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Old 06-10-2013, 04:39 PM   #251
stephenellis
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Apologies for reviving an old thread etc. But I've read on earlier pages (couldnt be arsed reading all 25) that installing an uprated filter/intake can make the car run 'lean'

This is a noob question, I know but I'm still learning so can any one define that for me please?

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Old 06-16-2013, 12:22 PM   #252
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I too, am a noob and just read all 25 (now 26) pages.

From what I understand, running "lean" deals with your Mass Air filter or MAS. A MAS gauges how much air is going into the engine and subsiquently adjusts the fuel injection levels to match it for optimum performance.

By understanding what the MAS does, I would assume that running lean means that the computer isnt synced properly and doesn't pump enough gas into the engine. This can be avoided by resetting the ECU (unplug the Black NEG line form the engine and leave it for 5 mins) but the better option is to get it tuned.

Correct me if I am wrong anyone.
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Old 06-16-2013, 12:24 PM   #253
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The maf will only 'adjust itself' so far....then a tune is needed.
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Old 06-16-2013, 12:36 PM   #254
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Thanks. Good to know.
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Old 06-16-2013, 05:46 PM   #255
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I see so its pointless getting an uprated intake without a tune. Pity tunes are bloidy expensive in the uk or wherever ive loojed they are...

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Old 06-17-2013, 11:39 AM   #256
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Quote:
Originally Posted by stephenellis View Post
I see so its pointless getting an uprated intake without a tune. Pity tunes are bloidy expensive in the uk or wherever ive loojed they are...

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A sri or cai does make a difference w/o a reflash.
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Old 06-17-2013, 04:39 PM   #257
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Its a 1.6 focus sport, European model. I doubt it is sri or cai.

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Old 07-28-2013, 03:08 AM   #258
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K&N with a Focus 2007

Hello Gents,

Looking to pick up a CAI next week and read through the thread completely a second time (cause im a noob). Heres my one question.

I see alot of people have gone with the K&N 2nd Gen of the 57 series. Located here: http://www.knfilters.com/search/prod...id=525209&rw=1

However, whenever I try to search by car, all I get is a 57i series, located here: http://www.knfilters.com/search/prod...x?prod=57-0595

I wanted to know firstly, will a FIPK fit into a 2007? I have the Street appearance package if that makes a difference.

Secondly, has anyone has experience with the 57i series? Thoughts?
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Old 08-10-2013, 10:31 PM   #259
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so i just got this 05 focus with the non serviceable filter (which has not yet been replaced). it has 109,000 miles and i'm having trouble on certain uphill portions of my commute. when i'm on the gas, to get up the hill, my car would have trouble maintaining the power at around 3.5 thousand rpm. sometimes, the needle on the tach would actually start to go down. i was wondering if this was an air filter problem. i figured that while i'm at it, i might as well get a cai. does that sound about right?
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Old 08-11-2013, 10:19 AM   #260
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A plugged intake can cause major power loss. Get a cai. They are cheaper than the new filter.

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