Found out why my engine was down on power. You gotta see this.
#1
Rennlist Member
Thread Starter
Found out why my engine was down on power. You gotta see this.
So my car has seemed lethargic lately, and even my mechanic mentioned it. So after analyzing a LOT of logged data from track events, I determined that my car had lost 15 rwhp this year over last year. Obviously I was really worried...until I saw this today:
DOH!! I've been running like this all summer.
And in case you're still wondering why that's a big problem:
I don't know if I should blame the Porsche air filter that it collapsed or the Fabspeed airbox cover, but at any rate, the K&N filter went back in. Unbelievable.
I went for a test drive, and yup, definitely a difference. Kinda surprised you could so easily notice a 15 rwhp loss.
DOH!! I've been running like this all summer.
And in case you're still wondering why that's a big problem:
I don't know if I should blame the Porsche air filter that it collapsed or the Fabspeed airbox cover, but at any rate, the K&N filter went back in. Unbelievable.
I went for a test drive, and yup, definitely a difference. Kinda surprised you could so easily notice a 15 rwhp loss.
#3
Three Wheelin'
Looks to me like the filter got sucked into the intake tube and restricted airflow. Not sure if having the rest of an airbox cover would have prevented it from getting sucked in there like that. Is there anything else modified on your car that would significantly increase the suction at the intake?
How come you didn't notice this when you were checking your oil level? You DO check your oil level now and again don't you?
How come you didn't notice this when you were checking your oil level? You DO check your oil level now and again don't you?
#4
Rennlist Member
Thread Starter
A friend of mine just found the same problem in his R32 this week. There the ECU backed off the boost at 5800 rpm and so he got no boost above that. He fixed the air filter and it solved the problem.
#5
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#6
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Does the Fabspeed airbox cover lock down all the edges of the filter? I guess what I am trying to understand is how the filter got loose to begin with.
Did you notice the power difference when you removed the filter?
Cheers,
Mike
Did you notice the power difference when you removed the filter?
Cheers,
Mike
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#8
Rennlist Member
Thread Starter
I don't know if the factory airbox would prevent this. I thought I've heard that maybe the felt air filter rim is a recent change (?). So I wonder if this was an isolated incident.
#9
I never had a problem with the factory air box cover... my guess would be that the custom air box cover is not holding the upper right air filter securely enough.
George
#10
Drifting
Did you ever drive the car in REALLY rainy or wet conditions? Or give the thing a REALLY thorough bath? If so, your filter likely got soaked and subsequently SUCKED into the intake.
#11
Race Car
to me, it looks like its time to Drill the filter, and screw it to the airbox....
what kind of exaust?
your filter likely got soaked and subsequently SUCKED into the intake.
^
yep, that would do it too...
what kind of exaust?
your filter likely got soaked and subsequently SUCKED into the intake.
^
yep, that would do it too...
#12
Technical Guru
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#13
Seared
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#14
#15
RL Technical Advisor
I'm willing to bet money that it was the POS ill-fitting fabspeed airbox cover. Their equivalent for the 964 (I've seen on it on several now) has similar problems that cause another set of issues that are really only noticeable with the engine out (unfiltered air).
I think Jason is onto something here,....
For the past 12 years and better than a hundred cars, we have used the stock aircleaner cover and carefully cut away most of the center, leaving a rigid frame (using OEM paper element, of course) with no issues whatsoever.
JMHO, of course.