Don't overfill the diff, it is designed to run in a shallow amount of fluid,
not in a bath. Definitely use synthetic as it will run cooler
Sent from my iPhone
> On Jun 3, 2015, at 9:30 AM, Greg And Alison Blake <ablake2@austin.rr.com>
> wrote:
>
>
> Got some great feedback on this one. Such a great list. Just wish I knew
> before last weekend about this failure mode. We could have turned another
> 200+ laps.
>
> One follow up. Is there a down side to overfilling an IRS diff unit? I am
> thinking I'll install a metal catch can in the trunk and plumb to the bottom
> of the can. Would putting in another 1/2 quart into the diff aid in cooling
> or just get puked out earlier? If that's not an option, I'll investigate
> adding a bit of capacity to the cover along with a few fins.
>
> Thanks.
>
>
>> On Jun 2, 2015, at 12:40 PM, Greg And Alison Blake <ablake2@austin.rr.com>
>> wrote:
>>
>> Some of yall may have followed the social Media posts provided by our
>> teammates through the weekend. We were racing the Beanitos TR6 this past
>> weekend at what was to be TWS's last ever race. It was a split 16 hour
>> endurance race (Sat&Sun).
>>
>> We had a strange failure on Saturday. About 6 hours in, the truck was full
>> of gear oil. I had routed a diff vent line to the trunk. Upon returning to
>> the garage, we discovered melted poly diff mounts. Pic below.
>>
>> I've been scratching my head on this one. Prior to boiling the diff fluid,
>> we had zero leaks in the freshly serviced diff. I had replaced all seals and
>> filled with STALUBE 90WT GL4.
>>
>> I've been racing my TR3 using this same diff fluid for 6 years (replaced
>> every two weekends). Never a problem with my vintage race car. Of course,
>> I've never run the 3 for 6 hours straight.
>>
>> Some of the more seasoned endurance racers asked what fluid I had in the
>> diff. All suggested that mineral based fluid is not a good choice for
>> endurance events.
>>
>> I'd love to hear opinions as to the route cause of our failure and more
>> importantly, suggested remedies.
>>
>> As to the results, the car was running consistently 2:1x laps with a fast
>> lap of 2:10. We ended up taking the workers choice award. Had we run w/o
>> diff failure and a subsequent battery failure, we could have been in the
>> hunt for a podium finish. Fastest lap in our group was 2:09.9
>>
>> Great weekend
>>
>> <image1.jpeg>
>>
>>
>> Thanks
>> Greg
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