water injection nozle size

[sdminus]

Its sad kevin but true. i could tell you the people that know but they wont share there secrets. one way or the other we will get there. I am lloking at going AI in place of WI. This method is much easier but with slightly less gains but a little bit more pioneering.

My basic problem with the public domain info is the ratios.  sound me out but if water is 3 times the heat capacity of petrol then why is it suggested to replace 7% of fuel (1.0 afr) with 10 % water. or am i touching on a subject which is a hush hush with those who really know.  

Scott

[sdminus]

Stuart i have a LM-1. poor weather this week and the fact i am still waiting on parcel force for the water injection controller from david. When the weather clears i will finish my fuel map then we can play

Scott

[bnaellis]

13.?? afr what was this n/a ?
Even piston engines don\'t lean out that much in gains for power.
If you want to experiment with afr, on how lean you can go in a quest for power, fit an egt gauge and take your car on the dyno and make the adjustments rather on the road. The dyno & egt gauge will atleast verify whether certain adjustments you have made i.e leaning out to 13.?? afr is good bad or ugly.

[kev-yorks]

Stu running a innovate LC1 and auxbox for A/F ratio\'s and data loggin purposes plus the loggin on the microtech.
kevin

[bnaellis]

what nozle size are you guys useing,also where have you mount\'d the injector,

I currently run 7.37 gph nozzle, it\'s located in my greddy elbow.
I currently run a 10% ratio of water to fuel.

[sdminus]

below is a great mail written by Bob Harris a few years back explaining, in far more lucid prose than I could ever hope for. Key points to note in the text:

1. Water speeds up the key reactions releasing energy to the crank in a sharper peak. This means more power at the wheels. Note the comment that 2/3 of the energy released in combustion comes late in the cycle without water present at the beginning. This is less of a problem in a rotary than a piston, but you still lose leverage on the eccentric (note I haven\'t looked at it from a heat lost to the rotor perspective).

2. Water injection has been shown to give very significant increases in max power

3. At >35% WI it has been shown you can run under boost all the way back to stoich without detonation in piston engines. No reason a rotary shouldn\'t be similar. Extrapolating this you can see that you can also run more advance (more power) and also use AFR to control power output, rather than run stupidly rich just to prevent engine death, or backing off the spark so you loose lots of the HP you paid for.

Thanks Bill

[sdminus]

i qoute from RICE. ( a man i really respect as a tuner)

People may not believe this, but I ran 472rwhp on Optimax fuel @ 19.9psi boost 9.0:1 compression engine with 13.7 to 13.9:1 AFR at WOT.

Did it three times and many more times before and after the dyno runs up to 23psi boost (even leaner AFR !!!).

This was with a water ratio of 18% there abouts anyway

[kev-yorks]

Brian running AF ratio,EGT,RPM,TPS and manifold pressure data loggin with the auxbox. In addition to the normal data loggin on the microtech.
Kevin

[stuart wizy]

i need to learn more about fueling my fc engine, when ive built it that is!
do think i should run wat inj with big turbo and big boost even tho its having big front mount, and only being used up the strip

[kev-yorks]

Yes Stu use the Wi and front mount as the lower air temps is only part of what the water injection does for you.
Kevin

[stuart wizy]

can i have my coolingmist kit back then kev?!!!!!!!!!!!!! :spank
scott what kit should i get and how much are they for a
full bridge and big turbo lots of boost

[sdminus]

Stuart i would consult the top tuners for advice as i can only coment for my own goals.

I respect Brians and max\'s experiance and knowledge so i would start there unless you wanna spend months looking for a magical number like i have and so far failing.

Scott

[kev-yorks]

Hate to tell you this Stu but the one you sold me\'s about as good as it gets they now do a controller so you can match the WI to the injector duty Cycle and no i\'m not selling it back.
Kevin

[sdminus]

Kev i have this controler in the post  as we speak/type

Scott

[stuart wizy]

by the time ive got this fc running you 2 will have perfected the art  of water injection, then you can set mine up for me flyin up the strip :chat
thats what test and tune days are for!!