Intercooler vs water/meth injection.

[dvk-kp]

Gidday guys, I'm doing some research into supercharging my 3.5 Pajero.
I have an eaton m90 off a early 90s Ford Thunderbird which run an air to air front mount intercooler from factory and about 12 psi.
I'm going to run my supercharger more like a commodore setup pushing straight into the intake manifold, so intercooler isn't as straight forward.

Would I be better off going to the effort of mounting an oil cooler underneath the SC and running it like a water to air IC or going with a water/methonol injection setup? Pros and cons of each?

Or no cooling at all and just take the simple road?

Ideally I'd like 10-12psi...

Thanks

[tweake]

as much as i love water injection, the problem is you go through a lot of water/meth.
so intercooler is preferred.
just check the supercharger, i hear early ones can be damaged by the methanol. later ones use coated rotors so not an issue. i don;t know much on it but just something worth checking out.

intercooler under superchargers is interesting. one issue is the pulses off the supercharger can damaged the fins of the intercooler. so quality and design will be important. tho its better on a twisted tri rotor than on a straight roots.

[dvk-kp]

How much water does it use roughly? Could hold a biggish tank.

I've seen intercooler a under 6/71s etc. rotors just look machined alloy to me. Curved tho.

[tweake]

How much water does it use roughly? Could hold a biggish tank.

I've seen intercooler a under 6/71s etc. rotors just look machined alloy to me. Curved tho.

kinda hard to answer unless you find someone with the exact same setup as it depends a lot on the setup and how its driven and what sort of roads.

keeping off the boost and setting on point up high will keep usage right down. i would have to check one of the calcs and see what nozzle size you would run. i'm diesel but basic principles apply.
supers charger also produces more heat than turbo so it would be on a bit earlier than you would for a turbo engine.
also if you run a pre super or not.

the 6/71 blowers are hard on intercoolers, at least for drag racing. i'm not up on current play but i guess they would make the IC with thicker fins etc. stronger but reduced cooling.
but piping it out to an external IC rather than under the blower would help dampen the pulses. eg thunderbird and toyo MR2 etc.

[dvk-kp]

I was thinking of just running a micro switch on the throttle body so it only sprays water with wide open throttle... On road cruising it shouldn't need it. But I'm not sure that's why I'm asking for other people's input.

Would the amount used vary depending if it's pre supercharger or after? Or just much the same?

As for the intercooler, I've never actually seen one in person but I do know they are out there. So your saying the pulsing of the air is strong enough to do damage to the fins? I didn't think an M90 at 10-12psi would be?
How bad is the pulse? I don't have much experience with supercharging but keen to have a go.

Thanks for your input tweake, it's good ta have someone to bounce ideas off.

Thanks
Cole

[churchill]

I'm making an educated guess here but I suspect that if you can a front mount the ic the plumbing from the blower to the ic will attenuate pulses from blower. This is quite a common practice in engineering.

[dvk-kp]

Oh ok. I wanted to put in on the intake manifold for ease of plumbing etc. do you think the pulses will cause a problem?

[Big]

Have a read here, this is from lextreme , not sure what motor but there is a really good read regarding the proz and cons and setup etc.. they do get into a bit of detail so it makes it easy to make your decision

http://www.lextreme.com/forums/showthre ... water+meth

[tweake]

Have a read here, this is from lextreme , not sure what motor but there is a really good read regarding the proz and cons and setup etc.. they do get into a bit of detail so it makes it easy to make your decision

http://www.lextreme.com/forums/showthre ... water+meth

just had a quick read but looks like big difference is they are using whipple screw charger. that doesn't have the pulses like roots style superchargers.

the other thing to remember is good efficient water/air intercoolers are expensive.
i would not want to use a cheap one sitting under a blower.

fitting a front mount is a much better idea.

[dvk-kp]

Cheers for your input guys. That guys build on lextreme is next level. But interesting reading.

I thought thos whipple ones were a bit different.

So all in all you wouldn't recommend using an alloy oil cooler as an intercooler underneath? Don't want to go the front mount route. After a factory style install, supercharger on top drawing thru factory throttle body as close to factory location as possible and then keep the factory airbox and my snorkel etc.

Might look into water injection a bit more, for simplicity reasons. Maybe even lower my boost goal... Maybe 8-10psi.

[Big]

Might look into water injection a bit more, for simplicity reasons. Maybe even lower my boost goal... Maybe 8-10psi.

Exactly why im going down this route.. easy, I have a kit , will do what the intercooler will do and on a plus side up the power keeping things in check

[dvk-kp]

Might look into water injection a bit more, for simplicity reasons. Maybe even lower my boost goal... Maybe 8-10psi.

Exactly why im going down this route.. easy, I have a kit , will do what the intercooler will do and on a plus side up the power keeping things in check

A lot to be said for something nice and easy. Not wanting to make this into a huge expensive project. Just a bit more torque for a bit of elbow grease!

Hoping sucking thru the factory AFM will mean it'll run sweet as on factory ECU