13-04-2012, 02:10 PM
If you want revs your better with idi, the di engines ve drops off more sharply the idi above 3k rpm due to it relying on swirl generated by the shape of the ports which diminishes fast higher up the range, some of the vag men have really cleverly ported thier heads to achieve the big rpms so alot of it is in the head not diesel combustion. The idi doesnt have this 'problem' and has ram type port with seperate swirl chambers.
As for bigger turbos being 'undrivable' I dont buy this at all, with my big turbo fitted, then removed and the hotside hogged out the car was far more drivable at low rpm than with the k03!!! Wee had a straight d 306 at the time and with no boost at all below 2.5k and a longer gearbox the turbo car off boost still would have roasted the straight d, imo it was more 'drivable' than laggy as fook k03 (lag not threshold
the k03 engine bogged down and went slower if floored below 2 grand).
Of course 'drivability' is just an opinion/preference and doesnt actually exist, maybe if this idea was dropped manufacturers would make proper diesels again.
As for bigger turbos being 'undrivable' I dont buy this at all, with my big turbo fitted, then removed and the hotside hogged out the car was far more drivable at low rpm than with the k03!!! Wee had a straight d 306 at the time and with no boost at all below 2.5k and a longer gearbox the turbo car off boost still would have roasted the straight d, imo it was more 'drivable' than laggy as fook k03 (lag not threshold
the k03 engine bogged down and went slower if floored below 2 grand). Of course 'drivability' is just an opinion/preference and doesnt actually exist, maybe if this idea was dropped manufacturers would make proper diesels again.