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Discussion Starter · #1 ·
hey guys, im picking up an 05 wrx next week that i checked out and liked a lot. It had catless up and down pipes and a 3 in catback exhaust. and a cold air intake. when i took it on the highway i was getting 10-11psi of boost. I have a tactrix cable and im familiar with mapping from my 02 wrx i had last year. starting out fresh again with my new 05 can some guys here give me tips on what to tune for this? i want a target boost of 14psi. thanks for any help. oh ya and im only able to get 91 oct where i live.
 

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someone at least please advise me on what to do about the cold air intake. theres no wideband o2 so i cant scale OL fueling myself. what should i do about that part?

You have two options, more or less. Option one would be to return the car to stock. Option two would be to pay a professional to tune the car.. you could attempt tuning the car yourself, but as you already stated, you don't have access the required equipment to properly tune the car yourself.. or the knowledge and experience to do it well without destroying the engine.
 

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Discussion Starter · #4 ·
Thats unfortunate. What are some indicators i can look for in my logs to make sure im running safe with the CAI? Also i noticed most professional etuners dont require a wideband o2 sensor when etuning a car, how can they do it?

Also is it possible to use someone elses maf scale that has a similar intake on the same car?
 

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Thats unfortunate. What are some indicators i can look for in my logs to make sure im running safe with the CAI? Also i noticed most professional etuners dont require a wideband o2 sensor when etuning a car, how can they do it?

Also is it possible to use someone elses maf scale that has a similar intake on the same car?
They've tuned enough vehicles to have a MAF scaling that works, and they typically tune OLF table on the richer side, so even if the scaling is off a bit, it's not going to lean out too much under high RPM/load.

If you can find MAF scaling from someone else, you could use that and be better off than OE scaling (assuming it was scaled properly). However, you need to know/trust the source, as it has a direct impact on your fueling.

There are variances that will come into play. You won't have a perfect scaling using one off the Internet, but you can get pretty close. Personally, I would tell you to spend the $150 or so and buy an AEM UEGO and just do it properly (that's a handful, or less, of nights out with your buddies you have to pass on). You'll have a better running car, and the gauge can help notify you of issues that could cause catastrophic engine failure if not detected.
 
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