RX-Heven Posted April 14, 2006 Share Posted April 14, 2006 What is the justification for such a large penalty with water injection? Quote Link to comment Share on other sites More sharing options...
Members Shawn M. Posted April 14, 2006 Members Share Posted April 14, 2006 What is the justification for such a large penalty with water injection? You have to REALLY want it. Quote Link to comment Share on other sites More sharing options...
RX-Heven Posted April 14, 2006 Author Share Posted April 14, 2006 I already have it and have had it for years. 6 points is absurd. Quote Link to comment Share on other sites More sharing options...
National Staff Greg G. Posted April 14, 2006 National Staff Share Posted April 14, 2006 Shawn has it right. You have to really want it. Water injection (especially with turbo engines), can be good for a lot of horsepower. If you don't think so, then go ahead and turn off your system, re-tune and dyno, and see what the difference is. On my 2.4L turbo, it can be good for up to 40 hp with the right tune. In general one point is good for between 2-6 horsepower (usually closer to 3-4) depending on the modification and the vehicle. So, even if it was only good for 15-20 horsepower, it wouldn't be "absurd". Quote Link to comment Share on other sites More sharing options...
RX-Heven Posted April 15, 2006 Author Share Posted April 15, 2006 Water injection enables you to run more boost, that is where the most power comes from. Why not just run race gas instead so I can turn up the boost to a level that 91 octane alone could not support and not be dinged 6 points for it? I'd understand if you penalised people who use racegas too. Quote Link to comment Share on other sites More sharing options...
National Staff Greg G. Posted April 15, 2006 National Staff Share Posted April 15, 2006 It is very difficult to control what goes into a gas tank, so we allow for all commercially available automobile gas and race fuel. It's much easier to see a water injection unit attached to a motor. It's a compliance issue. Quote Link to comment Share on other sites More sharing options...
Speedtoys Posted May 3, 2006 Share Posted May 3, 2006 Water injection enables you to run more boost, that is where the most power comes from. Why not just run race gas instead so I can turn up the boost to a level that 91 octane alone could not support and not be dinged 6 points for it? I'd understand if you penalised people who use racegas too. Higher octane fuel will -not- deliver what a well tuned WI motor can add...apples and oranges. You can add a few PSI with more octane, but at the addition of huge amounts of extra heat (12deg per PSI + turbo inefficiencies + IC inefficiencies at higher flow rates..etc) but WI is a kick in the pants, all things considered compared to more boost. Quote Link to comment Share on other sites More sharing options...
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