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Old 04-25-2005, 12:00 AM   #1
reddevil
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Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default Should I get engine management if the motor is running fine?

I am running 7psi starting at 1500 rpm, climbs to about 9 at 6000 rpm. This is produced via a supercharger on a NA 2.2 block and ECU. If I run 94-96 ocatane fuel (made by mixing some tolulene into premium) I don't suffer knock. I have dynoed at 152 whp and this was with a clogged fuel sock and one sparkplug wire not connected properly. The stock NA 2.2 got about 90-100 whp. I get decent milage when sane (19-22), 12-16 when not.

So is there any reason to upgrade to anything if the wagon runs fine? Would I benefit by a huge margin or just slightly?

Thanks.
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Old 04-25-2005, 10:11 AM   #2
rexorama
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Join Date: Oct 2002
Chapter/Region: NWIC
Location: bk-industries.com
Vehicle:
03 MBP Sedan
02 PSM Wagon

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The best thing to do would be to data log somehow to see what your motor is doing exactly. EM and the ability to tune can do more then just add power by fine tuning, it can also smooth out the power band (if it need to be). There could be as little as 10-15 WHP there or as much as 30. On top of this, EM will give you the ability to possibly add more boost. You may also increase milage with fine tuning. Your motor is running without knock right now, but that doesn't mean it's running well.

Sounds like a nice setup you have.
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Old 04-25-2005, 07:09 PM   #3
awilson529
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11 Mazda

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Are you atleast running an EGT? If so, what's it read? If not, how do you know it's running fine?
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Old 04-25-2005, 07:52 PM   #4
reddevil
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1990 Legacy wagon
goes 12.387 @ 116.5

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I have a Greddy EGT guage. Only the probe is longer than the diameter of my exhaust!

I am assuming it is running fine cause nothing has melted or broken yet in the 6 months I have been running it at the 7 psi.
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Old 04-26-2005, 11:04 AM   #5
Jaxx
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a few runs with an EGT probe or a wide band would provide you a much better answer


did they put the wide band on when you made your dyno run?
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Old 04-26-2005, 11:07 AM   #6
reddevil
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1990 Legacy wagon
goes 12.387 @ 116.5

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no. cause the dyno run was "free" and I didnt want to ask to much.
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Old 04-26-2005, 05:05 PM   #7
bboy
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04 Improved STI
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Agree with the others, you don't know that you are "running fine". You need data, then I'll bet you'll need EM.
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