Turbo psi vs Exhaust Back Pressure (EBP) psi - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 01-10-2013, 07:23 AM Thread Starter
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Turbo psi vs Exhaust Back Pressure (EBP) psi

I was wondering how far apart these numbers should be under different conditions and loads and if it means anything? I'm assuming turbo pressure and EBP are chain linked so they should have some sort of healthy relationship when your truck is running how she should. I've only compared at cruising speeds (70-80mph) so I don't have a great base to judge from but those numbers were consistently 3-5 psi apart with the EBP bein the higher number I thing (could be wrong).

Any ideas, thoughts, personal experiences, or comments? I'm no mechanic or mechanical engineer...I'm just a lowly civil engineer who tries to be one!

All y'all who are smarter than me feel free to drop some knowledge. Thanks in advance!


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post #2 of 9 Old 01-10-2013, 09:26 AM
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They should be as close to 1:1 as possible.

08 F350 cc/sb 4X4
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post #3 of 9 Old 01-10-2013, 11:08 AM Thread Starter
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What does it mean if they are not? Clogged EBP sensor?


Sent from my iPhone using AutoGuide.com App

*NEW:
2016 F250 CCSB KR FX4
NL Fab:
---Stage 1 Intake
---EGR shmock off plates
---Flo Pro Exhaust (5" to 6" tip)
---SCT with GH tunes
---Waiting for first Fuel Filter change to install:
---------CCV Mod
---------CTS2 monitor with EGT Probe
Just passed 1,111.1 miles and LOVING IT!


**SOLD:
2010 F250 CC FX4
H&S
AFE Intake
and some other goodies...

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post #4 of 9 Old 01-10-2013, 09:56 PM
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Not sure but if your ebp is completely clogged you will know. Hardly any power and turbo 40 psi when barely on the throttle

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post #5 of 9 Old 01-10-2013, 10:01 PM
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I think mine are different I can't tell the sct I messed up everything is measured in different ways with kpa or psi. At idle it says desired ebp 28 and the actual is 112. Not sure i may have a problem too

01/07 Job 1 F350 H&S Tuned. ARP Studs, AFE 4'' straight pipe, EGR delete with elbow, AFE stage 2 CAI, 6'' lift on 37s, 20x12 Fuel Nuts two piece, Sinister coolant filter, CCV Mod, Projector headlights HID kit
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post #6 of 9 Old 01-10-2013, 10:21 PM
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Just found this on a different site. (My ebp is 15kpa higher then map at idle hope that's ok).
You'll need an accurate pressure gauge for boost and exhaust back pressure. The dash daq provides these readings as such; manifold gauge pressure is the same as actual boost pressure. EBP (exhaust back pressure) is atmospheric pressure + exhaust back pressure. MAP (manifold absolute pressure) is boost pressure + atmospheric pressure. It is easiest to use MAP and EBP as readings, but if you like math, you can use MGP and EBP - atmospheric pressure. The ideal street ratio is approximately 10 psi actual peak exhaust pressure higher than actual boost pressure. For example, If your EBP reads 75 and your MAP reads 65, you're perfect. Assuming an atmospheric pressure of 13 psi, you'd also be perfect having EBP of 75, and MGP of 52. To know your actual atmospheric pressure, look at EBP or MAP with key on, engine off.

01/07 Job 1 F350 H&S Tuned. ARP Studs, AFE 4'' straight pipe, EGR delete with elbow, AFE stage 2 CAI, 6'' lift on 37s, 20x12 Fuel Nuts two piece, Sinister coolant filter, CCV Mod, Projector headlights HID kit
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post #7 of 9 Old 01-11-2013, 11:04 AM Thread Starter
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That's exactly what I was looking for.

SRJD--you are the man. Thanks bud!


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*NEW:
2016 F250 CCSB KR FX4
NL Fab:
---Stage 1 Intake
---EGR shmock off plates
---Flo Pro Exhaust (5" to 6" tip)
---SCT with GH tunes
---Waiting for first Fuel Filter change to install:
---------CCV Mod
---------CTS2 monitor with EGT Probe
Just passed 1,111.1 miles and LOVING IT!


**SOLD:
2010 F250 CC FX4
H&S
AFE Intake
and some other goodies...

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post #8 of 9 Old 01-11-2013, 03:31 PM
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Mine run around 15 to 17 kpa difference between ebp and intake pressure.
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post #9 of 9 Old 02-21-2013, 08:22 AM
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Turbo psi vs Exhaust Back Pressure (EBP) psi

What should the ebp show when the key is on but the engine isn't running? Mine shows 4psi on my mini max. Does anyone know how to see the map pressure on the mini max?


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