So I am still on my stock turbo and was considering putting my new fmic on while I am at home and have time over xmas break. I currently am cobb stage 2 and am just wondering if I will need to run a different map to put it on, if so I won't put it on until I get a bigger turbo but I am just toying with the idea. I don't really care about the lag I will get for the time being. I am also trying to figure out a way to either relocate a coolant overflow tank or if anyone knows where i can buy the ones that come in regular kits that might work too. i bought an ebay one so I don't know exactly what will fit, and if anyone has or knows where I can get a connector hose for the throttle body please lmk.
Changing the intercooler will change the VE of your motor. AFR usually moves around due to that. On a MAS car it tends to compensate closely, but on a MAP based system, you will need a tune. I would say you can have any shop check your car for AFR and could possibly be good to go.
Shouldn't that be the other way around? On a map car it should be easier for the computer to compensate due to the vacuum readings should be the same in the intake manifold. On a Maf car you would think it would have delay problems since there is alot more volume.
Nope, Josh is right. Think of it this way -- on a MAF based car, it has the ability to meter the total amount of air that is entering into the motor and thus will be able to calculate the correct load and lookup this value for timing/fuel. Changing something like the intercooler on a MAP based car will need a retune since you are changing the total volume of the intake system. Think of this scenerio -- you have X amount of air being crammed into the intercooler/manifold and will have a relative pressure of Y. Now increase the volume of the intercooler and run the same amount of air through the system again. You will see that the relative pressure will drop below our original measurement of Y. So now we have the same amount of airflow, but our ecu is calculating a lower load and will probably throw more timing and less fuel at the motor. And also if the VE of the motor does indeed change, it's timing requirements will also.
Ok that makes a little more sense. He I know this is a little off topic but I have seen some suby's with a maf sensor on the pressure side. Is there a benifit to that?
