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Why can't they fit a NA engine in the 992?

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Old 11-28-2020, 11:14 PM
  #31  
westcoastj
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Nothing against turbos (my previous car was a 2016 Golf R and my current car is 2019 Audi RS3). My dad had a 2002 Carrera 4S when I was in high school (he never let me drive it...) and I just remember the sound of the engine/exhaust! I was merely pointing out that according to the article, they said they would not make a NA 992 as they couldn't make the engine from the cayman GTS/GT4 fit, and the R&D to make a NA engine for the 992 would be too high - couldn't they just make a slightly detuned version of the GT3 engine? Anyways, my ideal weekend car would be a Cayman GTS 4.0, but I would like a 2+2 so I can fit my wife and infant daughter.
Old 11-28-2020, 11:58 PM
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frankchn
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Originally Posted by westcoastj
couldn't they just make a slightly detuned version of the GT3 engine? Anyways, my ideal weekend car would be a Cayman GTS 4.0, but I would like a 2+2 so I can fit my wife and infant daughter.
I read an interview with AP when the GT4 launched that the reason why they didn't put the GT3 engine in the GT4 is (partly) cost. I assume the economics are such that it doesn't make sense to put the engine in a car priced below ~$140k base.

You might be interested in a GT3 Touring, which is rumored to have back seats.
Old 11-29-2020, 09:11 AM
  #33  
Richard_Wallace
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Originally Posted by Bluehighways
Actually . . .

Per MotorTrend: The Turbo S 991.2 was at 18.1 PSI boost. The 992 Turbo S is now at 22.5 PSI maximum boost.
https://www.motortrend.com/cars/pors...92-comparison/

Per AutoBlog: The 992 Carerra S is at 1.1 BAR. 1.1 Bar is 1.1 * 14.696 = 16.1656 PSI.
https://www.autoblog.com/2019/03/07/...abMNTgNCLmiHvF

FWIW, This 16 PSI number also matches what Car & Driver reports.

I'm assuming that the Buff Books are not making these numbers up on their own. I'm fairly certain that they're all getting their numbers from their pressbooks that they got from Porsche.

In any case the point is moot. A 4.0L engine to equal a 3.0 L engine at 16 PSI Boost (all else being equal) would need a boost pressure of ~8.4 PSI.
I can take a picture, as mine (4s Manual) consistently will go to 17 and 18 PSI on the readout, as does my buddies PDK S -it seems like the 992 goes to 18 or the readout is wrong. PS. Your point still stands, was not disagreeing with that at all - btw.
Old 11-29-2020, 10:53 PM
  #34  
AlexCeres
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Originally Posted by frankchn
I read an interview with AP when the GT4 launched that the reason why they didn't put the GT3 engine in the GT4 is (partly) cost. I assume the economics are such that it doesn't make sense to put the engine in a car priced below ~$140k base.

You might be interested in a GT3 Touring, which is rumored to have back seats.
i think it’s more than just unit cost. The gt4 sits mid engined and it was cheaper to develop a new bespoke engine than modify the gt3 engine. I forget the details but the gt3 engine can’t just be dropped in. Developing a new engine is a huge cost to amortize over all the gt4 sales, and still cheaper.



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