Boost levels change

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schroederMP

schroederMP

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Help me out...

When I'm driving on the interstate (truck is already warm and at operating temps) my boost will be setting at around 10 psi (flat ground) and my egts will be hovering around the 700* mark...well about 30-45 minutes into the trip, my boost will drop to about 6 psi and my egts right around the 600* mark?

Why is this happening? Were I drove to has an elevation change of only 100 ft or so. Would that cause it?
 
ramhunter9

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That sounds about right to me .. Higher boost higher EGT
 
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schroederMP

schroederMP

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Yea thats normal... but why would I randomly have a lower boost on the same stretch of highway (flat highway) at the same speed?
 
ramhunter9

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No idea
 
Mopar1973Man

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I typically see about 2-3 PSI boost at about 500-550*F at 55 MPH.

But my boost pressure will wonder up and down depending of load and grade...
 
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schroederMP

schroederMP

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Thanks... its just weird that they will be 1 level at one poit, then another level at another point under the same cercumstance (mph, grade)

I dunno... I was just wondering
 
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Remember that boost pressures and EGT's are also related to air density and weather changes.

Simple changes to humidity can and will make changes like this also.
 
Stangshcky12

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Hm never really put that together lol
Pgage=Psystem-Patmosphere
 
Mopar1973Man

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Or just get a PSIa Gauge... (Pound per Square Inch Atomsphere)... So 14.7 PSI is normal atomsphere and 0 PSIa would be 30" inches of vacuum...

Just another way to look at it...
 
Mopar1973Man

Mopar1973Man

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schroederMP said:
Yea thats normal... but why would I randomly have a lower boost on the same stretch of highway (flat highway) at the same speed?
Click to expand...

Just hit me... Tail wind... Less load on the engine and less fuel being consumed...
 
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