Focus RS exhaust

ForYourOwnGood said:

Focus RS has the same sort of headifold we do, so I'm going to guess it has to do with the exhaust being a single pipe all the way back instead of splitting into two pipes before the axle.

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Blyman93 said:

My money is the turbo. It's a bigger turbo so it's deeper, a little more throaty. Check out vids of people with upgraded turbskies, their exhaust is much better than an equal exhaust on stock

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DontoMelbo said:

The RS appears to have an exhaust valve that actives, I'm guessing, at a certain rpm (1:50 of video below). I didn't know that. So it's a single exhaust until it opens then its a short dual from the muffler. That along with a much different exhaust config certainly will certainly change the sound characteristics.

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Glenn G said:

I think you are right, the FoRS is single all the way to the back where it has a Ginormous muffler that has a tip on either side. No other resonators in the system, Ford for some reason thought Mustang Drivers wouldn't like to hear turbo sounds and did their damnedest to try and make the EBM sound like an NA car and failed miserably. They wanted the FoRS to sound like the relatively large displacement (for a turbo 4) engine that we have and tuned cam timing the exhaust, intake and BOV accordingly.



That was a good guess but the turbos are identical on the exhaust side,

it is only just 2.4mm bigger on the compressor side which will not affect tone.

But you are absolutely correct all the big turbo EBMs typically sound better than stock turbo ones with the same exhaust system.

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Spykexx said:

I know one company came out with a single exhaust for the EB. Wonder how it would compare.

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Phil@JDM said:

The RS sounds different probably because it has a different head, different cams, different turbo, different exhaust with electric valve, etc. The only real similarity in the motors is they are the same size, but the block is sleeved, different rods and pistons as well as other components so they pretty much are a completely different motor which is why they dont sound the same.

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Phil@JDM said:

The RS sounds different probably because it has a different head, different cams, different turbo, different exhaust with electric valve, etc. The only real similarity in the motors is they are the same size, but the block is sleeved, different rods and pistons as well as other components so they pretty much are a completely different motor which is why they dont sound the same.

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Introduction

The exclusive variant of the newly developed and specially adapted 2.3liter EcoBoost gasoline engine develops 257 kW (350 PS).

The following components have been modified:

Cylinder Head
-New aluminum alloy (AS7GU) to improve the heat dissipation.

Cylinder head gasket

Exhaust side valve springs
-The strength of the valve springs has been reinforced

Engine block
-New, high strength engine block to reduce wear at high temperatures and under high loads.
-Machined cylinder block to make space for the transfer case

Flywheel
-Redesigned dual mass flywheel to absorb vibrations and other undesired NVH (noise, vibration, harshness) error states
-Modified DW10F clutch with 'TAC' (Travel Adjusted Clutch) technology enables higher overboost torques and is automatically adapted to the wear

Crankshaft pulley
-The pulley is specially adapted to the RS engine

TC including connections
-The TC is equipped with a new turbine and a larger compressor wheel (2.3622 in (60 mm) to 2.4803 in (63 mm)). This permits a higher boost pressure and ensures improved aerodynamics
Crankcase ventilation
-The flow rate has been increased from 17 liters per minute to 45 liters per minute

Oil filter adapter seal
-A new, synthetic oil is used for the 2.3L EcoBoost for improved lubrication and durability

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