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Old 01-08-2021, 10:41 AM   #161
Ron Middleton
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Default Re: Not for Nuthin' But Close!

For what it's worth I just purchased a 2004 Sunfire 2.2L to attempt to do like Billy. Wish I had his experience and I wouldn't be so uncertain about my abilities to make it run that well. We'll see how this goes but it looks like fun.
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Old 01-08-2021, 04:27 PM   #162
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For what it's worth I just purchased a 2004 Sunfire 2.2L to attempt to do like Billy. Wish I had his experience and I wouldn't be so uncertain about my abilities to make it run that well. We'll see how this goes but it looks like fun.
Good deal! Don't forget to do a "Build Thread" or add to this one!
BTW, buddy-up to a computer literate kid!!!
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Old 01-08-2021, 04:51 PM   #163
Ron Middleton
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BTW, buddy-up to a computer literate kid!!!

IO hope my 30 year old delivery guy here at the store is one. At least he seems to be but baby on the way not sure if his wife will give him enough space to get away to fool with this.
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#4892 J/SA. We are what we repeatedly do. Excellence then, is not an act, but a habit.”
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Old 01-08-2021, 04:53 PM   #164
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Good deal! Don't forget to do a "Build Thread" or add to this one!
BTW, buddy-up to a computer literate kid!!!
See Billy. I'm not even good with posting on this board by my previous post. LOL. I wanted to do the Neon thing but found the Sunfire first so here it goes.
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Old 01-15-2021, 07:51 AM   #165
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Fourth pass, Doug took out a bit more fuel, 15.158/89.57.
Fifth pass, took out a bit more fuel, 15.130/89.43.
Last pass, we charged the battery and got the car really cooled down. Doug also took out some more fuel and for the last pass of the year, 15.085/ 89.88!
So are you still running the car in Open Loop? Correct me if I am wrong, but this seems to be the simplest way to change the fuel tune, leaving out many other parameters in closed loop?
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Old 01-15-2021, 08:22 AM   #166
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So are you still running the car in Open Loop? Correct me if I am wrong, but this seems to be the simplest way to change the fuel tune, leaving out many other parameters in closed loop?
Yes open loop.
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Old 01-15-2021, 12:14 PM   #167
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Yes open loop.
Billy can you set the fuel/O2 and timing tables to be able to run in closed loop?
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Old 01-15-2021, 01:33 PM   #168
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Billy can you set the fuel/O2 and timing tables to be able to run in closed loop?
I would love to try it, but the issue is that there is no way to change what the desired O2 reading is. When it was in closed loop, it was commanding as rich as 11.8:1 by the end of the track, so it was decided that giving the tuner ultimate control was better than letting the ecu do its thing.
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Old 01-15-2021, 01:38 PM   #169
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So, if I set up to run Open loop, does it still adjust timing based on IAC and ECT but not oxygen?
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Old 01-15-2021, 01:45 PM   #170
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So, if I set up to run Open loop, does it still adjust timing based on IAC and ECT but not oxygen?
This car I was able to tune around any timing adjustments the computer tried to make. I set up the base spark table to a point where as soon as you give it full throttle, it would be at 29 degrees. It also has a "minimum spark vs. rpm" table I was able to play with, and for the added "lockout" effect, I (riskily) disabled the knock retard.
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