Oil pressure drops 10psi under boost

Chevy1925

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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Phoenix Az
So towing steves truck back i noticed something i had not seen before. with the truck in 5th gear, TCC locked jsut cruising down the road my oil pressure showed about 50 psi. If i rolled into the throttle some and didnt let it down shift, when the boost would come up my oil pressure would drop to 40 psi. its the only time i would notice it drop. no fuel in oil and idle pressure is at 20-25psi. i dont think its much to worry about but its triggered my curiousity. Ive only noticed it under a large load (towing). anyone seen the same thing with twins? never did that before with the stocker turbo only
 
McRat

McRat

Diesel Hotrodder
Aug 2, 2006
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Your pistons are oil-cooled.

When the engine is at full load, your oil thins due to the heat.

Your oil pressure gauge can work as a poor-man's-pyro.

If you don't remember it happening with the stock turbo, it's probably just because you never noticed. It happens on all our trucks.
 
tractor

tractor

Member
Mar 19, 2009
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Spring Creek,NV
What would be the upper limit on oil temp. If anyone has some sort of ball park number.

Sent from my SAMSUNG-SGH-I897 using Tapatalk
 
Chevy1925

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,214
5,036
113
Phoenix Az
McRat said:
Your pistons are oil-cooled.

When the engine is at full load, your oil thins due to the heat.

Your oil pressure gauge can work as a poor-man's-pyro.

If you don't remember it happening with the stock turbo, it's probably just because you never noticed. It happens on all our trucks.
Click to expand...

Ah I see. Pressure stays pretty consistant even under a big load, jsut notice the little fluctuation. I was runnin her pretty damn hard when i noticed it though :D. thanks pat
 
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