Supercharger+MAF Resistor
Thread Starter
MBWorld Fanatic!
Joined: May 2005
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From: KCMO, but Houston is my home.
01 CLK 430
Supercharger+MAF Resistor
Ok, I've looked and searched and I'm still having trouble figuring this out... 
What needs to be done to the mass airflow sensor once the car has been supercharged?!?
Any help would be greatly appreciated.
What needs to be done to the mass airflow sensor once the car has been supercharged?!?
Any help would be greatly appreciated.
Super Member
Joined: Jan 2010
Posts: 769
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From: Orlando FL
CLK55 AMG
I'm currently supercharging my w209 55 with the hps kit and an m112 blower. I am getting an actual ecu tune. I wouldn't try to cheat around with this car. It will be much much safer with a full tune. Then you won't have to mess with the MAF. AFRs will look much better too
Thread Starter
MBWorld Fanatic!
Joined: May 2005
Posts: 1,843
Likes: 4
From: KCMO, but Houston is my home.
01 CLK 430
I have a safe tune on it, but you will still need a volatge clamp of some kind for the CEL of having a blower on a N/A motor.
I'm currently supercharging my w209 55 with the hps kit and an m112 blower. I am getting an actual ecu tune. I wouldn't try to cheat around with this car. It will be much much safer with a full tune. Then you won't have to mess with the MAF. AFRs will look much better too
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Super Member
Joined: Jan 2010
Posts: 769
Likes: 4
From: Orlando FL
CLK55 AMG
the answer to that can be simple. the BMW X5 MAF housing fits our sensors and is a bit bigger in diameter. this will slow the velocity of the incoming air but still provide volume. it will bring down the MAF voltage under 4.9v keeping your stock sensor in range
MBWorld Fanatic!
Joined: Aug 2006
Posts: 7,053
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From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
Tried (3.3" = 84mm) X5 MAF, as expected, horrible hesitation, MAF refuse to reads more than (3" = 76mm) housing..
,
i didn't hear any N/A M113 increase MAF housing with ECU tune,,
if anyone done that, pls. chime in..
ZAYED,,
, i didn't hear any N/A M113 increase MAF housing with ECU tune,,
if anyone done that, pls. chime in..
ZAYED,,
Super Member
Joined: Jan 2010
Posts: 769
Likes: 4
From: Orlando FL
CLK55 AMG
I just purchased a voltage clamp from split second tuning. 89$ it conditions the voltage back down to max valvue once it sees the MAF go above 4.9v
Google them and take a gander. They've got a lot of tuning equipment
Google them and take a gander. They've got a lot of tuning equipment
MBWorld Fanatic!
Joined: Aug 2006
Posts: 7,053
Likes: 398
From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
Hey Alex,
do you mean this:
https://mbworld.org/forums/engine-pe...age-clamp.html
is there any benefits for N/A M113, or just identify the voltage of MAF..?
ZAYED,,
do you mean this:
https://mbworld.org/forums/engine-pe...age-clamp.html
is there any benefits for N/A M113, or just identify the voltage of MAF..?
ZAYED,,
Super Member
Joined: Jan 2010
Posts: 769
Likes: 4
From: Orlando FL
CLK55 AMG
Hey Alex,
do you mean this:
https://mbworld.org/forums/engine-pe...age-clamp.html
is there any benefits for N/A M113, or just identify the voltage of MAF..?
ZAYED,,
do you mean this:
https://mbworld.org/forums/engine-pe...age-clamp.html
is there any benefits for N/A M113, or just identify the voltage of MAF..?
ZAYED,,
Super Member
Joined: Jan 2010
Posts: 769
Likes: 4
From: Orlando FL
CLK55 AMG
no need for bigger maf housing with the voltage clamp. I have mine set at 4.89v no cel and no lean conditions. the best way to run a supercharged setup is with injectors an upgraded fuel pump and this voltage clamp, with an ecu tune. my afrs go no where near lean.
MBWorld Fanatic!
Joined: Jul 2012
Posts: 1,254
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2002 CL500 to CL55 conversion
I have seen 550k ohm resistors as being the recommendation for 7-8 psi m113 setups for maf. However what wattage rating are these resistors? 1/4 watt? 1/2 watt?
Diagnosing a scenario where I’m getting a p0102 or p0100 code sometimes after a turbo build, peaking around 7 psi
edit oops nevermind, I needed 550ohm resistors not 550k ohm resistors. I’m no longer running lean under prolonged boost however the car seems to have lost some power
Diagnosing a scenario where I’m getting a p0102 or p0100 code sometimes after a turbo build, peaking around 7 psi
edit oops nevermind, I needed 550ohm resistors not 550k ohm resistors. I’m no longer running lean under prolonged boost however the car seems to have lost some power
Last edited by ctravis595; Apr 12, 2020 at 10:54 AM.
MBWorld Fanatic!
Joined: Jul 2012
Posts: 1,254
Likes: 171
2002 CL500 to CL55 conversion
After more trial and error I tried the 550ohm setup, and even tried replacing the maf. It always wants to throw a p0100 obd code for maf circuit error with the 550 ohm resistor setup
I tried 470ohm, same result ...
I noticed I can get the car to boost 4-5psi before it hit fuel cut with NO resistors ..
so if my target of 7-8 psi isn’t too far away from 5 psi where the fuel cut is happening, I believe 550 ohm might be too high of a resistance ...
it’s quite a lot of resistance if you consider it’s also dumbing down the signal during idle as well...
I have instead started experimenting with much smaller resistor values, I have tried a 20ohm resistor, the car was running very strong but I believe around 5psi on WOT I started to get fuel cut, it could be my spark plugs though. I ordered some m113k spark plugs to eliminate that possibility ...
I also believe some of lean issues mentioned in my last post were due to a bad maf and old o2 sensors
I tried 470ohm, same result ...
I noticed I can get the car to boost 4-5psi before it hit fuel cut with NO resistors ..
so if my target of 7-8 psi isn’t too far away from 5 psi where the fuel cut is happening, I believe 550 ohm might be too high of a resistance ...
it’s quite a lot of resistance if you consider it’s also dumbing down the signal during idle as well...
I have instead started experimenting with much smaller resistor values, I have tried a 20ohm resistor, the car was running very strong but I believe around 5psi on WOT I started to get fuel cut, it could be my spark plugs though. I ordered some m113k spark plugs to eliminate that possibility ...
I also believe some of lean issues mentioned in my last post were due to a bad maf and old o2 sensors
MBWorld Fanatic!
Joined: Jul 2012
Posts: 1,254
Likes: 171
2002 CL500 to CL55 conversion
Yea speed density would be cool, however I think I’ve found a real solution
maf clamps are nothing new, despite only a few Mercedes cars bothering With them
this webpage explains using a zener diode to more properly let the maf behave at normal airflow ranges
and then only caps the voltage once it gets above a certain point
I ordered 4.5 volt diodes, will report back with my findings
http://www.tuimotorsports.com/tui-mo...lize/maf-clamp
maf clamps are nothing new, despite only a few Mercedes cars bothering With them
this webpage explains using a zener diode to more properly let the maf behave at normal airflow ranges
and then only caps the voltage once it gets above a certain point
I ordered 4.5 volt diodes, will report back with my findings
http://www.tuimotorsports.com/tui-mo...lize/maf-clamp
