CAlexio

That I'm not sure.. but my best guess is also category breaking.. closer to base Gt3 than GT4?

sin911

I really doubt Porsche will use the GT3 engine or give it more than 450 HP for the GT4 RS. It will be stepping on GT3s toes in terms of performance and they will have to significantly increase the price over the GT4. Hey, I have been wrong before! I did not think Porsche was designing a unique 4.0L engine for the 718 GT4/Spyder either, believed Porsche would use the same engine from 981 generation but simply give it a boost like in the 718 Clubsport.

If Porsche does put the GT3 engine in a GT4 platform, I would be very curious about the performance of the GT4 RS vs GT3!

Warwick Morris

Numerous discussions on this on the old 981 GT4 Channel. GT3 engines cannot work because of the dry sump tank. There is simply no room. Should the RS GT4 eventuate you can bet on an X51-type kit (cams, heads, intake and headers) and maybe a small capacity increase. It will be a fanatastic car for sure and worth the wait.

Avaley

I'm just speculating based on the media rumors but even if it comes stock around 450 this car would make a stellar performer and be very competitive around the Nring with cars that cost way more. Could also just give the GT4 RS @JCR-Porsche, throw on the GT4 "JCR TITANIUM SILENCED VALVED RACE PIPE / JCR TITANIUM OPF DELETE / JCR INCONEL RACE MANIFOLDS - 413.68WHP/321.87WTQ (475.28HP/370.15TQ)" on the RS and i'm sure that car is 500 brake and close to 400wtq.

"There are even bigger changes along the sides where the inlets grow larger, and there are now vents in the side windows to send even more air to the mid-mounted engine. The rear gains a wing with swan-neck mounting and large endplates. The exhaust pipes seem to have a larger diameter, too." From the original article: https://www.motor1.com/news/451735/p...-gt4-rs-video/

The rumors for approaching 500 came from here: https://www.caranddriver.com/news/a3...onfirmed-2022/

Avaley

I also think Porsche needs to address the elephant in the room, the coming C8 z06, zr1, zora, which will have more output and I'm trying to stay optimistic they will surprise us. Perhaps their plan is to make the coming 2022 992 GT3 RS even that much better?

jmartpr

So....where do you think Porsche will get the extra power from the same 9A2 engine if indeed the GT4 RS happens?
Probably the exhaust system, and a little ECU tuning....same recipe the aftermarket is bringing now for the GT4
So don't count on adding all those ponies that JCR is mentioning on top of the 450, 465 or 475 quoted all over the place....the media is more clueless than RL.
If you ask me they will play with the above mods get max 450 reliably and call it a day.....for the engine.

The RS recipe is not about redesigning the engine with lots of power on top of the regular GT version.....it's a whole package of suspension, aero, weight, few extra ponies and whole lot more $$$$
On the GT4 RS they do have limits...can't be too close in pricing or performance to a GT3 and need to have enough distance (just enough) from a regular GT4.
Keep this in mind,,,,We still don't know the specs of the new 992 GT3 but I highly doubt it will be more than 525...probably use the same tech on the Speedster (ITBs, etc).
If you have a GT4 RS at 475.....that's just too close for comfort to the GT3.

rooster17

I don’t think the Corvette is the elephant in the room. The corvette has been a cheaper higher output car forever. For example, the 718 GT4 just barely nudges out the 16 year old C5 Z06 by a whopping nine HP.

TRZ06

The difference this time around though is it is now mid-engined, and has the interior & interior materials worthy of a 6 figure price tag (in 3LT form). In addition, a DCT gear box AND 8,500 to 9K redine from the 5.5L NA motor in the C8R race car.

People keep brushing off the upcoming C8 Z06 (understandable in a Porsche forum), but I'm telling you I think it is going to be different this time around.

My timing for replacing my SS 1LE is going to be the PDK GT4, however if GM nails the C8 Z06 and it gets good reviews and doesn't have major issues, I am not ruling out trading the GT4 for it after the hype wears down and the prices start to get discounted.

The C8 Z06 (without the Z07 package) is going to have 275 and 335 F/R tire sizes ( That is A LOT for a mid-engine car. I bet you see 1.25 stock lateral G limits on the base Z06 (Cup 2's) and 1.3 G's with the Z07 package (Cup 2 R's), along with 2.6ish 0-60 times. GM also has AMAZING traction control/stability systems (with PTM Modes), E-diff., and MRC shocks (or maybe DSSV's from the ZL1 1LE). The C8 Z06 will be a game changer for the mid-engine market IF GM pulls it off without any major issues.

CAlexio

^^^^^

I completely agree. This will be a massively exciting car with that engine and yes.. 335 rear wheels.. and wider track, the grip this will generate will be immense. Now the question is whether they are going to go full crazy with the aero and include those movable side flaps from the USPTO drawings.

I find the c8 simply hideous looking.. but with performance specs like these and flat crank NA v8... I'm in, couldn't care less what it looks like. I am VERY curious how they are going to develop a vibration-acceptable engine at that size.. normally flat crank v8's have issues when piston size gets bigger than 500cc... this will be a 688cc piston.. maybe some kind of magnetorheological engine mounts?

FRIZ

For what it is worth , I have been second on a list since March of 2015 for the GT4 RS and also have bought 4 GT cars in the last 10 year from this dealership .
Recently I was there at an open house to test drive a Taycan ( very cool by the way ) and the GM mentioned that it would be late 2021 and they might be numbered addition , very limited and if that is the case , I would have a slim to none chance of getting a car ;-(

Did not leave feeling good about it .......

TRZ06

They use the motor already in the C8R race car, so I think they have a good leg up already. Obviously the production car will be more powerful than the C8R is (as crazy as that is), so the question is will they be able to maintain that reliability with whatever power increase they give it.

Westcoast

Wow, that's a bummer, but don't give up, you never know, they might get 2 allocations in the end... stay positive!

ExMB

When was the last time GM promised something out of the box and it was true?

I thought the previous gen looked like a Transformer wanna-be. This new gen upped it which I didn't think was possible.

CAlexio

Regarding first statement... it definitely seems like this flat crank v8 engine is already in mules based on sound clips:


And regarding second statement... LOL you're so right.

JSF101

I was second on dealer list in Feb 2015

I left dealer 6 months ago and felt like I should just FUGETABOUTIT

this is the path of unintended consequences from the 918 VIP program
a way for Porsche to separate the big spenders/flippers from the proletariat
buying 4 cars in 10 years doesn't get you a ticket to the dance