water injection nozle size

[sdminus]

18-20% is too much water. It will bog down the ign and loose loads of power. may be if you had 500 or 600 hp this would apply. like i said its dependent on the weight of air flow and fuel.

Scott

[kev-yorks]

18-20% is too much water. It will bog down the ign and loose loads of power. may be if you had 500 or 600 hp this would apply. like i said its dependent on the weight of air flow and fuel.

Scott

Not been on the dyno for a year Scott but the last estimate from a well respected engine builder was at the upper end of that scale with current mods and boost so i guess i\'m aiming in the right area with the amount of water.
Kevin

[sdminus]

ASP. My advise is to build the car and have it mapped etc with no water. Then go back and have it re tuned to take advantage of the system. If i wasnt going to tune for water then i would add a small amount of water post inter cooler say 1 gph or less. I would not recomend going pre inter cooler.

if you get stuck sdminus@yahoo.co.uk

Scott

[stuart wizy]

water injection is a lot more in depth than i thought!
good info guys
scott I might need a chat with you when i get my fc run in. if you dont mind that is

[maximtaylor]

Well worth reading this lot when you get time, it will help you catch up with some of the theories behind WI.

http://www.waterinjection.info/phpBB2/

[asp]

yes im lost here,tel me in a slow easy to under stand way how to work this out,id like to learn how to do it,air flow?how much fuel?air temp? all these thing matter do thay,

its easy to get some to say 450 hp yep you need this nozzle,learn mode on, why do i need that size,

[asp]

Well worth reading this lot when you get time, it will help you catch up with some of the theories behind WI.

http://www.waterinjection.info/phpBB2/

better go get a cupa b4 i start 2 look at that lot,

[sdminus]

The water injection forum is very good. Bill Shurvington very clued up on this subject but sadly no long on this forum.

As a rule of thumb most use a 10% fuel to water ratio but i believe the corect way to calculate this is using weight. add to this the air temp and you should be close.
I am still searching for the correct air fuel ratio in realtion to fuel water ratio to achieve optimium power and efficiency. To benfit from water and not loose power you will either have to displace fuel with water or run a tiny amount.
i have not tested my theroys yet but i am learning a **** load in the process.
simply put at 14.7:1 the fuel and air will burn efficently. With a turbo car you add fuel to cool the combustion. Water or water and methanol will enable you to lean the actual fuel air ratio closer to stoich (14.7:1 petrol) than you could otherwise due to the latent heat capacity of the mix. how close you dare go is the question?

Scott

[maximtaylor]

Putting in fail-safes is important as well. You don\'t want the water cutting off and blowing the engine

[maximtaylor]

14.7:1 is good for a clean burn, but the ideal \'power\' ratio is richer than that. Around 12:1 - 12.5:1 for piston engines and a tad richer for rotaries imo.

simply put at 14.7:1 the fuel and air will burn efficently. With a turbo car you add fuel to cool the combustion. Water or water and methanol will enable you to lean the actual fuel air ratio closer to stoich (14.7:1 petrol) than you could otherwise due to the latent heat capacity of the mix. how close you dare go is the question?

Scott

[kev-yorks]

simply put at 14.7:1 the fuel and air will burn efficently. With a turbo car you add fuel to cool the combustion. Water or water and methanol will enable you to lean the actual fuel air ratio closer to stoich (14.7:1 petrol) than you could otherwise due to the latent heat capacity of the mix. how close you dare go is the question?

After speaking to a couple of tuners in Aus Scott i\'m aiming for a A/F ratio of 13.2:1 with a 50/50 water methanol mix on final tune. just taking it slowly down towards that point one stage at a time.
Kevin

[sdminus]

Max thats where the experiance comes in to play. :Thumbsup!

I would be interested to hear your thought on the correct WI afr. sdminus@yahoo.co.uk

I have heard of rotaries running 13.0 afr\'s at 20 odd pound of boost.

sorry asp im getting this way off topic mate.

[sdminus]

Kev you sound like you and me are shooting in the same zone. This link may be of interest and may well help. There is some great info on this but it is still treated like a dark art but in the correct hands can really help to make your rotary more efficent

Scott
http://not2fast.wryday.com/thermo/water_injection/opt_mass.shtml

[kev-yorks]

Got to agree with you Scott ratio\'s and timing are the two area\'s that are still top secret as regards tuners its a case of gleaning little bits of info here and there and piecing them all together if your a DIY\'er. Does sound like we are aiming in the same area though.
Kevin

[stuart wizy]

scott and kev, have you got wideband sensors set up to check afr, if so what type and do they have interface for lap top