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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@jsperformancemotoring.com
www.jspmparts.com
https://www.facebook.com/JSPerformanceMotoring/
On Tue, Sep 29, 2026 at 3:20=E2=80=AFPM Mark Cook <mecook635@gmail.com> wro=
te:
> 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 l=
ow
> 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 baffl=
e
> and race oil pickup (with the saucer). Did not push the TR6 very hard, n=
ot
> 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 no=
t
> 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
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
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>
>
>
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<div dir=3D"ltr"><div>Mark,</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0My =
GT6 runs a baffled stock pan with a stock pickup, so it's apples to ora=
nges, 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 press=
ure fluctuates in left-hand turns. There is ample room before the crank thr=
ows hit the oil, that extra oil has never been a problem for me.=C2=A0 I su=
spect the longer throws of the 2.5L crankshaft also have plenty of room.</d=
iv><div><br></div><div>When watching my in car videos, I see the oil pressu=
re gauge needle still flickers occasionally during a left turn after a hard=
braking zone, but with the Accusump backfeeding, it never indicates pressu=
re nearly as low as what you are reporting.=C2=A0 I'm still seeing 50 p=
si during a momentary drop.=C2=A0 70 to 80 psi at peak revs (8,000 rpm) wit=
h hot oil.</div><div><br></div><div>How is your Accusump plumbed into the e=
ngine?=C2=A0 I have seen Accusumps with an electronic valve that doesn'=
t open until some preset pressure drop, those seem less helpful in this sor=
t of situation. I prefer the manual valve that's wide open whenever the=
engine is running.</div><div><br></div><div><br></div><div><br></div><div>=
<div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signatur=
e"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D=
"ltr"><div dir=3D"ltr"><div>Jason Sukey</div><div><span></span><span></span=
>JS Performance Motoring, LLC<br></div><div>440.984.7720</div><div><a href=
=3D"mailto:jason@jsperformancemotoring.com"; target=3D"_blank">jason@jsperfo=
rmancemotoring.com</a><br></div><div><a href=3D"http://www.jspmparts.com"; t=
arget=3D"_blank">www.jspmparts.com</a></div><div><a href=3D"https://www.fac=
ebook.com/JSPerformanceMotoring/" target=3D"_blank">https://www.facebook.co=
m/JSPerformanceMotoring/</a><br></div></div></div></div></div></div></div><=
/div></div></div><br></div><br><div class=3D"gmail_quote gmail_quote_contai=
ner"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Sep 29, 2026 at 3:20=E2=
=80=AFPM Mark Cook <<a href=3D"mailto:mecook635@gmail.com";>mecook635@gma=
il.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex"><div dir=3D"ltr"><div>All,</div><div><br></div><div>Back in January, =
installed a newly built back up engine in the TR6 (while Jason Sukey was re=
-building my original engine).=C2=A0 Finally, ran some break-in laps back i=
n May at lower RPMs (one session at <5,000, then a second session=C2=A0a=
t about ~6,000rpm).=C2=A0 Engine ran well, but did not really push it hard.=
</div><div><br></div><div></div><div>Last week at VIR, pushed the car a lit=
tle harder (both in rain and dry track).=C2=A0 Moving through T3 and T4 (le=
ft hand turns), I experienced very low oil pressures:=C2=A0=C2=A0</div><div=
>T3 -=C2=A0 30.1psi / 3954rpm / 60.1mph and=C2=A0</div><div>T4 -=C2=A0 24.8=
psi / 3643rpm / 46.6mph.=C2=A0=C2=A0</div><div><br></div><div>At similar rp=
ms,=C2=A0</div><div>T12 (RH), 52.4psi / 3525rpm / 45.9mph.=C2=A0</div><div>=
<br></div><div>I have a Racetorations oil sump (take 1.6qts more than stock=
), race baffle and race oil pickup (with the saucer).=C2=A0 Did not push th=
e TR6 very hard, not over 7,000rpm.
</div><div><br></div><div>Clearly the oil must be sloshing to the right sid=
e of the pan during the slow left hand turns.=C2=A0 The Racetorations picku=
p is the saucer kind which is centered in the sump.</div><div><br></div><di=
v>Showing good pressure at around 70+psi at near 6,800rpms in straights and=
2qt accusump when idling, 80psi.</div><div><br></div><div>We are going to =
drain, measure and refill. Thoughts, other than simply not enough oil in th=
e system?</div><div><br></div><div>The math:</div><div>Stock TR6 system -=
=C2=A0 =C2=A0 =C2=A05.4qts</div><div>Racestorations=C2=A0Sump=C2=A0+1.6qts<=
/div><div>Oil lines=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0+0.5qts (external oil feed)</div><div>Oil cooler=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0+0.5qts</div><div>Accusump=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0+2.0quts</div><div>Total=C2=A0 =C2=A0 =C2=A0 =
=C2=A010.0qts</div><div><br></div><div>Thanks,</div><div><br></div><div>Mar=
k Cook</div><div><br></div><div><br></div></div>
_______________________________________________<br>
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/a><br>
<br>
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<br>
<br>
</blockquote></div>
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