Originally Posted by groundhog

The drivers manual and Motorsport manuals both state 3000 miles/5000kms (as I pointed out above)

Most would consider that a minimum and the reality is it should be changed as required (if used solely for Motorsport)

also the 2RS change quantity is 7.94l whereas the GT3 is 6.4l

Originally Posted by GrantG

Hmm, I always add slightly over 7 liters to fill (but I let drain from both main and rear drain plugs). I wonder where the recommendation to change after every event came from?

Originally Posted by A/S

These are the features listed in the Technical presentation for the GT2RS compared to the 991.2 Turbo S:

- Modified crankcase
- Bespoke pistons
- Bigger turbochargers
- Multitube airfilter
- Enlarged air ducts
- High-performance cooling system
- Titanium sport exhaust system
- 67mm compressor and 55mm turbine (vs. Turbo S 58/48)
- The headers have a 25% enlarged cross-section
- Airbox with multitube maximizes surface area, increases airflow and the packaging is smaller
- Intercoolers have 27% more airflow thanks to new ducting and position
- Intercoolers are 15% larger
- Water vaporization system increases the intercooler efficiency by another 20%, and reduces air intake temperature by up to 70 degrees F

It is not a RWD 991.2 Turbo S, it is a 991.2 GT3RS with a GT engine evolved from the 991.2 Turbo S, and an unique PDK transmission as well.

Originally Posted by Waxer

In short, not much difference other than stronger crank and different pistons. The rest is bolt on bigger stuff. It’s a Turbo S motor on steroids.

Compare that to the differences between a standard 991 NA motor and the RS Motorsport mill. Lots of internal differences.

Originally Posted by GrantG

Actually, crank refers to crankshaft which apparently the 2RS shares with the Turbo.

It says modified crankcase which is sort of like engine block, but different construction on a 911. It’s not clear exactly what they did there, but could be something very minor (to mount to the larger headers for instance) or something more significant to strengthen or improve oiling for another example...

Originally Posted by Waxer

So bottom line not much difference because if there was we would have been told all about it. For sure.

Originally Posted by GrantG

I was referring to track manual for GT2 RS

Originally Posted by GrantG

Actually, crank refers to crankshaft which apparently the 2RS shares with the Turbo.

It says modified crankcase which is sort of like engine block, but different construction on a 911. It’s not clear exactly what they did there, but could be something very minor (to mount to the larger headers for instance) or something more significant to strengthen or improve oiling for another example...

Originally Posted by Perimeter

The compression ratios are different. The crank has got to be different

Originally Posted by dewilmoth

Differing compression ratios does not mean the crank has to be different.

Originally Posted by dewilmoth

Differing compression ratios does not mean the crank has to be different.

Originally Posted by groundhog

The numbers quoted are from the Race Circuit driving chapter of the manual .

The recommended oil level for optimum engine operation, during race circuit driving, is approximately 75% of the display area B. When topping up, be aware that the difference A between the minimum and maximum marks is approximately 1.25 litres (GT3) or approximately 1.25 litres (GT2 RS). Overfilling with oil must always be avoided . Check the engine oil level before each race circuit session and top up if necessary. The engine oil and oil filter must be changed after 5000km (3000 mls) of race circuit driving at the latest.

Perhaps it’s different in the US for some reason.

Originally Posted by ipse dixit

Typical Waxer ...

Originally Posted by GrantG

Maybe you’re saying that your track manual gives same for both 3RS and 2RS?