MAF SIGNAL ISSUE- AIR TURBULANCE

[xjer22x]

so i just got my car tuned and it was reported to me that due to the bends in my charge pipe and the diameter change, that my MAF reading goes crazy.

the result of this is very rough idle and hard drivability. once the car is in boost i dont seem to have that big of an issue but its more partial throttle and cruising speeds. i have logged it on my phone and it is crazy how much the MAF reading changes.

i was wondering if there was any one that had an idea of how to possibly fix this issue. i understand how bends in piping can cause this but just reaching out to see if anyone has any ideas of what might help this out.

[B.Buster]

post a pic of your intake piping

[xjer22x]

heres a shot of it. i know the picture isnt the best but its the only camera i have.

the charge pipe runs from 3 inches all the from the turbos in the back( its a rear mount setup) up to he front where the coupler is in the picture where it goes to 4 inch where the MAF sits.

the second picture is the actual intake MAF before complete install.

[4xchamp]

I've been experimenting with my maf placement . I have about 9 inches of straight pipe ahead of it and yesterday I noticed it was sitting in the pipe slightly crooked . I modified it's mount and garnered an improvement . I'm scheduled for a dyno tune June 2nd and want everything dialed before I show up . My car has been running pretty well with the emailed tunes Ted sent me .
If you look at the oem set up the maf is right at the begining of the tube close to the air filter . I guess when you change things around there is some trial and error involved .
Can you post some photos and what are your maf readings?

[xjer22x]

this is the logger im using so i know theres alot of info here...

but the orange line is the MAF signal and as you can see the line fluctates a lot. some times up to 80-90 gs it says.

this made it very difficult for speed inc to tune it so they had to tune it very rich because it was very hard to monitor the AFR due to the fluctuation.

[4xchamp]

I'm no expert but it appears your maf could be sunk a little further into the tube . Your mount looks higher than most but that may not be relevent .

[xjer22x]

ill take it off again and re measure it. could be a possibility. thanks for that idea.

[4xchamp]

I'm going to check my readings at idle and let you know .
Who built your turbo? I built my own setup and so far so good but I do suspect my maf is acting screwy although with recent changes driveability is good but my a/f does jump around at light cruise .

[4xchamp]

Originally Posted by xjer22x

ill take it off again and re measure it. could be a possibility. thanks for that idea.

You're welcome , I hope it helps .
I'm going to check my readings now and also measure how high my maf is in relation to the 4" pipe . I wrestled a little getting my turbo together and if I could save a friend some aggravation that would please me immensely .
I need to emphasize I'm no expert . I do have above average mechanical knowledge being in the industry but this is beyond . I just fight every problem till I win .
I'll get back to you shortly .

[xjer22x]

haha yeah im not expert either so i appreciate any and all feedback. every little bit helps.

[B.Buster]

I agree with 4xchamp.Your MAF might not be in far enough to read properly. I had to play around with MAF placement also. You might have to move your MAF (clock it differently)

[xjer22x]

yeah i had mine custom built too, takes a little longer but saves a lot of money. and yeah i just measure compared to the stock intake and it is a little bit higher.

the best way i can describe drivability is it idles rough like it has a big cam, which it has a stock cam. then under slight accel and cruising, at curtain times the car can start bucking which can get a little fustrating. under hard accel it doesnt seem to suffer too much but its makes it very hard to tune with fluctuation like that.

[Ovenmitt]

I have a custom ram air from my foglight port. Turbulence is an issue at part-throttle driving, I actually cap the ram air off for daily driving, and only open it for races/drag strip due to the same thing you're describing. It makes the car buck due to turbulent air which screws with the maf readings. WOT is fine, but at part throttle at speed there is nowhere for the rammed air to go (sealed airbox) and it causes havoc with the maf.

Same issue, but slightly different cause. You might want to try a different intake (or borrow one from a friend to test the problem)

[xjer22x]

i would love to be able to switch with someone but the problem is thats its a twin turbod car so the intake is completely custom.