GrantG

It would make no sense (actually counterproductive to have so much more negative camber gain on the front than in rear under load) to use the double wishbones in front and leave the stock McPherson struts in the rear. But if they did transplant that front double wishbone suspension into the 4RS and then use a multi-link rear suspension (like AutoQuest one), that would have huge potential.

jmartpr

That would be awesome (and the right way to do it) but also the price to modify the body-in-white to make this work....it will keep the front and rear strut suspension.

Avaley

how much lightweighting are we expecting the RS to have? The GT3 AP claims 3153 lbs wet, the GT4 PDK is 3276. I would imagine the RS to have quite a bit of carbon fiber and light weighting to be less than a GT3, possibly 3100 lbs or less?

Avaley

I feel that a large gain will be had simply with the PDK, which we don't have a lap time for the GT4 PDK yet either.

I think the GT4RS will be closer to 20 seconds, ie 7:10 after accounting for a torque and power bump, light weighting, more aero, tires and PDK. just imho.

GrantG

The PDK-S on the GT3 saves 3 seconds on the Ring and a fraction of a second on most short tracks in the US (0.2 sec at Willow Springs with Randy Pobst).

horns

It will probably weigh the same as the pdk GT4. It will have bigger tires/wheels, and probably a few other bits that will offset the weight reduction items.

Avaley

why would a GT4 weigh more than a GT3, which is a larger car with a longer wheelbase?

RS cars are known for their extensive use of aero and carbon fiber even more than GT cars. Minimum 100 lbs less with optional magnesium centerlocks, carbon fiber bonnet, carbon fiber wing and stripped interior of some creature comforts. wheels will be same size based on the same diameter wheel well.

it saves half second to 60 as advertised from the factory, my sense says itll save more than 3 seconds on the ring given suboptimal gearing on the 6mt.

GrantG

Exactly - 0 to 60 is where PDK shines (initial launch). Negligible difference on a typical shorter flying lap where there is no launch and Ring has very few slow corners (tall second gear is a benefit there).

The 3 second Ring delta was a direct quote from Porsche’s top test driver when the 991.2 GT3 was being measured for official times.

The GT4 manual gearing is suboptimal when canyon carving at lower speeds, but it’s very good on the Ring and Autobahn.

PDK is heavier and less efficient (loses more power as heat in its wet clutches, around 10hp).

Also, are you sure GT4 has shorter wheelbase than GT3? Not important, but usually the mid-engined cars have a longer wheelbase than 911 (which pushes its rear wheels forward to make room for engine behind the rear axle).

CAlexio

No real light weighting... just aero, stiffer suspension, a bit more power, some flair.

KelvinC

GT4 (981 and 982) wheelbase is longer than both 991 and 992 GT3.

jmartpr

Agree on all of this......IMO Ring times are meaningless for most of us and have become a large marketing tool for manufacturers. You really have to go into the details of each car.

jmartpr

It may be lighter than a GT4 PDK but not by much.,,,you are adding weight savings like the parts already on the car don't weight anything and are super heavy.
For example the hood on the GT4 is alloy and while the carbon does save weight it's not a lot. If it has a bigger wing? More weight? Magnesium wheels....20 lbs for the 4 wheels savings?
A good estimate could be the difference between GT3 vs GT3RS (991.2) and then adjust it to a even smaller reduction since you are paying less than for a GT4RS than a GT3
Also...who says that PAG wont consider a heavier GT4RS just to make sure it doesn't outshine the GT3?

Buteo

GT3RS is a wider body car than GT3. Not necessarily apples to apples with RS having turbo body.

Would be surprised if PAG creates a wider body GT4RS. So the RS treatment may reduce weight further than what we see in weight comparison of GT3RS vs GT3.

ExMB

IIRC the GT3 was weighed under the old regulations which permitted extra cost option to be added to drive the weight number down whereas the GT4 is under the new regulation which no longer permits that.

lovetoturn

Couple of points to be made here on this comparison of normal to RS models. With a regular GT4 we can already lighten our cars quite a bit with just removing extraneous stuff, adding a quality lithium battery, 19 inch forged wheels, lighter exhaust components, and removing the passenger seat.

1. Lithium from Antigravity H6-40-RS loses 33 lbs
2. Forgeline VX1R (9-19 & 11-19) inch wheels loses 19 lbs
3. Removing the air pump, tire sealer, the two frunk tool holders, carpet mats, rear hatch net and cover, and the plastic battery shock tower cover will shed about 18 lbs.
4. OAP upgrade in stainless loses 11 lbs, while OAP in titanium loses 15 lbs.
5. Mufflered exhaust upgrades can be from 0 to 7 lbs for stainless and up to 20 plus lbs for inconel or titanium.
6. Removal of the passenger seat for a serious track day deletes another 38 lbs for a LWBS. Just four bolts and one electric connection to remove it.

So some modifications, of which we are all likely looking at, can total up to quite a large loss of weight. In my case, I am potentially looking at 33+19+18+15+20=105 lbs and if I take the seat out for a few key events a year then it can be another 38 lbs for a grand total loss of 143 lbs. That is a lot of weight as compared to stock! Now all this can be done to an RS as well, but it I wouldn't expect any huge weight losses from Porsche on the RS to total up to any thing like the above numbers here. Point being, that you don't need an RS to significantly lighten your car. There is a cost to most of this weight loss, but 18 or 56 lbs of it can be for free for any given track weekend.