ExMB

Please reread Whoopsy's post. IMHO he said what he could say and explained why in his post. That is very open and is more than you get from other sources.

ExMB

Yes and no. Porsche can change the gearing if they want to. The question will be if it will appease the trackrat or the autobahn driver. And who is to say that they couldn't change the final drive to go along with a gearing change to stay within boundaries. We all know that PAG is good at getting into someone's wallet as well as positioning within a hierachy.

GrantG

I am not aware of any instance in recent history (or ever with GT cars) where Porsche geared a sports car, so that Vmax was significantly lower than its theoretical maximum. And they are very careful to engineer the gearing spread for good high speed acceleration (i.e. they would never pack gears 1st through 5th closely and then tack on 6th gear for Vmax).

In that context, there is very little room for creative modification of the GT4 gearing without some increase to redline beyond 8k.

blackholescion

It's definitely interesting to think what they set red line to. 8k should be easy with aluminum (assuming) rods. BMW did it in their S54 and post 2003 (when they fixed the bearings) didn't have any issues.

However, going off of a GT3 dyno, 8k might make too much power without additional restrictions. If they are restricting anyway, they could rev it past 8k (8200ish?) and market it heavily. Even keeping the existing red line of 7600, it's going to make more than 450 if they left everything alone on the inside/intake/heads/etc. At that point, the GT3 is making ~440 at the wheels. Maybe if you consider some additional drivetrain loss from being mid engined but that would mean it would put down ~420. there's no way porsche markets it at 450 with those kinds of numbers at the wheels, IMO. They could gimp it with a tune. I hope they do set the red line above 8 and gimp it in other ways like they did the existing one. That motor deserves to sing.

https://rennlist.com/forums/991-gt3-...pd-manual.html

CAlexio

he does. one of the few.

Yargk

This. They are geared to work on track, even if the track has straights like the nurburgring. Honestly, I like it this way because the gear to gear spacing is always consistent, even if a bit wide. On the GT4 I don't think much performance on track is gained at all with shorter gears, it would just feel more punchy.

Five12Free

Nimche

I have a 718 Boxster S and I wish it sounded like this. It sounds more like 991.2 S

Whoopsy

Don't look any farther than the current GT4. In manual or the PDK version as in the GT4CS. 2nd gear can be quite a bit shorter if I were in charge. Some corners I really would want to take in 2nd gear but I have to be in 1st gear simply because if gearing.

35Mugen

So this is how Porsche is going to amortize the cost of the GT3 4.0L NA H6... 911 Speedster anyone? Perhaps it too will be detuned to the same extent of the 718 GT4 to preserve the hierarchy.

https://www.carscoops.com/2018/04/po...st-hurrah-991/

Whoopsy

Only at times when they don't change their mind from the tine I talked to people and the time they actually release the cars.

I will know more about the GT4 next month when I am actually inside Weissach facility. Actually my focus will be on the race car version but.

But baring any surprises, I am quite sure of what I had posted already. anyways as a 'racer' for them now, I get to access a different set of people.

GrantG

I agree and I wish the gearing would have been both lower overall and closer spaced ratios in the GT4. But with gearing, you can't have your cake and eat it too - it's all about compromise. If you shorten 2nd gear, then you have to shorten the rest of the gears or increase the spacing among them (already too wide, imo).

But...If I made a custom gear set for myself (for mostly local track use), the top speed would end up being about 30mph slower than how Porsche geared it (and ratios much closer together). Porsche wouldn't do that, because they wanted that car to go 183 mph (and it was nice to have that capability on the Autobahn and Nordschleife when I was there). But in Denver, 153 mph is more than enough (including local track). By spacing the gears more closely, the car would really rip! But, then the car would also be pretty buzzy on the highway and get worse fuel mileage.

I would like to think the perfect answer would be to offer standard gearing and an optional "Sport" gearing (if Sport includes Nurburgring runs where the redline in 6th gear is your limiting factor). But that would never work - since Porsche is already struggling with emissions and consumption issues with its NA motors and lower gearing would make matters worse.

Maybe Porsche will surprise us and make the redline at least 8,500 rpm which will give them the room to make the gearing a bit better. Then they'll have to be creative in how they bleed off >75hp (since the GT3 RS makes 520 hp at lower revs than this).

Whoopsy

You do realize Porsche have had every single engine they made fitted to the Cayman/Boxster body to try out. All the way from the turbo 4 to turbo 6 to NA 6. Any video is useless if there is no date included. They even had the GT2RS engine inside a mule, but that version is definitely NOT going into production,

VLJ

This is interesting if true. Makes perfect sense, actually.

ExMB

Congrats