Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - Max power for factory drivetrain and engine internals

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Quote:

Originally Posted by solidONE (Post 1215578)

You have not gone FI with your car, correct? Also the pressure dropping with the 0w-20 is under normal driving conditions and temps or were you wringing out the car/motor?

Correct, I am NA.

Both.

Quote:

Originally Posted by Dave-ROR (Post 1217002)

Correct, I am NA.

Both.

I'm assuming you only started taking measurments of oil temps and pressure after the oil cooler was installed. Also assuming that this pressure drop will also happen on a bone stock engine running 0w-20, and running you car like this on the track is probably not a good idea.

Quote:

Originally Posted by Sportsguy83 (Post 1213866)

So I have the Innovate Oil Pressure/ Oil Temperature in one gauge. It has logging capabilities. Went ahead and did several logs from 2K RPMs to 5-7K Rpms.

Including WOT, full boost, partial throttle, very light throttle, cruising.

ALL of the time, the oil pressure graph NEVER drops one PSI while increasing RPM. It looks exactly as expected a line continuously going up. I will post up pics when I trim it as the whole log was 18 minutes.

Again, it might be true its variable drive, BUT it does not appear to be loosing pressure along any RPM range.

EDIT: I'm using Motul 8100 0w-30 Oil.

The guy on the AE86 forum didn't say oil pressure drops with rpm in the torque dip, he says the rate of increase isn't constant as the pump is geared to a variable acelleration with rpm unlike a conventional oil pump.
Maybe he is FOS but usually where there is smoke there is fire, been enough rod bearing failures with FI to look at the oil pump.

Actually dropping oil pressure at high rpm as reported by Dave is obviously a more serious issue, probably a warranty issue. Mine doesn't do this even with 0w20.

Quote:

Originally Posted by regal (Post 1221503)

When you see a linear increase of oil pressure across the RPM band, the rate of increase is constant . :w00t:

Quote:

Originally Posted by Sportsguy83 (Post 1221505)

When you see a linear increase of oil pressure across the RPM band, the rate of increase is constant . :w00t:

Agreed, but Dave's report really is important info. Its sounds like to get a linear increase we need to use a 30 weight ?

Quote:

Originally Posted by regal (Post 1221587)

Agreed, but Dave's report really is important info. Its sounds like to get a linear increase we need to use a 30 weight ?

Might be entirely possible as I do run a 30 weight.

Quote:

Originally Posted by Sportsguy83 (Post 1221591)

Might be entirely possible as I do run a 30 weight.

Yeah....30 weight sounds nice.

http://cdn1.cdnme.se/cdn/7-2/1629542...5_69096771.jpg

Quote:

Originally Posted by regal (Post 1221503)

The guy on the AE86 forum didn't say oil pressure drops with rpm in the torque dip, he says the rate of increase isn't constant as the pump is geared to a variable acelleration with rpm unlike a conventional oil pump.
Maybe he is FOS but usually where there is smoke there is fire, been enough rod bearing failures with FI to look at the oil pump.

Actually dropping oil pressure at high rpm as reported by Dave is obviously a more serious issue, probably a warranty issue. Mine doesn't do this even with 0w20.

I believe @Dave-ROR only started to watch his oil pressures after he installed the oil cooler, so the pressure drop using 0w-20 may be due to extra oil passages from the added cooler assembly.

The oil pressure should not be linear or constant. It's designed to build pressure fast until it hits the pressure relief, and dumps excess oil to maintain the pressure set via the spring in the pressure relief valve.

So if the pressure relief is set to 80 psi it will say hit that by 3500 RPM and then the rest is bypassed until the flow of the oil pump cannot keep up at high RPM. If you see pressure drop, it means the oil pump cannot keep up with oil flow demands. Often people will shim the pressure relief but this will not fix a flow issue at high RPM.

Oil temperature and oil viscosity are the culprits here at high RPM pressure loss. A quick fix is a slightly higher viscosity oil or a more thermally stable oil.

Thanks,
Phil Grabow