The gearbox limits are torque not BHP dependant. How much will you be producing?
The stock 620Ti at 240Nm gives PG1 boxes a very hard time as it is on the edge of its rated figures, when they fail the shaft bearings, (which are plastic caged) collapse, ruining the oil seals, and lose the oil.
You can uprate them to metal caged items, which are much better. Maybe get a PG1 with the LSD in it too from a Ti etc?
No idea what the driveshafts and hubs will take, remember they are designed for a Metro, not a turbocharged sportscar. I seem to remember that the wheel bearings are on the limit in a standard F/TF too.
Don't torque to him about clutches.
Will keep an eye on this thread but I think I'm going to stick with the K series and go down the turbo route. Been thinking about ditching the 1.8 and sticking the VVC head on a 1.6 and turboing that with a higher RPM limit. No idea if it will work yet but the 1.6 is supposed to be more rev happy due to the 1.8 being a step too far with the rod angles so less likely to fail at higher RPMs.
I have well over a year to research that though so I may well be talking complete rubbish Plus I need to find out if the Emerald can handle the VVC and a turbo together
wasnt there a f/tf with a ford 2.0 zetec lump in it. Whats the standard BHP on an old focus RS, I imagine that engine tuned would give more torque than the vtec?
Although if you can get the mounts etc for a vtec lump it might be best to fit one of them. I think 300 bhp in a TF for everyday use is gonna be 'interesting'