Aftermarket exhaust, and cold air kit; any difference in MPG? - Mercedes Benz SLK Forum

Performance MODS for the R170 Tuning and Performance modifications for your SLK

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#1 Old 07-01-2010
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Aftermarket exhaust, and cold air kit; any difference in MPG?

For those that have done the basic aftermarket cold air kit, and exchanged the factory exhaust with an aftermarket one, did you notice any difference in your fuel economy?

Is there any other aftermarket items that will help fuel economy?
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#2 Old 07-01-2010
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Quote:
Originally Posted by CALL911 View Post
Is there any other aftermarket items that will help fuel economy?
The SLK's a sports car , aftermarket exhausts & cold air kits for sports cars are to designed to produce more power not increase fuel economy .
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#3 Old 07-01-2010
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They're a waste of money all around and "better fuel economy" isn't much of a rationalization for purchasing them. No "guilt" pass.

It's not like Mercedes are poorly engineered and some guy in his garage can engineer improvements that are cheap.

But, folks are still talking about "cold fusion."

PS: The only "aftermarket" thing I can think of that would improve fuel economy would be to fit OE size tires if you currently have oversize tires.
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#4 Old 07-01-2010
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Quote:
Originally Posted by CALL911 View Post
Is there any other aftermarket items that will help fuel economy?
To increase fuel economy AND improve performance decrease vehicle weight, especially rotating mass:

Lighter wheels, lighter tires, lighter rotors (and lighter rotor hats with 2 piece rotors) are ways to decrease rotating mass. Possibly find a lighter drive shaft.

Other weight reduction could come from lighter battery,lighter seats and suspension parts. And if you are brave and have AAA or equivalent, remove your spare tire/jack/air compressor.


Everyday things you can do to improve mpg. Check and maintain tire pressure at specifications or even slightly higher (I wouldn't exceed 40 psi cold). Make sure your air filter is clean! (I won't restart the debate on K&N and green air filters; vs OEM paper filters ). Put the top up (in advance) for driving 50 mph plus...although this negates some of the fun of having an SLK.

Oh...I dont think an after market exhaust will do much for fuel economy UNLESS it is noticably lighter than the stock exhaust
probably others, but thats my off the top of head thoughts
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#5 Old 07-01-2010
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I don't want to start a debate either, but I'm convinced my K&N air filter has allowed me to get 30 mpg when my foot isn't in the throttlebody.

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'00 SLK230 Designo C_opper (2 of 26 - Yes, I have 2 of the 26...interesting story), '17 Hyundai Santa Fe Sport 2.0T Ultimate, Cessna 172/182 (pilot)


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#6 Old 07-03-2010
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With all my mods.. I get about 19-20mpg in my SLK230.. then again.. the performance i've gained, makes up for it.

And for the RECORD. once you start to ACTUALLY modify your SLk230, intake/exhaust work DOES matter. Just saying, i've proved it in real world driving (aka racing.. yes.. on streets)
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#7 Old 07-08-2010
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Smile MPG questions

Hi guys,

My 99 SLK has the standard engine, and the 17" tires and I get in the city 22-24 MPG and then on long interstate trips, it'll give me 28-30 MPG.

Some earlier mentioned lowering the car, I have thought about that, and I see the lowering spring sets on eBay, does it do anything better for the car, other than looking cooler?

Eddie
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#8 Old 07-08-2010
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You should be able to corner quicker ,but you will probably find the ride harsher & feel more of the imperfections in the roads .
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#9 Old 07-09-2010
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Thanks for all the inputs. I started this thread really just wondering, as I have owned sports cars before (and currently) and after a simple aftermarket exhaust and some form of cold air kit, or even just swapping the factory air filter for a K&N air filter I have noticed BOTH an increase in power and fuel economy due to the less restrictive exhaust and air filter. But I didn't know if similar results could be found in a car like this. The previous sports cars were the standard 3500 lbs, and had V8's under the hood.
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#10 Old 07-09-2010
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Thanks for the info. I do enjoy the ride of the SLK, it is not really the "hard core sports ride", more of a "gentlemans sports car" kind of a ride.
Decisions, decisions
thanks,
Eddie
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#11 Old 07-09-2010
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Quote:
Originally Posted by CALL911 View Post
some form of cold air kit,
the stock MB intake is a cold air intake kit, with the added benefit of 'Ram induction'. It can be improved, but not with some generic Ebay POS.


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