r.martin wrote: ↑Mar 15, 2023 12:36 AM For the record and likely my later reference, the turbo has the following specs
Journal bearing/oil cooled
Which seems to put the ratios at the following, (there is a part of me that hopes the turbo never truly spools)
Exhaust A/R 1.05
Intake A/R 0.66
On reference to a catalog from precision turbo, these dimensions are almost identical to one of their larger models. I chose this turbo as once I realized the supercharger was going to be a real thing, I felt that I needed an engineering justification for the blower, and a large laggy turbo felt like it would legitimize the design. (I suppose by this same legalization logic, the fact I no longer have an oil dipstick is going to justify an external oil tank and belt driven pump) The driving experience I want to achieve is something "raw & intense" which I recognize doesn't equate to "fast". Further riding on bags doesn't exactly rhyme with "fast".
I openly admit that this project has become an art piece first and a "performance vehicle" as a lesser priority. I am really just perusing an experience at this point, and perusing this vision in my head. I have a good friend who couldn't relate to the goals and thought the combination of 4" throttle body, manual steering rack, and un-sprung 6-puck clutch combined with the weird motor would be really unpleasant. Which I hope this is not what I create, but regardless I have painted myself into a corner here and need to continue building a representation of my self-perception.
I really liked the clean unbranded look as the smooth lines visually harmonize with the valve cover shape.
Thanks for sharing those specs... that is a big turbo! But you will be pushing more air through the engine with the supercharger.
Did you already share specs of the supercharger?
It seems like to me you'd want the SC to be able to push 30% more airflow than the standard M30 via the supercharger boost level to be able to really take advantage and feed the turbo. With that different intake manifold, theoretically you could be flowing a fair amount more than the stock engine.
Curious how much you have worked through these numbers at a few rpm ranges. Or are you really just going to see how it runs and then change the SC pulley and boost level?