Your Prediction: NEXT GT4 Engine
10-29-2017, 04:55 PM
#1
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Thread Starter
Your Prediction: NEXT GT4 Engine
Ok guys, assuming we will get a .2 GT4. What will be the next powerplant? We know it will be an NA engine based on many interviews with the GT boss. So, will we be lucky enough to get the old 991.1 GT3's 9k beast mode engine? Personally I think it would be an insanely awesome addition to the GT4, but I'm not optimistic on this because I think it would put the GT4 way too close to the GT3 in terms of performance. Coupled with the mid engine layout I would say they won't do this. Would love to hear your thoughts on the next GT4's possible powerplant.
10-29-2017, 05:19 PM
#2
Rennlist Member
I don't think you want an old 991.1 GT3 engine. I traded my 991.1 GT3 because of that engine. A derivative of the .2 engine would be nice and the beta testing will be done on the new GT3.
10-29-2017, 06:16 PM
#3
If NA as believed, most likely candidates would be detuned variant of the new 4.0L from 991.2 GT3. If they go this route, to differentiate enough, wouldn’t surprise me if they not only lower the red line but also maybe reduce the displacement (shorter stroke, less exotic rods...?) to make it a 3.8. Going this direction would put the GT4 in same fundamental engine platform Porsche is using on new GT3, GT3 RS, etc.
Other option that seems to me more in character with GT4 would be to stick the 3.8L from. The 991.1 GTS into it, with that “power kit”. So then engine would be similar to current GT4, except that in place of a “detuned” 911 Carrera S engine, it would be the tuned up version of that same engine used in the late 991.1 911 Carrera S/GTS/50th Anniv edition.
Personally, I think the latter option would be most reasonable and would be a very desirebale package in terms of refinement and power and durability, etc. But it may be that Porsche is no longer making that engine anymore and doesn’t want to anymore.
whatever they do, I predict HP will be kept around 430hp or less.
Other option that seems to me more in character with GT4 would be to stick the 3.8L from. The 991.1 GTS into it, with that “power kit”. So then engine would be similar to current GT4, except that in place of a “detuned” 911 Carrera S engine, it would be the tuned up version of that same engine used in the late 991.1 911 Carrera S/GTS/50th Anniv edition.
Personally, I think the latter option would be most reasonable and would be a very desirebale package in terms of refinement and power and durability, etc. But it may be that Porsche is no longer making that engine anymore and doesn’t want to anymore.
whatever they do, I predict HP will be kept around 430hp or less.
10-29-2017, 06:39 PM
#4
If NA as believed, most likely candidates would be detuned variant of the new 4.0L from 991.2 GT3. If they go this route, to differentiate enough, wouldn’t surprise me if they not only lower the red line but also maybe reduce the displacement (shorter stroke, less exotic rods...?) to make it a 3.8. Going this direction would put the GT4 in same fundamental engine platform Porsche is using on new GT3, GT3 RS, etc.
Other option that seems to me more in character with GT4 would be to stick the 3.8L from. The 991.1 GTS into it, with that “power kit”. So then engine would be similar to current GT4, except that in place of a “detuned” 911 Carrera S engine, it would be the tuned up version of that same engine used in the late 991.1 911 Carrera S/GTS/50th Anniv edition.
Personally, I think the latter option would be most reasonable and would be a very desirebale package in terms of refinement and power and durability, etc. But it may be that Porsche is no longer making that engine anymore and doesn’t want to anymore.
whatever they do, I predict HP will be kept around 430hp or less.
Other option that seems to me more in character with GT4 would be to stick the 3.8L from. The 991.1 GTS into it, with that “power kit”. So then engine would be similar to current GT4, except that in place of a “detuned” 911 Carrera S engine, it would be the tuned up version of that same engine used in the late 991.1 911 Carrera S/GTS/50th Anniv edition.
Personally, I think the latter option would be most reasonable and would be a very desirebale package in terms of refinement and power and durability, etc. But it may be that Porsche is no longer making that engine anymore and doesn’t want to anymore.
whatever they do, I predict HP will be kept around 430hp or less.
