http://jalopnik.com/241811/geneva-showcase-lotus-exige-gt3
From Wikipedia:
Engine
Toyota supplied 2ZZ-GE, 1796 cc I-4, DOHC with VVTL-i and Lotus T4e engine management system, Roots-type Eaton M62 supercharger and intercooled
Bore/Stroke 82.0 mm / 85.0 mm
271 bhp (202 kW; 275 PS) @ 8000 rpm[6]
190 lb·ft (258 N·m) @ 7000 rpm[6]
Compression Ratio: 11.5:1
Exige GT3 performance
0-60 mph : 3.9 seconds[6]
0-100 km/h : 4.0 seconds[6]
0-100 mph (0-160 km/h) : 9.8 seconds[6]
Top Speed : 160 mph (260 km/h) - electronically limited[6]
Power to weight ratio : 361 bhp (269 kW; 366 PS) per tonne
271 HP! NICE, even boosted with that high compression ratio, wow
(http://cache-02.gawkerassets.com/assets/images/gallery/12/2007/03/medium_412442830_92ad85715e_o.jpg)
(http://cache-02.gawkerassets.com/assets/images/gallery/12/2007/03/medium_412443453_74cd5cee35_o.jpg)
11.5-1 comp ratio? You read that right? What does the supercharger do? Reduce the manifold pressure? 11.5-1, with what boost?
Yeah, it seems strange to be boosting on atop of 11.5:1. Why don't they drop the compression to like 9.5:1 and then run 20+ PSI boost?
The Mazda runs a 9.5 compression with a max boost of 18psi! Boosts to 15.7 in 3,4,5 and 6, limits to something like 12 lbs in 1 and 2. May be possible to boost 11.5 comp with a lot of tuning magic.
I guess Toyota isn't interested in making a special low-compression-tailored 2ZZ for Lotus, so it would be up to Lotus to swap out pistons, which would be a lot of work and would void any Toyota warranties for sure....