Can a change in SW disengage the SC below a certain load? (or a switch to off?)
Thread Starter
Member
Joined: Apr 2007
Posts: 247
Likes: 0
From: Republican Wasteland
HPF E46 M3 Turbo, LET C32 AMG
Can a change in SW disengage the SC below a certain load? (or a switch to off?)
Is there a way to tune the software to engage the supercharger at only a certain engine speed or throttle position/engine load? I really don't need it at the low low rpms I drive with the kids in the car....But i want it for when its just myself in the car....
Is there a parameter in the ECU that can be modified?
Also, exactly when is the SC disengaged? And what conditions cause it to engage?
Ive owned SC'd project cars before, but they were all NA cars that were converted (and none of them had a SC clutch that was actuated by the engine management)...
Its just a little frivolous to have 20+ PSI at 1800 RPM when im just driving to the grocery store. I want to keep this as my daily driven car, but the fuel consumption at low RPM is just ridiculous
Any insight or ideas would be greatly appreciated
Thanks!!!
Is there a parameter in the ECU that can be modified?
Also, exactly when is the SC disengaged? And what conditions cause it to engage?
Ive owned SC'd project cars before, but they were all NA cars that were converted (and none of them had a SC clutch that was actuated by the engine management)...
Its just a little frivolous to have 20+ PSI at 1800 RPM when im just driving to the grocery store. I want to keep this as my daily driven car, but the fuel consumption at low RPM is just ridiculous
Any insight or ideas would be greatly appreciated
Thanks!!!
MBworld Guru
Joined: Apr 2002
Posts: 22,058
Likes: 18
From: Diamond Bar, CA
W206 PHEV AMG
s/c is disengaged before 2800rpm if there is no heavy load on the throttle. (I'm a little iffy on the rpm. some say 1500rpm, but I remember I read 2800rpm back in the days)
not sure if it's possible to turn it off at higher rpm it could be possible if you can cut off the power to the electric clutch.
not sure if it's possible to turn it off at higher rpm it could be possible if you can cut off the power to the electric clutch.
MBWorld Fanatic!
Joined: Oct 2006
Posts: 4,856
Likes: 4
02 C32 AMG
you dont hit 20+psi at 1800 rpm if any psi at that rpm. you hit those higher levels of boost at the very top of 3rd and 4th gear.
MBworld Guru
Joined: Apr 2002
Posts: 22,058
Likes: 18
From: Diamond Bar, CA
W206 PHEV AMG
Thread Starter
Member
Joined: Apr 2007
Posts: 247
Likes: 0
From: Republican Wasteland
HPF E46 M3 Turbo, LET C32 AMG
I was just saying that it is very obvious that the SC is working below 2000 RPM. My M3 (pre turbo) had nowhere near the mountain of super-low-end torque of this car (even when I'm barely on it). The M3's 3.2l motor had an 11.5:1 compression ratio, and had no low end despite that. The C32 (with a relatively low 9.0:1 CR) has sooo much torque (available where the M3 would almost stall). So the SC is definitely working very low down.
A 3.2l motor with a 9.0:1 CR should feel pretty lethargic with the SC fully disengaged.
Thread Starter
Member
Joined: Apr 2007
Posts: 247
Likes: 0
From: Republican Wasteland
HPF E46 M3 Turbo, LET C32 AMG
Trending Topics
MBworld Guru
Joined: Apr 2002
Posts: 22,058
Likes: 18
From: Diamond Bar, CA
W206 PHEV AMG
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,034
Likes: 1
2005 Pontiac GTO 6.0 LS2 - Blue
After installing a boost gauge I have noticed the supercharger will engage, and boost upwards of 10PSI with light throttle applied at lower speeds. The c32 will shift all the way up to 5th around 45MPH, so you're driving around in a gear that is meant for 140+MPH. Boost is required to accelerate in this condition... Best way to avoid boosting is using the manual automatic to hold the transmission in lower gears.
Last edited by gt4awd; Jun 22, 2010 at 03:27 PM.
MBWorld Fanatic!
Joined: Oct 2006
Posts: 4,856
Likes: 4
02 C32 AMG
well the supercharger switch has been uninstalled. it won't work on any cars that come from MB with a supercharger. I was getting a code from the electromagnetic clutch plate constantly. i dont recall if it was a resistance incompatibility or something to do with the car reading a different amount of metered air or something. either way, the ECU is incompatible with it. everything is back to normal again
Thread Starter
Member
Joined: Apr 2007
Posts: 247
Likes: 0
From: Republican Wasteland
HPF E46 M3 Turbo, LET C32 AMG
well the supercharger switch has been uninstalled. it won't work on any cars that come from MB with a supercharger. I was getting a code from the electromagnetic clutch plate constantly. i dont recall if it was a resistance incompatibility or something to do with the car reading a different amount of metered air or something. either way, the ECU is incompatible with it. everything is back to normal again
MBWorld Fanatic!
Joined: Oct 2006
Posts: 4,856
Likes: 4
02 C32 AMG
i honestly doubt it, regardless of what tuner you go to. i didn't exactly go to a slouch shop.....dynocomp with their renntech tuner
Super Moderator Alumni
Joined: May 2006
Posts: 4,539
Likes: 4
From: Southern Cal
a C32 AMG & S-Works Tarmac
Doing a quick search of the forum should return results that show that the S/C on the C32 engages at about 2900 rpm OR about at 40% - 44% load. That is why the S/C can be working from a stand still or disengaged at 50 mph.
MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,034
Likes: 1
2005 Pontiac GTO 6.0 LS2 - Blue
I have the 185MM tune through Eurocharged but through my current observations the supercharger will never engage to the point of boosting at any RPM. You must apply enough throttle, and in the case of Eurocharged tune it is certainly less than 40% throttle to boost. More around 10-20%. However, I could see the clutch engaging slightly to spin the rotors thus allowing more flow of air without boosting.
