124 Performance Thread - Page 18 - Mercedes-Benz Forum
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post #171 of 181 (permalink) Old 04-02-2019, 01:50 PM
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I feel like the factory design could be very easily improved upon as it's really not that great (especially since factory designs are always about compromise, not about power), but there would be very little gains because that is not a limiting factor on this engine. I still need to poke around under the hood of this car when I have some time, but I'm guessing the cylinder head and intake manifold themselves are more limiting factors. And probably the factory cams, as this car was tuned to be comfortable, not fast. And from what I've read, the fuel injection system.

I'm so used to performance cars that it's a little strange to have a car where there's almost no realistic options for more power, other than going forced induction. But then again, this is a luxury car, not a performance car.
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post #172 of 181 (permalink) Old 04-02-2019, 02:03 PM
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Ram air is as good as you're going to find. Your car already has that from the factory

Air intakes should be as free flowing and short as possible. Check.

Air paths should be void of uncessary twists and bends. Your car's got it.

Air intake snorkels should be free of resonators and other power robbing rubbage. Ding, ding, ding.

Feel free to experiment, but ultimately you will find that there isn't really anything substantial to improve on over the stock gear.

The only possible improvement I can think of to improve the stock system is to eliminate the fog lights Dodge Hellcat style and force the air from that hole straight into the engine. And the improvement will be negligible at best.

If you're used to muscle cars, than these cars are pretty lame. I used to be the same many moons ago when I modded a 95 SVT Cobra from day 1 with delivery miles on the clock. I couldn't leave that thing alone until I had over 600 ponies on the dyno all the way back in 1996. The downside is how much money it took to get there.

These cars and European cars in general will blow a hole in your wallet if you're really intent on hopping up the power.
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post #173 of 181 (permalink) Old 04-03-2019, 12:32 AM
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I cut the big dustpan looking flap on the front of the intake duct that seems would be a blockage when you look straight at it. Not sure if there were any gains, but the price was right. The factory system is short and direct. All production cars have power compromises for longevity, mileage, driveability, etc, but that doesn't mean they're easily overcome with bolt-on mods.


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post #174 of 181 (permalink) Old 04-03-2019, 04:14 AM
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Originally Posted by sbaert View Post
Ram air is as good as you're going to find. Your car already has that from the factory

Air intakes should be as free flowing and short as possible. Check.

Air paths should be void of uncessary twists and bends. Your car's got it.

Air intake snorkels should be free of resonators and other power robbing rubbage. Ding, ding, ding.

Feel free to experiment, but ultimately you will find that there isn't really anything substantial to improve on over the stock gear.

The only possible improvement I can think of to improve the stock system is to eliminate the fog lights Dodge Hellcat style and force the air from that hole straight into the engine. And the improvement will be negligible at best.

If you're used to muscle cars, than these cars are pretty lame. I used to be the same many moons ago when I modded a 95 SVT Cobra from day 1 with delivery miles on the clock. I couldn't leave that thing alone until I had over 600 ponies on the dyno all the way back in 1996. The downside is how much money it took to get there.

These cars and European cars in general will blow a hole in your wallet if you're really intent on hopping up the power.
As far as German cars go I'm also more used to BMW, which seems to be equally expensive but more "mod friendly." All of my past BMWs were tastefully modded with a slew of things. Except my M5, because companies tried to charge prices like $5 grand for a set of headers. That was ridiculous.

Keeping on the topic of performance; since we can't get much out of the engine, there's other ways to make these cars a bit peppier. I rarely see lightweight rims discussed; most people tend to go for the AMG wheels, which I'll admit look nice. Are there any in particular that are lighter weight? Or has anyone installed a set of very lightweight aftermarket wheels and noticed much of a difference?

Are there any transmission upgrades available for us? Anything such as a shift kit, or is the only option to replace the transmission with something better?
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post #175 of 181 (permalink) Old 04-03-2019, 04:15 AM
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Originally Posted by partnumber187 View Post
I cut the big dustpan looking flap on the front of the intake duct that seems would be a blockage when you look straight at it. Not sure if there were any gains, but the price was right. The factory system is short and direct. All production cars have power compromises for longevity, mileage, driveability, etc, but that doesn't mean they're easily overcome with bolt-on mods.

I remember reading where you did that. Seems like it might help a bit at speed. These engines don't seem too hungry though, which I believe is the main issue. They're just very mild engines, albeit with some decent compression ratios to boost power.
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post #176 of 181 (permalink) Old 04-03-2019, 11:25 AM
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Have a look at this thread where I got the idea to mod the intake duct. I'm skeptical he dropped 1sec from 1/4mi ETs, but whatever.

M104 performance from an M103! (Information given not questions asked!) - PeachParts Mercedes-Benz Forum

You can adjust the trans for higher shift points and firmer shifts. I would go for a manual swap.

722.3 and 722.416 series transmission adjustments
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post #177 of 181 (permalink) Old 04-03-2019, 10:56 PM
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from what all I understand, the manuals on the W124's were pretty pedestrian. long throw slow shifting, wide gear spacing.


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post #178 of 181 (permalink) Old 04-03-2019, 11:01 PM
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from what all I understand, the manuals on the W124's were pretty pedestrian. long throw slow shifting, wide gear spacing.
Perhaps, but compared to what? 722.4 is hardly a Porsche PDK and prone to failure as well.

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post #179 of 181 (permalink) Old 05-27-2019, 08:40 PM
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Wow, this mod really gets me, If anyone can get dyno results before and after I would be glad. I feel like Mercedes knew what they were doing when they designed the intake. This looks like a fun thing to do, but I don't think it would make a difference until you get your engine tuned to use that extra air to its advantage right?
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post #180 of 181 (permalink) Old 05-28-2019, 12:27 AM
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from what all I understand, the manuals on the W124's were pretty pedestrian. long throw slow shifting, wide gear spacing.
Try driving one with delrin shifter bushings instead of 30 year old rubber bushings. Smooth throws, positive engagement, perfect spacing for quick shifts.

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