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I was chatting to an owner of a tuned 964RS and asked about the supercharger conversions - he said he knows people that have gone down that route and then taken them off, as it robs the engine of character... not just noise wise, but all the grunt is low down not high up the rev range. Horses for courses, but he recommended tuning up the engine more traditionally - inlet, exhaust and engine management, before getting onto cams, porting etc. Domster

It will only add power, not take it away. If it adds more power low down but none extra higher up, that's fine. The more the merrier. the new belt driven systems are silent, unlike the old noisey gear driven versions. >> Edited by Roadrunner on Friday 14th June 16:47

Thinking about it your friends claims are wrong. A supercharger creates more power at higher revs than lower revs. A belt connects the engine and supercharger directly. The more you press the loud pedal, the higher the engine revs, the more the blower spins, more power is generated. >> Edited by Roadrunner on Friday 14th June 19:55

That's what I always thought - since it's driven off the crankshaft (??) it's input varies linearly with engine rpm, so it shouldn't really change the engines character too much, just 'shift' the power/torque up a bit all over?

As I understand it the supercharge should rob a little of the power lower down and improve it later, as its driven off the camshaft. No turbo lag at least.

You could also argue the air conditioning drains engine power, due to the extra friction of the belt driven compressor, but you would'nt be able to tell on the road. A supercharger is the same principle. Even if you could detect a drop of 1 bhp on the road, it would be overshadowed by the extra 100 bhp soon enough. I don't want someone messing about with the internals of my brand new engine. I prefer the simple bolt on approach to tuning: exhaust, headers, cat by-pass, muffler by-pass, supercharger, race filter. If I sell the car it can be returned to standard spec quickly if required.

Probably of no interest, but I've heard back from one 'charger place: We are currently in development on the supercharger for the 3.4L and 3.6L 996 cars. We are shooting for a price of about $10K installed and will be building cars towards the end of the summer. Call or e-mail me if you have any additional question. Evolution Motorsports Phone: [phone removed] Fax: [phone removed] www.EvoMS.com

Aside from the target weight of 1200kg and the Fabspeed Motorsport 380bhp upgrade, I'm toying with the idea of a supercharger. Kits for most cars seem to come in at 5k for a circa 100bhp gain. Conversions I've seen before often use the aircon mounting points in the engine bay, so it might get too warm in the summer. There seems to be two main types of device. The more traditional versions use heavy gears and involve oil cooled plumbing. The new systems are lighter, run cold, don't require any maintainence and just use a fan and belt arrangement. These seem ideal: www.z-engineering.com Any thoughts, experiences or recommendations for other companies etc...? >>> Edited by Roadrunner on Monday 17th June 01:04