991R vs 991.2 GT3 Touring
07-06-2018, 12:09 AM
#316
FYI the 911 R gearbox is PN 9P1 300 064 A
The GT3 uses PN 9P1 300 064 B
The single mass flywheel is not related to the above. You can’t retrofit it the the 991.2 engine due to the new crank (and most likely harmonics and stresses amplified by the 500 rpm increase in max revs).
The GT3 uses PN 9P1 300 064 B
The single mass flywheel is not related to the above. You can’t retrofit it the the 991.2 engine due to the new crank (and most likely harmonics and stresses amplified by the 500 rpm increase in max revs).
Last edited by Petevb; 07-06-2018 at 12:44 AM.
07-06-2018, 12:13 AM
#317
07-06-2018, 12:14 AM
#318
Rennlist Member
I don’t give a rat’s *** about exclusivity. The driving dynamics and experience is very different from touring. The SMFW is terrific. I also put magnesium wheels, akrapovic exhaust and Breil lightweight battery. So the car is 80-90 lbn lighter than stock. Visually it just looks like a classic 911. I have no preference visually between 911R and GT3T.
07-06-2018, 12:19 AM
#319
i agree. The front end of of the R looks better than the GT3. That said I cannot wait for my GT3. I have a countdown app on my phone!!. I think about that day often. Will be in Zuffenhausen next Thursday which will like make my wait even worse.
07-06-2018, 12:31 AM
#320
Rennlist Member
Good for you! Post a few pics when you have a chance and safe travels.
07-06-2018, 01:02 AM
#321
Rennlist Member
My kind of driver.
Yes, this I can see. First time I drove the R, I was struck by how "Carrera 3.2 unhinged" it was around some of the small towns near Weissach. It almost seemed air-cooled, or at least as mechanical and then some. And yes it had the LWF/SMFW. Can't speak to an R so lightened, but imagine it has to be great...
Yes, this I can see. First time I drove the R, I was struck by how "Carrera 3.2 unhinged" it was around some of the small towns near Weissach. It almost seemed air-cooled, or at least as mechanical and then some. And yes it had the LWF/SMFW. Can't speak to an R so lightened, but imagine it has to be great...
07-06-2018, 01:13 AM
#322
Rennlist Member
Originally Posted by stout
My kind of driver.Yes, this I can see. First time I drove the R, I was struck by how "Carrera 3.2 unhinged" it was around some of the small towns near Weissach. It almost seemed air-cooled, or at least as mechanical and then some. And yes it had the LWF/SMFW. Can't speak to an R so lightened, but imagine it has to be great...
our dealer just did the 2-year service on my 991.1 RS today and will swap it out for the R for the weekend. You made me miss it! Pete - great analogy and I felt the same way regarding the analog feel of the 911R versus the Touring. Hope you are well.
Jeff
07-06-2018, 03:16 AM
#323
Race Car
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FYI the 911 R gearbox is PN 9P1 300 064 A
The GT3 uses PN 9P1 300 064 B
The single mass flywheel is not related to the above. You can’t retrofit it the the 991.2 engine due to the new crank (and most likely harmonics and stresses amplified by the 500 rpm increase in max revs).
while the main block parts are the same
agree that the GT3.2 superior NA engine performance make the smfw not a good solution
anyway R power band is ~ 8k so unless being very restrictive on the R throttle the smfw will anyway put more stress and a at full potentisl usage a sooner demage on the engine
of course a flipper/CnC/whocaresman garage queen doesn t care of itbut in 911 equation durability should be one of the founder pillar otherwisr i buy ferrari
Last edited by fxz; 07-06-2018 at 04:12 AM.
07-06-2018, 09:10 AM
#325
07-06-2018, 10:32 AM
#326
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^The Dual mass flywheel springs help absorb engine vibration which reduces wear on the transmission and the rest of the drivetrain.
the statement is not correct?
the statement is not correct?
07-06-2018, 11:11 AM
#327
You could try to make the argument that all else being equal an engine will last longer with a dual mass (though these also fail). However by that logic we could also argue that the R’s engine should outlast the 991.2 GT 3’s due its lower peak revs and resulting exponential stress reduction.
At at the end of the day we trust engineers have made all the trade-offs to release a durable package barring evidence to the contrary. The R’s single mass flywheel was dynamically balanced with the crank and rotating assembly, something the aftermarket can’t practically do. Given this and the .2’s increase in revs I’m not at all surprised AP recommended not retrofitting the single mass flywheels to the 991.2 GT3. Nor would I be surprised if we see a properly re-engineered single mass flywheel re-appear in the future on something like the upcoming speedster (keeping in mind that in the past single mass flywheels have typically been reserved for RS’s rather than GT3s). What I would not do is draw the conclusion that the single mass is inherently flawed other than the rougher feel and more challenging drivability. Many will view these as advantages I any case.
07-06-2018, 11:21 AM
#328
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^ very well explsined as usual Pete
i agree on all but about engine stress, GT3.2 engine isn't an R engine just revving higher
i agree on all but about engine stress, GT3.2 engine isn't an R engine just revving higher
Last edited by fxz; 07-06-2018 at 04:08 PM.
07-06-2018, 11:49 AM
#329
Rennlist Member
i´m still sceptical. but believing you two.
Maybe they are still the same hardware parts (99%).
But Getrag was not able to balance the whole package (SMFW, gearbox, etc) so ZF got the deal?
Who produces the SMFW? And who the DMFW?
Are in the Porsche world the same partnumbers (even if they do not have the same revision letter) interchangeable?
B instead of A normally yes.? this is for what revision letters are all about.
Would get a R a newer GT3 gearbox in case? Because there will be so or so no possibility for balancing it at the dealers...
07-06-2018, 12:04 PM
#330
I have wondered about what happens in future if R needs gearbox replacement, and which parts will be available.
Anyway, just google ‘911 R ZF’ and then ‘991 GT3 Getrag’ and you should be able to convince yourself :-)
Anyway, just google ‘911 R ZF’ and then ‘991 GT3 Getrag’ and you should be able to convince yourself :-)