TB993tt

What p!sses me off is that Porsche are well aware of the core technology available, they were using it 20 years ago in the GT2 EVOs. Despite premium pricing for this new model they won't pay for a run of ~$6000 per pair beasties with the specification to support VTG heated 700PS......

S.White

I personally find the water sprayed intercoolers and the hood mounted brake ducts far fetched. Not only are the leaked stories conflicting, the reason why these features would exist is hard to come up with.
Regarding the spray cooled intercoolers;
1. What is it fixing? The NA cars have some power reduction concerns with raised IATs but it doesn't seem to be a serious issue. They didn't address it on the .2 GT3. The Turbo S doesn't seem to have any serious issue that I'm aware of. I don't see many at the track but I assume that is due to reasons other than IATs.
2. Porsche turbo engines haven't had a problem making over 700hp in the past without a water sprayed intercooler. Why do they need it on this one? It also must be a big need if they couldn't avoid it with better ducting or heat shielding.
3. For a RS car meant for all-out track performance, the extra weight of the system and having to re-fill a water tank doesn't sound very Porsche-esque to me. Seems very Hellcat, though. Obviously, Porsche is not interested in playing the horsepower war. They do just fine selling cars with 450-500hp against cars with 650+.
Regarding the hood mounted "brake" ducts;
1. What is it fixing? Has anyone had an issue with their brakes overheating? Porsche didn't address it on the .2 GT3 and it has to slow from greater speeds with less aero drag and more weight than the .1 GT3 RS. Yes, the GT2RS will be faster but we are seeing the same ducts on the .2 GT3RS mule. You'd think the car that needs the extra ducting is the car with less aero drag and more weight.
2. The placement of the ducts doesn't make sense for brake cooling.
3. What happened to the underbody airflow that now requires brake cooling air to come from on top of the hood? Are the GT2RS and GT3RS now lower? Doesn't appear so. Is the splitter lower? Doesn't appear so. Is there a P1/FGT "track mode" suspension lowering option? Doubtful. The tires already rub with a track alignment on the GT3RS. Are there other aero tricks keeping underbody airflow down? Possibly but doubtful especially if running a rear diffuser now and PDK.
3. Maybe the reported Weissach package plays a part in the ducts? What could be removed for a significant weight reduction that the Weissach package typically entails? A/C?

So, basically I'm skeptical of any info coming out for the GT2RS other than; lighter, more powerful, more of the same Porsche we know and love. They aren't having trouble selling their cars. Deviating from the formula with gimmicks and added complexity is not in the Porsche DNA.

GrantG

If you read my post above, pretty sure we're talking about water injection not intercooler sprayers. Running turbo 700hp continuously on track is not at all like running 500hp with an NA motor. Heat soak is a very real issue with turbo motors - water injection will improve power and endurance at the track (times won't diminish with additional laps as a current turbo modded for big power will do).

Brakes on the GT3 and RS haven't had to deal with 700 hp and 553 ft-lbs - additional cooling will be a big (necessary) help. Big downforce will allow the brakes to work even harder - another reason for more cooling.

porscheflat6

100% correct

NateOZ

Seems like a low in Motorsports/RSR connection? Maybe it will be midengined and the 3.8TT used in the RSR next year.

Otherwise it's pretty disappointing to not see the more developed 4.0 being used.

Hopefully the 1000 units is true so I can't get one...

TRAKCAR

Thanks Grant!

GrantG

Of course. I should have said BMW M4 GTS has water injection (not GT4 GTS...)

S.White

I read the post. These are reasons but they are not valid reasons for the solutions that are being discussed (IMO). Porsche was running 700+hp with turbos in endurance racing in the 90s and with less than 3L of displacement. The 997 GT2 RS, is rated at 612hp and doesn't have the aero drag the new 991.2 GT2 RS will have slowing it down. It didn't need extra brake cooling or IAT cooling. The guys who tuned them upwards of 650hp and ran them at the track didn't require it either. They only needed a tune and exhaust and that was on a port injected 3.6L. Assuming the "leaked" information is accurate and there is some sort of added on cooling system with a finite life cycle, this would not add to endurance at peak performance. Being an RS, I have a tough time thinking that Porsche would do this considering the additional burden it places on the owner/operator. M4 GTS? Not so great. Granted it may not be the same system but it's still an additional system that we're talking about.

Also, the 991.2 GT3 RS mule has the same hood ducts. Do you think it will have an increase in power so much so that it requires extra brake cooling when we don't see any of those issues on the 991.1 GT3 RS and they weren't introduced on the 991.2 GT3? It's not like Porsche to fix things that aren't broken IMO. If the IAT cooling system exists, I think it's a mistake and an unnecessary complication in the name of a 'Ring lap time and/or peak power figures. Both of which are strange for Porsche to care about all of a sudden. If the hood ducts are truly brake ducts and make it to the production car, I think it's strange and an unnecessary complication that could have been rectified with a proper backing plate and ducting from the already existing inlets.

GrantG

Guess we'll know in a few more weeks...

Nizer

Don't see what all the fuss is about. I trust the engineers added it for a reason. If you don't want to deal with adding water then the computer will likely just dial back the boost/power to offset - no harm, no foul.

mwar99

Those garage queens will have the water evaporate from the tank before they probably use it up between service intervals...

ipse dixit

This vignette underscores for me the distinction, oftentimes overlooked, of the difference between cost of purchase versus the cost of ownership.

The former is easy to quantify, and many time easy to justify. The latter? Not so much.

C.J. Ichiban

Underivable, and lip mode. Seems like an unintentional mooty-ist comment.

Fwiw I can't wait to take my P1 on track again but will do so with a stack of tires.

laranja

Mooty-ist...

LAMO

levd

Same old misfire - rockers wear issue?