It's not only about cooling and reducing detonation but also cleaning! In general removing carbon deposits is good, reducing potential hot spots, reducing the chance of sticking seals, etc. but It just ocurred to me that there's another cleaning benefit that I haven't seen mentioned: SPARK PLUGS

I currently daily drive on 11 heat range spark plugs which not only helps lower the chance of detonation but also helps keeping the spark plug area cooler which may reduce the apex seal skipping problem... maybe Im wrong here but could it be?

I had the water injection system disconnected for a while and the plugs would foul after maybe 400 miles, I even thought the engine had blown when it happened. After I took them out and cleaned them all was fine until yesterday when it started missfiring again but since it was mild I decided to reconnect the water injection and see what happened. Well, the missfiring was cured!

It's also nice to again see the AIT's going down every time I boost.

My current system is boost activated, 20% duty at 2psi linearly going to 100% at 10psi. 1xM2 nozzle pre-twins and 1xM4 at the Greddy elbow, 200psi pump spraying 100% distilled water with a high speed valve.

And why 11 heat spark plugs? I was using 10's EIX for a long time with no problems and needed to change them due to age so I decided to buy some Greddy Racing Rotary plugs (NGK 7420?) and I only found them in that heat range and since they are expensive I plan on using them as long as they last.

 

I use 11.5 spark plugs in my street car NO WORRIES. they have been going for around 5000kms now.

 

Absolutely right, neit_jnf. I'm a firm believer that a reason why a lot of these engines blow up is because we run too damn hot of a spark plug. I think those of us who boost w/ single turbos well past the point of a stock horsepower setup ought to run at least 10's all around if not colder.

B

 

Can you explain your setup? I want to move my AI pre turbo as well. Are you running sequential? You said you have one nozzle pre turbo and one in the elbow.

I am trying to find an easy way to spray both nozzles pre turbo but havent figured it out yet.

 

Yes, I'm running sequential and my setup is stupid simple, I just installed the nozzle at the center of the endcap of a twin-inlet kn filter.

When the secondary comes online the water injection gets shared between the two.

 

Thats so damn perfect and the same thing I want to do in a month when I got my AI-System...
also the nozzle sizes are the same you have chosen.

I have the KnightSports Cold Air intake and want to mount one nozzle @ the top of the Airfilter, too..

Have you ever checkt your Filter if the spray has reached the Filters "walls" ... or not?
Because making the filter wet shouden´t be a good thing.

PS: are you running 10PSI max???

 

I haven't verified if the filter gets wet, will do but I figure airflow will prevent this from happening.

My current map is untuned, I'm playing with the idle settings before I tune it, that's why I only run low boost. Sometimes it will go to 15 due to boost creep but the map is super rich, 10:1 in boost so I'm not worried.