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Old 07-16-2005, 10:00 PM   #1
Joey_WRX
Scooby Newbie
 
Member#: 61371
Join Date: May 2004
Vehicle:
2002 BMW 330ci
Alpine White

Default Need some help with Hydra install...

Im getting my Hydra setup in my 03 WRX right now, and I have a few questions. First off, regarding the optional O2 sensor, I know this is suppose to be installed in the rear O2 on the WRX. Its not in the installation instructions, but am I suppose to re-locate the rear stock O2 sensor to the front location? Someone eluded to that on another board, so just looking for more input. As for boost control, do I just need to use the stock boost control solenoid if I want the Hydra to control boost? And if so, on line on the stock solenoid is wastegate of course, and the other runs back into the the turbo inlet hose witch I no longer have, so where do I need to route this line? Any help would be much appreciated, as Im VERY close to getting this thing running. Thanks.
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Old 07-16-2005, 10:28 PM   #2
bboy
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Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
Dirty White

Default

Replace you narrow band sensor (yellow cable) with the wide band one at the same location (after the down pipe). Leave the stock "front sensor" in place (blue cable).

Do NOT put the narrow band sensor (yellow cable) into the front location. It cannot handle the heat.

Unless you are already running aftermarket boost control, when you wire in the Hydra, it take control of boost control using the stock solenoid. Control of the solenoid is via PWM map 4, some PID settings in Settings, and the Boost Threshold map (basically maximum boost before fuel cut).

You can either run the solenoid exhaust line into the intake, or just let it vent to atmosphere. I idea behind running it into the intake is that with a MAF system, that air is already measured--with MAP it doesn't matter.
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Old 07-16-2005, 10:30 PM   #3
pux888
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Member#: 8356
Join Date: Jul 2001
Chapter/Region: MAIC
Vehicle:
02 STi swap
12 WRX limited

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you wont need the stock one since your using the hydra for all functions. not trying to be a dick but if you dont live near a good tuner you may be for a rough road ahead. read the directions to start.
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Old 07-17-2005, 12:54 AM   #4
bboy
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Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
Dirty White

Default

It won't be bad. PM me or one of the other Hydra owners or Phil and you'll be up and running quick.

If you follow Phil's directions it will go fine. After you get the car started use Tools-->Log Data to get a quick peek that all your sensors are working. Usually the next thing to to is tune the boost control. Your peak boost level is something that Phil or others can give you an idea what's best to shoot for. I'd leave most of Phil's settings in place and work with PWM Map 4 to adjust the level of boost. If you find you are still not satisfied with the characteristics of the boost curve, you can begin looking at some of the other settings that effect that.

Once the boost is set up to your liking. You'll want to log data during a "pull" from around 2500 RPM to 7000 in 4th gear. The log will help you and others gauge how appropriate the base tune is for your car. If it needs adjustment, Phil can help you out.

There are going to be some basic drivability functions (starting conditions, dynamic fueling, fueling under vacuum, maybe tip-in fueling) that you may want adjust after you drive the car for awhile. None of them are terribly difficult to work on, but you'll need to know when they occur, or under what circumstances.

The Hydra is a stand alone so there is more to think about, but you can adjust everything so there's not much that cannot be fixed. For me, half the fun is tinkering and learning how to tune all aspects of the engine management. So, have fun!!

By avoiding certain settings, and making small rather than drastic changes, you are highly unlikely to do anything that will harm you car. It's just a matter of taking the time to adjust one thing at a time, and adjusting in tiny increments. Take notes and keep track of what works and what doesn't. Phil can make several changes at once and expect to get a lot right, but even he takes a few "pulls" to get things dialed-in right.
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