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Old 16-02-2017, 08:49 PM
sus sus is offline
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Default performance air filter

k&n don't list them for 2012 C350cdi
does anyone know if they are the same as 2010 C320cdi as they list them for that
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  #2  
Old 16-02-2017, 08:59 PM
LostKiwi LostKiwi is offline
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What's wrong with standard ones?
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Old 16-02-2017, 09:23 PM
EmilysDad EmilysDad is offline
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Save your money 'performance' filters are generally no bettervthan OE, they just make more noise ...... the placebo effect
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Old 16-02-2017, 09:59 PM
om613 om613 is offline
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Quote:
Originally Posted by LostKiwi View Post
What's wrong with standard ones?
They don't come with a 'performance' sticker.
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Old 16-02-2017, 10:01 PM
LostKiwi LostKiwi is offline
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Quote:
Originally Posted by om613 View Post
They don't come with a 'performance' sticker.
It's about the only think that's performance about them....
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Old 16-02-2017, 10:17 PM
sus sus is offline
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To see how well cars respond when the standard filter is replaced by a sports set-up, we took a Vauxhall Signum 1.9 CDTI diesel and a VW Golf GTI to tuning specialist Regal Autosport in Southampton.

Here, we hooked the models up to a rolling road and logged power data with a standard element in place, then with a sports filter and a full induction kit. We used K&N sports filters (48) on both cars, a K&N Apollo induction kit (190) on the Signum and an Evolution V-Flow (249) on the Golf.

Vauxhall Signum CDTI
Standard*/Sports filter/Induction kit: 150bhp/152bhp/156bhp

VW Golf GTI
Standard*/Sports filter/Induction kit: 218bhp/219bhp/224.5bhp
THIS IS FROM AUTO EXPRESS

Last edited by sus; 16-02-2017 at 10:18 PM. Reason: add text
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Old 16-02-2017, 10:22 PM
LostKiwi LostKiwi is offline
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OK so 152 hp against 150.
Statistically that's about 1.25%. That's within the realms of error from temperature changes and would not be felt by the driver. Even the induction kit wouldn't be felt. It takes a good driver to detect a 10% improvement 15hp on the first car and 21hp on the golf.
A remap on both would give far better results and more HP/ .

And that's before we take into account wear caused by inferior filtering and shortened engine life or potential oil contamination of the MAF.

Last edited by LostKiwi; 16-02-2017 at 10:23 PM.
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  #8  
Old 16-02-2017, 10:36 PM
Crash1 Crash1 is offline
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1 bhp and more crap in the engine
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Old 16-02-2017, 10:49 PM
sus sus is offline
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cars already mapped,just thought id put k&n in as you can clean and re-oil so no need to buy filters again
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  #10  
Old 17-02-2017, 06:10 AM
Craiglxviii Craiglxviii is online now
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Quote:
Originally Posted by sus View Post
cars already mapped,just thought id put k&n in as you can clean and re-oil so no need to buy filters again
Sus,

I work in automotive design and benchmarking. We test these things regularly. K&N filters make zero, say again zero impact on engine power. We have tested on dozens of cars over a decade and found no effect whatsoever. Put bluntly the OEMs are better and have more experience and money to spend on developing intrinsically-safe engine parts than aftermarket companies do.

What they do do however is contribute significantly to particulate buildup and associated wear patterns in the intake...
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