3 replies to this topic

[ubernoob]

Well I have found mysellf a spare turbo so more boost will be in my cars(Volvo S60 T5) future, it is currently stock running stock boost(9.8Psi).

So I need to document this otherwise it will never eventuate and I need people to chastise me for being lazy when progress slows.

Here is the plan, a 50/50 water meth mix sprayed in pre turbo by a ~300-350CC standard type petrol injector. For the people thinking the injector will sieze running water you can "supposedly" run about 2% machinists oil which will mix with both the water and the methanol and keep Mr injector doin his thing.

What I need-
Water pump- Flojet pump rated at 95Psi with overpressure cutout, the ability to run dry and handle solvents.
Regulator- Adjustable regulator which returns to the tank.
Injector- Don't have one yet but need an injector that is similar to a standard flow rate for my engine, I think it's 350cc/Min
Injector Driver- Jaycar injector driver, I was originally going to use a MAP sensor but that would have needed a fre to freq convertor to give me an input driver for the injector driver and that is too much work.
Boost Switch- This will probably be a 5Psi switch which will trigger the power supply relay for the pump and injector driver.

I am just going to set it up like a piggyback(?) setup, I am just stealing a signal from one injector and using that as the input for the injector driver. Because I will be running 50/50 water meth the injector will not flow as much as an injector flowing petrol, this suits me well as I want to run about 15% water meth mix to petrol ratio. I may have to run a slightly larger injector but I can adjust injection pressure up to 95Psi and because it is on the low pressure side of the turbo I don't need to worry about a rising rate regulator.

So all in all it seems like it will be fairly easy to do and will be more accurate than at least 50% of the kits avaliable on the market.

If you have any questions or I forgot something, let me know.
Pics of the beginnings in the next week or so.

[Captn_Awesome]

Keen for progress.
I know a few guys doing it on diesels to keep temps down as you cant just richen the AF ratio to keep EGTs down on diesels like you can, to a degree, on petrol motors.
Question - why pre-turbo? Your not concerned the droplets will to damage to the compressor wheel? Or are you hoping the turbo will vaporise the water more to allow compression?

[Captn_Awesome]

How much boost are you planning on running and would you not be better to drop intake temps using a laminova core W2A intercooler?

[ubernoob]

Before the turbo is the spot to do it as long as your spray is atomised nicely you don't do damage to the compressor wheel and the water meth mix cleans your pipework and intercooler as it passes through.
I am tempted to add a water to air cooler at a later date but the front of a Volvo is a messy affair as the Condensor sits in front of the intercooler so it is hard to do anything without cutting or altering AC lines. I will be running about 17Psi which is about the max the standard turbo will run without sending temps through the roof, the standard rods won't take much more anyway, 250KW is about the safe limit so I want to stay under that.

I am currently suffering from major boost surge or the spark is getting blown out under boost in third gear, so I need a boost gauge and a smoke machine to do some fault finding. I will probably end up replacing all of the small boost/vac lines so I won't really need a smoke machine but it would be handy.