991.2 GT3 RS batch '2' GPF?

991.2 GT3 RS batch '2' GPF?

Author
Discussion

Spyder75

31 posts

7 months

Saturday 24th August
quotequote all
Looking under the car it’s certainly not subtle...

Juno

3,651 posts

194 months

Saturday 24th August
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BrntRubber said:
Sandy59 said:
Taffy66 said:
As the old vacumn exhaust valves have been replaced by new electronic exhaust valves on the GPF RS i expect the transition between on/off will be less pronounced . Or is it more complicated than that..?
JCR have assured me they intend to develop a new Titanium exhaust for the GPF RS..Akrapovic on the other hand have said that they do not intend developing an exhaust for the GPF RS due to the very low numbers of cars and short life cycle.
I wonder if a new or modified PF cartridge would be simpler, quite a serious looking piece of kit after the PFs ??

It certainly looks heavy vs a little titanium.
Apparently the old side mufflers were 22lbs each side but now deleted, the new PF replacements are much lighter so I’m told but does it really matter?

Macca993

429 posts

196 months

Saturday 24th August
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According to a (seemingly very knowledgable) German who posted on the PFF site one of the biggest technical challenges of the GPF on the GT3 engine is the reduction in the header length and this alone is responsible for some of the sound difference and where the power and torque peaks in the rev range. I seems like an insurmountable challenge as the gasses need to be very hot when they enter the GPF matrix . You can see on the diagrams above that the manifold is shortened. If you have experience with headers on these cars (I had the Dundon ones on my 991.1 GT3) you will know that the length is a critical aspect to tuning for output etc. it’s a weird and complicated science in practice. I’m unsure anything other than a full manifold coward aftermarket system will restore all the sound - and then of course there will likely need to be some remapping of the ECU. I don’t expect the aftermarket industry to get behind this in force till the 992 GT3 arrives as the US doesn’t have the .3 RS....

Juno

3,651 posts

194 months

Sunday 25th August
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Macca993 said:
According to a (seemingly very knowledgable) German who posted on the PFF site one of the biggest technical challenges of the GPF on the GT3 engine is the reduction in the header length and this alone is responsible for some of the sound difference and where the power and torque peaks in the rev range. I seems like an insurmountable challenge as the gasses need to be very hot when they enter the GPF matrix . You can see on the diagrams above that the manifold is shortened. If you have experience with headers on these cars (I had the Dundon ones on my 991.1 GT3) you will know that the length is a critical aspect to tuning for output etc. it’s a weird and complicated science in practice. I’m unsure anything other than a full manifold coward aftermarket system will restore all the sound - and then of course there will likely need to be some remapping of the ECU. I don’t expect the aftermarket industry to get behind this in force till the 992 GT3 arrives as the US doesn’t have the .3 RS....
That would make sense with a limited opportunity and small market. I wouldn’t want to start re mapping as that's the warranty gone!

How many markets require the PF?

Sandy59

2,282 posts

156 months

Sunday 25th August
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To be honest I haven't read anything, or heard anything from various YT videos, that concerns me in the slightest regarding the performance or exhaust noise of this new PF equipped car.
Even if there is an after market exhaust system offered in the future I'm pretty sure I won't be bothering with it.

Juno

3,651 posts

194 months

Sunday 25th August
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Cheib said:
gt3rswp said:
Thank you - I did read that. However how accurate is it likely to be and if that is the case does it point towards ITB's and loss of the rear silencers? In reality - Porsche are the only people who know the truth and until the 1st cars start arriving it's all speculation.
I think they are decent in that they seem to have access to Porsche/don’t make st up like Autocar.....there’s an interview with the guy that’s been running 911 prodiuction for the last 18 years in this months edition as an example. They had an interview with the CEO a few months ago.
Well it looks like what was posted back in April was spot on!

