[Fot] TR6 Oil Pressure During Race Conditions
Mark Cook
mecook635 at gmail.com
Tue Sep 29 20:44:28 MDT 2026
Oh, by the way, my accusump is plumbed to flow in between the oil cooler
and the external oil manifold. The backflow/check valve is between the
accusump line and the oil cooler.
Thanks again!
Mark Cook
On Tue, Sep 29, 2026 at 10:26 PM Mark Cook <mecook635 at gmail.com> wrote:
> Scott, Jason, Bob and Mike,
>
> Thanks for the quick responses. Scott - I have both the newer
> Racetorations baffle and oil pickup in the second link. I also have an
> oil low pressure light in front of me set at 30psi, which is what alerted
> me hen on the track. So, in summary, three things to check:
>
> 1. Oil level - try "over filling" by 1/2" over fill line or 1 full quart
> 2. Accusump automatic valve - check settings or replace with manual valve
> (automatic valve may not be opening soon enough)
> 3. Replace the oil pan baffle with a different make if the above does not
> work.
>
> Much appreciated! Will keep you posted. Hope to see you all at VIR in
> March for the Wild Hare. If the planets align, I will be there too.
>
> Regards,
>
> Mark Cook
>
> On Tue, Sep 29, 2026 at 4:36 PM Scott Janzen <sjanzen at me.com> wrote:
>
>> Hi, Mark, another not-quite-the-same story, but I also run a GT6 with a
>> stock - now baffled oil pan and an accusump. My accusump is plumbed right
>> into the block - directly above the stock oil filter opening there’s a hole
>> in the block that is filled in with some soft metal from the factory. That
>> was drilled out, tapped and has an AN -12 (?) hose that connects to the
>> accusump on the passenger compartment floor. Like Jason, I just have a
>> manual lever/ball valve right on the tank- open that up before I fire the
>> engine, close it before I shut it off. I can reach it easily when I’m
>> sitting in the car. I also have a big red autometer pro-lite on top of the
>> dash, aimed at me, which goes on any time the pressure drops below 30 or 40
>> lb (been so long since I installed it I don’t remember what the pressure
>> switch is at). It serves two purposes - when I turn on the ignition switch,
>> it lights up until I open the accusump and the pressure builds. Second, I
>> don’t need to be watching my gauge while racing - if that light goes on, I
>> immediately know something is wrong, big time, and can shut off the engine
>> hopefully before I ruin it and/or oil the track.
>>
>> I run a stock pump, the baffles divide the pan into quarters and have a
>> few holes punched in them to let the oil move around but not too much.
>> Loose fit at the bottom of the pan. Again, like Jason, I also run the oil
>> level about 3/8 -to- 1/2” above the top fill mark as I find the oil
>> pressure does drop slightly if it’s below the top fill mark.
>> My full chat oil pressure at the Glen this weekend was about 70-75 lb
>> (this engine has about six events on it) - 60 lb cold at idle, maybe 50lb
>> hot at idle. I do not notice any fluctuations on turns.
>> I think my full fill is about 7.5 quarts starting with a drained
>> accusump, but not sure. BTW- I always use an oil pressure primer tank when
>> I change the oil, start the engine, open the accusump to pressurize it
>> (partially - don’t want the oil pressure to drop as it fills up), then
>> adjust the fill level at the dipstick. That way, any time I start the
>> engine after that I can pre-oil it with the accusump.
>>
>> I wonder if your baffle is the issue? If this is it, I don’t think it is
>> doing much good.
>> https://www.racetorations.co.uk/product/aluminium-sump-baffle-plate-tr5-6/
>> On the other hand, I don’t see any issues with this one. Not sure what
>> the saucer pick-up really does for the engine, though. Might even keep oil
>> from getting to the intake if it is too close to the bottom of the pan.
>> https://www.racetorations.co.uk/product/track-day-competition-oil-pump-complete-kit-tr5-6/
>> not sure which one you have.
>> Good luck, let us know what you find out. An accusump is cheap
>> insurance!
>>
>> Scott Janzen
>>
>> On Sep 29, 2026, at 3:41 PM, JS Performance Motoring, LLC <
>> jason at jsperformancemotoring.com> wrote:
>>
>> 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 <(440)%20984-7720>
>> 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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