GreenLantern

I'm not necessarily talking about fitment, but programming. It takes a lot of fine tuning to get the ECU maps right. And previously, they didn't have the resources / time to do both PDK-S and MT, which is one of the reasons AP gave for the GT3 coming out with PDK only.

neanicu

That would not have been their only challenge. They would've had to relocate the E-diff pump that now sits inside the PDK,plus modifications to the suspension and drive train.
Porsche is more than capable of doing it,but they didn't want to spend the money.

GreenLantern

rave426

I'm number 1 on one list for this car. I hope it doesn't disappoint and end up not being much lighter and less powerful than the current GT3.

GreenLantern

Likewise. Though, if rumors are correct, there'll be a bunch of 918 Spyder VIP's left without an alloc.

Macca

Just catching up on threads as have spent 7 of last 9 days at the track and then international travel...

The thing I find hard to believe in recent posts relate to the engine output and possible max rpm. I personally doubt the car will debut with more power than the RS. Without a wing and a GT3/RS badge that would seem a very unusual move to me. Getting another 50 bhp from the 4.0L unit is no mean task if reliability is required. The specific utput per litre at 125 thereabouts could move in the next few years to 130 but i dont see it going any higher without compromise. I think 9000 rpm is the headline for a road car. Until PAG have more experience from running the 9A1 in Motorsport this year I think they would be very foolhardy to g beyond the 8600/8800 limit of the GT3RS. They are already paying the price for the GT3 going to 9000 and I personally believe the 991 GT3 will probably end up having the highest redline for a NA engine in Porsche production car history for a long time. Making a 50 hour flat 6 engine at 126bhp/L that runs to 9000 for 40-50 hours without replacing parts is one thing, and its borderline acceptable fr a production road/track car. Making a 4.0L that runs 135 bhpL to 9000 rpm for 50+ hours is a whole different ball game. PAG must be smarting already at the cost of the 991 GT3 program and I personally believe this story is still unfolding. By the time they finish they will have lost alot of money on that car to make it a 100hr reliable engine. Jury is still out on RS 4.0L engine but at least now with the Motorsports program the issues will become known and addressed quickly. Theres a good reason they didnt campaign the 500bhp 4.0L 997 4.0RS engine in Cup and club racing and stayed with 3.8. If you sampled the 4.0L 997 RS owners around the wrld who used their cars extensively on track in the first 2-3 years of ownership you would find there were alot of "warranty replacements"...

Just my 2c worth and personal views...

Just in time

Fully agree with Macca. Porsche has to be more than capable of extracting more HP but durability will suffer. Look at F1 engines. They have extremely high output but are only good for a few races and then become scrap metal. I have to think that PAG's target has to for the engine to be good for at least 100k miles.

GrantG

As a data point, the 2-year old 458 Speciale makes 133 hp/L and the 918 Spyder makes 132 hp/L from their V8's, but the cylinders (and forces) are smaller.

-eztrader-

Maybe Porsche will just drop the 918 v8 in the 911R, with a 6 speed manual :

GrantG

Ruf did something similar - shame they never received certification.

Macca

Grant. Yes the Speciale is the benchmark of the era. It was built and designed at the same time as the GT3+RS and definitely holds mantle. As you say the pistons are smaller/lighter and the forces to run up to 9000 somewhat less. Also worth noting is that in terms of durability the 458 V8 has a shorter hour service interval and life time of components I am led to believe. I am not on the Fezza board actively but I suspect there are few there with 458SP that have clocked up 5-7000 track miles on their cars without any engine work in the last 18 months as we have GT3 owners on this board. That said I happily stand corrected. My understanding is the 458 engine is tuned closer to the edge of the envelope than the typical Porsche GT product...

TRAKCAR

8000 mostly track miles. Flawless

bronson7

It's only b/c you did the proper break-in.

GreenLantern

8000 mostly track miles with your 991.1 GT3 RS?

usctrojanGT3

Trakcar is using what the car was designed for...not being a garage queen. And if I buy it from him, I will continue tracking it.