6SpeedOnline - Porsche Forum and Luxury Car Resource - What are the engine differences between 996 Turbo and 997 GT2 RS?

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- - What are the engine differences between 996 Turbo and 997 GT2 RS? (https://www.6speedonline.com/forums/996-turbo-gt2/216671-what-engine-differences-between-996-turbo-997-gt2-rs.html)

Quote:

Originally Posted by 9Eleven (Post 2906145)

Scott, doesn't 1.6 bar sound like a lot more than 620 crank hp?

Not with those tiny VTG turbos, it doesn't.

Quote:

Originally Posted by Divexxtreme (Post 2906140)

According to this, the rods, pistons and block are the same as what's in any other 996 or 997 Turbo or GT2:

Looks like all they did was use different ICs, intake manifold, increased boost and a tune:

Engine and powertrain
The high-performance engine of the new 911 GT2 RS is based on the bi-turbo engine of the 911 GT2 and thus features the following highlights:

• Flat-six bi-turbo engine, with 3.6 l displacement and intake manifold injection
• 2 turbochargers with variable turbine geometry (VTG)
• Camshaft control and valve lift adjustment with VarioCam Plus
• Expansion intake manifold
• Dry-sump lubrication with external engine oil tank
• Forged pistons and connecting rods
• Rear silencer and tailpipes made from Titanium

For the new 911 GT2 RS, the engine has the following features:

• New plastic expansion intake manifold
• New charge-air coolers with markedly improved efficiency
• Increase of maximum boost pressure
• Adaptation of engine control, including injection system and ignition
• Single-mass flywheel (911 GT2: dual-mass flywheel)

With these modifications, the new 911 GT2 RS gives the following improvements compared to the 911 GT2:
• Power output increased by 90 hp to max. 620 hp
• Torque increased by 20 Nm to max. 700 Nm
• Power output per litre increased by approx. 17% to max. 172.2 hp/l
• Weight-to-power ratio improved by nearly 20% to 2.21 kg/hp

I'd wager they modified the GT2 VTGs (which are in a larger housing than the TT.) Doesn't have the potential as some of the big boy turbos you guys are running, but mid to high 500 WHP is easily do-able even with 997TT VTGs.

It'll be interesting how it puts down power. The GT2 RS is meant for the track. Most of the modified VTG turbos that put down big power have a much higher boost threshold and greater lag than stock wheels.

bob

Quote:

Originally Posted by Divexxtreme (Post 2906152)

Not with those tiny VTG turbos, it doesn't.

Engineering marvel that is.

Quote:

Originally Posted by 9Eleven (Post 2906168)

Engineering marvel that is.

Definitely. It's my absolute dream car.

Quote:

Originally Posted by Divexxtreme (Post 2906149)

Are you talking about the 3.8 DFI in the 997.2?? :D

Because I'm pretty sure that everyone other than you clearly understood that I was talking about the 3.6L Metzger that's in the 996 and 997.1 cars.

Scott,

I read the post. There were no points after the numbers. The best way I could clear it up was to use the 996 and 997, tt, GT2, GT2RS or GT3 in particular year models.

I believe we have the same understanding. I am not sure everyone understandings what models the Metzger was discontinued in. Then again, maybe they do.

Quote:

Originally Posted by cjv (Post 2906190)

It honestly didn't occur to me that I would need to specify that I was referring to the 996 and 997.1 3.6 engines, rather than the completely redesigned 997.2 3.8 DFI engines.

But, you are correct that it may be confusing to a few members. Thank you for the clarification.

Scott,

What's your source? I'm not doubting it in the least, just wondering where you found it. The Excellence article was written by Chris Harris who has been racing with Walter Rohrl with the Porsche factory electric street car and did the 24 hrs at Nurburgring. My earlier post about the article quoted different pistons, intercoolers and turbos. Clearly, at this point it's nothing but conjecture till the factory tells us what's going on.

Either way, hell of a car!

In the future can we refer to the 3.8 Di by its rightful Porsche given name ( A91 series) sincerely yours

- Mr Technicality-

Quote:

Originally Posted by germeezy1 (Post 2906213)

In the future can we refer to the 3.8 Di by its rightful Porsche given name ( A91 series) sincerely yours

- Mr Technicality-

Many of the tuners and builders are referring to it as Porsche's new Japanese motor. :eek:

Mark -

Loren, the owner of Renntech posted it (posts #1 and #3). Looks like the info came from a press release from Porsche USA in May: http://www.renntech.org/forums/index...he-911-gt2-rs/

Anyway, you (Excellence) may be right. It may indeed have new pistons. But I would be surprised if it actually does. I mean, the standard pistons are already forged from the factory and have proven themselves good at over 1,000 HP. They certainly don't seem to be a weakpoint...

You are correct, however. It's all conjecture..and it is one hell of a car!

Quote:

Originally Posted by cjv (Post 2906219)

Many of the tuners and builders are referring to it as Porsche's new Japanese motor. :eek:

:eek::eek:

Thanks everyone, great stuff!

Don't see it as such a big achievement. My car makes 610 crank HP on 91 with 60lb injectors, intercoolers, small GT2860s and a Remus Exhaust on an otherwise mostly stock 996 fare @17.5 PSI.

I'm betting the GT2RS is under rated and makes closer to 680 HP. Anyone want to bet it makes high 5xx wheel HP?

Quote:

Originally Posted by ari (Post 2906341)

Agreed, please don't slap me but honestly I would love to see this car available with a PDK gearbox as an option. I wonder if the VTG's have higher flow housings or are different than the standard GT2 turbos.