hey that's not so hairy like last time.

 

Just be glad you guys have such an awesome vendor like Guard to upgrade your diffs. Us M3'ers have to ditch the entire stock M-variable unit for a more aggressive multi-disc setup, and the labor is alot more for the install......I read this thread and get sad about how long I've put off replacing mine. lol

 

Bump on these questions. Anyone?

 

Sorry I could not make it to SP today. Work has a strong grip on me lately. I will be at Laguna Seca tomorrw. Hope you had a good time.

Service interval right?

 

Sorry, I guess I missed these questions the first time around. I often browse from my phone and sometimes if it kicks me to a new page, I never go back and look at the previous page, missing a post or two.

Anyway...
1. Gear driven torque biasing differentials do NOT offer lock up under braking. They are better than an open differential, but they are still inferior to a true clutch type LSD. While Audi loves to put torsens in their cars, the only vehicle Porsche has ever offered one on is the 968. I don't see it happening again in the future.

2. You were told wrong. That's backwards. LSD spins them the same way and open is opposite.

3. I think we covered this earlier in the thread but cars and their chassis have gotten so good on sports cars that they can do that. 90% of the population won't know the difference and the car is so good with all of it's electronic differentials and stability controls and gizmos that it lets people feel like superman when they are really just Jimmy Olsen. For someone who drives the car at the limit on the track and has some skills they will know the difference. But most people won't, and the limit and ragged edge is getting so far out there on these cars that the best performance doesn't seem to matter so much as that they deliver a car with really good performance. I blame Top Gear and magazine editors who don't really know how to drive a car.

 

Like Mike said, service interval, service interval, service interval.

However, with the way that the 997 Aisin gearboxes burn up 3rd gear synchros at the track, I would personally stay away from Redline if you are racing the car. It's a great street oil. It's a great oil in a Cup Car sequential dog box. For a street gearbox that doesn't have steel synchros that gets beaten on at the track, my experience has been that it gets too slick when it gets hot and accelerates wear and in some instances will lead to outright inability to shift into certain gears late in a long enduro event.

However, I will openly admit that there are other professionals in the industry who disagree with this assessment. It's just my opinion and you know what they say about opinions...

 

I had talked with Matt because my LSD felt like an off switch, he recommended to change gear oil once a year (I only street drive the car for now) so I went ahead and changed oil. Sure enough the oil was very dirty and with the new oil, the LSD was transformed again - smooth transitions from lock to unlock to lock.
I attached some photos of the oil container and oil pump I purchased, works like a dream!

 

very nice looking tool... where do you buy that? can you provide a link? thanks!

 

I bought the oil and containers from: Lubrication Engineering, talk to Charles Massey 817-834-6321. He and his oil was highly recommended from the previous owners of Guard, they have been in business for 56 years.
I love their oil, the shifting is super smooth and keeps the transmission oil temperature lower supposedly.

I bought:
75-90 weight oil, part #9919 5 Gallon container.
75-140 weight oil for my race car part #9920 5 Gallon container.

2 Oil save drums 10 Liters each for the different oil grades, 2 utility covers one in red and one in blue plus one pump.

 

awesome thank you!

 

For those who don't want to commit to the whole 5 gallons at a time, there are several of our dealers who repackage this stuff into single gallons for those of you who don't race and who aren't changing your oil more than once a year or so. Drop me a line if you'd like their contact information.

 

Matt, If I have a Guard LSD (Aug 2010), use LE 75-90 weight oil and only street drive 3k miles a year, how often do I need to change the oil.

 

Does anyone have pictures or directions how to change
the transmission fluid?

 

Probably only every 2-3 years. I know that they list a longer service interval than that with respect to miles, but I don't like to leave any fluids in the car more than a few years. There was recently some guy on RL who was talking about changing the gear oil on his 993 for the first time because he had just hit 60k miles. He was pulling out 15 year old gear oil. Bleck.

 

I plan on changing it every 12 track days or so, does that sound OK?