[Fot] synthetic gear lube

Wed Jun 22 10:45:26 MDT 2022

We've found it necessary to run synthetic gear oil in the endurance TR6. We
run 8 and 7 hour races in ChampCar and the gear oil takes a beating.  I was
a 100% conventional GL4 believer until we melted the poly diff bushings.
Synthetic gear oil solved that problem.

Bob Kramer

On Wed, Jun 22, 2022 at 11:13 AM Paul Ricco via Fot <fot at autox.team.net>
wrote:

> P.J.
>
> I know that a lot of people on FOT have had different experiences with
> lubricants and there is not one correct answer for all people.  So I do not
> wish to imply that our way is the only way.
>
> We have been testing oils for the last few years.  We wanted to understand
> how different products and brands worked with our specific car.
>
> We have removed all sythethic and semi-synthetic lubricants from our car.
>
> We have switched back to very high quality conventional mineral based
> lubricants.
>
> Some of the products we are using go back to things that we learned racing
> Porsche cars 35 years ago.  Things that some of the foremost Porsche racing
> experts in the US shared with us over the years.  These are people that
> support many racing winning cars all over the US.  One is an engineer by
> trade.  Our car is much happier with the conventional lubricants.  We chose
> brands and products very carefully.  We research the specs in detail and
> speak to the engineering departments of the companies that produce them.
>
> Our findings are this, cars that were engineered and designed to run
> conventional mineral based oils sometimes prefer them.  The tolerances and
> types of gaskets that were used when our cars were designed pre-date the
> use of synthetic oils in automobiles.  Not to say that synthetics cannot
> work, however we are happier with our car running very high quality
> conventional lubricants.  We have found that the additive packages and
> detergents in modern synthetic are too aggressive for our car.  They were
> causing us more pains than benefits.  We change the oils on a regular
> basis, so aggressive additive packages are not a big benefit for us.
>
> A couple things to consider when choosing them:
>
> 1.  Gear Oil - If you have a limited slip, make sure it has the correct
> additive package for the LS.  If you still have brass in the gearbox or
> diff, make sure the oil does not exclude its use with brass.  This is not
> as simple as just GL-4 or GL-5 specs.  There are a lot of GL-5 spec oils
> that are safe with brass.  The brass issue comes down to other additives.
> Read the label and check with the company that makes it.
> 2.  Engine Oil - High ZDDP content is important
>
> We just got done running pretty hard at BHF in very hot weather.  As many
> as 4 sessions a day with only 15 minute breaks between some of them.  Our
> car was very happy with the conventional products that are in it now.
> Temperatures of the motor and gearbox were down and shifting was very
> consistent throughout all sessions.
>
> Just my experience and thoughts.
>
> Paul Ricco
>
> On Jun 22, 2022, at 9:29 AM, fubog1 via Fot <fot at autox.team.net> wrote:
>
> Yup same here, it makes the sync rings crunchy!
>
> Glen Efinger
>
>
> -----Original Message-----
> From: John H. Hasty via Fot <fot at autox.team.net>
> To: walt at hot-tr6.com <walt at hot-tr6.com>
> Cc: Brad Eells via Fot <fot at autox.team.net>
> Sent: Wed, Jun 22, 2022 10:08 am
> Subject: Re: [Fot] synthetic gear lube
>
> Us three
>
> Sent from my iPhone
>
> On Jun 22, 2022, at 9:21 AM, walt--- via Fot <fot at autox.team.net> wrote:
>
> 
>
> I have a lot of experience using synthetic lubricants in racing engines,
> transmissions and differentials. There are lots of advantages such as the
> differential running cooler etc. however the limited slip probably will not
> function as effectively. With regards to transmissions it has been my
> experience that with synthetic lube installed the syncros do not function
> as effectively and shifts will be slower, you’ll have to double clutch more
> then parts will fail.
> Walter Hollowell
>
> *From:* Fot <fot-bounces at autox.team.net> *On Behalf Of *Aaron Johnson via
> Fot
> *Sent:* Wednesday, June 22, 2022 6:27 AM
> *To:* DAVE HOGYE <dlhogye at comcast.net>
> *Cc:* Brad Eells via Fot <fot at autox.team.net>
> *Subject:* Re: [Fot] synthetic gear lube
>
> i've heard of good l with lightweight shock proof in the transmission as
> well.  Maybe a quick note to Jamie Houseman (racegearbox.com) as he is
> the T50 Guru!
>
> aaron
>
> On Tue, Jun 21, 2022 at 11:26 PM DAVE HOGYE via Fot <fot at autox.team.net>
> wrote:
>
> Same as Brad.
> Dave H.
> > On 06/21/2022 7:00 PM Brad Eells via Fot <fot at autox.team.net> wrote:
> >
> >
> > Redline MT-90 GL-4 for the gearbox.
> >
> > Redline Lightweight Shockproof for the diff.
> >
> > Brad Eells
> > Sent from my iPhone
> >
> > > On Jun 21, 2022, at 6:56 PM, McKearn McKearn via Fot <
> fot at autox.team.net> wrote:
> > >
> > > 
> > > Hi Friends.
> > >   I am looking for recommendations as to which synthetic gear lube to
> use in my GT6?  Transmission is Toyota T50, rear end is GT6 ,would like to
> convert both to synthetic.
> > > Thanks. P.J.
> > > _______________________________________________
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