so i have a 2010 gt3 and curious about redline.

Redline on the dash indicates appx 8200 rpm...but i have read on internet/mags that its 8250, 8400, and 8500.

whats the deal?

 

states 8500
2010 Porsche 911 GT3 - First Drive Review - Auto Reviews - Car and Driver

states 8250
2010 Porsche 911 GT3 - First Test - Motor Trend
states 8400
2010 Porsche 911 GT3 - Road Test - Auto Reviews - Car and Driver

8500
2010 Porsche 911 GT3 - Porsche Sport Coupe First Drive Review - Automobile Magazine

 

Good Q.. I'd do what the tach says.

 

my mistake..was counting each mark a 100rpm instead of 200. retarded. Finally found this:

Engine data
Type M 97/77
Horizontally opposed engine,
liquid cooled
Number of cylinders 6
Bore 4.04 in./102.7 mm
Stroke 3.01 in./76.4 mm
Cubic capacity 231.6 cu. in./3797 cm3
Net-horsepower 435 hp/320 kW
at crankshaft speed 7600 rpm
Net torque 317 ft. lb./430 Nm
at crankshaft speed 6250 rpm
Engine oil consumption up to 1.5 liters/1000 km
(1.6 quarts/622 miles)
Maximum permitted engine speed 8500 rpm
Engine control Stationary high-voltage distribution, sequential injection,
cylinder-selective knock-control, stereo oxygen sensor closed-loop control, diagnostic system,
4 overhead camshafts, Porsche VarioCam, hydraulic valve clearance compensation

 

Yep thats right. 8500 is what the technical data sheet from Porsche says.
8400 is from the 997.1