What are the engine differences between 996 Turbo and 997 GT2 RS?
#46
07-13-2010, 12:17 AM
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Agreed. The stick while much more sporty, will actually slow the car in straight line acceleration.
#47
07-13-2010, 07:08 AM
The 997 GT2 turbos are already considerably larger than the 997TT VTG's, especially on the compressor side, so the potential is already there. Tuning is all it needed to pump it up and I would not be surprised if it is closer to 680 ish as Porsche tends to underrate it's hp.
#48
07-13-2010, 11:39 AM
The 997 GT2 turbos are already considerably larger than the 997TT VTG's, especially on the compressor side, so the potential is already there. Tuning is all it needed to pump it up and I would not be surprised if it is closer to 680 ish as Porsche tends to underrate it's hp.
#49
07-13-2010, 12:32 PM
Where are you getting that they are small, when they are much bigger than the 997tt's turbo's?
#50
07-13-2010, 12:36 PM
#51
07-13-2010, 12:40 PM
, ok, I'll buy that. They are certainly not GT35's. But in the 600-700 range they are perfect
#53
07-15-2010, 01:23 AM
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After reading the latest article excellence magazine I have to agree with this post.
It seems it really is a pumped up 997.1 GT2 with bigger intercoolers and (possibly) even bigger VTG turbos (including the expansion intake manifold). Nothing mentioned about bigger injectors but I'd guess that's not out of the question given the need for more fuel overhead.
The article states that the suspension is virtually identical to the GT3 RS front and rear. I'm betting they used the GT3Rs flywheel as well.
Weights just over 3,000 lb. wet!!
Certainly within the realm of possibility to pump up 7.1GT@ to these specs and above with a flash, exhaust and IC. Certainly possible with similar minor mods and a good tune....
Here is what the GIAC flash did at GMG's facility. : The trick will be to lose 150lb (a large portion of which is lost in the euro seats that are not certified here + CF Parts). YOU DECIDE
Year And Model ECU Part Power Gains * Options Flash Loader Compatible 2008 GT2 Stock026120886740-70 hp and 90-110 ft-lbs91/100 octane/Valet/Kill/Privacy Firewall Yes2008 GT2 w/ exhaust0261208867up to 680hp and 700ft lbs91/100 octane/Valet/Kill/Privacy Firewall Yes2008 GT2 w/ exhaust/intercoolers0261208867up to 680hp and 700ft lbs93/100 octane/Valet/Kill/Privacy Firewall Yes
It seems it really is a pumped up 997.1 GT2 with bigger intercoolers and (possibly) even bigger VTG turbos (including the expansion intake manifold). Nothing mentioned about bigger injectors but I'd guess that's not out of the question given the need for more fuel overhead.
The article states that the suspension is virtually identical to the GT3 RS front and rear. I'm betting they used the GT3Rs flywheel as well.
Weights just over 3,000 lb. wet!!
Certainly within the realm of possibility to pump up 7.1GT@ to these specs and above with a flash, exhaust and IC. Certainly possible with similar minor mods and a good tune....
Here is what the GIAC flash did at GMG's facility. : The trick will be to lose 150lb (a large portion of which is lost in the euro seats that are not certified here + CF Parts). YOU DECIDE
Year And Model ECU Part Power Gains * Options Flash Loader Compatible 2008 GT2 Stock026120886740-70 hp and 90-110 ft-lbs91/100 octane/Valet/Kill/Privacy Firewall Yes2008 GT2 w/ exhaust0261208867up to 680hp and 700ft lbs91/100 octane/Valet/Kill/Privacy Firewall Yes2008 GT2 w/ exhaust/intercoolers0261208867up to 680hp and 700ft lbs93/100 octane/Valet/Kill/Privacy Firewall Yes
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
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
Last edited by Turbo Fanatic; 07-15-2010 at 03:34 AM.
#54
07-15-2010, 05:28 AM
min 1:15 he explain a little bit about the engine
http://www.youtube.com/watch?v=dWG2X...ayer_embedded#!
http://www.youtube.com/watch?v=dWG2X...ayer_embedded#!
#56
07-15-2010, 09:24 PM
Remember 1 thing the GT2 RS is 620 Crank.. Thats at MAX 560Whp.. My 997tt made near that with just intake,exhaust and Tune..
