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injection. On a turbo engine your maximum timing is limited by detonation. If you could advance the timing more, it will continue to make more power - well into the 30 degree range, and then it will begin falling off again as advancing the timing too much begins working against the engine. The water injection setup we are planning to put out there for Z owners will have an option for an EPROM switch I developed, of which has two programs on it to allow for different configurations, selectable by a toggle switch. That option is $150, and we have been using it extensively with cars we have taken to the dyno (which is why I tune for pump fuel as well as for race fuel - to build two programs so that I can put both of them into the ECU). What I have found is that you can easily get away with 5 more degrees of timing advance with the water injection on. Typically there is about a 5HP increase in power per degree of timing. I haven't put it on a dyno yet to see what kinds of HP gains per degree of timing the engine will see with the water running, but I expect that number to increase as liquid water to gaseous water has an expansion rate greater than that of fuel burning in oxygen. There is a ton of power in steam.
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