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Of course, the GT3 gets the RS motor also (just electronically detuned by 20hp)
The Speedster may get a particle filter that makes final power fall somewhere between 500 (GT3) and 520 (RS), hence the More than 500hp language - but all the same motor...
GT3RS gets better breathing from the side intake to make a little bit more power. Speedsters won't have those side intakes.
I'm sceptical about the ram air being better at the sides (RS) than over top of car (GT3). They said it was less interrupted airflow or something but why should air be better on sides as to on top?! Sides are more affected by cornering, have wing mirrors, door handles, tyres etc!
I'm sceptical about the ram air being better at the sides (RS) than over top of car (GT3). They said it was less interrupted airflow or something but why should air be better on sides as to on top?! Sides are more affected by cornering, have wing mirrors, door handles, tyres etc!
Marketing fluff if you ask me.
I agree 100% with this..I have fitted high flow BMC air filters in my 991.2GT3 with a JCR bypass which results in close to RS power IMHO.
I'm sceptical about the ram air being better at the sides (RS) than over top of car (GT3). They said it was less interrupted airflow or something but why should air be better on sides as to on top?! Sides are more affected by cornering, have wing mirrors, door handles, tyres etc!
Marketing fluff if you ask me.
Air has mass, it doesn't changes direction easily without help, i.e. surfaces like wings and body panels.
The air flow on the side of the car is of higher velocity, it follows the side of the car, and when it hits the rear fenders it still want to go straight, that's where the air intake holes are.
The air at the base of the rear window is more staled so to speak. when air leaves the roof line it doesn't go straight down and hug the rear window, it stays off a little bit and majority of it get redirected by the rear wing. The scoops on top are needed to redirect enough air for the engine. One can see that effect from wind tunnel footage, the smoke lie hugs the roofline but does't drop immediately back dow not the rear window.
Maybe the real reason is the widebody fenders already had holes in
I actually never considered that, but makes perfect sense to economize on the number of parts variants for the wide-body rear quarter panels
I agree with Whoopsy that the side intakes probably promote a bit better inlet pressure, but I wonder whether the difference is enough to bother, if the holes weren’t already there...
Like Whoopsy said, behind the greenhouse there is a low pressure area cause of the air flow separation causing turbulent flow vs the side where the fenders holes are right in the flow. The only better place I can think of besides fender would be on the top of the roof ala GT1.
The wing on the GT3 would make it even worse cause of the low pressure area under the wing which should suck air away from the intakes.
Disclaimer - I got my aero degree from youtube, so caveat lector.
I actually never considered that, but makes perfect sense to economize on the number of parts variants for the wide-body rear quarter panels
I agree with Whoopsy that the side intakes probably promote a bit better inlet pressure, but I wonder whether the difference is enough to bother, if the holes weren’t already there...
They actually have 3 different fenders widths. Turbo cars has he widest and C2 has the narrowest. GT3, 911R, share the S fenders.
Now consider this, those IPD plenums are smoother and flows better than stock ones, if a part that small already have an effect on HP, those holes on the side certainly helps, even at lower speed.
They actually have 3 different fenders widths. Turbo cars has he widest and C2 has the narrowest. GT3, 911R, share the S fenders.
Now consider this, those IPD plenums are smoother and flows better than stock ones, if a part that small already have an effect on HP, those holes on the side certainly helps, even at lower speed.
S and C2 have the same fenders. GT3, 911R, C4, C4S, and GTS share the same middle width fender.
02-13-2019, 01:33 PM
