Again, Deep sump

[Racer Boy]

Originally Posted by maytag

No, but I DO think that a "better" lubricant is likely to mask more dips in pressure than a "lesser" lubricant. Y'know?

I dunno..... maybe that's naive.

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It can't hurt to have a good oil, that's for sure. But the root problem is still there.

[MaxD]

For what it is worth I run XP9, have an LN deep sump and the oil pressure does vary widely. Pretty much the same as when I ran an X51 only.

Your gauge sampling rate will effect what dips you see. AIM will use 5-10hz for a pressure sensor, don't know about a VDO gauge.

If you do install a deep sump on a car that is run on the street, install some sort of sump guard. You won't regret it.

[jaykay]

Originally Posted by MaxD

For what it is worth I run XP9, have an LN deep sump and the oil pressure does vary widely. Pretty much the same as when I ran an X51 only.

Your gauge sampling rate will effect what dips you see. AIM will use 5-10hz for a pressure sensor, don't know about a VDO gauge.

If you do install a deep sump on a car that is run on the street, install some sort of sump guard. You won't regret it.

I don't think I ever had the wherewithal to catch oil pressure dipping in corners. I think gauge with a preset low level alarm would be what I would have done for track work

[MaxD]

Originally Posted by jaykay

I don't think I ever had the wherewithal to catch oil pressure dipping in corners. I think gauge with a preset low level alarm would be what I would have done for track work

I assume the gauge itself only captures at 1 hz. Very possible that you may miss an outlier pressure event. If it samples at a higher rate it may be buffered to look smooth unless everything goes south.

This is why having data logging can be helpful. I only look at engine related values after the fact, unless an alarm LED goes on I keep charging.

[maytag]

Originally Posted by MaxD

For what it is worth I run XP9, have an LN deep sump and the oil pressure does vary widely. Pretty much the same as when I ran an X51 only.

Your gauge sampling rate will effect what dips you see. AIM will use 5-10hz for a pressure sensor, don't know about a VDO gauge.

If you do install a deep sump on a car that is run on the street, install some sort of sump guard. You won't regret it.

XP9 vs DT40.
Somebody? How does the nomenclature for Driven oils work?

[MaxD]

XP9 = 10W-40
DT40 = 5W-40

DT is the street car formula and XP is race. I assume the difference is in the friction additives and the XP9 costs more.

The Spec box never sees below freezing starts but it does see service above 4000 rpms for 30 minutes often.