Join Date: Dec 2008
Thanked 112 Times in 85 Posts
Sorry to tell you this, but 1350 psi at 1660 rpm tells us absolutely nothing. Reason being is that the high oil pressure is not based entirely on RPM's. Throttle position, engine load, tuning, etc will determine what your oil pressure is (or should be), and it's up to the pump to supply the oil demanded.
1350 psi at 1660 rpm is completely normal, especially if you are cruising and not putting a load on the engine. That's probably all the tuning is calling for anyway, so the rest is going to bleed out via the IPR.
The two things we can tell over the internet regarding oil pressure is 1) idle, and 2) WOT full blast. At idle, your oil pressure should be around 500 or so PSI (slightly above or below is fine, as long as the truck idles fine). At WOT and with your pump setup, your oil pressure should try to maintain close to 2800-3000 psi on either stock tuning, or even with your TS chip on any setting.