copied this straight of cliodci.net
so it might be worth taking some of the things mentioned it to consideration mate before turning up the boost, cause i bet you dont want to spend a bit of money on a turbo only for the rest to let you down.
65 bhp -
No blue letters in the word DCI on the sidestrip.
No intercooler.
Turbo is a 5435 970 0000 Borg warner K series.
JB3 gearbox pretty much same as 1.6 16v.
Engine codes - K9K 704, K9K 700
OVAL PLATE CB07 (Inside of drivers door)
Standard Turbo Boost Pressure = 1 Bar (14.5psi)
Standard Fuel Pressure = 1400psi
No intercooler
80 bhp -
Blue I in the word DCI on the sidestrip.
Large Intercooler located infront of the radiator.
Injectors 15% more efficient than 65's.
Slightly different turbo to 65 (5435 970 0002 Borg warner K series).
JC5 gearbox pretty much same as 2.0 16v. From 2004 onwards JH3 and JR5 boxes were also fitted.
Engine code - K9K 702
OVAL PLATE CB08
Standard Turbo Boost Pressure = 1.2 Bar (17.4psi)
Standard Fuel Pressure = 1400psi
100 bhp -
Blue CI in the word DCI on the sidestrip.
Small fat intercooler (17% more efficient than 80 ic). Located infront of the radiator at the bottom.
Same injectors as 80.
Same fuel pump as 65 & 80 but runs at 1600 bar
Again, more efficient, variable geometry turbo (5439 970 0030 Borg warner K series)
Different block and head and different injection set up to 65 & 80 with the 100 having a stronger crank, stronger rods and pistons.
Inlets on the head are bigger, different cam and ex manifold.
Gearstick, reverse is down and right as opposed to up and left with the lift.
Gearbox is a JR5 120. (5 Speed box as fitted to petrol lagunas, no renault 6 speed box fits!)
Engine code - K9K 712.
OVAL PLATE CB2G
Standard Turbo Boost Pressure = 1.25 Bar (18.1psi)
Standard Fuel Pressure = 1600psi
Misc -
The reason the Pistons were changed on the dci 100 was due to the extra fuel pressure causing issues with the 65/80 pistons - worth noteing if you plan on changing fuel pressure
The dci 65 and dci 80 turbo is good for 1.5 bar but the dci 65 will NEED an intercooler to reach these sort of figures reliably and really the dci 80 will need a dci 100 spec intercooler at least too!