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Measured exhaust back pressure today

Started by Gray Brick, June 25, 2016, 11:44:14 PM

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Gray Brick

Today I installed a pressure sensor in place of my bank 2 O2 sensor.

I was surprised see a peak of 15psi in the exhaust with a peak boost of 21.

This is with a tune, meth, and 3" catless downpipes.
The rest of the exhaust is stock.

I think I will be installing a 2.5" X-pipe in place of my 3rd cat to lower this back pressure for hopefully a little more power.




2013 Ecoboost Ford Flex
AJP Tune (ATP+2) in progress , Livernois HPFP, 3 Bar MAP, UPR Catch Can, 100% Methanol w/ braided steel lines, 3" Downpipes -->2.5" X-pipe --> 2.5" Magnaflow exhaust, 2.5" air inlets to each turbo with cone filter, Custom water to air intercooler with chiller
275/40-20 Front 315/35-20 Rear Tires
---12.419ET/112.43MPH @ 5150 lbs in the 1/4---

AJP turbo

That's pretty cool...Wonder how much your exhaust mod will help.....Although I think one of the best things to know would be the pressure ratio...Would be awesome to know what the pressure is in the exhaust manifold before the turbo

I would love to know if we are approaching the dreaded 2:1 ratio at 15 pounds of boost
SCT Dealer/Custom Calibrator                        
Specializing in 3.5 Ecoboost   
Remote/email custom tuning including E85 blends 
Authorized retailer for all SCT devices. 
 
Former:2014 PP SHO
3 bar 93 tune, Airaid, Stainless Works non catted DP's  
405whp/520tq
Dyno
     
Current:2016 F150 2.7 Ecoboost
Tuning in progress

Gray Brick

Any suggestions on tapping into this?
2013 Ecoboost Ford Flex
AJP Tune (ATP+2) in progress , Livernois HPFP, 3 Bar MAP, UPR Catch Can, 100% Methanol w/ braided steel lines, 3" Downpipes -->2.5" X-pipe --> 2.5" Magnaflow exhaust, 2.5" air inlets to each turbo with cone filter, Custom water to air intercooler with chiller
275/40-20 Front 315/35-20 Rear Tires
---12.419ET/112.43MPH @ 5150 lbs in the 1/4---

Gray Brick

FYI...

The GTR stock back pressure is 5-6 psi max. (Mine is almost triple)
With a more free flowing exhaust it usually runs in the 2-3 psi range.

2013 Ecoboost Ford Flex
AJP Tune (ATP+2) in progress , Livernois HPFP, 3 Bar MAP, UPR Catch Can, 100% Methanol w/ braided steel lines, 3" Downpipes -->2.5" X-pipe --> 2.5" Magnaflow exhaust, 2.5" air inlets to each turbo with cone filter, Custom water to air intercooler with chiller
275/40-20 Front 315/35-20 Rear Tires
---12.419ET/112.43MPH @ 5150 lbs in the 1/4---