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991 GT3 RS vs 991 GT3 Engine/trans differences

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Old 08-12-2015 | 01:47 PM
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Default 991 GT3 RS vs 991 GT3 Engine/trans differences

Can someone summarize the specific differences in the engines and the transmission/gearing between the two?
Old 08-12-2015 | 02:03 PM
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Originally Posted by Riz
Can someone summarize the specific differences in the engines and the transmission/gearing between the two?
The gearing in the RS is slightly lower (by way of R&P) in order to adjust for the larger 21" rear wheels. The net change is a very slightly taller effective gearing in the RS (which also compensates for the slightly lower redline in the RS).
Old 08-12-2015 | 03:45 PM
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24HP 20 Nm
Old 08-12-2015 | 03:50 PM
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Displacement. More torque from the 4 liter RS engine.
Old 08-12-2015 | 04:37 PM
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Supposedly also a change in oiling / cooling
Old 08-12-2015 | 04:43 PM
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Originally Posted by TRAKCAR
Supposedly also a change in oiling / cooling
This is what I would really like to know more about given some of the recent discussions.
Old 08-12-2015 | 04:49 PM
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air intake is different too
Old 08-12-2015 | 05:04 PM
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Also the rear badge...muuch lighter
Old 08-12-2015 | 06:03 PM
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Originally Posted by fxz
24HP 20 Nm
Over all the RPM range yes..
Old 08-12-2015 | 08:25 PM
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Originally Posted by karimgt3
Over all the RPM range yes..
like my GT3 modified exhaust...
Old 08-12-2015 | 09:10 PM
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There's also about $100k of unobtainium in that engine/tranny too.
Old 08-13-2015 | 12:44 AM
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Default 991 GT3 RS vs 991 GT3 Engine/trans differences

Originally Posted by GrantG
The gearing in the RS is slightly lower (by way of R&P) in order to adjust for the larger 21" rear wheels. The net change is a very slightly taller effective gearing in the RS (which also compensates for the slightly lower redline in the RS).
I think it's only final drive. Trans is identical. Software is faster on the RS. Lazy fingers don't wanna find backup.
Old 08-13-2015 | 12:50 AM
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Default 991 GT3 RS vs 991 GT3 Engine/trans differences

Some say (well AP did) that the crank in the RS uses the same steel from 919 Hybrid. I wonder if it's the same as the GT3. I get conflicting reports. I wouldn't be surprised if it's the same, and Porsche announced that on the launch of the RS to further justify the crazy hike in price (yay for marketing!).
Old 08-13-2015 | 01:19 AM
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Default 991 GT3 RS vs 991 GT3 Engine/trans differences

Originally Posted by Zulu Alpha
Some say (well AP did) that the crank in the RS uses the same steel from 919 Hybrid. I wonder if it's the same as the GT3. I get conflicting reports. I wouldn't be surprised if it's the same, and Porsche announced that on the launch of the RS to further justify the crazy hike in price (yay for marketing!).
Porsche says the crank is different in the RS. It is basically an alloy that goes through many processes that almost eliminate imperfections entirely. I believe the advantages are lightweight and strength. The marketing part is unobtanium and space technology.
I find it amusing that the GT3 is not using this strong crank and revs to 9K,yet the RS is,but it's only revving to 8600...
Old 08-13-2015 | 01:33 AM
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Default 991 GT3 RS vs 991 GT3 Engine/trans differences

Good info, thanks Nick


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