Also, If i am not mistaken the rods in the 997 are the same in 996 and 993 turbo.. So these rods are going way back..
Id venture to say my 997tt as it sits could go EASILY 100k miles Beating the **** out of it..
I will Guess and its just a guess the Bottom end on the GT2RS is Identical to 997.1,, They didnt do anything to strengthen it more and make it more reliable as far as bottom end goes. They know it can handle 620 Crank just like our 997.1. I dont want to hear about supposed " Special Con Rods & Special Pistons ".. that to me sounds like a sales pitch to make the RS owner just feel more Special then his buddies..
Mike
Also, If i am not mistaken the rods in the 997 are the same in 996 and 993 turbo.. So these rods are going way back..
Id venture to say my 997tt as it sits could go EASILY 100k miles Beating the **** out of it..
I will Guess and its just a guess the Bottom end on the GT2RS is Identical to 997.1,, They didnt do anything to strengthen it more and make it more reliable as far as bottom end goes. They know it can handle 620 Crank just like our 997.1. I dont want to hear about supposed " Special Con Rods & Special Pistons ".. that to me sounds like a sales pitch to make the RS owner just feel more Special then his buddies..
Mike
Last edited by AWD Motorsports; 07-15-2010 at 09:27 PM.
#57
07-16-2010, 05:19 AM
Remember 1 thing the GT2 RS is 620 Crank.. Thats at MAX 560Whp.. My 997tt made near that with just intake,exhaust and Tune..
Also, If i am not mistaken the rods in the 997 are the same in 996 and 993 turbo.. So these rods are going way back..
Id venture to say my 997tt as it sits could go EASILY 100k miles Beating the **** out of it..
I will Guess and its just a guess the Bottom end on the GT2RS is Identical to 997.1,, They didnt do anything to strengthen it more and make it more reliable as far as bottom end goes. They know it can handle 620 Crank just like our 997.1. I dont want to hear about supposed " Special Con Rods & Special Pistons ".. that to me sounds like a sales pitch to make the RS owner just feel more Special then his buddies..
Mike
Also, If i am not mistaken the rods in the 997 are the same in 996 and 993 turbo.. So these rods are going way back..
Id venture to say my 997tt as it sits could go EASILY 100k miles Beating the **** out of it..
I will Guess and its just a guess the Bottom end on the GT2RS is Identical to 997.1,, They didnt do anything to strengthen it more and make it more reliable as far as bottom end goes. They know it can handle 620 Crank just like our 997.1. I dont want to hear about supposed " Special Con Rods & Special Pistons ".. that to me sounds like a sales pitch to make the RS owner just feel more Special then his buddies..
Mike
I think we all agree that internally there is no difference between the GT1 motors in 996-997 series. The GT2 turbos are definitely larger than the 997tt turbos, that is a fact. I seriously doubt that the RS turbos are bigger. This is just better tuning and lighter weight. Taking weight off porsche style is not cheap and I am sure that is where the money is at.
As for durability. There is a guy in my town with an 01 996tt that has 120k miles on it and most of it is highly spirited driving. The car runs great. I know of several 60-70k mile cars that have not only all hard miles but all tuned, modded hard miles from nearly day 1.
#58
07-16-2010, 05:58 AM
Agreed. I'm confident it's using the same rods and pistons the rest of them are.
#59
07-16-2010, 02:46 PM
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I just find it highly suspect that an engineer can lie like that...maybe by different meaning small differences in machining for some other non performance issue and just calling it new, a la emissions or simply compression ratio change via pistons idk... I just find it hard to believe it's allowed to lie like that knowing the truth...if it is the truth 
#60
07-16-2010, 03:48 PM
This type of claims are frequent in the P world. I mean, even the X50 996 is "supposed" to have better pistons/cylinders/rods bla bla bla...than a normal TT...
Engineers know how much power the gt1 engine can make reliably, and I'm sure they don't want to "try" something new in a super special car.
They may eventually take some components and do very minor modifications to them.
No one wants to mess with brand new components that should prove themselves on the road. IMO.
Engineers know how much power the gt1 engine can make reliably, and I'm sure they don't want to "try" something new in a super special car.
They may eventually take some components and do very minor modifications to them.
No one wants to mess with brand new components that should prove themselves on the road. IMO.