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WOT oil pressure at 40....

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Old 09-22-2015, 11:11 PM
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Default WOT oil pressure at 40....

after driving around and racing on the highway at least 6 times my oil pressure at WOT reads 40 PSI

is this bad, because it seems not bueno!
Old 09-23-2015, 05:50 AM
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Verify with a mechanical gauge before making assumptions. It could be that low, but it also could be a wonky sender.
Old 09-23-2015, 06:00 AM
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yes,verify its accurate first unless theres other symptoms.
Old 09-23-2015, 08:22 AM
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Is it a problem if it is actually 40?

And it reads higher than 40 before it's super hot

Also I had another ls1 with 100000 less miles and OP was always good
Old 09-23-2015, 09:00 AM
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Deleted, need more morning coffee...

Last edited by thunderstruck507; 09-23-2015 at 03:30 PM.
Old 09-23-2015, 09:01 AM
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I've always used as a basic rule of thumb is minimum 10-psi per 1000 rpm. So, if you're definitely getting 40-psi at 6K for realsies, then yes, I think that's a concern. LOL, just saw thunderstruck with a different rule of thumb. Our thumbs must not match...

If you're talking WOT, but in 4th at 30mph, then it's no big deal at all.

Last edited by Darth_V8r; 09-23-2015 at 09:03 AM. Reason: got treed by thunderstruck!!!
Old 09-23-2015, 03:31 PM
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only gets this way on my gauge after getting the oil thinned out by being really hard on it
Old 09-24-2015, 05:56 PM
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That could indicate you need to run thicker oil, but then the whole debates starts up. I'm assuming your motor forgot what stock looked like, so you might want to talk to some of your parts vendors for their recommendations.

Something else that might be worth checking - a bit of a long shot, but easier than an oil pump - is your PCV. If you are overdrawing vacuum on your crank case, that can cause lower oil pressure.

When you rev, does your oil pressure dip and then recover, or just climb with RPM's? if it dips, and you can verify with a mechanical gauge, your pump is probably going out
Old 09-25-2015, 07:48 PM
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Originally Posted by Darth_V8r
That could indicate you need to run thicker oil, but then the whole debates starts up. I'm assuming your motor forgot what stock looked like, so you might want to talk to some of your parts vendors for their recommendations.

Something else that might be worth checking - a bit of a long shot, but easier than an oil pump - is your PCV. If you are overdrawing vacuum on your crank case, that can cause lower oil pressure.

When you rev, does your oil pressure dip and then recover, or just climb with RPM's? if it dips, and you can verify with a mechanical gauge, your pump is probably going out
It does dip and recover when oil is hot, 215,000 miles
Full exhaust. Ls6 intake SLP lid, needs a tune though
Old 09-25-2015, 11:14 PM
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Originally Posted by Mappinsj
It does dip and recover when oil is hot, 215,000 miles Full exhaust. Ls6 intake SLP lid, needs a tune though
I would want someone like KCS or Paul Bell to chime in, but when I see oil pressure initially dip when revving and then catch back up, I start oil pump shopping.
Old 09-27-2015, 01:35 PM
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Originally Posted by Darth_V8r
I would want someone like KCS or Paul Bell to chime in, but when I see oil pressure initially dip when revving and then catch back up, I start oil pump shopping.


Got that right.



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