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

series 7 · 08-22-2005, 06:41 PM

Is it better to put in the 911 engine NA or to turbocharge the stock engine?

Brucelee · 08-23-2005, 06:22 AM

There are no turbos that I have seen for the stock Box engines. There are a few supercharger kits out there however. Mucho bucks!

Re: the 911 engine swap, a few have been done. Again, big big bucks.

Most folks here shy away from both avenues once the costs and other trade offs are tallied up.

The preferred routes seems to buy an S model and PERHAPS go the intake and exhaust route.

Not tons more HP but say in the 280 range at best.

I think above is an accurate summary.

WoBoxster · 08-23-2005, 07:47 AM

http://www.abauer.com/scripts/shopplus.cgi?DN=abauer.com&CARTID=%CArtid%25&ACTION=action&FILE=/boxster.htm
http://www.turboperformance.ws/Porsche/SCKits/BSC/Boxster.htm
This might be what you are looking for

Brucelee · 08-23-2005, 08:09 AM

Given the way that white Boxster was being driven, I give it about a week before the Boxer engine is scattered across the parking lot.

To my way of thinking, there is NO WAY that the stock Boxster drive train can withstand the jolt in power. Tell the truth, most of us are concerned about our engines holding up as they are, let alone with adding another 50-75 HP with a blower.

Just my two cents.

series 7 · 08-25-2005, 07:46 PM

I never heard of anyone having any concern with their transmission being able to hold the power.

clubhead · 08-25-2005, 11:51 PM

Quote:

Originally Posted by Brucelee

...To my way of thinking, there is NO WAY that the stock Boxster drive train can withstand the jolt in power. ..

I understand the torque convertor on the Boxster S Tip is the same as those on the 996. Hence, the ability to handle 30-50bhp increase without problems.

I was told of the same thing from TTP when exploring their engine upgrade kit.

I can't speak for the manual boxes though...

Brucelee · 08-26-2005, 05:50 AM

I am down at the local dealer service dept maybe three times a week. Unfortunately, I get to see all of the 986 and 996s with their drivetrains out and being repaired/replaced.

I think this gives me a biased view of how well these drivetrains stand up to abuse.

I know the computers on these models record RPMS, overshifts etc. If there is evidence of abuse, the warranty is in jeopardy.

I guess I am risk adverse!

To each his own.

series 7 · 08-26-2005, 09:15 AM

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

clubhead · 08-26-2005, 09:21 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, 09:49 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, 10:14 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, 10:41 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, 08:43 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, 08:30 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, 03:33 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.