Right, I've finally had a good road test of my Brera since the exhaust was replaced and ECU remapped. Exhaust was replaced with stainless steel from the flexi pipe back - all three giant super heavy silencers removed and replaced with 4 straight through lightweight boxes, saving around 15kgs. Remap eliminated the factory-programmed overfueling.
Together, we gained 20 bhp peak and 34 NM torque at the flywheel, with 95% torque from 2100 revs, and an almost total removal of the hesitation issue - there is a slight drop in torque around 2300 revs which can cause a slight lack of smoothness if you catch it just wrong, but this is light and dissapears when properly warm or running on super unleaded.
Well I already knew that in town these changes had made a huge difference - hesitation almost entirely gone and more torque, with torque starting lower down, so really perky in town like hot hatch.
Now out on the motorway how is she doing? AWESOME. Smooth and fast with excellent throttle response, just a millimetre extra on the accelerator and she responds even in 6th gear. She accelerates much easier at motorway speeds and the fuel efficiency is through the roof. I believe this is not just the remap, but also because the hugely restrictive chambered boxes have been removed. It used to be that the car could run at fast
motorway speeds, but the mpgs fell through the floor. I think this was the engine struggling to push the gasses out of the exhaust. That problem is gone. If pushed hard on the motorway, the mpgs would fall to 21-23 average. Today, driving spiritedly wherever possible, she averaged 27 mpgs. The tank would normally last 280 miles out of town, 300 at a push. Today out of town: 350 until the first flash of the orange light, 370 before we stopped!!! The throttle response and acceleration at high speed are up as well.
Result: the car now has town performance that feels more like a hot hatch thanks to more torque from lower revs, and cruises and accelerates faster on the open road than the GTV 2.0TS 16v, which was so happy around the 95-105 mph mark - and all with an increase of 2mpgs in town and 4 mpgs in spirited out of town driving!
If the 2.2 was like this out of the factory, the competition would seriously be in the sh*t!
I can't recommend to 2.2 owners enough the benefits of getting rid of those shocking stock silencers (it does get louder though), and Red Dot have done a lovely job of the remap after a couple of false starts