount etc etc and was running out of ideas. But while contemplating my navel this afternoon it hit me! Compressor SURGE! This is what it does to mass airflow at low rpms. Raised the ESC turn on by 500 rpms and .......... all gone.
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Great problem display and accompanying solution for anyone who observes similar data in their build.
Thanks .... the mass airflow numbers actually line up perfectly with the compressor Flow map Alex recently updated too! Renesis flow in purple from 3500rpm to 8500
Also : I think I found the limiting values for the hobywing max 4 ESC . It trips out when over 300A for more than 4.5s (approx). Doesn't seem to matter how far over 300A you go........
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