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Old 3rd February 2006, 00:11   #41
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I don't know but anytime I've made the intake on a car significantly less restrictive you could always hear a difference.
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Old 3rd February 2006, 00:12   #42
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Quote:
Originally Posted by MEnthusiast
How much intake sound will you hear from the interior of a fairly isolated sedan?
Particularly when the filter was removed from an (almost) enclosed case. If the whole box were replaced with cone style filters, then I would see that the noise increase would be more noticeable.
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Old 3rd February 2006, 01:00   #43
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Well, I have been driving around all day today, doing my normal routines, and I can again vouch that my car does feel more responsive and has significantly more pep than it did yesterday.

As far as the intake sound, I really don't know what to listen for there. My cars have always made outtake sounds, ie, exhaust. I guess my ear is not trained to listen to my intake.

I will say I heard a slight whirring noise today, but don't know if that is a sound that has always been there that I didn't pick up until today, or if that might be the intake noise you are referring to? And hopefully not my rear diff! I think the noise has always been there though.

Back to a question I posted earlier: If even the slightest bit of plastic shaving debris gets sucked into the engine, do I have anything to worry about? Or will it just get cooked away. How big a piece of something can get sucked into the engine without damage being caused?
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Old 3rd February 2006, 01:05   #44
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Quote:
Originally Posted by MEnthusiast
The ECU will also take several miles to readjust for the more air so the effect may get better with time. I forget how many miles/ time is needed.

What crossed my mind was reports of cars in Europe being Dynoed at around 530bhp. If these filters take about 5% performance away you get close to the rated 507bhp. (its about 4.3% difference). Is it possible that the engine is stronger from the factory knowing the US cars should meet their rated power output? The flip side of this is- can you feel a 5 or even 10% difference in power? I think it would be subtle as many here have described. Still this is interesting.
I agree. What is odd is after I removed the filters, 15 minutes into my ride I got a message on my screen that something like, "transmission error, please drive moderately". I stopped. turned the car off for a couple minutes and then it went away....very strange.
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Old 3rd February 2006, 01:14   #45
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Coincidence I hope. I haven't hadn't any error messages yet. But the tranny has no relation to anything we would have touched with the air filter housing areas, so it probably just is coincidence.

Quote:
Originally Posted by 6speed
I agree. What is odd is after I removed the filters, 15 minutes into my ride I got a message on my screen that something like, "transmission error, please drive moderately". I stopped. turned the car off for a couple minutes and then it went away....very strange.
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Old 3rd February 2006, 02:43   #46
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I believe that tranny error is a result of some bad software and there is a patch out- I think theres a sticky on it.
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Old 3rd February 2006, 02:59   #47
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Brilliant.

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Old 3rd February 2006, 03:07   #48
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Quote:
Originally Posted by MJ
Brilliant.

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So did you do it and did you feel a difference?
I hope it does not take away from the exhaust burble on throttle-off, any comments?
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Old 3rd February 2006, 03:40   #49
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Quote:
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So did you do it and did you feel a difference?
I hope it does not take away from the exhaust burble on throttle-off, any comments?
OK, just took mine off in less than 15 minutes; could not take either 2ndary filters without breaking their plastic frame, the metal clips stayed on and had to be pried separately. All other pieces intact...Going for a drive will report back in 30 minutes (unless i it a tree or something...j/k)...
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Old 3rd February 2006, 04:10   #50
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I wouldn't worry about it.

Quote:
Originally Posted by LJM5
...Back to a question I posted earlier: If even the slightest bit of plastic shaving debris gets sucked into the engine, do I have anything to worry about? Or will it just get cooked away. How big a piece of something can get sucked into the engine without damage being caused?
Brian.

I wouldn’t worry about what would amount to no more than a small plastic shaving. It would be too small and too soft (as opposed to metal) to do any damage.

My first BMW, a 1967 1600 was at the body shop getting a complete re-paint (BMW was notorious for poor two stage metallic paints at the time) and the body shop guys didn’t know there was a manual choke on the left side of the steering column. They were having trouble starting the car so they took the top of the air cleaner off to pour gas directly down the carburetor and in the process dislodged the accelerator pump nozzle. It got sucked into the combustion chamber and being made of metal it did a number on the number three piston and exhaust valve but the cylinder was untouched. At that time all the parts were available from Hoffman Motors (the US BMW distributor before BMW NA) to overhaul any component on the car so over the weekend I did a complete engine overhaul of both the top end (valve job including rockers and shafts) and bottom end replacing all 4 pistons and rod and main bearings. I also did a gearbox overhaul being as it too had to come out when I removed the engine. Parts even 35 years ago were expensive (even at dealer cost) as the total for the parts alone was over $500.00 or close to months pay for a BMW parts counterman but I had the sweetest running '67 1600 in San Diego.
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