How is boost read through ecu - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 6 (permalink) Old 08-28-2019, 05:36 PM Thread Starter
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How is boost read through ecu

I'm curious if the boost read off of my edge insight is actual or what the truck thinks it should be? I ask because it doesnt seem to pull as good as I feel it should even when my boost is in the teens when reading from the port...
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post #2 of 6 (permalink) Old 08-28-2019, 06:06 PM
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On the ScanGauge, boost is a calculation of the MAP sensor output minus atmospheric. There is a technique to figure out your atmospheric (because itís different depending on your elevation) and you program the PID so your boost is zero KOEO.


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post #3 of 6 (permalink) Old 08-29-2019, 08:29 PM Thread Starter
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Ok that answers my question, I thought maybe my insight was off a little, apparently not then. The reason for my question was because I cannot get my truck over 14 lbs of boost loaded unloaded or towing 14 is max. Up pipes aren't leaking and from what I can tell intake boots are fine just a little seepage from them and I cant hear any whistles or air from them... my understanding is that stock boost should be at least 16lbs I could be wrong because theres alot of different answers on boost from a factory truck...my buddy seems to think I'm probably low on compression on a cylinder or two, I pass the blowby test but I am unsure if that means anything... I trust your input RT you've always been a wealth of knowledge!
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post #4 of 6 (permalink) Old 08-30-2019, 12:45 AM
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Maximum boost is controlled (to some extent) by the wastegate, which opens to bypass some of the exhaust stream around the turbine wheel. It has a spring as well as the actuator that's controlled by boost pressure from the turbo outlet wye. The actuator pushrod may need to be adjusted.

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post #5 of 6 (permalink) Old 08-30-2019, 10:55 PM
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If that is all the boost your getting you might eating to check for leaks. I get on the 20's with my edge.

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post #6 of 6 (permalink) Old 08-31-2019, 04:04 PM Thread Starter
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Would a leak always make a whooshing sound from the boots? I dont hear anything from under the hood. My turbo and actuator were new a year ago and was properly adjusted and certified, at that point I didn't have my insight so I dont know what boost actually was. When I read on what boost should be some think 14 max is normal and others say they can get into the 20s and that's normal, I'm not tuned I've only got an ais intake I dont know what type of boost these left the factory with...I'm going to try a boost leak test and see if I find anything... i get 14lbs as it sits now at wot unloaded is it worth hooking up my camper and going wot and seeing if it changes or do you guys think I would get it empty wot? I've got slight oil residue from the boots but my understanding is that's normal without doing the ccv mod I've looked at other boots and my truck doesnt appear to be any better or worse that others...
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