turbo or supercharge ?

I looked into supercharging my 2.5 tiptronic boxster last year as it was not recommended to me to use a turbo(we didn't think that the tiptronic would take it)
the other option to get more mph was changing exhaust and chipping the ECU.
having sold the 2.5 and bought an S instead did any of you upgraded your S to get more speed and for what price and which system?

[nastyboxster]

I upgraded from a 2.7 to an S a few months back and is very happy with it. Upgrades were the B&M shifter and the Evo air intake.

The shifter made the car feel sportier and would not go back to a regular shifter.

I just put in the Evo air intake and it is sweet! It suppose to add only about 10hp, but it feels much faster than that (maybe it's the sound). Also, the sound from the intake is incredible. I haven't turned my stereo on for the past few days just to enjoy the sound of the engine.

I'm looking into the 2nd cat bypass right now. As in my previous post, I''m going to a custom muffler shop to see if they can custom make the bypass pipe instead of paying $500 retail.

To get an extra 35hp, you will have to spend retail about $3500US. - ECU, 2nd cat bypass, air intake and muffler.

hi there do you find the short shifter stiff in second gear? it is a thread somewhere else on the forum and many people find the original gear change stiff when cold and the shorter shifter even stiffer

[nastyboxster]

It is a little stiff when it's cold, but you get use to it. I wouldn't have notice if you didn't mention it.

Great on track days, specially downshifting to 2nd before a turn.

I would do the Evo first if you want to be yelling HOOORAY on 3rd gear at 100mph.

[deliriousga]

Between turbo and supercharger, I'd go with supercharger.

First, it's more efficient and quicker. The turbo has to have a certain exhaust flow before it really kicks in and loses some power since it restricts the exhaust a little. The supercharger winds up faster since it's belt driven and does not restrict the exhaust at all.

Second, the supercharger takes up less room. The turbo is harder to fit and takes more effort to install.

The plus for the turbo is when it winds up, it sounds cooler.

[MNBoxster]

Originally Posted by deliriousga

Between turbo and supercharger, I'd go with supercharger.

First, it's more efficient and quicker. The turbo has to have a certain exhaust flow before it really kicks in and loses some power since it restricts the exhaust a little. The supercharger winds up faster since it's belt driven and does not restrict the exhaust at all.

Second, the supercharger takes up less room. The turbo is harder to fit and takes more effort to install.

The plus for the turbo is when it winds up, it sounds cooler.

John,

A couple points, Supers are not more efficient than a Turbo. It's efficiency drops off rather quickly. Another disadvantage to the Super is the Parasitic Loss since it draws Crank HP. In the case of the Jag XK8, at full spool up the Supercharger is drawing 86 Crank HP , there's still a considerable 100 HP Net gain though and the Super has little Lag.

The Turbo is essentially Free because it's Recovered Energy, and unlike the Super, (which can only spin as fast as the Crank, or some close derivative), the more power a Turbo makes, the more power it can make. Turbines are much more efficient than a set of vaned rotors and so don't peak nearly as soon. Turbos do Lag, some more than others, but once they get going they come on strong.

Most people do not realize the Nature of Forced Cars. They are Schizophrenic, that is they have a Split Personality - one On-Boost and one Off-Boost. This can make them less enjoyable to drive than an NA Car because unless you're very good, the Boost can Come and Go at some fairly inconvenient times, especially on the Track, such as on the Apex and such where they can upset the Car's Balance and Line.

I love the Turbo in my Esprit, but I equally enjoy the fact that the Boxster is NA - the power delivery is much smoother and it's less of a handful to drive. As always, just my humble $0.02...

Happy Motoring!... Jim'99