I had a 306 DTurbo (1.9) and that was nice, had a great pull too, but the biggest issue was the rev range, limiter cuts in at 4.5k and the turbo comes on about 2.5k and those 2k revs really fly in all gears.
I dont know how fast the 1.4rt is but the 306 was great (for a group 4 car!)