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Old 07-05-2011, 10:25 AM   #21
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Quote:
Originally Posted by vmaxbaby View Post
Will the computer learn the air ratio? With my 03 focus I did airbox and cat back the same time. When I started it for the first time the car idled at 3K rpm..I was thinking shit I screwed somwthing up. Then after about a minute the idle started dropping down and down until it was at normal idle. Waiting a minute turned off the car started it backup and went right to the correct idle. Did not retune and drove it 7 years that way until I sold it to buy the 2012. Was hoping it would work the same?
To a point yes the Focus ECU will learn, the problem is the ECU will only make changes to the fuel in closed loop , closed loop is the fueling done at idle cruise and part throttle , closed loop on the 03 Focus can adjust fueling by 25% +/- either direction. The problem is in open loop fuel nothing gets adjusted so lets say your running 8-10 % lean and the ECU adjust this in closed loop fueling when you go to open loop fueling (wide open throttle) there is nothing to adjust the fuel and you will run 8-10% lean

You have to ask your self if you had a tune how much better would those mods of been and how much safer would the engine have been

When you add mods 95% do it for better performance if you add mods and have no idea if your rich or lean you could be hurting the mods and loosing power from them

Yes I know some one is thinking I did mods and it felt great with no tune , the butt dyno lies because it comes from the same place that just added the mods so it thinks better gains , How much better would it be knowing its right and actually making that power


Tom
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Old 07-05-2011, 11:33 AM   #22
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I agree 100% with your statments, and know nothing about the closed loop or open loop but it sounds solid. On my mustang I did do a tune when I changed my intake, in fact everytime I did something I changed my tune so it would make the same sense to do it to this vehicle.
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Old 07-18-2011, 12:49 AM   #23
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I added to K&N Filter today and left the top of the box off......noticed it was louder for sure. A little to loud for my taste so I put the box top back on. I'll let everyone know if my mileage picks up.
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Old 07-18-2011, 10:59 AM   #24
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just noticed the coors light nice haha
glad to see someones already pulling apart the car hope some mods come out soon but i wouldnt be suprised if alot of companies are waiting for the st for a mod platform
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Old 07-18-2011, 05:38 PM   #25
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Would be really interested if someone were to throw a K&N cone-type filter on that 2.5" intake tube. Seems almost too easy to me. I'd also be really interested if anyone has time to post a video or sound recording with the cut-off top method.

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Old 07-22-2011, 11:16 AM   #26
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http://www.racinglab.com/weapon-r-in...focus-010.html

i'm considering giving this a shot. However, this thread (http://www.focusfanatics.com/forum/s....php?p=3658500) seems to suggest waiting for an FSWerks or AEM.

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Old 07-22-2011, 10:10 PM   #27
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http://www.racinglab.com/weapon-r-in...focus-010.html

i'm considering giving this a shot. However, this thread (http://www.focusfanatics.com/forum/s....php?p=3658500) seems to suggest waiting for an FSWerks or AEM.
Excellent. Thanks for the info!

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Old 08-28-2011, 08:20 PM   #28
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Originally Posted by immaengineer View Post
Definitley correct, I'm an engineer with aerodynamics experience... I'm working on an air box right now. Hope to have something designed by the end of the week once I get a chance to get a good look under the hood.
Did you ever get a chance to make mod the air box?
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Old 08-31-2011, 10:49 AM   #29
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Did you ever get a chance to make mod the air box?
I designed a box based on CAI that have been coming out for the Fiesta and a tube that goes from the front of the car to act like a ram-air that connects to the system. I have been trying to wait for an easier, and cheaper alternative, but I think I'm going to go forward with my build since the aftermarket is a bit slow with parts...
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Old 09-11-2011, 11:08 AM   #30
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Sorry to resurrect a dead thread but i just couldn't help it after reading this. I haven't posted here in months, and the one time i came back i found something awesome! I like the note the engine in this car makes, however I have always wished it was louder since i bought the focus. I did not realize how much better fofo sounds just by taking that intake box off...my god its a night and day difference when you press the gas haha. ANYONE with this car, please do yourself a favor and just rip the top of the Air filter box off, and enjoy. Don't waste money on a stupid aftermarket one. You'll never get any realistic gains from an intake anyways (especially if you get caught in city stop-and-go traffic), and any difference between taking this box off vs. throwing $200 at an aftermarket one is negligible at best. Plus, this way you can still use the stock MAF and tube! Its a Ford Genuine Accessory
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