Turbo on RX-8

[mazdamaniac]

Originally Posted by phoenix7

The TII is 160-170whp and with ~1200 bux you can make 300HP

Its already a turbo car. Doesn't count for this comparison. Try making that power that cheaply on the GTU.

Originally Posted by phoenix7

As far as sequentials:
I thought it might help with the top end. I see that the Greddy upgrade in your charts has great low end that tapers off after 6K RPMs in one graph and 7.5K RPMs in the other. Wouldn't a second turbo maintain linear power all the way through the powerband? Similar to the FD setup?

Power tapers in the high-end of the Renesis because of the flow restriction of the exhaust ports.
The Renesis has a very wide power band, but it isn't going to be all at the top like a peripheral port 13b.
Once the gas velocities get really high, the right-angle turn of the exhaust ports becomes a restriction.
The high power output Renesis applications you will see in the future will make their peak tq at 6200 and hp at 7200 max.

Originally Posted by Herblenny

If you could get this system to work for stock turbos and extract as much power potential as you claim (close to 400WRHP), just by the swap, stock FD set up without changing the turbo, you'll hit the market!

The problem with the FD turbos are they don't flow enough air.
You can tune all day, if the air is hot coming out of the turbos (low mass) the power won't happen.

[Herblenny]

Originally Posted by mazdamaniac

The problem with the FD turbos are they don't flow enough air.
You can tune all day, if the air is hot coming out of the turbos (low mass) the power won't happen.

People have made upwards 380ish RWHP sequential via MAP system on stock twins.

99 sequential turbos also made around that HP with quicker spool.

BNR's have made over 400RWHP sequential in MAP system.

So, Are you saying that its the temperature of the air that might cause problem of tuning MAF based system?? Again, I'm not an expert in MAF tuning.. but doesn't air temp gets measured by MAF sensor?? or is there another sensor after TB?? And when running EtOH/Water inj. Do you shoot before MAF or after??

[Phoenix7]

Originally Posted by mazdamaniac

Its already a turbo car. Doesn't count for this comparison. Try making that power that cheaply on the GTU.

you got me there. You're right.

Power tapers in the high-end of the Renesis because of the flow restriction of the exhaust ports.
The Renesis has a very wide power band, but it isn't going to be all at the top like a peripheral port 13b.
Once the gas velocities get really high, the right-angle turn of the exhaust ports becomes a restriction.
The high power output Renesis applications you will see in the future will make their peak tq at 6200 and hp at 7200 max.

Makes sense, what exhaust manifold does the MM turbo use?

The problem with the FD turbos are they don't flow enough air.
You can tune all day, if the air is hot coming out of the turbos (low mass) the power won't happen.

[mazdamaniac]

Originally Posted by phoenix7

Makes sense, what exhaust manifold does the MM turbo use?

Its the GReddy cast iron manifold.
Pretty decent piece - the flow cross-section is about equal to the port area.
I've been thinking about an Extrude-Hone to increase flow a bit.

Originally Posted by Low Impedance

i think the problem is the turbos are getting out of their efficiency range when you start getting up there.

Exactly.
Even though the pressure is rising, the mass is holding because the heat is going up.