Boost Leak Problems

[OneSlo]

I have a 2016 Taurus SHO. When first getting tuned I held 18psi all the way through the rpm range. Now I hold between 12 to 14psi at the top of any gears. WGDC is still only 55% with a fall off from mid to high 80%. Wondering if anyone has had the same experiences? Is it turbos or could I be experiencing a leak since the wastegates aren’t trying to make up for it.

 

[yaycandy]

Fun part of owning a twin turbo. Always checking all the piping. Pull out the recirc valves and pull on them a bit to see the orange rubber diaphragm make sure they aint tore. Same with plastic hoses if you still got them. They can split and be hard to see. Sometimes they may have some oil on the pipe where the crack is

 

[OneSlo]

Fun part of owning a twin turbo. Always checking all the piping. Pull out the recirc valves and pull on them a bit to see the orange rubber diaphragm make sure they aint tore. Same with plastic hoses if you still got them. They can split and be hard to see. Sometimes they may have some oil on the pipe where the crack is

I figured I would start with a boost leak test early next week and see what I can find. No obvious issues just car feels like a slouch getting into boost vs how it was before which is what lead me to think it’s either a leak somewhere or the turbos. Thank you for the advice it is much appreciated

 

[76FoMoCo]

Are you GH auto octane tuned? What is your OAR?

 

[ridered74]

Do a wide open throttle data log, then look at your wastegate duty cycle. If it isn't at 100% you can skip wasting time looking for a boost leak. If it is at 100% normal culprit is the noisemaker connection at throttle body, but usually those don't get so bad to drop that much boost.

 

[OneSlo]

Are you GH auto octane tuned? What is your OAR?

Yeah I am GH auto octane and my OAR is -0.96 right where it should be

 

[OneSlo]

Do a wide open throttle data log, then look at your wastegate duty cycle. If it isn't at 100% you can skip wasting time looking for a boost leak. If it is at 100% normal culprit is the noisemaker connection at throttle body, but usually those don't get so bad to drop that much boost.

Could you possibly elaborate what do you mean don’t waste my time looking for a leak. You mean turbos are bad? I thought wastegates should never be 100 duty cycle?

 

[ridered74]

Could you possibly elaborate what do you mean don’t waste my time looking for a leak. You mean turbos are bad? I thought wastegates should never be 100 duty cycle?

If you have a boost leak, your wastegates will be at 100% because the turbos are working non stop trying to achieve the desired boost.

If they aren't at 100% a boost leak is not your problem.

 

[76FoMoCo]

Your wg duty cycle will tell the tell. 100% all the way through a 3 gear pull will be a boost leak. If not building 15 to 17 psi ait2. This is the max for the stock turbos.

 

[kryptto]

I dont know how cross posting to another site - however on the HP Tuners site this thread might be useful.

SHO / EcoBoost HPT Tuning Guides - Page 8

Here's what I've been working on for the past few weeks. It's not to be taken as 100% gospel, but it is based on countless hours of logging and experimentation, and is intended mainly to catalyze the sharing of tuning info related to the EcoBoost platform. The tuning guide provides a basic...

forum.hptuners.com

The guy Metro indicates there is a cap on the throttle body that can cause issues. I also have heard that the "noise maker" can be an issue - take a read.