Ghostrider

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.

Ghostrider

Case in point.

COOPERDB

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What are you trying to attain

and with what engine


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SaMaS

you should contact member blackbenzz ...

c32kompressor

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

2PRECISE

you need a voltage clamp or signal calibrator

Ghostrider

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.

Ghostrider

I did, between him and Cory at Kleemann I got the information I needed!!

c32kompressor

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

cm60k

Good info., do you know what's the housing dia. of this X5 MAF..?

ZAYED,,

c32kompressor

If I remember correctly ours is 3" and the X5 is 3.5" I'll have to go back and confirm that.

cm60k

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,,

c32kompressor

Search THE blower thread

c32kompressor

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

cm60k

I see..

ZAYED,,

2PRECISE

i have 1 voltage clamp and a 1 signal calibrator for sale

cm60k

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,,

2PRECISE

yes sir

cm60k

Thankss,

sorry, not that much info. about it,,

do you think it can be help to accomplish it with bigger MAF housing..?

ZAYED,,

c32kompressor

no benefit to using this on an N/A application. im using it with my hps gen 2. I couldn't be happier with it. it really does do its job

c32kompressor

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.

ctravis595

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

ctravis595

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

eurochargedw210

Would be best to convert it to speed density, like a 113k. Good luck getting to to run right.

definitely don’t let it run lean at all, will blow that motor really quick.

ctravis595

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