Have you guys seen this article? It is from our brothers at mbworld. It was from a Taiwan tuner who did some serious mods to a C32. The ending quarter mile numbers don't add up, BUT the interesting part is where the tuner mentions upping the crank pulley to 182mm and decreasing the supercharger pully to 72mm. So it seems to me that LET has done nearly the same thing with their 185mm pulley...obviously you still have some supercharger RPM left with a 185mm pulley like Sidez mentioned, BUT the efficiency of the supercharger decreases as RPM increases. Longivety also decreases with increased supercharger RPM, so to get the full potential of the engine and its boost capabilities I think you need to look at more efficient means at creating higher boost levels above the 185mm pulley...Thoughts?


http://www.mbworld.org/forums/showth...0hp+who&page=3


Dear all, spent sometime translating the report from the Taiwan Tuner who make 500hp C32. My English is not that good, hope you guys can read. Let me know if there are typos and errors as i did it in a rush.


Located north of Taiwan, best known for modding AMG cars, “Hin Yu Tuning” founded by a 15 year MB technician, Mr Ling. He created numerous modded AMG monsters from AMG55s to AMG32s. His modded engines are of high compressions, superb cooling capabilities, yet durable. In terms of quality, acceleration, durability and completeness, his cars are comparable with all original AMGs.

W203 C32 and all AMG55 are famous car for modding in our territory, C32 engine is a M112 SOHC 3 valves 3.2L V6 supercharged engine (354hp/6100rpm, 45,9kgm/4100rpm). AMG55 is a M113 SOHC 3 valves 5.5L V8 engine (476hp~500hp/6100rpm 71.4kgm/2650-4500rpm) Originally, the cars have high output. However, in order to keep the engine more durable, and to cope with environmental issues, the boost is adjusted to a lower levels. (C32AMG ~1.1bar, 55AMG~0.8bar) Therefore, increasing the boost pressure is the easiest way to extract more power and accelerations out from these engines.

The best way to increase boost pressure is to use either a smaller supercharger pulley or a larger crank pulley to increase the speed of the supercharger, thus forcing more air into the engine. Take C32AMG as an example, the original C32 supercharger pulley measures 74mm, crank pulley, 150mm. You may reduce the supercharger pulley to 72mm, with a crank pulley of 170mm-182mm to get more power. With the installation of a Schrick 272 duration cams and a 182mm pulley, the boost can reach 1.7-1.8 bar (original 1.1-1.2bar). this mod can bring the power of the C32 from 354hp to 450hp.

In order to improve the intake, the air filter are changed to a high flow filter, allowing more air into the engine, enhancing the benefits from the cams. Exhaust system are replaced by an equal length stainless steel headers, 74mm, 80mm downpipe, racing cats, and a quad exhaust muffler finished in AMG tips to increase exhaust flow. The system produces a deep sound at low rpms and a high pitch sound at high rpms.

Optimum ignition timing and fuel amount is controlled by computer chip produced by Pro-Tech. Sparks plugs are upgraded to Iridium Plugs. The original fuel pump and fuel injectors are already at high performance and need not be replaced.

As most of the engine parts of AMG car are forged, there is no need to replace. However better cooling is needed as the biggest enemy to high compression engines is heat. The radiator is therefore replaced by a larger unit, an intercooler is added with the Aquamist spray cooling system. (Valve opens at preset boost, water is sprayed to the radiator for max cooling, good for any car type)

Another part needed to be changed is the fuel cooler branched from the air conditioning system, this fuel cooler can reduce the temperature of the fuel, decreasing engine detonation at high rpms, protects the engine from the damages caused by high boost pressure. This cooling mod can increase the durability of forced induction engines. Coolant and engine oils uses original AMG products. For example Mobil 1 0W-40 is the recommended engine oil for AMG cars, providing superb engine cooling and lubrications.

In fact C32AMG can take on the valve cover of the later 3.7L SOHC 3 Vales W220-S350, Cylinder block and the forged valves of the E55AMG.. this mod can bring the displacement of the C32 to 3.7L level to produce more output. This is the famous mod for Hin Yu Tuning. Thismod prduces more mid to high end torque, coupled with a supercharger specifically for 4.0L engines to produce an output of about 500hp. His cars are the AMG of AMGs.

This exotic W203 C32KT 3.7L is one of the highest output of the 5 C32KT Hin Yu Tuning has ever produced. This car fears all exotics on the road and its famous of the use of the W220-S350 block.

The 3.2 V6 cylinder matches the 3.7L V6 block perfectly, also the oil pan matches perfectly too. With the 3.7L block, boreincreased from 89.9mm to 97mm, with the same stroke of 84mm, displacement increased from 3199cc to 3724cc. With the larger displacement, the original C32 supercharger is no longer capable for producing high boost, boost is lowered to below 1.0 bar.

Therefore Hin Yu Tuning decided to replace the Whipple supercharger with the 05-06 Mustang GT 4.6 supercharger. The whipple supercharger is also a twin screw supercharger, model# M6066-M463. The physical size of the supercharger needed to be reduced 1mm all round to ensure a perfect fit to the 3.7L engine. Boost level is increased to 1.5bar with proper intake, pulley upgrade.

To increase engine response, Hin Yu tuning added a Schrick 268/272 Hi Cam to increase intake duration, together with the forged valves from the E55AMG, equal length valves can also increase engine strength.

With the ITG high flow filters, equal length headers, dual straight downpipe, high flow racing cats, and a quad exhaust muffler, the intake and exhaust flow is enhanced. Lastly with a fuel regulator, Iridium plugs and a Pro_Tech computer chip to optimize ignition timing for the best output.

In terms of transmission, only the final gear requires modding, the existing transmission on the C32AMG is very similar to the E55AMG transmission in terms of structure and gear ratio.

For cooling, Hin Yu Tuning has replaced a larger radiator, oil cooler, added an internal intercooler, high flow water pump and Aquamist to reduce engine heat.

Suspension uses Bilstein PSS9, wheels, 18 BBS RGT, P Zero 225-40 and 255-35 tyres. Front brakes are AMG 6 Pot and AMG 4 Pot, pagid pads.

Interior used Carlsson carbon fibre trims, Seats are blue black 2 tone. Guages such as boost pressure, oil pressure, oil temp are installed

C32KT has a max power of about 500hp. Stock C32AMG without speed limitor is already capable for a speed of 300km/h. With all the mods, the C37KT hits 180km/h in no time, the 200km/h to 300km/h range is what the C32KT built for. After 4 tests, C32KT 0-60mph in 5s, quarter mile, 13.1s, 0-200km.h in 10.5s, implying this is a car for the top end.