Lee C63
MB Enthusiast
This will only be of interest to those of us running Weistec Superchargers. But a good explanation from Weistec themselves how far you can go with stock internals and transmission..
Full thread here- Weistec blower efficiency - Page 2 - MBWorld.org Forums
Boost Ratings
Our Stage 2 system running our 2.3L twin-screw compressor runs about 7-8 psi. This boost rating is with our high flow air filters, and high flow long tube headers. The exact supercharger pulley size is 57mm and this runs the factory crank damper pulley.
Our Stage 3 system running our 3.0L twin-screw runs about 10-11 psi. This boost rating is with our high flow air filters, and high flow long tube headers. The exact supercharger pulley size is 67mm and this runs a completely different 8-rib drive system with our proprietary crank damper pulley.
We offer a 60mm pulley upgrade for the Stage 3 system which turns the boost to about 14-15 psi but this does require additional modifications to hold the power reliably.
How much power can your C63 (722.9) transmission handle
We recommend upgrading the transmission with our transmission packages when power levels start exceeding our Stage 2 power levels (approximately 570HP at the wheels).
How much power can an M156 engine handle
The M156 engine is very resilient but like everything else, it has its limits. The main issue in terms of power limits is the connecting rods in the engine. It will start to fatigue at around 700HP at the wheels. Keeping a keen eye on detonation, and cylinder temperatures will allow you to make more than that, but the risk isn't worth the reward.
The next limit of the engine, is the piston ring land. Now it is worth mentioning that there are 2 different pistons that came equipped with the M156 engine. One is the standard piston and the other is the P31 piston. Although the P31 is a much nicer and stronger piston, the engine consistently runs a very tight ring gap from the factory, which can be catastrophic to a forced induction engine running high cylinder pressures. A P31 piston is more resilient than a standard piston, but enough heat and time will damage the ring land due to a tight ring gaps.
How fast did customers go with off the shelf parts
Stage 2 customers have gone as fast as 10.4 as discussed in an earlier post. Many have gone 10.5's, and there are many more than this that have been in the 10's. You can purchase everything needed straight off of our website to do this. Those that have gone 10.4-10.5's have a better wheel and tire combo, and that is the only thing we don't sell, but we can easily help with.
Stage 3 customers have gone even lower in the 10's. We have Australian customers who have gone 10.3's very easily with our off the shelf system and tuning.
Stage 3 60mm customers have gone 9's and have MPH records with this system.
Boost and the M156 engine
The M156 engine has an extremely efficient cylinder head design, along with great valve shrouding in the cylinder, great oiling, high revs, and high compression. It is very hard to compare this engine to anything out there. Some things do however stay constant. Calculating cylinder pressures, supercharger RPM's against compressor efficiency, intercooler efficiency, etc. will give you an idea of how boost you can safely get away with before having diminishing returns as others said.
Without boring you with actual calculations, we have found that the boost pressures we offer with each system is at its best efficiency for the given combination.
To add, there is no way you can anywhere near 20 psi with our 3.0L system on this engine. The supercharger can't create enough pressure to keep that boost to redline. Not to mention, the air box design is at capacity and will not suffice past the 60mm combo.
Let us know how we can help from here, and always feel free to call us or email us at [email protected]
Thanks again!
Weistec Engineering
__________________
Home of the World's Fastest Mercedes
CONNECT WITH US
Weistec Engineering
[email protected]
Check out our Instagram @Weistec
Weistec on Facebook
Full thread here- Weistec blower efficiency - Page 2 - MBWorld.org Forums
Boost Ratings
Our Stage 2 system running our 2.3L twin-screw compressor runs about 7-8 psi. This boost rating is with our high flow air filters, and high flow long tube headers. The exact supercharger pulley size is 57mm and this runs the factory crank damper pulley.
Our Stage 3 system running our 3.0L twin-screw runs about 10-11 psi. This boost rating is with our high flow air filters, and high flow long tube headers. The exact supercharger pulley size is 67mm and this runs a completely different 8-rib drive system with our proprietary crank damper pulley.
We offer a 60mm pulley upgrade for the Stage 3 system which turns the boost to about 14-15 psi but this does require additional modifications to hold the power reliably.
How much power can your C63 (722.9) transmission handle
We recommend upgrading the transmission with our transmission packages when power levels start exceeding our Stage 2 power levels (approximately 570HP at the wheels).
How much power can an M156 engine handle
The M156 engine is very resilient but like everything else, it has its limits. The main issue in terms of power limits is the connecting rods in the engine. It will start to fatigue at around 700HP at the wheels. Keeping a keen eye on detonation, and cylinder temperatures will allow you to make more than that, but the risk isn't worth the reward.
The next limit of the engine, is the piston ring land. Now it is worth mentioning that there are 2 different pistons that came equipped with the M156 engine. One is the standard piston and the other is the P31 piston. Although the P31 is a much nicer and stronger piston, the engine consistently runs a very tight ring gap from the factory, which can be catastrophic to a forced induction engine running high cylinder pressures. A P31 piston is more resilient than a standard piston, but enough heat and time will damage the ring land due to a tight ring gaps.
How fast did customers go with off the shelf parts
Stage 2 customers have gone as fast as 10.4 as discussed in an earlier post. Many have gone 10.5's, and there are many more than this that have been in the 10's. You can purchase everything needed straight off of our website to do this. Those that have gone 10.4-10.5's have a better wheel and tire combo, and that is the only thing we don't sell, but we can easily help with.
Stage 3 customers have gone even lower in the 10's. We have Australian customers who have gone 10.3's very easily with our off the shelf system and tuning.
Stage 3 60mm customers have gone 9's and have MPH records with this system.
Boost and the M156 engine
The M156 engine has an extremely efficient cylinder head design, along with great valve shrouding in the cylinder, great oiling, high revs, and high compression. It is very hard to compare this engine to anything out there. Some things do however stay constant. Calculating cylinder pressures, supercharger RPM's against compressor efficiency, intercooler efficiency, etc. will give you an idea of how boost you can safely get away with before having diminishing returns as others said.
Without boring you with actual calculations, we have found that the boost pressures we offer with each system is at its best efficiency for the given combination.
To add, there is no way you can anywhere near 20 psi with our 3.0L system on this engine. The supercharger can't create enough pressure to keep that boost to redline. Not to mention, the air box design is at capacity and will not suffice past the 60mm combo.
Let us know how we can help from here, and always feel free to call us or email us at [email protected]
Thanks again!
Weistec Engineering
__________________
Home of the World's Fastest Mercedes
CONNECT WITH US
Weistec Engineering
[email protected]
Check out our Instagram @Weistec
Weistec on Facebook
