It seems this GT2 Item as made it to 997 Turbo S, giving 30HP, can this be done for a 996 TT ??????????????????


The air intake manifold on the new 911 GT2 employs a totally new principle unlike anything ever featured on exiting induction systems. Our `expansion’ intake manifolds is a radical new development that is the polar opposite of the resonance principle used on conventional turbocharged engines.
A resonance manifold increases engine output by forcing additional air into the combustion chambers. To do this, the manifold is designed in such a way that the air – which vibrates due to the action of the valves – is in a compression phase as it passes through the inlet ports. Unfortunately, compression not only increases air volume, it also increases air temperature. The result is poorer ignition.
Our new expansion manifold simply turns that principle around. The internal geometry is radically different from that on a resonance intake system. Key modifications include a longer distributor pipe, with a smaller diameter and shorter intake ports.
As a s result, the air is in the expansion phase as it enters the combustion chambers. Since expansion always cools, the air/fuel temperature is lower and ignition is significantly improved – thereby increasing performance. Of course, the amount of air that enters the engine under expansion is less than it would be under compression.
To compensate for this, we’ve simply increased the boost pressure from the turbos by approximately 2.9psi. The resulting increase in temperature – again through compression – is immediately offset by the up rated intercoolers.
Instead of hot compressed air entering the combustion chambers, we now have cooler air generating more power and torque. The result: a major improvement in engine efficiency and therefore lower fuel consumption even under heavy loads and high rpm.
A simple solution, but then that’s often the way when you take a new approach to old ideas.

 

so nobody can replicate the longer distributor pipe ?? or has any comments on this

 

Lots of discussion on intakes in other threads honestly. I've been trying to wrap my head around this idea that the entire intake won't be at the same pressure. This idea that the air will expand past that middle pipe and get cooler is hard to understand unless there's a decent restriction prior to the "expansion". I bet if you put a pressure gauge on upper pipe and the "expansion" area it would show the same pressure - I could be wrong so I would love to hear other opinions. I dunno', hard to wrap my head around it and is why I didn't post earlier

 

If you can remap the ECU to utilize the new intake, you should be able to use any intake.

 

Hrm, would the intake need a remap? The MAF will see the added airflow and fuel accordingly. Timing might change if this is really more efficient but so long as the original tune was mapped out for the added airflow even that might be okay. More tuning for the differences would be good but I wonder how different it would be....

 

gt2 expansion intake system....you need 1,4bar boost to get 530crank HP( a lot more boost and ignition timing)...this system flows real good at a flow bench...but with pulses from a 4 strocke turbo engine at high rpm then it could be a different world....1,4bar for 530crank HP...what boost would you need for 700whp? I think that limits this Intake

 

Is this just Tooo Complicated for our Experts here ??

 

I've seen a 997 turbo manifold which looks very similar to the 7 gt2 manifold ON a 996tt. It fits... it should work well... better than the 996tt one for sure.

 

No, but using stock factory parts for decent results would be bad for tuning business... Especially when 997 GT2 intake parts ( three biggest ones ) can be bought for less than €800,- and the TB is around €300,-.

 

Well guys, they needed to up the boost 2.9psi to make the 30hp more? I've seen 20whp from 1psi of boost on our dyno on the 996tt with K16's, I'm guessing just upping the boost 3psi on a stock manifold would get you much better gains.
From the looks of this manifold it would hurt more than help in higher HP applications.

Who wrote that article? First off compression doesn't increase volume when talking about air inside a closed volume (intake manifold), it increases density. They are trying to say compressing the air make it more dense, but also increases the temperature. Poor ignition is the result of warmer air? Warmer air is less dense and thus has less oxygen, plus warmer air increases the propensity for detonation. I think a marketing person not engineer wrote that thing.

 

I think the main idea is to try to keep the intake manifold at a relatively high static pressure, and to allow the air to expand across the intake valves and into the combustion chamber to get the cooling effect during the intake cycle. If this effect dominates, perhaps they don't worry too much about acoustic waves, and the manifold volume and tuning is not as critical. It may be overly simplistic to suggest that an engine is better because it produces more power on less boost - it may be throwing away more exhaust energy, and it may have a lower overall efficiency.

 

Bill do any of these 997 GT2 intake parts fit the 996 TT ??

Eric, The text above is available in the Official Porsche GT2 brochure

 

The new 911 GT2's expansion intake manifold, which uses oscillating air in the intake during the cooler expansion phase, keeps the temperature of the fuel/air mixture even lower than in the 911 Turbo. This results in a significant increase in all-round efficiency, with fuel consumption down by up to 15 percent under full load despite and an increase in engine output. This is a genuine innovation for turbocharged power units.

 

another more detailed pic, if this really works for a 996 TT and the OEM parts are relatively cheap does anybody have the 997 GT2 parts nos ?

 

After zooming through the PET I'd say that fitment issues which would have to be solved by having a partially dismantled engine and 997 GT2 parts at hand are these:

-intake runners to intake ports, also intake attachment to heads
-will GT2 intake clear 996 turbo's oil cooler
-air injection ( The biggest issue, the system is completely different, and I do not mean secondary pump placement. ) In 996 it's a part of those short intake manifolds, but in 997 independent. OTH it's still possible that the system still uses same channels in the heads.
-injectors and fuel rails ( 996's ones might fit but once again,who's going to try? )

All other things are small ones, mainly tubing & plumbing. Just work but not rocket science. Completely another question is that is it worth it?