Hello,
I've been running a 2 stage system on my supercharged 993 for about 3 years now, no intercooler. I run a 0.6 as the 1st stage to avoid too much flow at low rpms and add a 0.7 from about 4500 rpm up. 50:50 methanol:water mix. My water:fuel ratio varies as a result from about 8-15%. I also use a pre-pump priming pump to boost the flow potential of the race pump to about 450cc / min tested with good atomisation. The car just loves it. I have tuned the car AFR lamda as a result to between 0.84 and 0.87. You will probably need a little more than me given mines only putting out about 380hp.
BR, Mark.
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