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Old 10-12-2019, 07:50 AM
RICE RACING RICE RACING is offline
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Default Re: RICESP Water Injected RX7

Quote:
Originally Posted by Rub20B View Post
Hello Peter,

What kind of water/fuel rate you usually run?

I run your old style pre turbo setup on a 13B w EFR83 and RON98.
It flows with the metering screw fully out 272cc at 1 bar, 370cc at 1.5 bar and 420cc/min at 2 bar.

At 3250 rpm 1 bar boost this nets me around 50-60% of water to fuel rate (mass based) running lambda 0.8. The car has IGN-1A coils and a bit surprisingly lights this just fine. Logically at 6500 rpm running double the air and thus fuel the water rate drops to 25% approx.

Hello Mate,

That above is about what they do as you describe it. The rates I use depends on allot of variables some but not limited to the knock threshold of the main fuel supply, how much charge cooling, what can be tolerated via the ignition system to mention a few.

What you can establish a flame front on is proportional to the excess fuel ratio and how much is inside the chamber, along with the compression ratio of the engine type it is being applied to.

A rotary engine in a road application verified by my many engine dyno tests with the sort of set up you are running will give around 80bhp to 90 bhp per liter per bar of absolute pressure when all of the parameters are within range, if you run more spark lead timing it can be easier to get it all started. Typically when you are running an engine (13B) at 700bhp range and its on BP Optimax + WM50 and its set up in 'endurance' form then its got to be run with much excess fuel and when the charge filling is at its peak and associated acceptable spark lead setting, this is when you will find the merits of a full CDI set up over inductive.

If the engine is less stressed or any of the running parameters are set optimistically, say more spark timing and less excess fuel and less overall power density, then you can get away with running different ignition systems.
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