It's swings and roundabouts tho, the eaton gives you psi at any rpm but it's trade off is less overall bhp due to heat. It's a good blower for daily driver cars as it's a positive displacement pump (air in compressed after the blower), so with the use of a bypass valve its cruising bhp losses are less then 1bhp.Quote:
Originally Posted by Stuart
The twin screw produces less heat but compresses it's air inside the unit itself - meaning as long as the blower is spinning it's eating up bhp. Best option for track day and drag cars.
The centrafugal is the least heat generating unit but won't make boost until it overcomes it's gearing setup. Recently peeps have been gearing them to produce boost low down in the rev range and run a wastegate to bleed off boost higher up which works... but makes the blower use more bhp to drive itself.
I think if money wasn't an issue a twin screw blower and a electro-magnetic clutch system would be the way to go, but in Baxter's case the Eaton works well, is the cheapest option and will give him a nice big slab of torque.
I used to think 'wow that LET with a GT30 turbo produces 450bhp isn't that cool', then you look at the power curve and it have a very spiky peak power because the turbo is so big. A supercharged LET running the same boost might only make 380bhp but its producing a high output for much more of the rpm range. This makes for a drivable car and IMO and faster car round a track.
I am using an Eaton for my LET (no turbo), yeah its a monster heat generator (no more than a turbo). But a nice FMIC and twin port Aquamist kit has got my back :thumb:
