CarAholic

Love My S, even more fun to street drive then the GT4

Jimmy-D

[QUOTE=A432;13824360]The rumor on the GM insider street right now is a detuned GT3 3.8.
Partially because the 991S 3.8 is no longer being produced and because the turbo engines still go against the GT3/4 philosophy internally.


I can only see this happening if the 991.2 GT3 stays with a 3.8 L but I am betting it will move to a 4.0 L. But, how much work is needed to drop displacement from a 4.0 to a 3.8 on say the same engine sort to speak if that makes any sense??

GrantG

Only major differences are crankshaft and conrods, afaik (both of which are already developed for 991.1 GT3).

A432

Yup, it's essentially the same engine and takes advantage of some economy of scale and certification.

The thought process goes it's not worth it to continue to produce a very different 9A1 (991S 3.8) for the limited numbers of the GT4,

with the 991S 3.8 gone, 3.8 GT3 detuned makes more sense. Running diff. crank and rods is a simple parts bin diff. on the assembly cart.

Jimmy-D

^ I like this.

I hope the GT3 moves to 495 HP and they put a 8000 rpm faster revving 3.8 with at least 435 HP in the next GT4 iteration. Would be pretty awesome but still not in love with the new rear on the 718. I need to look at it more

A432

We're all just guessing at this point but imho the 495/435 hp is in the ballpark, maybe 495/415 because Porsche tends to maintain heirarchy ie. 420 hp. 911S,

just that the GT4 redline would probably be greater than 8000 rpm, too much work in those GT3 heads and flow to limit it at 8K.

khooni

This is silly. The price point will not be fitting with a Cayman.

At least a mega hp turbo 4 will lift ordinary caymans.

This is a beautiful dream.....

ajw45

Wouldn't a detuned GT3 3.8 = X51 3.8?

If the GT3 engine was "detuned" to save on cost (no fancy crank and heads) to run under 8k rpm, aren't we essentially back to the 911s 3.8?

mooty

most manufacture can do high rev in hyper car
what i want is an inexpensive car like s2000 that goes 9k
i have beat the lucky day light out
of
that engine never missed a beat

orthojoe

No. GT3 engine is almost a totally different animal. The question I have is whether or not the oil dry sump tank from the gt3 engine would fit in a cayman

GrantG

My personal guess is turbo 4, but I don't think the oil tank would be a reason to forego the GT3-style motor. I think it could be relocated almost anywhere in the car (including the front trunk area like early 911 race cars).

orthojoe

Nice. One can still hope. A 450hp 3.8L detuned gt3 engine would be the stuff of dreams

sunnyr

I think they would be subverting the whole 718 "4 cylinder turbo" is awesome message if the next GT4 goes back to a 6 cyl NA.

ajw45

Sorry, I didn't mean that literally, I understand the GT3 engine is very different but it's also more than twice the cost of a standard 3.8. If you start with the GT3 engine, detune it for less power, and also do some cost cutting to make it fit a GT4 price point what kind of powerplant are you left with? I would guess that detuning and cost cutting would drop the redline to 8k rpm, drop the finger follower design, cheaper crank, no dry sump, etc. at which point we might be left with something architecturally different but functionally similar to the X51 3.8.

MayorAdamWest

This is going to be a curious car. I would have guessed a turbo 4, because why spend all this time trying to convince non-GT buyers that the turbo cars are great, and then ignore them in your flagship cars for each model? (Like sunnyr says).

There is also another bit of data that I'm curious about. The existing GT4 isn't that much more money than a well configured 718S or 981GTS. If you put a detuned GT3 motor in it, is it really in the same price class anymore? My favorite thing about the GT4 is that it's affordable by Porsche standards. I really hope they can keep it under 100k, but I don't think that'll be the case if it has a NA 3.8L.

All that said, my hope is for a Turbo-4 PDK GT4 that can be acquired for ~100k. I'd buy 3.