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Old 11-06-2009, 05:52 PM   #1
tehknikhal
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Cool 09 WRX stock intake/maf sensor Question

If I swap the MAF tubing from the stock intake into an aftermarket one does it change anything? Will it throw on a CEL? Also if I get a drop in filter, will resetting the ECU be fine without any unseen/seen problems for the 09 WRX? Also, dont bash me because I did read the Intake FAQ and some of the questions like this haven't been answered unless I missed something on that thread. Sick of random people bashing on the Newbies/Faq thread.
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Old 11-06-2009, 05:55 PM   #2
the suicidal eggroll
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Stock intake to aftermarket intake will alter the air flow pattern, changing the required MAF scaling. Most intakes are close enough where you can get by without a retune, but some aren't and your AFR will be off. Off enough to throw a CEL? Doubtful. Off enough to lean out the car to the point of detonation? Maybe. It's always a good idea to check it with a wideband or get a tune to suit your specific car.

Drop-in filter won't affect anything.
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Old 11-06-2009, 06:03 PM   #3
tehknikhal
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Stock intake to aftermarket intake will alter the air flow pattern, changing the required MAF scaling. Most intakes are close enough where you can get by without a retune, but some aren't and your AFR will be off. Off enough to throw a CEL? Doubtful. Off enough to lean out the car to the point of detonation? Maybe. It's always a good idea to check it with a wideband or get a tune to suit your specific car.

Drop-in filter won't affect anything.
Sorry I don't think I made my question specific enough
meant to say keep the stock intake box and just change the tubing that goes into the intake manifold or whatever. Was wondering if they would do anythin.

Heard that if I don't get the drop-in filter tuned or something the car might drive too lean or something. Just wondering. But thanks for the input.
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Old 11-07-2009, 10:42 PM   #4
the suicidal eggroll
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Originally Posted by tehknikhal View Post
Sorry I don't think I made my question specific enough
meant to say keep the stock intake box and just change the tubing that goes into the intake manifold or whatever. Was wondering if they would do anythin.

Heard that if I don't get the drop-in filter tuned or something the car might drive too lean or something. Just wondering. But thanks for the input.
Erm...there is no tube that goes to the intake manifold...the intercooler mounts right on the manifold. Are you talking about replacing the turbo inlet?
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Old 11-08-2009, 09:56 AM   #5
Ric WRX
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I think he is talking about after MAF tube that Perrin sells. I have one. I don't know if it does anything.
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Old 11-08-2009, 12:11 PM   #6
tehknikhal
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Erm...there is no tube that goes to the intake manifold...the intercooler mounts right on the manifold. Are you talking about replacing the turbo inlet?
yeah, what about changing that and I'm also talking about the Perrin hose that they sell for the MAF.
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