718 GT4?
Instructor
Joined: Jul 2017
Posts: 215
Likes: 1
That video had a lot of GT4s including one of the earlier ones that we've seen. Not sure if this is all recently shot but here's what I think we see and hear:
- Some of the GT4s are definitely NA,
- The GT4s' exhaust seemed quieter/muffled but still NA in most of the segments of the video,
- The speedster's exhaust is a little quieter compared to the GT3 RS's and 992 GT3 exhaust,
- The 992 GT3 videos we are seeing might not be with the GPF,
- The 991.2 GT3 RS is awesome,
- The 992 GT3 is going to be awesome if what we see in this video is a 992 GT3 with GPF.
Rennlist Member
Joined: Feb 2015
Posts: 1,343
Likes: 269
Originally Posted by Teo
from PFF:
Strange GT4 at 7.20...
Strange GT4 at 7.20...
The 718 GT4 sounds good. One of the passes it has the same tone as the 3.8 imo. I wonder if they are running one with a 3.8 in it and a 4.0. Sometimes at low revs it has that deeper 4.0 sound imo.
Also the RS3 pass at one point sounds pretty damn good. I might pick one of those up. dunno.
Race Car
Joined: Jan 2008
Posts: 4,689
Likes: 737
From: Scottsdale, AZ
Race Director
Joined: May 2013
Posts: 10,235
Likes: 1,986
From: Hypercar Invitational
dude awesome video! never seen that footage. The GT4 sounds good. It's just low revs / off throttle at 7.20 I think.
The 718 GT4 sounds good. One of the passes it has the same tone as the 3.8 imo. I wonder if they are running one with a 3.8 in it and a 4.0. Sometimes at low revs it has that deeper 4.0 sound imo.
Also the RS3 pass at one point sounds pretty damn good. I might pick one of those up. dunno.
The 718 GT4 sounds good. One of the passes it has the same tone as the 3.8 imo. I wonder if they are running one with a 3.8 in it and a 4.0. Sometimes at low revs it has that deeper 4.0 sound imo.
Also the RS3 pass at one point sounds pretty damn good. I might pick one of those up. dunno.
Advanced
Joined: Jan 2015
Posts: 87
Likes: 30
We all agree there is a huge variance in the sounds of the GT4's we see in the videos. The GPF appears to drastically alter the sound of the car if that is what we are hearing. The first one you see in that vid has what I would call a deeper version of the original GT4's sound. Could be GPF. Could be it's a larger bore/longer stroke variant of the previous motor. Who knows. The one at 1:36 and 2:18 sounds more like the original GT4. The one at 3:29 sounds entirely different from the others. It also could all come down to the new PWW controlled exhaust valves as well. They are apparently no longer just opened or closed as on the previous gen car.
One observation I would make is why does the new GT3 in black sound exactly like the previous gen GT3 leaving the pits behind it? Would seem if it had the filters on it the that note would change there as well.
One observation I would make is why does the new GT3 in black sound exactly like the previous gen GT3 leaving the pits behind it? Would seem if it had the filters on it the that note would change there as well.
Apparently the Speedster is not getting GPF’s in US. Many of the recent Speedster reviews have this info.
Interestingly enough, cars bound for the United States will not get the particulate filters but instead will have devices meant to mimic the restriction of the exhaust-choking filters to simplify engine tuning.
Note that in place of the particulate filters, U.S.-bound cars will get an inert substrate that simulates the filters' back pressure.
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
9 Features and Characteristics That Only Porsche People Understand
Verdad Gallardo
I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way
Joe Kucinski
10 Most Unnecessary Porsches Ever Built (And Why We Love Them)
Verdad Gallardo
Porsche 911 GT3 S/C vs 718 Spyder RS: 10 Categories, One Winner
Joe Kucinski
This Builder Is Turning Heads With Its Slantnose 911 Creation
Verdad Gallardo
Porsche 911 GT3 Artisan Edition Pays Homage to Japanese Culture
Verdad Gallardo
Porsche Reveals Coupe Variant of the Electric Cayenne With a Fresh Look
Verdad Gallardo
10 Porsche Colors That Have More Personality Than Most People
Verdad Gallardo
Guntherwerks' Final Speedster Creation Is the Ultimate Porsche Restomod
Verdad Gallardo
Rennlist Member
Joined: Oct 2003
Posts: 3,728
Likes: 700
The GPF is an integral part of making noise targets with the smaller, lighter muffler. In the US it’s replaced with a mesh that must re-create both the back-pressure and at least some of the noise reduction. Personally I wouldn’t hold my breath...
Three Wheelin'
Joined: Nov 2004
Posts: 1,370
Likes: 102
From: Minnetonka, Minnesota
Thanks, Pete. Since we don't have a regulatory requirement for reduction in noise, the mesh doesn't need to diminish the noise level? Or, is reducing back-pressure automatically cuts the noise as a side-effect? One member posted hearing the engine in a closed garage. He commented that the US-spec car sounded deeper, at low RPM, than 981. He alluded the sound as "better".
Pro
Joined: Aug 2016
Posts: 670
Likes: 434
From: Canada
Here’s hoping the ROW cars don’t even have the back-pressure and sound deafening mesh at all.
If I recall correctly in Pete’s 991.2 Speedster thread he stated that Porsche indicated the mesh material for ROW cars was neccessary because of the independent throttle bodies specific to the speedster motor, as the ITBs and Particulate filters/backpressure mesh were directly related.
I highly doubt that the GT4 will be getting ITBs, so in that case technically there would also be no need for the mesh for ROW cars. Just being optimistic
If I recall correctly in Pete’s 991.2 Speedster thread he stated that Porsche indicated the mesh material for ROW cars was neccessary because of the independent throttle bodies specific to the speedster motor, as the ITBs and Particulate filters/backpressure mesh were directly related.
I highly doubt that the GT4 will be getting ITBs, so in that case technically there would also be no need for the mesh for ROW cars. Just being optimistic
Rennlist Member
Joined: Jul 2015
Posts: 4,762
Likes: 1,501
Here’s hoping the ROW cars don’t even have the back-pressure and sound deafening mesh at all.
If I recall correctly in Pete’s 991.2 Speedster thread he stated that Porsche indicated the mesh material for ROW cars was neccessary because of the independent throttle bodies specific to the speedster motor, as the ITBs and Particulate filters/backpressure mesh were directly related.
I highly doubt that the GT4 will be getting ITBs, so in that case technically there would also be no need for the mesh for ROW cars. Just being optimistic
If I recall correctly in Pete’s 991.2 Speedster thread he stated that Porsche indicated the mesh material for ROW cars was neccessary because of the independent throttle bodies specific to the speedster motor, as the ITBs and Particulate filters/backpressure mesh were directly related.
I highly doubt that the GT4 will be getting ITBs, so in that case technically there would also be no need for the mesh for ROW cars. Just being optimistic
Rennlist Member
Joined: Jul 2015
Posts: 4,762
Likes: 1,501