No remapping/chipping as it's all mechanical.
I drive a mech IDI car myself and have extensively modified it to produce a lot more power, for the princely sum of £90 (about €110). Make sure you have a strong clutch, brakes, tyres and suspension first, you'll need them.
A lot of the work is in the pump. Stick with the Bosch, Lucas pumps are rubbish. The TD75 from memory has 8mm distribution head, waaaay to small to work with. Source a VW 1.9TDI VE pump and use it's head (10mm) or in my case I used a 2.5 Transit DI pump head (11mm)
Things to look at include:
- Timing advance (static and dynamic)
- Gov shim
- LDA grind
- Case pressure mod
- Distribution valve mods
- Throttle arm adjustment
Just for the diesel pump to fuel for that hp.
You'll need an intercooler. Look at an Opel Vivaro cooler, just the right size for a diesel bumper cutout
As for turbos, the TD75 has a little GT1549 (there's one on a shelf behind me) bin it and ask yourself do you want a terrific all rounder or serious top end power.
Good all rounder: go for a medium sized vnt setup. This will require a bit of microcontroller trickery. Volvo D5 turbo/Merc C220CDI etc would fit that build. This provides good spool at low rpms and full boost at a low enough rpm. Brilliant in the city and if you're not interested in top end power. Something like a Garrett GT2056S would also fit this criteria
Top end power: I use a K14-2 from a 3.0 Mercedes on a 1.9 diesel on my daily car. Spool begins about 1200rpm and by 3k rpm full boost develops, all the way to 5k rpm. The crossover to full boost @ 2 bar is something else, the pull from 3k to 5k in 4th gear is unreal :worship::worship::worship: the only downside is the car smokes worse than a train sub 1 bar boost.... :yuck:
I have a full build thread
here. Beware, it's extremely pic heavy and not a Fiat!!! Same principles apply
Any more q's just ask