Pre turbo water injection

[chuntington101]

has anyone tried this pre turbo water injection idea? i have heard some VERY intresting things about it. sounds like you have to make sure you run LOTS of presure and spray as fine as you can.

Anyone got any coments??

Chris.

[chuntington101]

Thanks guys. Yes that was my initial thoughts and from what I have seen used before. However from what I have heard injecting the water pre turbo helps absorb the heat as the air is compressed inside the turbo. This results in a lower temp after the turbo. As the air temps are lower the turbo work much more efficiently, thus taking less exhaust gas to produce the same pressure.

Some people are using this in conjunction with a conventional methanol injection system and these results in very low intake temps.

Also by injecting water as apposed to say methanol, commonly injected after the turbo, you run less risk of damaging the ally comp wheel.

Has anyone tried this or seen anything about it?

Cheers

Chris.

[chuntington101]

Boosted LS1 said:

I used to squirt into the compressors and didn't have any problems. It was a very crude arrangement to

i have heard Bike guys simply tapping of the boost presure and then spraying through a cheap nozzele! lol guess is mean you dont need a hobs switch! lol

think the systems now run very high presure pumps 9250psi) and very fine nozzles.

Did it work for you mike? has anyone got any logs of temps before and after spraying?

Cheers

Chris.

[chuntington101]

Thanks for all the coments guys.

I am intrested in PRE TURBO injection only. i am aware of the benifits to injecting water after the intercooler.

Boosted or anyone else thats tried it, i dont suppose you have any temps before and after injecting that water do you? also did you use water or meth or a mix? is there any advangtages to using either/a mix?

Matt, thanks for that i'll take a look on their site!

Cheers again,

Chris.

[chuntington101]

Wedgepilot said:

I looked into this a few years back, and I'm pretty sure the best place to spray was just after the intercooler. The finer the spray the better, so powerful pumps running high pressure are the order of the day.

The water lowers the temperature, plus the presence of water itself helps delay pinking/knock by slowing the flame front.

It's very common in diesel tractor racing in the US (I kid you not), and IIRC, the RAF did some research into it back in the 40s for their supercharged engines.

WW2 aircraft actually used a 50/50 mix of alky and water from what i have read. Red dragon (P51 Mustang with a Griffin engine) ditched the original aftercooler and ran pure water/meth injection to cool the intake. also you have to remember that they ran a MASSIVE carb PRE turbo. wonder what effects that had on temps???

Cheers

Chris.

[chuntington101]

GreenV8S said:

Water has a higher latent heat of evaporation, but you can only evaporate a finite amount of water before the humidity reaches 100%. Methanol evaporates better at low temperatures, and if the water humidity reaches 100% you can still get methanol to evaporate (until the methanol reaches saturation). Methanol also has a higher octane rating than petrol so helps nudge the overall charge octane rating up.

Green, is that really true that even at 100% humidity methanol can evaperate???? its just i read somewhere that if you ran say water injetion pre turbo to get 100% humidity and then post turbo (post intercooler if you still had to run one) meth injection upto 100% saturation, you could then run a third chemical for even more cooling. is this true???

also if the water droplets are small enough do they stay suspended in the air? i was thinking like a cloud. this would help with the pre turbo bit wouldn't it?

[chuntington101]

annodomini2 said:

chuntington101 said:

Wedgepilot said:

I looked into this a few years back, and I'm pretty sure the best place to spray was just after the intercooler. The finer the spray the better, so powerful pumps running high pressure are the order of the day.

The water lowers the temperature, plus the presence of water itself helps delay pinking/knock by slowing the flame front.

It's very common in diesel tractor racing in the US (I kid you not), and IIRC, the RAF did some research into it back in the 40s for their supercharged engines.

WW2 aircraft actually used a 50/50 mix of alky and water from what i have read. Red dragon (P51 Mustang with a Griffin engine) ditched the original aftercooler and ran pure water/meth injection to cool the intake. also you have to remember that they ran a MASSIVE carb PRE turbo. wonder what effects that had on temps???

Cheers

Chris.

The merlin and griffon are Supercharged, but the effect is the same.

DAM IT! sorry mate your right its a massive great supercharger. sorry that was me typing and not thinking! lol

Chris.