M3the01

Hi all,

Just a bit curious and can't find much info out there. I get it, some basics, ie tune, intercoolers, turbos, exhaust, intake all different but what changes are there to the internals?

Point me to some threads... Just want to read and understand. Ty.

Chris88

This video might help answer your question:
https://www.motor1.com/news/295812/a...he-911-gt2-rs/

ilovecarbs

From what I've read, there aren't any internal changes, correct me if I'm wrong

GrantG

Didn't realize that the oil has to be changed after every event. GT3/RS only requires change after 6,200 track miles (12 Indy 500's) which seems a bit much...

I guess that must be a result of oil hot spots (as oil passes through turbochargers, perhaps?)

Still not aware of any internal differences to Turbo.

ajw45

Porsche lists the GT2rs compression ratio as 9:1 vs 9.8:1 for the Turbo/Turbo S so something's different......

GrantG

Yes if that's the case, it implies the pistons are probably different.

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.

groundhog

Porsche recommend if the GT3 RS is being used primarily for track - full oil change at 3000 miles or 5000km (I do it a lot more than that). The GT2RS will have a shorter interval than that (I would imagine) due to the turbos.

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.

Taxi

Nope. 991.2 GT2 RS hasn´t go dry sump lubrication with separate oil tank, mill has only "intergrated dry sump" = marketing bla bla.
Good old Mezger RIP.

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...

M3the01

Dealer said no need for oil change after track days... Said to be safe, if primarily track, come in after 3k miles.

GrantG

What does the track supplement that comes with the car say?

I’d rely on that more than a dealer...

Waxer

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

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