Interesting fueling issue with my tune. - The Saab Link Forums

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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 07-01-2008, 08:40 PM   #1
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Interesting fueling issue with my tune.

Hmm.


You would think a knock fuel enrichment map would ADD fuel, right?


Not the case.


Stock:


Knock:



Yay, less fuel. Oh, and the timing is the same too. Neato.

Big ups to JZW for telling me about this, and helping me figure out how to fix it.



Assuming you will never go off the fuel stock map is dumb, and that's what has happened here. Not too thrilled.
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Old 07-01-2008, 08:46 PM   #2
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How the hell does that happen? This means your car might just get a little faster right.
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Old 07-01-2008, 08:48 PM   #3
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Definately help the dyno #s
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Old 07-01-2008, 08:50 PM   #4
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Thats weird, though from what I have read you NEVER want to enter the Knock Fuel Map.

But you're right, it should add more fuel to cool the cylinders down. I think it even says that exact thing in the T5Suite pdf.
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Old 07-01-2008, 08:53 PM   #5
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Well, you don't want to enter it at all.

Assuming you won't is a bad idea. It's a bit different than a stock 9000 one, but not different enough.


As far as faster, maybe...I just don't want to blow anything up.
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Old 07-01-2008, 09:16 PM   #6
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What tune is this from? Pro or T5Suited?
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Old 07-01-2008, 09:18 PM   #7
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...pro.


As in the one that is running my car right now.
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Old 07-01-2008, 09:18 PM   #8
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thats his custom sqr b234r+gt3071 tune...
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Old 07-01-2008, 09:20 PM   #9
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Ok just checking..if it was a T5Suite I would hit up Guido to make some changes in the application.
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Old 07-01-2008, 09:43 PM   #10
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Thats really odd man. There has got to be some reason why Frank tuned the knock map that way. Have you looked at other fuel maps to see if they are heavily rich to do what the knock map would basically?

Jeeze the x-range is shorter by .48 on the negative end while the positive end isn't that far off, only .06.



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Old 07-02-2008, 05:15 AM   #11
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Maybe knock pulls boost?
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
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Old 07-02-2008, 05:21 AM   #12
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Maybe knock pulls boost?
yeah i would think if it detects knock it pulls boost thus pull fueling?



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Old 07-02-2008, 05:25 AM   #13
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That's a stock tune?! Wow!


...kidding.



If you look though, only a few values are Knock Map < Main Fuel Map, most of them the knock is greater than the main fuel map.

If you have t5 check for anomolies it should give you a nice report of all the ones that are less.
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Old 07-02-2008, 05:30 AM   #14
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It does a little bit. But not very much.

I'll post some more screen shots when I have time.
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Old 07-02-2008, 05:38 AM   #15
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So what's the next step here?
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Old 07-02-2008, 05:47 AM   #16
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is there a boost map related to knock?



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Old 07-02-2008, 05:58 AM   #17
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i can't see pictures, but this makes me want to get my SQR map pulled up that much more
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Old 07-02-2008, 06:00 AM   #18
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I'm going to load it into t5 suite, and add 2's to where its not correct, and then eventually re-flash the ecu. (along with some other stuff I have changed)


I have the Sqr tune saved in 4 places I can go back to that of need be.
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Old 07-02-2008, 07:32 AM   #19
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Is there a boost request and timing map for knock or does it just pull values off the fuel maps and compinsate for it? if theres seprit mabs then this map doesnt seem too off... what the stock one look like?
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Old 07-02-2008, 08:03 AM   #20
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How the hell does that happen? This means your car might just get a little faster right.
Yup faster right before it pings and cracks a piston

John
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