Chemical intercooling as opposed to adding a FMIC? (T1 mitsu)

[flatlander757]

I've been reading and this alky/water injection thing seems really flippin neato

I've read a lot on here and I THINK I would like to give it a try instead of spending about the same amount of money(though probably more) aquiring a different radiator/intercooler/airbox/hoses/fittings/clamps/etc etc.

An overall goal for my car is to have a quick car in the 12-13 second 1/4mi range on DOT tires that is basically a wolf in sheep's clothing. Adding an intercooler of course makes it look much more potent in the eyes of ricers... it's fairly reasonable to think "he doesn't have an intercooler, it's got no real potential" since you can't -see- the intercooler in plain sight.

For the time being I want to run up to 14psi on my little mitsu... of course it gets crazy hot and my car is pushing 140k miles, so I don't want to do that without some form of intercooling.

In my own logic it seems that a Devilsown progressive kit would be the wisest choice since I don't have an air-to-air IC to take car of the low-mid boost levels so it would be good to have it come on gradually from like 6psi on.

I've read a few pages that explain alcohol/water injection in general, but I've got some other questions:

If you have the stock computer cal taking care of your fuel, wouldn't alcohol injection screw up the A/F ratio? Or does it take so little that it's more-or-less unaffected(unless you're purposely using it as your fuel of course)? Or would that call for straight water injection so it only cools and doesn't act as a fuel?

Would it be possible to only have a controller provide enough alky for cooling up until 14.7psi and then dump much more to take over fueling as well(after zenered MAP of course)?

[Devilsown]

yes, it can affect your a/f ratios. How much depends on what size nozzle you run. The bigger you run the more cooling you have. So its a catch 22.

We don't currenty have a way to do something like that.

[flatlander757]

Quote:

Originally Posted by Devilsown yes, it can affect your a/f ratios. How much depends on what size nozzle you run. The bigger you run the more cooling you have. So its a catch 22. We don't currenty have a way to do something like that.

I was actually thinking to myself to devise a way to make that work... Here goes:

What if you run a basic injection system with one of the smallest size nozzles available starting at say 8 or 10 psi...

Then use a pressure switch to open the circuit for the progressive controller to spray a second nozzle from 14psi on up...?

The basic system would be spraying the entire time, but at lower boost levels it will be enough to do a bit and as the boost climbs it will become negligible so as long as the progressive is tuned right you should be fine, no?

[whistlin']

In theory that would work. But if your initial use of the alky injection is to cool the charge, then a water/meth mix will be more effective and less likely to screw with the air/fuel ratio. The investment of the pressure switch and nozzle would be the same whether you used gas or alky. You may want to think of going with the cold start(s) and pressure switch with gas and just use the progressive kit for cooling. These are just my thoughts, as I have no experience with the cold starts, just the progressive kit.

[flatlander757]

Quote:

Originally Posted by whistlin' In theory that would work. But if your initial use of the alky injection is to cool the charge, then a water/meth mix will be more effective and less likely to screw with the air/fuel ratio. The investment of the pressure switch and nozzle would be the same whether you used gas or alky. You may want to think of going with the cold start(s) and pressure switch with gas and just use the progressive kit for cooling. These are just my thoughts, as I have no experience with the cold starts, just the progressive kit.

Alright thanks! I actually just happened upon a free FMIC that a DSM guy isn't going to be using so I'm much more inclined to do the work associated w/ intercooling my mitsu