Sport underdrive pulley?

[noogieman]

How much power and tourqe can I get if I install an underdrive pulley like this one on a C43 AMG?
Since the car is a non supercharged engine will there be any improvement with this pulley?
I link the part.
This part looks to be made of better quality than others seen on internet?

Under-Drive Performance Pulley Kit All Mercedes-Benz V6 & V8 '98-'06 3-valve motors: Bekkers.com Driiv Autosport

 

[Stratman]

See here.

 

[Bellow]

The rest of the world would to do well to adopt an American principle - in which the vendor does the selling. Let the vendor convince you of the benefits of the product or service on offer. If they fail to do that - don't buy...

Mercedes, in this case, built the charging and cooling systems with a certain margin of over capability to cover all eventualities. That's what you trade away. The ability to cool the engine in a very hot climate, or a very cold climate when the radiator is half blocked with snow: the ability to maintain battery charge with all electrical equipment running. I don't even want to discuss under-supplying the steering system...
There is a much easier and cheaper way to achieve under engineering - buy a Vauxhall.

 

[DRBC43AMG]

I would recommend a normal size. Try these people: Abedin Motorsports  "Uncompromised Performance"

 

[noogieman]

The rest of the world would to do well to adopt an American principle - in which the vendor does the selling. Let the vendor convince you of the benefits of the product or service on offer. If they fail to do that - don't buy...

Mercedes, in this case, built the charging and cooling systems with a certain margin of over capability to cover all eventualities. That's what you trade away. The ability to cool the engine in a very hot climate, or a very cold climate when the radiator is half blocked with snow: the ability to maintain battery charge with all electrical equipment running. I don't even want to discuss under-supplying the steering system...
There is a much easier and cheaper way to achieve under engineering - buy a Vauxhall.

Hey bud, I take it you are not so positive about this single part of improving a cars performance?
I guess it's better to leave my engine original or to add a supercharger instead or the E55 engine?
Am I right?

I would recommend a normal size. Try these people: Abedin Motorsports* "Uncompromised Performance"

About these pulleys from Abedin, I have red some mixed opinions about this pulley!
Some buyers turned out to be not so happy with this part according to US forums!
If I remember correct they caused more problems than positive performance?

I have bought a new HB pulley for my car but it's the Corteco part, the updated part for crankshaft, maybe one day I have to change this part, because the rubber detoriates over time from massive engine heat in the engine bay.

I was only curious if there was a better part for underdrive pulleys that might help to improve my cars performance?
I guess an engine swap from a E55 to make my car a C55 b-stard is the best way to go or adding a supercharger?

Maybe playing around with the wrong pulleys might damage my car instead of using approved parts!

 

[noogieman]

See here.

yeah, they have alot of pulleys.
underdrive: does it mean there is less resistance from these pulleys?
the car goes smoother?
if yes then MB and every carmanufacturer should have done this long time ago?

just adding another pulley that is not in specs dimensions compared with the original part, would it cause more trouble than positive performance?

 

[Stratman]

Underdriving means the crankshaft pulley is smaller than Mercedes' original fitment. This means the alternator, water pump, steering pump and A/C comperssor are all driven more slowly for a given engine speed, the theory being less engine power is consumed in driving them so more is available for your right foot.

I wonder why Mercedes chose the size they did, and not a smaller one.

 

[noogieman]

Underdriving means the crankshaft pulley is smaller than Mercedes' original fitment. This means the alternator, water pump, steering pump and A/C comperssor are all driven more slowly for a given engine speed, the theory being less engine power is consumed in driving them so more is available for your right foot.

I wonder why Mercedes chose the size they did, and not a smaller one.

maybe Benz calculated the weight balance?
maybe that's why it's so big the original pulley?

well when the day comes to change the pulley I will use my new replacement part.
I will not fiddle with unknown parts, that might damage my engine.

 

[Bellow]

Mercedes, in this case, built the charging and cooling systems with a certain margin of over capability to cover all eventualities.

That's why Mercedes made the pulley the size it is.
It is the engineering integrity that made Mercedes famous while others built to a price.

Why buy a Mercedes then deliberately under engineer it? For what? A few horsepower at best.

 

[noogieman]

That's why Mercedes made the pulley the size it is.
It is the engineering integrity that made Mercedes famous while others built to a price.

Why buy a Mercedes then deliberately under engineer it? For what? A few horsepower at best.

what can I say bud.
when you read abouut performance parts on the internet, bogus adds catch your eyes!
Is this for real or is it bougus?
I guess people have to use their common sense before doing something.
I'm glad there are forums on internet with people whom are willing to share their knowledge with others less fortunate to know abouut specific parts.
much obliged.

 

[C43AMG]

See here.

$ 2,495.00 for the CL55.

 

[Bellow]

what can I say bud.
when you read abouut performance parts on the internet, bogus adds catch your eyes!
Is this for real or is it bougus?
I guess people have to use their common sense before doing something.
I'm glad there are forums on internet with people whom are willing to share their knowledge with others less fortunate to know abouut specific parts.
much obliged.

It's not that it's bogus. By drawing less energy from the crank to drive the ancillaries more will be left and available to accelerate the car. So performance will improve.
But the direction you are going in, if taken to the Nth degree is complete disconnection of the water pump, alternator, PAS pump, and air-con compressor. Obviously no one would contemplate doing that. But how far towards it are you prepared to go from what Mercedes consider the correct input of energy to these systems to operate them safely with a margin of safety for any unforeseen circumstance? The unforeseen by its very nature being unforeseeable!

 

[dickchailey]

If I recall correctly my Nissen Z car disconnected the clutch on the AC compressor when the kickdown was operated. A few more BHP when needed! Could have done with a feature to disconnect the kickdown alltogether in the wet to stop the car spinning 180 degrees!

 

[Bellow]

I think more than Nissan have gone that route. Also, the PAS systems now are increasingly electric and moves towards electrically driven water and oil pumps will lessen the drag yet. No electric drive for the alternator though!!!

 

[NormanC]

Don't forget that the crankshaft is subject to cyclic forces (i.e. the firing of each cylinder rather than a totally smooth generation of torque). Both the size and the mass of the crankshaft pulley is likely to be critical in damping out the torsional vibrations caused by the cyclic force input.

In layman's terms, if you change the front pulley for something different you could end up breaking your crankshaft!! I have seen a crankshaft which has failed through fatigue caused by excessive torsional vibrations.

 

[Bellow]

Don't forget that the crankshaft is subject to cyclic forces (i.e. the firing of each cylinder rather than a totally smooth generation of torque). Both the size and the mass of the crankshaft pulley is likely to be critical in damping out the torsional vibrations caused by the cyclic force input.

In layman's terms, if you change the front pulley for something different you could end up breaking your crankshaft!! I have seen a crankshaft which has failed through fatigue caused by excessive torsional vibrations.

Seconded.
Allied to talk of the pulley having rubber...
If so, probably a harmonic balancer and not to be messed with.

 

[NormanC]

No electric drive for the alternator though!!!

Roof mounted wind farm????

 

[Bellow]

Roof mounted wind farm????

But for the aero drag!! Oh, and the look of it....