2nd Generation Specific 1986-1992 Discussion


Old 03-16-2004, 05:45 AM
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Thinking of putting a K&N box filter in my TII. Any benefits or draw backs? Does it increase boost, or cause the engine to run leaner?

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Old 03-16-2004, 07:56 AM
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I did not notice any difference when I swapped the stock element for a K&N drop in element for the stock airbox. I suspect it improved airflow a little, but not enough to affect your car's ability to cope with it, IMO.

Now removing the stock airbox and putting on a K&N cone filter, that's a whole 'nother ball game. No other single mod I've done so far had anywhere near the impact of getting that airbox off. I suspect you'd need at least a FCD if you went that route, and you'd better keep an eye on your A/F ratio.
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Old 03-16-2004, 10:31 AM
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if u go witha drop in k&n you should gain about .5 psi more on an otherwise completely stock car. that is what myfriend have gotten on his s4. thought he said it wasnt really a noticeble gain.

if you decide to go with a cone style intake get the fcd since you will be hitting fuel/boost cut.
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Old 03-16-2004, 10:40 AM
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performance gains aside, a k&n is a good thing because you don't have to keep buying filters, you can just clean and replace it
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Old 03-24-2004, 02:03 PM
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I picked up a used one from ebay (fipk) and installed it in about an hour, my car was hell to start right after i got it on, I think some of the cleaning solution was still in the filter, and my exhaust popped a few times (just like a few puffing sounds followed by a doughnut of exhaust gasses), now it runs fine, no more popping, I can hear a little bit of a difference beneath the hood, but I imagine I need to fabricate a heat shield before I'll notice any real differences. It does seem to pull a little bit stronger up hills than it used too, but I'm still drag limited at 110. :P
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Old 03-24-2004, 03:22 PM
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Get a cone filter. Effects of the cone filter: You might notice a small difference in power, but most likely not, you will hear your turbo spool a lot louder, and thats about it. You wont even be close to fuel cut. Now if you put a 3" downpipe and midpipe on then you would need the fcd. If your planning on increasing the power of the car by any significant amount, just start saving for a Haltech, It'll make everything a lot simpler in the long run. Stock ecu doesn't like much else but stock.
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Old 03-24-2004, 03:46 PM
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Can someone fill me in on what the FCD is?
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Old 03-24-2004, 08:08 PM
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keeps the computer from cutting the fuel from the motor at like what- 6.5 lbs? needed for anything thats gonna increase boost levels in the motor.
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Old 03-24-2004, 10:50 PM
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^ yup, fuel cut defender.
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Old 03-25-2004, 03:48 PM
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yea, getting a cone filter wont make much of a difference, it will just let your engine breathe alot easier.
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