30-60mph in 3rd times??

[cwspellowe]

Think about what the difference between a 9mm plunger and 11mm plunger is - i.e. if you plotted the output of one stroke on a graph over a period of time - what would the curve look like with 9mm vs 11mm...

Why would this suit one engine vs another...

so if it was you, would you say uprating the turbo would be a better improvement than more fuel...

The 2.1 will make better use of the fuel the 9mm can provide.

Bit limiting factor for 9mm's on 1.9's is injection duration. People upgrade to bigger plungers to allow more fuel for a shorter injection duration. The 2.1 however would be more able to use the injection duration than the 1.9 without spewing all the extra fuel straight down the exhaust...