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Old 11-25-2013, 02:43 PM   #1
steezytype-s
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Member#: 240532
Join Date: Mar 2010
Chapter/Region: Tri-State
Location: South Jersey
Vehicle:
2002 WRX Sedan
PSM

Default Cruise control and MAF scaling?

Was wondering if anybody knew anything about using the cruise control while collecting data to rescale the MAF. I am aware that the stock ECU can't really keep up with quick throttle percentage changes, and as such, its better to use the throttle gently. (I ended up with a ton of bad data last time i tried to do this because i stupidly kept stabbing at the throttle )

So my question is, would it be preferential to get on a long road, set the cruise control, and never adjust the throttle ( or adjust as little as possible) until i have enough data to rescale? Any cons to doing this?


EDIT: using a brand new stock o2 sensor, no WB02 yet.
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Old 11-25-2013, 09:19 PM   #2
bluemax189
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2011 WRX
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cruise control holds a certain speed that you set. if you cant stop stabbing the throttle like you said, I doubt you have the patience to actually do a complete tune.
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Old 11-26-2013, 06:12 AM   #3
Drewswrx
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Quote:
Originally Posted by steezytype-s View Post
Was wondering if anybody knew anything about using the cruise control while collecting data to rescale the MAF. I am aware that the stock ECU can't really keep up with quick throttle percentage changes, and as such, its better to use the throttle gently. (I ended up with a ton of bad data last time i tried to do this because i stupidly kept stabbing at the throttle )

So my question is, would it be preferential to get on a long road, set the cruise control, and never adjust the throttle ( or adjust as little as possible) until i have enough data to rescale? Any cons to doing this?


EDIT: using a brand new stock o2 sensor, no WB02 yet.
You can use the CC to try and scale cetain points in the MAF scale and then interpolate btween those points. But dont try and hit each and every point. Leave cushions inbetween each data point to interpolate between. The only con is not finding a quiet and long enough straight road. Dont forget to use some hills to put load on the car as well. This is how I did about the first 50% of my scale it takes a long time and patience. I would also not recomend using your OEM O2 sensor to tune the car. It is not fast or accurate enough to get the car dialed in correctly. It is highly recomended using a Wideband just to be on the safer side. I hope this helps.
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Old 11-26-2013, 12:12 PM   #4
steezytype-s
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Member#: 240532
Join Date: Mar 2010
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Location: South Jersey
Vehicle:
2002 WRX Sedan
PSM

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Quote:
Originally Posted by Drewswrx View Post
You can use the CC to try and scale cetain points in the MAF scale and then interpolate btween those points. But dont try and hit each and every point. Leave cushions inbetween each data point to interpolate between. The only con is not finding a quiet and long enough straight road. Dont forget to use some hills to put load on the car as well. This is how I did about the first 50% of my scale it takes a long time and patience. I would also not recomend using your OEM O2 sensor to tune the car. It is not fast or accurate enough to get the car dialed in correctly. It is highly recomended using a Wideband just to be on the safer side. I hope this helps.
Cool, seems like it would just be better/smarter for me to grab a wideband before I start attempting this. I'm fortunate enough to have a 70+ mile expressway right near my house that i can (hopefully) cruise along to get some of my data. So, for now, i think maybe some book learnin' and WBo2 sensor buying is in my immediate future. Thanks again!
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