GazC2

Any idea what this is all about ? force cold air into the induction system

http://www.design911.co.uk/fu/prod12...uction-system/

NineMeister

Yes, it's a brilliant addition to the 911.

Connect it to the heater feed pipe and it will keep you nice and toasty warm in those Scottish winters.

Porsche964FP

GazC2

I thought that would be the response I will put it next to the chocolate fireguard

JasonAndreas

There are the Borg-Warner 24volt electric superchargers that actually work. Just need to beef up the wiring harness a little bit...

FeralComprehension

The fuse rating is 5A, so the peak consumption of that motor is 60W, or roughly .08 hp...

In my current position I sometimes do engine testing, and it was my good fortune to oversee the SAEJ1349 testing of the supercharged motor Roush built and tuned for the Shelby 500 Mustang. They were looking for (wait for it...) about 500hp for marketing purposes.

Part of this test is to use the dyno to spin the motor with the fuel and spark turned off and the throttle held open. This serves to measure the internal power consumption of the motor- friction, pumping losses, and in this case the required input power to the blower.

You already know how much power the engine made. Want to guess at how much power it took to spin the entire reciprocating assembly (including the blower) at the peak power RPM?

~250 hp. (my immediate response was "Are you fekking kidding me?!")

I'm thinking .08 hp ain't gonna get you much airflow....

GazC2

"instant performance increase" to be fair it doesn`t say how much

Babalouie

Also...5A means that redirecting the engine bay heater blower to point into the airbox would be 6x more effective than this device

(but I guess six times zero is still zero...)

Steam Driver

As someone who used to deal in superchargers I can unequivocally say this won't work. Supercharging (mechanical) takes a lot of power, a lot more than a Porsche's electrical system can provide. There's no free lunch.

fuch

So in other words its a fecking lump of useless crap.....

Interesting stuff on the dyno testing....

mikey_audiogeek

A general rule of thumb: Superchargers add about 3x as much power as it takes to drive them. So if you want 100hp, the supercharger will take 30-35hp to drive.

Or: if your 12V/5A supercharger takes 60W to drive, it will add about 180W (= 0.25hp)

Cheers,
Mike

FeralComprehension

Woohoo!

meek

What I can't credit is a 'Porsche Specialist' selling this kind of toot. Or, maybe I can.

Porsche964FP

+964.

Robbie Ravioli

I know a thing or two about this. I used to work for Jaguar cars in their engine development department and know the XKR engine very well.

At full chat, it takes just over 100 bhp to drive he roots blower. The NA version produces 300 bhp, the SC 400 -> blower gives you 200 bhp extra -100 bhp drive loss. The comparison is very rough, whle due to various lmitations in max cyl pressure, exhaust gas temp limits as well as max boost pressures, the blower efficiency cannot be accuratly estimated this way.

In order to produce a mechanical energy of 100bhp, you need a chemical energy from the fuel of approx 300bhp, as a thirh is lost as heat in the cooling system, one thirth is lost as exhaust heat the last thirth is effective mechanical energy. From this hirth you than need to drive the alternator to provide the electrical power for your E-SC, which has an efficiency of max 85%. and all of a suddenly you have invented the perpetuum mobile! The math simply doesnt work, neither does the E-SC, aart from helping someones back account.

The other problem is that you need to completly remap the engine management system. The boost requires very different ignition settings, as well as fuelling. That is apart from the limitations in bearings, conrods, piston rating, valve temps, cylinder head temps, exhaust port temps as well as the full drive line. And hat is asuming that the block will withstand the additional cylinder pressures and the topology (oil and water low/air low) can cope with it all. Any serious tuner will (not those chip tuners) will tell you the same!