maf relocation

[dranttna]

so i have a turbod m50 and have been having some problems with it in higher rpm. im thinking its due to some hidden boost leaks so i wanted to know how much pressure a stock hfm can handle if placed in the charge pipe. also if the hfm case itself can hold boost will it affect the meassurments any sampleing from slower flowing and hot air instead of befor the turbo witch is cool fast flowing air?
srry for any misspellings im using a ps3 controller, and thanks for any help.

[Danny]

What psi are you running? What tuning?

From what I understand you're running a blow through setup?

[dranttna]

tuned by trm. the blowoff valve is my main concern and i wanted the hfm to be behind that point at least. i can feel a slight vacuum on the opening and didnt want to run a recycle hose across the bay
edit: psi is 8 right now, maybe 15-20 soon

[Tchao]

If your tune is for a blow-through you should be fine.
Contact TRM though...there maybe issues with your tune. I thought most DME tunes are pull-though meaning pre-turbo.

Id highly suggest you get a nice bypass valve sold here locally by Mitch. BOVs suck.
Where in phoenix are you? You should attend one of the meets sometime, would love to check that car out.

[dranttna]

what meets are around here? i heard of one down in ahwatukee but i just moved from down there up to avondale for school. im also at pavillions some times but its a far drive now...

[mrsleeve]

why are you using a MAF on turbo car????

You should have swapped out to a MAP long ago

[dranttna]

You should have swapped out to a MAP long ago

once i have a chance to contact trm i am going to see if they can tune it for a map instead. my bank account is just about dry so i cant afford a stand-alone for a while.

[Jaxx_]

why are you using a MAF on turbo car????

You should have swapped out to a MAP long ago

what the hell is wrong with a MAF setup? I'm even pretty sure that a MAF setup will be more accurate than using MAP.

[nando]

what the hell is wrong with a MAF setup? I'm even pretty sure that a MAF setup will be more accurate than using MAP.

huh?

There's nothing wrong with using MAF on a turbo car, but it is a little easier to work with pressure rather than airflow.

[dranttna]

i agree the maf is workin fine. im thinking about doing a map though but the manifold seems like it might have uneven pressures due to its design. were would the best place for a map be if i was to install on down the road?

[5KWattson]

i agree the maf is workin fine. im thinking about doing a map though but the manifold seems like it might have uneven pressures due to its design. were would the best place for a map be if i was to install on down the road?

i am guna have to ask this cuz you would think you wouldnt have said that /\

but do you understand how boost/pressure acts in a closed system?

pressure is equal through out the entire system its called psi...pounds per square inch because it puts the exact same pressure/force every where within the system

[Jaxx_]

pressure is equal through out the entire system its called psi...pounds per square inch because it puts the exact same pressure/force every where within the system

Wrong. And the best place to put the sensor is right before the throttle body. You should place the air temp sensor there as well.

[dranttna]

i understand what psi is, and also understand how AIRFLOW works while under vacuum and pressure quit well.
thanxks jaxx thats what i was thinking just to get an even reading but im not sure i want it to be were the incoming air threw tb directly hits it since that is were its flowing the fastest and hitting the plenum to basicly split into both sides, but i guess any tuning program i find for this motor woulnt be that precise.
this will be after a bigger turbo and thottle btw

[dranttna]

pressure is equal through out the entire system its called psi...pounds per square inch because it puts the exact same pressure/force every where within the system

this is true for a close system like a compressed air tank, but an engine is far from a closed system since it flows air pretty quickly, boost is just flowing more air than the engine can let though resulting in a positive pressure.

[Tchao]

Did you contact TRM?
I think their tunes are for pre-turbo setups. The MAF reads much different!

We have 2 meets a month, go to azbmw.org