blackbenzz

I was thinking it would be nice to have one thread that has a bunch of info in regards to the AMG supercharger on the 55k motors in one thread. I don't know much about them but I know if we all post what we know we can build a wealth of knowledge on them. If someone could post the sc pulley diameter and if there is a internal gear ratio I could post how fast the Sc is spinning with different crank pulley sizes. If someone knows what these sc are rated to spin to or an efficiency map, post it. Then we can see what size would be overspinning the sc and out of its efficiency. I have heard differing opinions on the size of the blower, anyone know for sure what size it is? I heard it is an IHI unit. Also read it is a Lysholm unit . I have heard everything from 1.8 to 2.3L

TopEndS62

its a IHI unit?.. that would mean our superchargers are made in Japan? i think IHI is a japanese company... don't know why i thought it was lysom..

OXOJE55

+1

blackbenzz

I was told it was an IHI unit, maybe it isn't Thi sis one of the reasons why I started this thread, to get clarity on what is true and what isn't.

This thread has alot of good info in it:
https://mbworld.org/forums/w211-amg/...essor-map.html

MBH motorsports

IHI makes some good stuff, they make turbos for a bunch of cars. Mercedes is the only supercharger that I currently know they make, I wouldn't be surprised if IHI has other cars running IHI superchargers. I just haven't seen any, not like I've been looking though.

The AMG/IHI supercharger is a Lyshom style supercharger. Mercedes runs this supercharger with a 2:1 ratio. The stock crank pulley is twice the size of the supercharger pulley. Stock crank pulley being 152mm and the the supercharger being 76mm. With that said the supercharger spins at double the engines RPMs in a stock application.

blackbenzz

That is another topic that has people stating different things. Stock crank pulley diameter and interal ratio of sc. I've heard 1.66:1 for 55k cars and SLR has 1.83:1 It is so hard to find out what the real values are. For the crank I've heard from 150 to 157mm

If stock crank is 152mm and sc pulley is 76mm then at 6500rpm the supercharger pulley is spinning at 13000rpm. Depending on what the internal gearing is it would be even higher.

Jakpro1

Well the guts are not spinning at 13,000rpm



but 23,000rpms!!

And that is a stocker. Imagine me with a 185 and smaller supercharger pulley.

I know I am well over the law of dimishing returns but it feels so good to swing a big stick sometimes.

http://autospeed.com/cms/title_Supercharger-Steal-Part-Two/A_110295/article.html

The most potent supercharged Mercedes is the SL55 AMG. With a 5.4-litre V8 thumping out 350kW and 700Nm (from just 2650 rpm) that should come as no surprise!
The SL55 AMG’s highly efficient Lysholm-type supercharger (manufactured by IHI) features Teflon coated compressor screws and is driven at more than 23,000 rpm at an engine speed of 6500 rpm. At this speed, the blower displaces 1850kg of induction air per hour and generates up to 12 psi of boost pressure. The supercharger is also equipped with an electro-magnetic clutch that is used to switch it on/off depending on rpm and load. A water-to-air intercooler is also used to help achieve that magic 350kW.
And then there’s the smaller Mercedes SLK32 and C32 AMG.

blackbenzz

That's taking into consideration the internal gearing. That also means the pulley diameters I was using for the calculation is incorrect unless the internal gearing is 1.77 Wow, 23,000rpm is alot of rpms!!! Must make a crazy amount of heat.

Havoc

From what I remember the 55K and the SLR share the same blower.

55K - 11.6 psi (0.8 bar)
SLR - 13 psi (0.9 bar)
SLR 722 GT - 25 psi (1.75 bar)

06E55

Anyway to increase the psi, or is that what an ECU tune effectively does?

blackbenzz

By upgrading to a larger crank pulley you are effectively spinning the supercharger faster and increasing psi.

Havoc

Hey bro, do you know if it was ever confirmed that the SLR's S/C has more boost through different gearing on the rotors and not a larger pulley?
I'm going to have my S/C taken apart to see if changing those gears is possible or not. I'm interested in knowing how the SLR 722 GT gets 25 psi.