10-29-2017, 06:49 PM
#5
Rennlist Member
10-29-2017, 07:08 PM
#6
Three Wheelin'
We all hope it's a detuned 4.0 in the 430ish power range.
Realistically, I see the X51 package- stronger tuning of 3.8 from current GT4 with power in the 410hp range.
Id be quite surprised if we see power >25hp bump. But I love being surprised
Realistically, I see the X51 package- stronger tuning of 3.8 from current GT4 with power in the 410hp range.
Id be quite surprised if we see power >25hp bump. But I love being surprised
10-29-2017, 07:19 PM
#7
IF they build another one (I still think it's currently a big if) - I'm going with a turbo 4 model.
I know there is a theory that Porsche will only build NA GT cars - but the GT2 already says otherwise.
The only NA engine they have left in the parts bin is the GT3's 4.0L and I don't see that going into a Cayman. I'm not sure if the 3.0L TT fits into a 718 which leads me to think any future hypo croc will be a T4.
I know there is a theory that Porsche will only build NA GT cars - but the GT2 already says otherwise.
The only NA engine they have left in the parts bin is the GT3's 4.0L and I don't see that going into a Cayman. I'm not sure if the 3.0L TT fits into a 718 which leads me to think any future hypo croc will be a T4.
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10-29-2017, 08:23 PM
#8
IF they build another one (I still think it's currently a big if) - I'm going with a turbo 4 model.
I know there is a theory that Porsche will only build NA GT cars - but the GT2 already says otherwise.
The only NA engine they have left in the parts bin is the GT3's 4.0L and I don't see that going into a Cayman. I'm not sure if the 3.0L TT fits into a 718 which leads me to think any future hypo croc will be a T4.
I know there is a theory that Porsche will only build NA GT cars - but the GT2 already says otherwise.
The only NA engine they have left in the parts bin is the GT3's 4.0L and I don't see that going into a Cayman. I'm not sure if the 3.0L TT fits into a 718 which leads me to think any future hypo croc will be a T4.
10-29-2017, 08:47 PM
#10
GT4 or GT4 RS ?
Is everyone speculating on the GT4 or GT4 RS. Which one is the more likelier ??.
Is it safe to assume that the Australian leak of the next GT4 RS is indeed just a rumor or do we think that we could see a GT4 RS before the GT4 or in lieu of it.
Is it safe to assume that the Australian leak of the next GT4 RS is indeed just a rumor or do we think that we could see a GT4 RS before the GT4 or in lieu of it.
10-29-2017, 08:55 PM
#11
Everybody needs to keep in mind that EURO 6 emissions will be in effect at the time that a GT4(RS) will be certified for release. While I too am hoping for a NA engine it will take effort on PAG to come up with one. Its not impossible but it also may be reflected in the pricing due to being a limited application.
10-29-2017, 09:48 PM
#13
Three Wheelin'
New car will be 718 GT4
10-29-2017, 10:00 PM
#14
Pro
Everybody needs to keep in mind that EURO 6 emissions will be in effect at the time that a GT4(RS) will be certified for release. While I too am hoping for a NA engine it will take effort on PAG to come up with one. Its not impossible but it also may be reflected in the pricing due to being a limited application.
I am a buyer if it is the detuned 4.0, and will pass if it is a variant of the 991 or turbo-4.
10-29-2017, 10:24 PM
#15
Rennlist Member
Porsche's thoughtful/deliberate product positioning is something that is super interesting and super annoying to me...
1. 718 Product Range
The recent 718 GTS release with a 15hp bump matches the 981 GTS bump. No surprises so far in the 718 line. A similar bump from 981 GTS to GT4 would put a 718 GT4 at ~410hp.
2. 718 vs 991.2
The 981 GTS was 10hp down from the base 991.1 and the GT4 was 15hp down from the 991.1S. The 718 GTS was released a perfect 5hp down from the 991.2 base. If we close the gap a little between the 718 GT4 and the 991.2S (420hp) we're somewhere around 410hp.
