What John is trying to say is that I offered (near as dammit insisted) on him taking my delightful compact green umbrella, but being the Gok Wan of the Coupe world, he decided that it would clash with his "down wiv tha kids" fashion sense. Plus, having just fertilised his shiny patch, he did note that a little extra rain may help it grow back quicker.
So to John's car, well it is a considerable handful in the wet, especially with the current track focused suspension settings. That said, it does put the power down very well as the ramp rate is smooth and linear, which is perfect for a very powerful front wheel drive car. There were a couple of issues on the day:
1. A misfire above 1.5bar was down to plug gapping, so this was corrected from 0.8 to 0.7mm.
2. Fuel starvation at high rpms when running 1.5bar+. The fuel pressure was increased (injectors now flow 710cc per cylinder), but the in tank Walbro 255 pump is starting to struggle thus pressure dropping at the rail. These pumps really are on the edge at this level, so an inline pump is now required.
The boost drop off is something else though (not fuel John!). It is likely we have reached a restriction with gas flow, as the new compressor has no issues flowing the required air at this level. If the boost held another 500rpm the power would keep climbing and sail past the 500 mark.
The track setting is 1.3bar, this was good for 440bhp without breaking a sweat, so should make for a very good time at Donington.
Tuning is a tough game at this level, it's big ask to get 500bhp out of a 2 litre engine that still has perfect road manners, driveability and of course reliability. But you know what, 2012 will be the year of the 500bhp Coupe.