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Old 01-24-2005, 11:04 AM   #1
amelnikov
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2002 WRX Wgn 292whp
Alex Performance

Default STI Injectors with stock ECU vXXXXX

Hi guys. I know this has beat to death but I just had a bright idea and I wanted to run it by some of the brighter minds on this forum. Some years back there was a question raised in the Turbo-Dodge community if larger injectors could be run with stock ecu ( map based). Someone decided to try to run the larger injectors with higher scaling map. So he ran a 2.5 bar map instead of stock 2 bar with was just about the same difference in % as the bigger injectors compared to stock. the results were very good. So I'm thinking, what if we take the same idea and apply to our MAF tube. Have a tube made up that is larger then stock by the same amount as the STI injector are larger then stock. Would that work?
Any constuctive suggestions are welcome.

Alex...
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Old 01-24-2005, 11:32 AM   #2
fliz
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I'm going to guess no.

It would be nearly impossible to design a tube that flows the same percentage more air than the stock tube at all flow rates.

Just look at issues aftermarket intakes have trying to match flow rates with the stock intake using the same diameter piping.

But, would it be possible to alter the MAF output electronically to make it read lower?
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Old 01-24-2005, 07:03 PM   #3
driggity
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There's also the issue that the ECU uses the MAF sensor for other things such as timing. If you're running a larger MAF tube the ECU will think that you're under less load than you actually are and will not run the appropriate timing. There was a thread about this in the 2.5L forum talking about the Perrin BigMAF and Perrin modified injectors. Plus engine management is a good thing.
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Old 01-25-2005, 09:36 AM   #4
beefyib123
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in theory it would work. if you could add just the right % of air to match the fuel. i maybe wrong but i am not sure if the throttle body would flow that much air.

Interisting idea but not one that would work without FAR more effort than it would be worth
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Old 01-26-2005, 09:25 PM   #5
amelnikov
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Alex Performance

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So basically a S-AFC with linear curve.
That's whay I was thinking as far as timing goes. Though it would be interesting to see how much the timing is affected. And why wouldn't the trottle body flow the air? It does just fine for everyone with big MAF tubes. I'll have to check the 2.5L forum to see if anyone has actually tried this. It would be intersting to see what Clark and Gorge think about this...
Thanks guys.

Alex...
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