718 GT4RS
#811
Addict
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#812
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Are you saying the left 718 gt4 graph is hub dyno and the right 991.1 gt3 graph is wheel dyno? My understanding is that they are the same, otherwise why post them in response to a question about comparing them? If so, the point is in the comparison, not the absolute numbers. The 718 gt4 makes more hp at every rpm.
#813
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However don't get me wrong, I love a mid-engine Porsche. My first P-car was a 987.2 Boxster S and I'm considering adding a Boxster GTS 4.0 in the future, but regarding this test, I think that 718 fanboys are losing a realistic perspective.
Last edited by Drifting; 08-30-2020 at 07:57 PM.
#814
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John
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ajw45 (08-30-2020)
#816
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https://rennlist.com/forums/718-gts-4-0-gt4-gt4rs-spyder-25th-anniversary/1198631-how-does-the-718-gt4-compare-with-981-gt4-and-991-1-gt3-on-track-5.html
“718 GT4 is around 2s faster per lap than the 981 GT4 around Silverstone GP Circuit. I would imagine half of that is made up by the N0 to N1 tyre, quite a nice step.
The time I've completed at Silverstone GP in our 718 GT4 is faster than any 991.2 GT3 time that I have seen around there. Make of that what you will but the 718 GT4 is a nice step up from the 981 absolutely no question.
JC”
Goal is to get to the bottom of conflicting data, that’s all. I see no 718 or 991 fanatics here.
It’s commonly known that Porsche under rated the HP of the 996.2 GT3 and that the real HP is much higher than the official 380hp, some say over 400hp. So it wouldn’t be the first time for Porsche to be playing HP games to fit their marketing plans.
#817
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Porsche has said publicly multiple times that they pull motors off the line and dyno test them, and any motor testing more than plus or minus five percent from rated hp gets pulled and broken down to determine why it is off. They’ve been doing this for years. There is no way the GT4 is that far underrated or that the GT3 is that far overrated, regardless of what one dyno says (testing on different days). A 60hp swing? Really, you think Porsche actually gave the GT4 way more hp or screwed GT3 buyers that badly? Occam’s Razor would tell us the most likely explanation is different dyno conditions. I’d love to believe that Porsche gave us 450hp for the price of 414, but I doubt it. And I really think reviewers would have noticed it by now.
And lap time isn’t just about hp.
And lap time isn’t just about hp.
Last edited by Archimedes; 08-30-2020 at 07:58 PM.
#818
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Exactly! Truly objective dyno evidence would bear this out. The 718 has more consistent power and torque throughout the rev range than the 981, but it's not suddenly a godzilla of power.
#819
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The changes I see...
1. goose neck huge rear wing
2. front fender vent (above the front wheels and behind the front wheels)
3. naca duct in frunk to cool brakes
4. centerlock wheels
5. some kind of modification to front air curtains as it's covered up
6. some kind of vent where the rear quarter windows are
questions...
1. is frunk carbon fiber
2. are front fenders carbon fiber
3. is the car any lower than GT4 and Spyder
4. how is pdk tuned for this car/different hardware?
5. rear exhaust tips look larger
6. magnesium wheels
1. goose neck huge rear wing
2. front fender vent (above the front wheels and behind the front wheels)
3. naca duct in frunk to cool brakes
4. centerlock wheels
5. some kind of modification to front air curtains as it's covered up
6. some kind of vent where the rear quarter windows are
questions...
1. is frunk carbon fiber
2. are front fenders carbon fiber
3. is the car any lower than GT4 and Spyder
4. how is pdk tuned for this car/different hardware?
5. rear exhaust tips look larger
6. magnesium wheels
#821
Race Director
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Originally Posted by Mech33
Front fenders / arches are wider as well, probably to fit wider front rubber. Happy to see some custom fender work. Wish they would make the rear humps wider as well...
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However, the coolest new attribute which distinguishes the GT4RS from any GT product before it, are the rear quarter based intakes which will feed cold ram-air to the engine finally. I'm very curious how much this will take away from rear trunk space, and what it will do for noise in the car (some intake noise is welcome).
I'm stealing BGB Motorsports images of their custom made retrofit system from another thread to help visualize what these will look like/work like.
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https://rennlist.com/forums/gt4/8822...ential-74.html
Last edited by CAlexio; 08-31-2020 at 02:42 AM.
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#822
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I can’t see a cloodge job like this for production. I think they would somehow use those std storage cubbies under the rear windows, eliminate those, and instead use that space to feed air into the engine compartment. Would it be as efficient? Don’t know. But it would solve some space issues by not having/using big feeder tubes.
#823
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I can’t see a cloodge job like this for production. I think they would somehow use those std storage cubbies under the rear windows, eliminate those, and instead use that space to feed air into the engine compartment. Would it be as efficient? Don’t know. But it would solve some space issues by not having/using big feeder tubes.
#824
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Maybe they are brake cooling ducts for the rear? I cam hear the machine guns being cocked as I type!
#825
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if we speculate in that direction....I would use the lower ones for brake cooling (and some compartment engine air circulation) now that the engine breaths through he new ones