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[Z06] What psi are you sitting at?

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Old 08-31-2014, 10:29 AM
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Tommyxgun
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Default What psi are you sitting at?

Recently drove a family members c5 with ls6 swap, and his car runs around 42-45psi at 70mph. Looked at mine, and I'm 55psi at 70mph. We have basically the same mods. Idling, car fully warmed up after I drive, I sit around 42psi. Why is mine higher? Should I be concerned?
Old 08-31-2014, 06:40 PM
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Speed 70mph
6th gear
Coolant temp 201

Oil psi... 55
Old 08-31-2014, 10:14 PM
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I'm at 11-12psi, ohhh we're talking about oil pressure... you're fine, probably have a shimmed or higher pressure pump
Old 08-31-2014, 10:25 PM
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Haha. Thanks!



Originally Posted by neutron82
I'm at 11-12psi, ohhh we're talking about oil pressure... you're fine, probably have a shimmed or higher pressure pump
Old 08-31-2014, 10:31 PM
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racebum
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stock is 30psi/30w give or take a couple pounds at idle and operating temp.
Old 09-01-2014, 01:35 PM
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Chuck A
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mine is a regular c5 no mods and at 75 its at 50 psi is that ok? really worried thanks, i am at 5th gear
Old 09-01-2014, 02:16 PM
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skyavonee
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Originally Posted by racebum
stock is 30psi/30w give or take a couple pounds at idle and operating temp.
Yup, that's what mine read with the oil in the 200-210 deg F range.

After the cam job and shimmed oil pump, it was more like 40 psi.
Old 09-01-2014, 02:26 PM
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skyavonee
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Originally Posted by Tommyxgun
Recently drove a family members c5 with ls6 swap, and his car runs around 42-45psi at 70mph. Looked at mine, and I'm 55psi at 70mph. We have basically the same mods. Idling, car fully warmed up after I drive, I sit around 42psi. Why is mine higher?
For starters, if he has a Coupe or Vert, then he has different gearing than your Z. Oil pressure is dependent upon RPM - not road speed - and you will be at a higher RPM than him for any given gear and speed.

And as previously stated, with your 42psi idle, you probably have a shimmed or aftermarket oil pump.
Old 09-02-2014, 09:14 PM
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BigBirdLS1
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Originally Posted by Chuck A
mine is a regular c5 no mods and at 75 its at 50 psi is that ok? really worried thanks, i am at 5th gear

50psi at 75? you are just fine don't worry about it.
Old 09-02-2014, 10:17 PM
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Originally Posted by racebum
stock is 30psi/30w give or take a couple pounds at idle and operating temp.
Same here. Around 40psi at 70 mph
Old 09-03-2014, 08:37 AM
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Chuck A
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Originally Posted by BigBirdLS1
50psi at 75? you are just fine don't worry about it.
great thanks
Old 09-04-2014, 12:51 PM
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Here's mine:

70 MPH
6th gear
70 degrees outside
43 PSI oil pressure
214 oil temp and on it's way down
Old 09-04-2014, 01:02 PM
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Originally Posted by skyavonee
Oil pressure is dependent upon RPM - not road speed
apparently no one else is grasping this... see what the oil pressure is at 70mph in 6th gear as opposed to 70mph in 2nd gear
Old 09-04-2014, 01:07 PM
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Originally Posted by neutron82
apparently no one else is grasping this... see what the oil pressure is at 70mph in 6th gear as opposed to 70mph in 2nd gear
Is that what the OP was asking?
Old 09-04-2014, 01:20 PM
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what I'm trying to say, and what skyavonee stated, is that the speed is irrelevant and rpm is what is going to determine if your oil pressure is higher or lower... 6th gear at 70mph is about 1800rpm whereas 2nd gear at 70mph is almost redline, there will be a big difference in the pressure
Old 09-04-2014, 01:59 PM
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Originally Posted by neutron82
what I'm trying to say, and what skyavonee stated, is that the speed is irrelevant and rpm is what is going to determine if your oil pressure is higher or lower... 6th gear at 70mph is about 1800rpm whereas 2nd gear at 70mph is almost redline, there will be a big difference in the pressure


However, as oil temps go up (with a greater engine load), oil viscosity goes down and with it, oil pressure.
Old 09-04-2014, 02:04 PM
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I am ususally 40-55ish
Old 09-05-2014, 12:26 PM
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Originally Posted by envyz06
I am ususally 40-55ish
What speed and what gear?

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