2005 Boxster Gear Grind

[jmasferrer]

Originally Posted by Adam

Are you trying to shift quickly or are you waiting for a second or two like you should be?

The 1st to 2nd gear shift is quick since I'm trying to get up to 60 mph or 70 mph quick, but once I'm up there - with the rest of traffic - I'd like to accelerate at a more reasonable pace. 3rd offers too much power and 5th not enough. 4th is the perfect gear for decent highway acceleration. And my shift to 4th is in no way rushed or delayed. This is my 1st porsche. I have a 2000 3 series, manual transmission, no problem. I also had a 1991 accord manual transmission, no problem.


To answer racer's "Why" again is that 2nd gets you to highway cruising speeds. Of course if I wanted to keep going (100 mph +) I would go to 3rd.

[racer_d]

Do you double clutch going from 2-4? This might help as it would slow down the shift and prevent a gnashing of the gears.

In your example I understand why you do it. I have done it myself on occasion, without a grind, but with a slow deliberate shift. You need to give the synchros time to do there job. My feeble mind says that if you shifted to third, you would be fine, but given the placement of the gears, and the large difference between the rates that they are spinning (lets say the car is at 6500rpm in 2nd but drops to 3500 in 4th, IS part of the problem. 4th gear is spinning at a demonstrably lower rate, if you consider that 3rd gear would be at, say, 5000rpm. You need to allow time to let the transmission catch up.

In addition, since the car is "used", what specifically does your warranty say about transmission repair? Not what you "think" it says, but what it actually says.

[jmasferrer]

Originally Posted by racer_d

Do you double clutch going from 2-4? This might help as it would slow down the shift and prevent a gnashing of the gears.

In your example I understand why you do it. I have done it myself on occasion, without a grind, but with a slow deliberate shift. You need to give the synchros time to do there job. My feeble mind says that if you shifted to third, you would be fine, but given the placement of the gears, and the large difference between the rates that they are spinning (lets say the car is at 6500rpm in 2nd but drops to 3500 in 4th, IS part of the problem. 4th gear is spinning at a demonstrably lower rate, if you consider that 3rd gear would be at, say, 5000rpm. You need to allow time to let the transmission catch up.

With this logic a 2nd to 5th gear should grind even more, but it does not grind at all.