- #58 of 77
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Re: Lifter noise solved [jkloss]
by smartcpa
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Apr 03, 2009 (3:36 pm)
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Replying to: jkloss (Apr 03, 2009 7:15 am)
The only notation I see on my invoice is that they "sent PUMA Case in for Cyl. Head." The repair notation said PUMA 22345808, My complaint was that the engine made a loud tapping noise when idling. They tried their quick fix of bleeding the lifters, that worked for about 2 months, then the noise came back. Hope this helps. The engine runs quiet and smooth now.
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- #59 of 77
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Re: Has anyone had engine problems with their 2007 525 or 530? [loulou2]
by mobiusf1
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Apr 03, 2009 (4:11 pm)
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Replying to: loulou2 (Mar 25, 2008 8:32 pm)
Honestly, go to a different dealer if you can. I've been to terrible dealers and amazing dealers. I'm sure there is a dealer that will be able to help you out.
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- #60 of 77
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K&N
by galama
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Apr 06, 2009 (7:37 am)
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But don't you think I would get little extra power from K&N and better gas milege.
I do think that cold air intake would be stupit.
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- #61 of 77
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Re: K&N [galama]
by shipo
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Apr 06, 2009 (8:29 am)
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Replying to: galama (Apr 06, 2009 7:37 am)
Contrary to the marketing bilge that K&N would love for you to believe, it is a physical impossibility for your car to get better fuel economy with a K&N filter (or no filter at all for that matter). Why? Because your car (and pretty much ALL cars these days) measure the weight of the air entering the intake and then meters exactly the precise amount of fuel for that air. If, for the sake of argument, the K&N did allow more air in, the system would simply add more fuel and you'd have exactly the same fuel economy as if you had the stock paper filter in place (which provides much better filtration than a K&N), or no filter at all.
As for more power, highly-HIGHLY unlikely. The BMW engineers aren't fools; they know how to build an intake system that efficiently feeds air to the engine, regardless of the environment or how firmly planted the drivers' foot is to the floor.
Best regards,
Shipo
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- #62 of 77
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Re: K&N [galama]
by Mr_Shiftright HOST
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Apr 06, 2009 (9:18 am)
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Replying to: galama (Apr 06, 2009 7:37 am)
Nope you don't get more HP or better gas mileage from a K&N filter all by itself, or if the dyno or your fuel gauge suggested that there is an improvement, it is so small as to be statistically irrelevant (in other words, it's within normal variations).
I've tested these things many times and the best I can say is there is no gas mileage improvement that can be attributed to them, and as for "power", there might be better throttle response but no better 0-60 times, or again, so slight as to not justify the costs.
If you found a very restrictive air intake system (not a BMW) and a very large engine, you might register 3-4 more HP on a dyno.
My friends Porsche/Audi shop tested these on a dyno and got ZIP; however, in conjunction with well-engineered aftermarket exhaust systems, and changes to fuel-mapping, yeah, the K&N helped out.
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- #63 of 77
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Re: K&N [shipo]
by galama
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Apr 06, 2009 (10:40 am)
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Replying to: shipo (Apr 06, 2009 8:29 am)
wow i see now you are right, i did think that K&N provides better filtration but openings are bigger so how would that be possible. So is there anything that would be better besides stock as far as better milege and more power when it comes to air intake? well im ok with milege more power would not hurt. How about chip? does it hurt engine?
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- #64 of 77
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Re: K&N [galama]
by roadburner
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Apr 06, 2009 (5:43 pm)
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Replying to: galama (Apr 06, 2009 10:40 am)
Like Shipo said, BMW doesn't leave much on the table with regards to hidden horsepower- at least with respect to their naturally aspirated cars. You'd be very lucky to pick up 5-6 bhp from a CAI and a re-flash.
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- #65 of 77
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Re: K&N [galama]
by Mr_Shiftright HOST
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Apr 07, 2009 (11:43 am)
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Replying to: galama (Apr 06, 2009 10:40 am)
Yeah there are chips available that seem to work---but you have to really do your homework and get on the specialty BMW sites and see what chips DO WORK and which are all smoke and mirrors.
Also I like detailed info on the chip, so I know what they are manipulating in order to get the HP gains. Some chips do fuel enrichment, some boost timing, some just extend your automatic transmission shift points (don't need to spend $400 for THAT!).
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- #66 of 77
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Re: K&N [Mr_Shiftright]
by roadburner
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Apr 07, 2009 (2:13 pm)
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Replying to: Mr_Shiftright (Apr 07, 2009 11:43 am)
Steve Dinan and Jim Conforti are the top two players- in my opinion, anyway.
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- #67 of 77
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Re: Lifter noise solved [smartcpa]
by jkloss
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Apr 14, 2009 (4:05 am)
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Replying to: smartcpa (Apr 03, 2009 3:36 pm)
Just received word today that BMW will replace the cylinder head on my 07 535XI.
They claim this will solve the ticking problems. Get the car back next week. Will keep you informed as to whether this solves the problems.
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