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Old 10-15-2014, 02:17 PM   #1
Scooby Newbie
Member#: 68457
Join Date: Aug 2004
02 wrx

Default Unequal flow with water injection

I recently installed one of the off the shelf water injection kits and pulled the spark plugs about a 1000 miles later to see how they looked. Two of the plugs seem to be a different color. These two plugs correspond to the rear two cylinders on my WRX.

The injector is mounted in the intercooler right before the throttle body. If two cylinders are getting a lot more water, this could cause lots of problems with the tune later. I am only running a 1 gph nozzle. I have some nice clear pictures of the plugs, but I don't have them posted online anywhere.

Has anyone else seen this happen before?
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Old 10-15-2014, 10:40 PM   #2
Scooby Specialist
Member#: 283711
Join Date: May 2011
Chapter/Region: NESIC
Location: Newport
2012 STI sedan
Black with scratches


It could be any number of things besides your wmi. Like.. Per cylinder fueling, or your fueling setup, per cylinder timing, injectors etc.
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Old 10-23-2014, 08:41 PM   #3
Scooby Specialist
Member#: 348254
Join Date: Feb 2013
Chapter/Region: SCIC
Location: San Diego, CA
2013 WRX


This has alway been a concern with water injection. You can inject to each runner it you want, but it really isn't necessary. The vapor should atomize and, in theory, even distribute. There are studies about it and turns out you can find data supporting either theory. Countless numbers of people run port injection just fine.

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