i am new to the boxster forum . i have a 930 but my friend is thinking about a boxster s . Has anyone done any forced induction on this car and what was the outcome. He has a audi s4 now and is looking at replace it .

 

There are a few people who have supercharged Boxsters (nobody's done a turbo that I've heard). Most everyone who has supercharged a Boxster has run into problems, including holing a piston. About the only way to reliably supercharge a Boxster engine is to run very low boost, but then, what's the point? The better option is to install a new 911 engine into a Boxster. Read some of the posts on this Board - there are some people who have done it, and it seems more reliable than running boost.

 

Supercharging the 2.5 yields better results than the 2.7 or 3.2 but even those "better" results still result in blown motors, etc. No long term results for turbos yet, only a few of those around.

 

Interesting.
Over on the 928 board, success with supercharged 928's is growing. I have 3 friends with supercharged 928's running 8psi, 14psi and 24psi. Yea, a few problems here and there but so far they are running quite well. Check out the 928 board for info, lots of threads on the topic. I'm suprised the all new boxster engine doesn't take kindly to boost.
Do these kits run intercoolers? If not, there is the #1 problem.

 

The reason they don't take kindly to boost is apparently on the intake side of the engine where they can get starved for fuel, and the Vario-Ram cam profiles are hard to match to a s/c or so I hear. I think it is the complexity of the Boxster engine that makes it hard to S/C, not that the engine doesn't take kindly to boost, it just has to be boost applied in the right fashion with the right fuel/air mixture.

 

This is not the case. Keeping fuel up to a s/c'd boxster motor is easily acheived.

There are 2 major issues with s/c'ing a Boxster
1) the static compression ratio is too high [11.0:1] to run realistic boost levels
2) the lack of engine bay space does not allow for a supercharger [housing] large enough to supply realistic boost levels.

There are companies doing turbo installs and achieving decent boost and power levels.
They all install lower compression ratio pistons.



JBrown
A pic is worth a thousand words......
RED = 3.4 motor
BLUE = s/c'd 3.2
YELLOW = inake & exhaust on 3.2
GREEN = standard 3.2