POST 1Original post
Anyone have the gear ratios and final drive for the PDK gearbox? Yes I've searched Planet Porsche and FAQ and Google, no luck.
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YOUR RESEARCHPDK ratios
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POST 2Original post
I thought I saw them as part of the technical specs somewhere along the line on the Porsche Web site. Although that might have been for the 911s . Might be worth a look around there.
POST 3Original post
I have googled and otherwise searched extensively for the PDK gear ratios without success. Tried all Porsche models. Have not been able to find the 6-spd gear ratios for the Cayman Gen2 models either. Presumably the Gen2 owner’s manual will have the data, but mine is a Gen1 model.
POST 4Original post
Car June 2009 PDK Boxster 1 3.91 2 2.29 3 1.65 4 1.30 5 1.08 6 0.88 7 0.62 FD 3.72 R 3.56 Carrera S have same ratios but FD of 3.44 (Jan 09) There are PDF roadtest you can download from their website Carmagazine.co.za
POST 5Original post
I've searched and found two other final drives, 3.25 and 2.62. Yours makes three. 2.62 has to be wrong. I wish I knew which one to believe.
POST 6Original post
Could their be more than one FD ? ie there are 2 gearboxes and 2 clutches
POST 7Original post
I Googled "final drive ratios PDK " again and came to the following conclusion: the 1-7 PDK ratios for the 987 and 997 is similar but the final drive (ratio) has been reduced (to make the 987 accelerate slower) from 3.44 to 3.25 for the 987S. The 987 non S however has a higher final drive ratio of 3.62 (to increase acceleration). This would explain why the 3.8 PDK feels so much stronger than the 3.4 PDK and why the 2.9 PDK feels so similar to the 3.4 PDK Here are the ratios from Top Speed for the 987.2S Manual Pdk 1St 3.67 3.91 2Nd 2.05 2.29 3Rd 1.41 1.65 4Th 1.13 1.30 5Th 0.97 1.08 6Th 0.84 0.88 7Th – 0.62 Reverse 3.33 3.55 Final Drive Ratio: 3.88 3.25
POST 8Original post
Actually a 3.44 FD ratio is LOWER than a 3.25 ratio. The way to keep higher and lower straight, since the concept is backwards from the numerical values, is to think of top speed. Generally , top speed will be higher with a 3.25 than with a 3.44, so the 3.25 is a higher ratio. Another way I think of it is that the 3.25 ratio is 'taller'.
POST 9Original post
the ratio is lower but the final drive is higher ie weaker gear ie slower acceleration with higher top speed (987 S PDK v 997S PDK ) the ratio is higher but the final drive is lower ie stronger gears with better acceleration but lower top speed ( 987 PDK v 987S PDK ) Here are the gear ratios from the 987.1 Manual (source FAQ) GEAR RATIO MAX SPEED (@ 7,000 RPM) 1 3.31 42 mph 2 1.95 72 mph 3 1.41 100 mph 4 1.13 125 mph 5 .97 145 mph 6 .82 171 mph If the Top Speed ratios for the 987.2 Manual is correct, then the weaker 1st and 2nd gears of the 987.1 has been addressed in the 987.2 but the PDK S has been held back with a weaker final drive
POST 10Original post
From official 2011 Porsche Press Release PDF file at http://press.porsche.com/vehicles/11_press_kits/pdf/2011_Cayman_Specifications.pdf :: Manual PDK . . . . Manual PDK 2.9 Cayman . . . . Cayman S Gear Ratios 1 3.667 3.909 . .. 3.308 3.909 2 2.050 2.292 . . .1.950 2.292 3 1.407 1.654 . .. 1.407 1.654 4 1.133 1.303 . . . 1.133 1.303 5 0.972 1.081 .. ..0.950 1.081 6 0.841 0.881 . . .0.081 0.881 7 .. - ....0.617 .- ...0.617 R 3.333 3.545...... 3.000 3.545 Final Drive 3.875 3.250 ........ 3.889 3.250 Drag Coefficient 0.29 0.29 ..............0.29 0.30 Compression Ratio: 11.5 to 1.............. 12.5 to 1 Wheelbase Length 172.3" all Width 70.9" Height 51.3" 51.4" Luggage Capacity 9.9 CU FT (280 LITERS) Cargo Volume 14.5 CU FT (? liters) Fuel Tank Capacity 16.9 gal / 64 liters Curb Weight (lbs) Manual PDK.......... Manual PDK 2.9L Cayman . . . . 3.4L Cayman S 2932 2998 ..........2976 3031 Fuel economy city/hwy [mpg] 19/27 20/29..........19/26 20/29 Top Track Speed 165 163 . . . . . . . 172 171 Acceleration 0-60 mph (0-96 km/h) 5.5 5.4................. 4.9 4.8 But, same PDF file also states: Engine Concept Power unit Specifications Cayman vs Cayman S 3.5 in. 3.8 in. 3.1 in. 3.1 in. 2893 (2.9l)....... 3436 (3.4l) 12-volt, 2100-watt alternator, 60Ah battery Models Engine Concept: Horizontally opposed, mid-mounted six-cylinder Construction: cylinder and engine heads formed in aluminum Valvetrain: Four overhead camshafts, four valves per cylinder, variable intake valve timing and lift control (VarioCam Plus), hydraulic valve play compensation Intake System: Direct Fuel Injection (DFI) Lubrication: Integrated dry-sump Management: Motronic® with six coils, sequential multipoint fuel injection Gas/Fuel: Premium Unleaded Bore: 3.5" 3.8" Stroke: 3.1" 3.1" Displacement 2893 (2.9L) 3436 (3.4L) Max BHP 265 @ 7.200 320 @ 7200 Max Torque 221 @ 4400-6000 273 @ 4750 3436 (3.4l) Compression 11.5:1 ..... 12.5:1 265 @ 7200 320 @ 7200 221 @ 4400-6000 273 @ 4750 Engine and transmission bolted together to form common drive unit, engine power transmitted via driveshafts
POST 11Original post
I’m wondering if we could swap the lower final drive ratio with the higher one on the PDK to get even sharper acceleration?
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