REWARD...6th post down.

Ok so after alot of new parts and research i am still having the same problem. I am only getting 5-6 pounds ofboost. Both turbos are in great shape with no oil leaks and little to no shaft play. I amnot getting any codes and the car runs great....aside from being underpowered. I will first list parts i have replaced or tested
1. I swapped my ecu from my brothers 00 s4. no change
2. replaced both diverters with aftermarket
3. replaced N75
4. replaced both upstream 02 sensors (dealer confirmed both were reading hard fault)
5.punched both pre-cats, on suspicion the cats wereinternally dameged. both were good.
6. I havepressurized the system and the system holds charge...then slow trickles down. I'm assuming that is normal.

Now i have an obd2 scanner but it's not like vag-com and simply shows me codes, if any.
I broke down and took the car to the dealer something i despise. I was told that the car had 2 bad 02 sensors, and both EGT sensors were reading intermittent failures. I have replaced the 02 sensors but still have yet to change the EGT sensors. Could egt sensors cut boost?
does anyone have any more suggestions? tests, parts...anthing.

 

Check the tbb to see if its torn, or use the search button to find a list of things that cause you to lose boost

 

As stated, i pressurized the system.No leaks, When i purchased the car i installeda new tbb boot.
I searched the forum high and low...The problem is usually resolved with the repairs i have undergone.
Does anyone know if the intermittent failures with with the Eghaust Gas Temp. Sensors would pull my boost?
They're awful expensive and i would hate to replace them if that couldnt be the problem.

 

im haveing the same problim!
New DV
APR BI pipe
No leaks in the bay
The only code is the evap -deveation.

Does your car take a long time to build the boos too?

 

It doesnt take to long to build...especially now that i have punched the pre-cats. Prior to doing that, It didnt really take to long, but Its only boosting to 5-6 lbs so not really much boost to build.

 

Wow no one has anything?
heres what im gonna do. First im going to replace the EGT sensors...if that doesnt fix the problem than, Im going to give a $20 reward to the person that diagnoses the fix. Im an honest guy and i will be glad to paypal the $20 to the SUPER TECHNICIAN that resolves this issue.
You have my word on that.
Also: if you like, your more than welcome to call 518-368-7150....anyone living around the Albany NY area, Your more than welcome to take a look at the car (of course the reward would increase in that case!)
Joe

 

Do you still have your brother's ECU installed?

 

this wouldn't be a boost issue, but you could have misfires? change your plugs and maybe coilpacks too

 

No i dont have my brothers ecu installed anymore. I removed it shortly after the test drive.

 

all six coil packs have been changed within the last 1.5 years. I havent inspected the plugs but the car runs and idles like a dream. I dont feel any type of misfire.