[Fot] TR6 Oil Pressure During Race Conditions

[JS Performance Motoring, LLC]

Mark,
         My GT6 runs a baffled stock pan with a stock pickup, so it's
apples to oranges, but I find that running the oil level about 1/2" above
the "full" line on the stock dipstick helps reduce how often the oil
pressure fluctuates in left-hand turns. There is ample room before the
crank throws hit the oil, that extra oil has never been a problem for me.
I suspect the longer throws of the 2.5L crankshaft also have plenty of room.

When watching my in car videos, I see the oil pressure gauge needle still
flickers occasionally during a left turn after a hard braking zone, but
with the Accusump backfeeding, it never indicates pressure nearly as low as
what you are reporting.  I'm still seeing 50 psi during a momentary drop.
70 to 80 psi at peak revs (8,000 rpm) with hot oil.

How is your Accusump plumbed into the engine?  I have seen Accusumps with
an electronic valve that doesn't open until some preset pressure drop,
those seem less helpful in this sort of situation. I prefer the manual
valve that's wide open whenever the engine is running.



Jason Sukey
JS Performance Motoring, LLC
440.984.7720
jason at jsperformancemotoring.com
www.jspmparts.com
https://www.facebook.com/JSPerformanceMotoring/


On Tue, Sep 29, 2026 at 3:20 PM Mark Cook <mecook635 at gmail.com> wrote:

> All,
>
> Back in January, installed a newly built back up engine in the TR6 (while
> Jason Sukey was re-building my original engine).  Finally, ran some
> break-in laps back in May at lower RPMs (one session at <5,000, then a
> second session at about ~6,000rpm).  Engine ran well, but did not really
> push it hard.
>
> Last week at VIR, pushed the car a little harder (both in rain and dry
> track).  Moving through T3 and T4 (left hand turns), I experienced very low
> oil pressures:
> T3 -  30.1psi / 3954rpm / 60.1mph and
> T4 -  24.8psi / 3643rpm / 46.6mph.
>
> At similar rpms,
> T12 (RH), 52.4psi / 3525rpm / 45.9mph.
>
> I have a Racetorations oil sump (take 1.6qts more than stock), race baffle
> and race oil pickup (with the saucer).  Did not push the TR6 very hard, not
> over 7,000rpm.
>
> Clearly the oil must be sloshing to the right side of the pan during the
> slow left hand turns.  The Racetorations pickup is the saucer kind which is
> centered in the sump.
>
> Showing good pressure at around 70+psi at near 6,800rpms in straights and
> 2qt accusump when idling, 80psi.
>
> We are going to drain, measure and refill. Thoughts, other than simply not
> enough oil in the system?
>
> The math:
> Stock TR6 system -     5.4qts
> Racestorations Sump +1.6qts
> Oil lines                       +0.5qts (external oil feed)
> Oil cooler                     +0.5qts
> Accusump                    +2.0quts
> Total       10.0qts
>
> Thanks,
>
> Mark Cook
>
>
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