Originally Posted by bc_fd3s (Post 10044231)

I've been snooping on some compressor maps with the Rotrex.

http://www.rotrex.com/Home/Technolog...ical_Data.aspx

Seems like the C30-94 would be a realistic 400whp but with not a lot of room to grow.

Or you could go with the C38-61 and spin it lower (80,000rpm) and flow 49lb/min at a 2.0VE (15ish PSI) but have room to go to a smaller pulley and up the power if you wanted to go WI.

The bracket seems very simple to make looking at Monster Garage's pics.

The thing I love about the idea of this, is the low low charge temps, lower EGT's, the Rotrex with it's planitary gear drive will have very little load on the engine at low RPMs.

And the fact that no one does it!

I also own a turbo miata, and there are a few Rotrex kits for them now which is what got me thinking of doing this on the FD. Everyone who's driven one says it feels like a big V6 in a miata. I can imagine it feeling like a BIG V8 in an RX7 with a properly sized charger.

Originally Posted by bc_fd3s (Post 10044384)

Here's another thing I was thinking. Most people don't boost with a turbo past 15PSI or so on pump gas. One would think that this is because the intake charge temps are a lot hotter.

With a rotrex, if you were boosting a max of 15PSI, the only time you're seeing that 15PSI is at redline since boost comes on in a linear fasion.

So... that being said. Could you run say... 18-20PSI on PUMP gas with a Rotrex?


PS... Can someone who knows more about compressor maps take a look at the link I posted (in the PDF files) of the C30-94 and the C38-61 and throw your input in.

Originally Posted by bc_fd3s (Post 10044110)

Yes... looks like someone has done what I'm in the process of doing. Just you wait you supercharger nay sayers. The ROTREX is the new wave of centerfugal chargers. Low parasitic load, ridiculously low charge temps and a powerband like a big V8.

I just wish someone has a bracket already for the Rotrex on the FD.

bump.

Originally Posted by bc_fd3s (Post 10044387)

With a rotrex, if you were boosting a max of 15PSI, the only time you're seeing that 15PSI is at redline since boost comes on in a linear fasion.

Originally Posted by Chomper149 (Post 10045125)

I have thought about supercharged rotaries in the past and ive had a few concerns for them. First many of us stay out of boost on newly started/ cold engines. I personally attempt to stay out of boost until it is fully warmed. Wouldnt it be bad to supercharge the rotary as regardless of whether it is hot or cold you are still forcing the same boost into the engine at the same rpm?
I am more interested in how well rotaries can handle superchargers. Any ideas on this subject?

Originally Posted by neit_jnf (Post 10046324)

there are many twin-screw supercharged RX-8's out there, supposedly better for the renesis due to high backpressure of turbos killing the side seals

Originally Posted by bc_fd3s (Post 10044387)

Since I kind of took over another thread with questions, I figured I would start a new one.

These new Rotrex chargers are starting to look very interesting.

My posts from the other thread

Originally Posted by Chudsoncoupe (Post 10044448)

I thought you could could hit max psi well below redline and hold it even on a supercharger. Isn't that what a Bypass Valve does? I always thought it kind of a wastegate and BOV all in one for a supercharger.

Originally Posted by Turbo8 (Post 10209517)

And, to date, turbo RX-8s hold records for the most horsepower AND torque, and power under the curve. I think the max torque any Pettit S/C RX-8 has put down is 190ft lbs (stock is 160ish), while I put down over 320ft-lbs with a turbo.