911 engine worth it - 986 Forum - The Community for Porsche Boxster & Cayman Owners

series 7 · 08-26-2005, 10:15 AM

well, does anyone know how well the manual boxster gearbox would hold up to performance upgrades?

clubhead · 08-26-2005, 10:21 AM

Quote:

Originally Posted by series 7

well, does anyone know how well the manual boxster gearbox would hold up to performance upgrades?

I don't know for sure but I would assume any manual gearboxes would have a fair amount over engineering in them. It's the clutch that'll normally be the first to go if the power is too much to handle. Meaning it'll start slipping sooner during hard driving or launches.

If the clutch is upgraded with a stronger pressure plate and clutch plate, the problem should go away. The gears and synchromesh themselves seldom gives way unless you put like additional 100bhp on and launch the car brutally

I've only seen that on Subarus WRXs which are famous for weak gearboxes.

KRZTACO · 08-26-2005, 10:49 AM

I thought the 911 6 speed tranny was dropped into the 986 S models for use? Is that the case or not?

If so, the tranny is MORE than upto the challenge.

KRZ

clubhead · 08-26-2005, 11:14 AM

Quote:

Originally Posted by KRZTACO

I thought the 911 6 speed tranny was dropped into the 986 S models for use? Is that the case or not?

If so, the tranny is MORE than upto the challenge.

KRZ

Not for the manual from what I know.... Only the Tip.

KRZTACO · 08-26-2005, 11:41 AM

Where's TOOLPANTS when you need him???

I could have swarn that the 911 6-speed is used in the 986 S

KRZ

Adam · 08-26-2005, 09:43 PM

It is the same gear-box/shifter in the S and Carerra. They even have the same gear ratios. I imagine it could handle loads more power without a whimper. The clutch is beefier in the 911 however but I would bet it could handle 300+hp for quite awhile if common sense was used.

TOM986 · 08-27-2005, 09:30 AM

I don't think so. I have read that the 911 trns is at the other end of the engine and has to turn the opposite direction from the Boxster. I'm not positive of that though

Adam · 08-27-2005, 04:33 PM

It is at the other side of the engine. It is behind in box and ahead of the engine in the 911. It is essentially the same tranny though just placed in a different spot and maybe reversed.