Need to "LOWER" boost....
Thread Starter
Super Member
Joined: Oct 2005
Posts: 846
Likes: 1
From: Miami, Maracaibo, Bogota
not stock.
Need to "LOWER" boost....
Im working on retrofitting a C32 supercharger (thanks AMG Jerry) on to my SLK320..... One thing im stuck on is what would be the best method to lower the boost??? I believe the C32 blower peaks out at 14.5lbs stock ?? Is this true?? Anyways, I need to lower it to a solid 6lbs.... should I get a custom "larger" pulley done for the blower itself or should I get a smaller crank pulley ?? Any ideas / suggestions greatly appreciated.........
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Joined: Aug 2006
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From: Houston
C63S
Im working on retrofitting a C32 supercharger (thanks AMG Jerry) on to my SLK320..... One thing im stuck on is what would be the best method to lower the boost??? I believe the C32 blower peaks out at 14.5lbs stock ?? Is this true?? Anyways, I need to lower it to a solid 6lbs.... should I get a custom "larger" pulley done for the blower itself or should I get a smaller crank pulley ?? Any ideas / suggestions greatly appreciated.........
I would go with the smaller crank pulley.
Another option would be to use a thicker head gasket / spacer to lower the compression ratio.
I lost about 3.5lbs of boost after I ported my heads, so that would be an option too. If you get the heads ported, then they could do some work on the combustion chamber and lower the compression ratio there too.
Good luck with the project!
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Joined: Mar 2006
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From: Ohio
...
the one thing to keep in mind when going with a smaller crank pulley is that if you do this, you will have to address the other accessories that will be slowing down...in other words, you don't want to go too small otherwise you will cause other problems...
i can probably have a custom crank pulley made for you, just let me know if you are interested and i can check into it...
i can probably have a custom crank pulley made for you, just let me know if you are interested and i can check into it...
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I have read about how more efficient exhuast also reduces some boost... why is that exactly? Would it have to do with the valve overlap and the fact that it is allowing more to get out before the exhaust valve fully closes? That would make the most sense.
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Joined: Jan 2004
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From: Silicon valley
Audi C7.5 S6
It is not really boost per se, that gives more power, it is the volume of Oxygen and Fuel combustion , one can push through the engine, per revolution. The boost is just a measure of how much extra air is being pumped into the engine. If the exhaust/intake flows easier, then there is less restriction/back pressure, which may lower the boost, but not the volume of air.
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Thread Starter
Super Member
Joined: Oct 2005
Posts: 846
Likes: 1
From: Miami, Maracaibo, Bogota
not stock.
the one thing to keep in mind when going with a smaller crank pulley is that if you do this, you will have to address the other accessories that will be slowing down...in other words, you don't want to go too small otherwise you will cause other problems...
i can probably have a custom crank pulley made for you, just let me know if you are interested and i can check into it...
i can probably have a custom crank pulley made for you, just let me know if you are interested and i can check into it...
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Thread Starter
Super Member
Joined: Oct 2005
Posts: 846
Likes: 1
From: Miami, Maracaibo, Bogota
not stock.
I would go with the smaller crank pulley.
Another option would be to use a thicker head gasket / spacer to lower the compression ratio.
I lost about 3.5lbs of boost after I ported my heads, so that would be an option too. If you get the heads ported, then they could do some work on the combustion chamber and lower the compression ratio there too.
Good luck with the project!
Another option would be to use a thicker head gasket / spacer to lower the compression ratio.
I lost about 3.5lbs of boost after I ported my heads, so that would be an option too. If you get the heads ported, then they could do some work on the combustion chamber and lower the compression ratio there too.
Good luck with the project!
Super Member
Joined: Jan 2004
Posts: 538
Likes: 2
From: Silicon valley
Audi C7.5 S6
The exhaust valve is only closed for very short time, as is the intake valve. Typically, there is also some valve exhaust/intake overlap time, which helps with high RPM HP.
If the exhaust valves never opened, then the engine would not run.
If the exhaust valves never opened, then the engine would not run.
Last edited by m444; Nov 29, 2007 at 08:26 PM.
Thread Starter
Super Member
Joined: Oct 2005
Posts: 846
Likes: 1
From: Miami, Maracaibo, Bogota
not stock.
as an update to this... i wanted to say that ASP is going to manufacture for me a one-off S/C pulley that will limit boost to a "Whopping"(lol) 7lbs of boost.
Once I get this... its off to finally mount everything on the car, btw... the clutch is going to be engaged at all times... were adding a bypass valve to the whole system...
Once I get this... its off to finally mount everything on the car, btw... the clutch is going to be engaged at all times... were adding a bypass valve to the whole system...
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Joined: Apr 2006
Posts: 3,255
Likes: 22
From: Seattle
w203 m112
Cool project. Ive been watching this whole time!
Keep us updated. Itd be really dang cool if ya got pix of the whole engine in pieces/what nots
Ive always wondered what the intake manifold looks like off m112.
Keep us updated. Itd be really dang cool if ya got pix of the whole engine in pieces/what nots
Ive always wondered what the intake manifold looks like off m112.
Thread Starter
Super Member
Joined: Oct 2005
Posts: 846
Likes: 1
From: Miami, Maracaibo, Bogota
not stock.
as of now... Im only missing one part.. the "intercooler" ... the wrest is all there..
1. S/C & hardware
2. Intake plenums
3. I/C pump
4. Heat Exchanger
5. FMU
6. Colder Plugs
7. Pulley (in the works)
Once I finally get the new pulley, figure out what new belt to use and get the intercooler (ive been trying to get a used one and save some couple $$$, but if worse comes to worse ill just buy it new) Ill mount everything on the car..
For all of you that are wondering Cost on this... its all been kept well under $3K.. but I still need to add the cost of the Intercooler... and after that im budgeting another $500 for all miscellaneous stuff, dyno time..etc etc. Im trying to keep everything under $5000 to make it all worth it.
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Joined: Apr 2006
Posts: 3,255
Likes: 22
From: Seattle
w203 m112
Awesome! Would ya be willing to take pix of all the parts before ya put them on? :x
Im surprised you dont have a more detailed thread in the r170 forums...
What kinda numbers are you expecting from this lil adventure?
Im surprised you dont have a more detailed thread in the r170 forums...
What kinda numbers are you expecting from this lil adventure?
Thread Starter
Super Member
Joined: Oct 2005
Posts: 846
Likes: 1
From: Miami, Maracaibo, Bogota
not stock.
to be honest, im hoping to match or surpass Kleeman numbers...
Newbie
Joined: Jun 2008
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05 crossfire roadster convertible
Im working on retrofitting a C32 supercharger (thanks AMG Jerry) on to my SLK320..... One thing im stuck on is what would be the best method to lower the boost??? I believe the C32 blower peaks out at 14.5lbs stock ?? Is this true?? Anyways, I need to lower it to a solid 6lbs.... should I get a custom "larger" pulley done for the blower itself or should I get a smaller crank pulley ?? Any ideas / suggestions greatly appreciated.........
hey guys, new to the site, hoping to pick some stuff up from you mb guys, i have a crossfire roadster, na, and i have intake, exhaust, ngk iridiums, all 12 of them, lol, and a zex 75 shot, i am looking to do a low boost setup, i see you are using a c32 blower i hope this works out for you can you give me an idea of where to get parts and what i should go with. i also think the custom pulley is the way to go.
