[Fot] Gt6 differential failure

[Scott Janzen]

so, while I respect the need proper operating temps, if the failure experienced is not bearing failure, but simply gear teeth breaking off under load, would lower temps help?  
I run Redline synthetic. 

On Jul 13, 2015, at 2:32 PM, Peter Vucinic wrote:

Get the oil temp down and use full synthetic.
I did much testing on my road going TR4 diff. Even a road car, at highway speed cruising, the oil temp is 180-200F.
With the diff ‘tucked up’ and limited air flow. You are starting with a problem before you start!
 
 
"You can Make a Small Fortune From Motor Racing. As long as You Started With A Lage Fortune!"
Kind Regards
Peter Vucinic
TR4 - TR7 V8 - Spitfire MkII
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From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Scott Janzen
Sent: Tuesday, 14 July 2015 12:20 AM
To: Jason Ostrowski
Cc: 'Friends of Triumph' Triumph
Subject: Re: [Fot] Gt6 differential failure
 
thanks, Jason - yes, I was banging through the gears, and there's now a steep 150' +/- DROP at this track, downhill turn, where I was in second gear at 7,000 RPM, first accelerating, then letting it slow me down as I approached the sharp right to the uphill climb.  I'm sure that did not do the diff any good.
 
Somehow the idea of putting a Subaru diff in this car does not feel very "vintage".
 
Question - has anyone checked the oil temp, and would cooling make a difference?  I do run Redline 75-85 gear oil.
 
I will report back and send carnage photos when I get it out.
 
On Jul 13, 2015, at 10:12 AM, Jason Ostrowski wrote:
 
I agree that it is consumable.
A change to something different would seem to lead to a redesign of all the parts that mate to it and that could turn into a whole new set of other related projects.
Likely a costly and complex endeavor to say the least.
Knowing you, I assume you are using a quality oil already as Steve recommends.
I notice you are racing faster lately and seem to be doing great with the car.
 
Begin Public Service announcement to all FoT...
 
That being said, (especially the faster you go) don't forget to remind yourself regularly about how you need to treat the drivetrain.
Perhaps most importantly on this issue is careful driving with a constant focus to smooth transition between the gears.
And really important is super smooth take-offs.
I'm lucky to have John Reed (best GT6 racer of all time) at the track with me most of the time.
He is never afraid to remind me of this.
And does so on a regular basis when I'm leaving the grid.
Even after all these years of coaching he will still often yell at me through my helmet prior to taking off.
something like....
 "Ride that F$#&%ng clutch baby!!"
or "Easy take off".
Wisdom I'm not afraid to admit I need to be reminded of in a tense moment taking off to hit the track.
One slip of the foot or abrupt start is all it takes to do damage to the differential.
I can trace most of my differential failures back to sketchy shift transitions or abrupt starts...
We all hate to admit that an equipment failure is our own fault but, speaking for myself, I know it often is.
This was an FoT Public Service Announcement...
Brought to you by Friendly Ghost Racing.
 
Jason Ostrowski
Friendly Ghost Racing 
1969 Triumph GT6+ Racecars   
 
 
On Sun, Jul 12, 2015 at 7:01 AM, Scott Janzen <sjanzen at me.com> wrote:
Mine disintegrated in a big way in the last race yesterday at Pitt Race. Last one did the same thing about 3-4 years ago.
Should I just consider this a consumable item, or swap to something stronger?  What are other vintage racers doing?

Sent from my mobile device
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