Porsche guy

2,672 posts

172 months

Sunday 25th August
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Sandy59 said:
if there is an after market exhaust system offered in the future I'm pretty sure I won't be bothering with it.
+1

Juno

3,651 posts

194 months

Sunday 25th August
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Porsche guy said:
Sandy59 said:
if there is an after market exhaust system offered in the future I'm pretty sure I won't be bothering with it.
+1
+2

BrntRubber

292 posts

29 months

Monday 26th August
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Juno said:
Porsche guy said:
Sandy59 said:
if there is an after market exhaust system offered in the future I'm pretty sure I won't be bothering with it.
+1
+2
I am still shocked by how much a simple centre bypass changed the personality of my Touring. Frankly, I think they should have come from the factory like that. It was aggressive and just what she needed. I do miss my Touring, but she had to go.

I will definitely be upgrading the vocal chords on the 3RS as long as she can be returned to stock and won’t require a remap as I would ever remap a car like this. A significant weight savings will result but that is just a bonus for me.

Edited by BrntRubber on Monday 26th August 21:39

Juno

3,651 posts

194 months

Monday 26th August
quotequote all
BrntRubber said:
Juno said:
Porsche guy said:
Sandy59 said:
if there is an after market exhaust system offered in the future I'm pretty sure I won't be bothering with it.
+1
+2
I am still shocked by how much a simple centre bypass changed the personality of my Touring. Frankly, I think they should have come from the factory like that. It was aggressive and just what she needed. I do miss my Touring, but she had to go.

I will definitely be upgrading the vocal chords on the 3RS as long as she can be returned to stock and won’t require a remap as I would ever remap a car like this. A significant weight savings will result but that is just a bonus for me.

Edited by BrntRubber on Monday 26th August 21:39
The trouble is the manufacturer is bound by rules and regulations!

Remap out of he question for me and must be able to go back to stock!!! I’m not sure they will be able to do it without a re map though,let’s see?

Cheib

16,778 posts

120 months

Tuesday 27th August
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Taffy66 said:
Miglior said:
I’ve got this to ppf this week. “Gen 3” PTS RS.

Lovely thing
Yep, got to be the nicest colour spec RS i've seen...Classy and timeless IMO unlike LG.
More pics of this car have just been posted on Instagram. Jet Green Metallic at OPC Kendal...my OPC delivered a Jet Green Turbo S about 18 months ago which looked stunning.

https://www.instagram.com/p/B1rGdNVCW_x/?utm_sourc...

Mentions Miglior as the Detailers... who Iook to have done an incredible job.

Porsche911R

17,304 posts

210 months

Tuesday 27th August
quotequote all
BrntRubber said:
I am still shocked by how much a simple centre bypass changed the personality of my Touring. Frankly, I think they should have come from the factory like that. It was aggressive and just what she needed. I do miss my Touring, but she had to go.

I will definitely be upgrading the vocal chords on the 3RS as long as she can be returned to stock and won’t require a remap as I would ever remap a car like this. A significant weight savings will result but that is just a bonus for me.

Edited by BrntRubber on Monday 26th August 21:39
But the car would not be road legal and thus then not insured !

I think people with filters are screwed. And will just have to suffer the downgrade.

MDL111

3,744 posts

122 months

Tuesday 27th August
quotequote all
can't really hear the sound when wearing a helmet anyway smile
don't get why people are so caught up re the sound of track cars, to hear it properly you are (well) above the speed limit on most roads (and for road driving imo it will never sound as good as most V12s at any revs, so if sound is your thing buy a one of those).

Juno

3,651 posts

194 months

Tuesday 27th August
quotequote all
Porsche911R said:
BrntRubber said:
I am still shocked by how much a simple centre bypass changed the personality of my Touring. Frankly, I think they should have come from the factory like that. It was aggressive and just what she needed. I do miss my Touring, but she had to go.

I will definitely be upgrading the vocal chords on the 3RS as long as she can be returned to stock and won’t require a remap as I would ever remap a car like this. A significant weight savings will result but that is just a bonus for me.

Edited by BrntRubber on Monday 26th August 21:39
But the car would not be road legal and thus then not insured !