3. GT4 vs GT3 Positioning
The 991.2 GT3 received a 25hp bump with the move to the 4L. A similar bump would maintain the hp gap between the GT3 and GT4 put the GT4 at 410hp.
5. Cost
The GT4 is still the entry level GT car so it needs to come in significantly less expensive than the GT3. Revs cost money. 9k rpm is going mean dry sump, titanium engine components, magic no adjustment adamantium solid valve lifters, dlc coated cams, etc. Oh, and 9k rpm means a whole new gear set too. I'm guessing no change to the redline and no fancy GT3 heads/intake, something more like the current engine. Changing the crank spec to stroke the engine to 4L however costs Porsche almost nothing.....
5. Torque
The GT4 Clubsport is pretty down on power where everything else is blown and/or a v8. Plus, with the 718 and 991 lines gone turbo, there's a huge mid-range torque gap to keep up with. Even though Porsche would have no problem getting 410hp out of the 3.8, I bet they'll go 4.0 for the extra torque partly for racing, partly to keep up in a torquey turbo world, and hey, it'll be great for marketing.
Conclusion - I think we'll see an ~410hp NA 4L that's more similar to the current 3.8 than the new GT3's 4.0. Whichever is easier to certify but whether its on the new GT3 engine architecture or not, they won't let it breath and run a lot of revs to compete with the GT3. The old 3.8 made 400hp in the 991.1S so really all Porsche needs to do is stroke it and put in the proper 911 airbox and tb to get the power they want. No fancy materials, no dry sump, easy, reliable, and gtg.
I bet the bigger news and decrease in lap times over the 981 will be introduction of PDK
1. 718 Product Range
The recent 718 GTS release with a 15hp bump matches the 981 GTS bump. No surprises so far in the 718 line. A similar bump from 981 GTS to GT4 would put a 718 GT4 at ~410hp.
2. 718 vs 991.2
The 981 GTS was 10hp down from the base 991.1 and the GT4 was 15hp down from the 991.1S. The 718 GTS was released a perfect 5hp down from the 991.2 base. If we close the gap a little between the 718 GT4 and the 991.2S (420hp) we're somewhere around 410hp.
3. GT4 vs GT3 Positioning
The 991.2 GT3 received a 25hp bump with the move to the 4L. A similar bump would maintain the hp gap between the GT3 and GT4 put the GT4 at 410hp.
5. Cost
The GT4 is still the entry level GT car so it needs to come in significantly less expensive than the GT3. Revs cost money. 9k rpm is going mean dry sump, titanium engine components, magic no adjustment adamantium solid valve lifters, dlc coated cams, etc. Oh, and 9k rpm means a whole new gear set too. I'm guessing no change to the redline and no fancy GT3 heads/intake, something more like the current engine. Changing the crank spec to stroke the engine to 4L however costs Porsche almost nothing.....
5. Torque
The GT4 Clubsport is pretty down on power where everything else is blown and/or a v8. Plus, with the 718 and 991 lines gone turbo, there's a huge mid-range torque gap to keep up with. Even though Porsche would have no problem getting 410hp out of the 3.8, I bet they'll go 4.0 for the extra torque partly for racing, partly to keep up in a torquey turbo world, and hey, it'll be great for marketing.
Conclusion - I think we'll see an ~410hp NA 4L that's more similar to the current 3.8 than the new GT3's 4.0. Whichever is easier to certify but whether its on the new GT3 engine architecture or not, they won't let it breath and run a lot of revs to compete with the GT3. The old 3.8 made 400hp in the 991.1S so really all Porsche needs to do is stroke it and put in the proper 911 airbox and tb to get the power they want. No fancy materials, no dry sump, easy, reliable, and gtg.
I bet the bigger news and decrease in lap times over the 981 will be introduction of PDK
Last edited by ajw45; 11-21-2017 at 11:50 PM.