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Old 08-03-2003, 04:46 PM   #1
Scooby Newbie
Member#: 34184
Join Date: Mar 2003
Location: Atlanta
02 WRX
Now with STI VII Swap

Default UTEC plus Water Injection

What pressure (or number) do I need to put in MAP reading to get my water injection to kick on @ 12 psi via Utec spare soleniod? I am talking about the part under User Consistants.
Thanks in Advance
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Old 08-04-2003, 12:11 PM   #2
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
2002 WRX Sedan
Midnight Black


The manual says this is Absolute pressure, but isn't entirely clear. If it is absolute, that would be atmospheric pressure (14.7 psi) + gauge pressure (12psi)

In addition to this, you have to make sure that ALL other conditions are met. It is an AND fuction, between all the conditions that can activate a switch.

So you have to set
ON above RPM to a low RPM so that that condition will always be met
ON above TPS to a low % so that condition is always met
On above Air temp to a low number so that is always met
On above coolant temp to a low number so that is always met
then on above MAP to whatever you want to set it to.

Then you want to verify that this works by doing a run with a plug in and the injector aimed somewhere you can see it (like at the windshield). If it doesn't come on, try setting that value to gauge pressure (12) and do another run. It should come on when you pass 12psi.
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Old 08-05-2003, 11:08 AM   #3
Scooby Specialist
Member#: 22127
Join Date: Jul 2002
Chapter/Region: South East
Location: Oviedo, FL
2013 BMW 335i Sedan
Estoril Blue


the pressure that you put in there is gauge pressure, not absolute. I've been using W.I. for a few months now, and i use 7psi as the point to turn it on. that gives the water time to reach the cylinders before the "enhanced" settings kick in. I have the 70%-100% columns modified from 4000rpm-7250rpm. At 3750 the utec naturally starts to interpolate the settings in the 3750 row and the 4000row, so i have the W.I. come on at 3500 to give time for it to reach the cylinders. my utec maps are set to span at min. of 4psi and max of 18psi, as opposed to the default of 0 and 18, respectively.

do not try to have the water come on at the last minute, or it might not get there in time if the turbo spools up too quick and you hit those map points that are modified before the water even gets into the cylinders...your engine will get manhandled. If i ran my map without the water it would probably blow after just a few wot's.

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