LT1-LT4 Modifications 1993-97 Gen II Small Block V8

lets discuss DFCO

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Old 08-13-2011, 12:28 PM
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Default lets discuss DFCO

If your happy with your settings, can you inform me on how you have them set. I want it to shut down a little better, seems its pushing to much My timing is going to the commanded closed tps timing but for some reason seems it's not cutting fuel. I might just have the complete wrong idea of what this is for.
Old 08-13-2011, 03:25 PM
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DFCO only really works at higher speeds and higher rpms.

Good luck getting DFCO help. I've had to do trial and error on the little I did before summer.
Old 08-13-2011, 03:46 PM
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To be able to set it properly you need to do a few test. And.be able to log your vehicle. First is you need to find out what the highest vacuum you are pulling when you let off the throttle from a high rpm. You set your dfco to a little more than that. Then you need to find out what rpm you want it to stop the dfco. After that you test for the least vacuum at that rpm coming from wot or from the previous test. These are the values you will have to input/change in your tune.
Old 08-13-2011, 05:55 PM
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Ok, what I'm looking for, I was thinking I could have it working at say 20-50mph and basically cutting all fuel since I have a m6.
Old 08-13-2011, 08:56 PM
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That's very aggressive. If you have it too aggressive that just means after coasting a bit, you'll need more gas to speed back up and will actually hinder mileage... If mpg is your thought process.
Old 08-14-2011, 11:21 AM
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Really its a rpm based thing. I tend to stop dfco at about 1300 to 1500 depending on a few factors. If you go too low you can make it stall out. Which isn't a good thing.



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