I think people with filters are screwed. And will just have to suffer the downgrade.
It’s not a downgrade you Feckless Muppet,now get on with your 50Th Celebrations and mind a GPF don't sink your Canoe hehe

gt3rswp

Original Poster:

64 posts

5 months

Tuesday 27th August
quotequote all
Juno said:
It’s not a downgrade you Feckless Muppet,now get on with your 50Th Celebrations and mind a GPF don't sink your Canoe hehe
+1 sleep

Gitana991

89 posts

5 months

Tuesday 27th August
quotequote all
Juno said:
Porsche911R said:
BrntRubber said:
I am still shocked by how much a simple centre bypass changed the personality of my Touring. Frankly, I think they should have come from the factory like that. It was aggressive and just what she needed. I do miss my Touring, but she had to go.

I will definitely be upgrading the vocal chords on the 3RS as long as she can be returned to stock and won’t require a remap as I would ever remap a car like this. A significant weight savings will result but that is just a bonus for me.

Edited by BrntRubber on Monday 26th August 21:39
But the car would not be road legal and thus then not insured !

I think people with filters are screwed. And will just have to suffer the downgrade.
It’s not a downgrade you Feckless Muppet,now get on with your 50Th Celebrations and mind a GPF don't sink your Canoe hehe
I am quite sure it will feel very special to all owners of the batch 2. I heard the car (not mine still to come) and without sport exhaust on, i felt it was a bit muted. But it still sounds nice and n/a and revs. We might have lost some of the pops. But I am very excited to have the car coming. I remember when I got the GT2 RS many people were telling me it wasn’t a GT because it had a reworked Turbo engine and it sounded like sh... first time I turned the engine on, I was in love, I love the turbo noise/ whistle. And now it seems many people think it is one of the greatest 991 - not trying to open another thread. So... I think it is harsh to call the second batch 3 RS a downgrade and... regardless, I am really looking forward to collect her and I have already planned my first 500 miles trip with my son for what will be a great driving moment I am sure!

MDL111

3,744 posts

122 months

Wednesday 28th August
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Exactly - they all sound fine and an RS has so many other qualities that make it special not only sound

Porsche911R

17,304 posts

210 months

Wednesday 28th August
quotequote all
Juno said:
It’s not a downgrade you Feckless Muppet,now get on with your 50Th Celebrations and mind a GPF don't sink your Canoe hehe
But it is though, you cannot mod it and it won't sing like the 991.2 RS with a bypass, it's car heaven a 991.2 with a bypass pipe at WOT.
Also worse balance, yes they offset with the side deletes but the weights more to the rear now plus a Steel system over the trick Ti system ,so all the weights now hanging out the back !



Is what it is and not a lot they could do, it's a better solution than the new GT4's but it's still a shame the 3rd batch did not make it though sans filters and they ditched the Ti exhaust.

2nd hand buyers will hunt out the non filtered cars imo, well I would as cars sounding like that will never happen again period.

Having one with a filter is better than not having a car though and they will sell at overs so a free car for the lucky few.
Porsche did what they could to offset the weight as best they could having been forced to fit the filters.


throt

1,978 posts

115 months

Wednesday 28th August
quotequote all
Porsche911R said:
Juno said:
It’s not a downgrade you Feckless Muppet,now get on with your 50Th Celebrations and mind a GPF don't sink your Canoe hehe
But it is though, you cannot mod it and it won't sing like the 991.2 RS with a bypass, it's car heaven a 991.2 with a bypass pipe at WOT.
Also worse balance, yes they offset with the side deletes but the weights more to the rear now plus a Steel system over the trick Ti system ,so all the weights now hanging out the back !



Is what it is and not a lot they could do, it's a better solution than the new GT4's but it's still a shame the 3rd batch did not make it though sans filters and they ditched the Ti exhaust.

2nd hand buyers will hunt out the non filtered cars imo, well I would as cars sounding like that will never happen again period.

Having one with a filter is better than not having a car though and they will sell at overs so a free car for the lucky few.
Porsche did what they could to offset the weight as best they could having been forced to fit the filters.
My service guy stated that they are definitely muted. But it is what it is, all going to be like it so it’s no biggie.

They’ll be a few owners locking away their non filtered cars now. Crazy , I know.

A1mjb

130 posts

92 months

Wednesday 28th August
quotequote all
Just been told another delay due to my
Car awaiting deviated stitching anyone
Else been told this ?