MBH motorsports

I might be able to find out this info... I think the first place to state would be cross refinancing the SC's part numbers. IF they are the same, then we know what it is.

Every now and again we see one. So if an SLR passed my way for a dyno run, I'll make a mental note to log the boost.

Marcus Frost

Ahmad why are you messing with blowers still... we have them because we have to... you need to throw it in the garbage and find a way to get a couple of turbos on your car. It really wouldn't be as bad as you think.

-m

Marcus Frost

Havoc you are asking the wrong question. I can make you get 25psi, too. Just reduce the volume of air that can flow through your motor and you can make a lot of boost!

Remember, it's not about BOOST... it's about FLOW. Boost is a measure of pressure, not power. Give me a car that makes 800hp with 10psi over one that makes it with 30psi any day of the week.

-m

Havoc

Cool, thanks bro! Whatever info you can collect would be much appreciated and a huge help.
Now if only you could log the boost of an SLR 722 GT!

From this pic the crank pulley "looks" stock, but the base model SLR has just 1.4 psi (0.1 bar) more boost than our 55K.



The gearing of the SLR and the 55K "looks" to be the same size when you compare these two pics. Be advised that the S/C is upside down in the lower pic of the 55K.

SLR S/C Gears



55K S/C Gears

Havoc

Oh I understand what you're saying about boost and flow, but I'm not asking the wrong question. I want the best of both worlds!
My build is all about more FLOW.. larger displacement, bigger cams and valves, ported heads and S/C, and larger top mounted coolers all of which will lower my boost because of added airflow. I get that. But I want to bring my BOOST back up in addition to having more FLOW.

I'm trying to understand how the SLR 722 GT makes 25 psi. Is the S/C the same as ours and is it spining that fast? I know the SLR has reduced compression compared to our 55Ks, but wouldn't that increase airflow? Have any ideas??

TMC M5

Excellent point! Just as you will probably lose boost when installing headers, but who cares so long as the overall flow (i.e. HP) increases.

Now that I have a CTS-V, I have had to do some research on supercharged V8s. Over on the Cadillac forum I found it extremely useful when members put together a sort of table showing the affects of changing upper and lower pulleys here is an example (Post #7):

http://www.cadillacforums.com/forums...ml#post2229556

Tom

JonMBZ

Looks like they have different superchargers

M155-090-06-80-88 COMPRESSO $13550.00 M155-090-06-80-70 CORE $7390.00
M113-090-05-80-88 COMPRESSO $3690.00 M113-090-05-80-70 CORE $1350.00

Havoc

Thanks JonMBZ for this info!

Hmmm, now I just need to find out the difference between the SLR and the SLR 722 GT Superchargers??

Havoc

Wow, you guys can really pump up the boost. Interesting stuff and thanks for sharing!

Man I know you're enjoying your CTS-V. I was very close on pulling the trigger on one and I still to this day think about getting one. Enjoy!

blackbenzz

Because I don't want to be the guinea pig for such a large endeavor (not to mention price and unknown results). Yes I can probably do turbo/s but it will involve alot of time and money. Remember I have a CLK body and there really isn't much room.

chiromikey

part numbers are probably not going to yield any insight. i'm not saying they're the same blowers but mb is over zealous about changing part numbers not only between different models that share the exact same parts, but even different years that share the same parts.

as an example, when we first did the slr cam swap we all thought we had to change out the cam gears with the cams because they had different part numbers compared to the e. once i received the slr cam gears it was obvious they were the exact same part...just a different part number and a higher price tag.

TMC M5

Thanks! So far just CAI and custom exhaust. The car feels really strong with just those mods. I might try to dyno by this weekend. I might have a package from Lingenfelter by the end of this week.

Tom

Havoc

Oh yeah. I forgot about that post from a while back and how MB will issue different part numbers for different years and models for the same exact part. Thanks for reminding us of this common oversight.
The blowers could very well be the same.

All I want is that damn SLR 722 GT S/C set-up on my modded 55K. Is that too much to ask? I could scrap the S/C and put turbos with a stand alone but I might as well have bought a chevy nova. I want to keep my block, heads, and S/C Mercedes AMG even though it will make less power and cost more bank..
What do you guys think?