GrantG

Don't know the answers, but the fact that they drastically reduced the stiffness of the valve springs and the friction with the cams should help that interface (whatever the material).

Loess

I am really curious to see the top end of this engine and the finger followers or whatever they are using. With a high rpm engine I'm sure they were afraid of valve float so they increased the valve spring rate which put too much pressure on the follower. I guess better to have some worn followers than bent valves.

I'm not sure how they have addressed potential valve float while reducing the force on the follower?

GrantG

I think getting rid of the hydraulic lifters (and their more elastic/bouncy nature) allowed for more precise positioning of the valves with less pressure.

boyko23

SA Supertest - 7.18 min:

Gravs

***** of steel. And to think someone went 6s faster?

bccars

BOOM, this is the one I was waiting for. So what do we have ? CG does a 7:24 in the GTS and a 7:18 in the .2 GT3
Performance difference with the same driver in the car is 6 seconds. GTS was not on semislicks. Oh boy, that GTS is good !
Still glad I'm getting the GT3 though.

lume76

Actually the GTS ran on Pirelli P Zero Corsa N0, so tyres were comparable... Still quite a result for the GTS.

bccars

Ah, ok, but still...
Again an illustration of how difficult it will be to sustain a NA GT line in the future ?! Competition is growing ...
The GT3 still has the heritage, the passion, the raise your arm hairs x factor. It's in a niche of its own. But there's no denying cold hard performance !

GrantG

These days cold hard performance is a commodity easily found. Something exciting and emotional to drive is a rarity...

DK7

right!!
which car is exciting and emotional in your opinion?

GrantG

Manual GT3 on order

kingjr9000

extra

TopspeedPT

Porsche 991.2 GT3(Cup 2): 7:18.2
Ferrari 488 GTB(Cup 2): 7:21.63(+3.43)

GrantG

Amazing that Porsche achieves that with 160 hp and 221 ft-lbs less power and torque! I guess mid-engine isn't always faster than rear-engine...

Palting

Anyone notice that the seat was neither the standard seat nor the buckets?