What TDi models are there?

[Trickyboy]

I'm aware there are 110, 130 and 150 right? What's different about the engines?

[Rhyso]

SDI 75 non turbo
TDI 90
TDI 110
TDI 115 PD
TDI 130 PD
TDI 150 PD

first one is self explanatory

90 and 110 i think are common rail diesel engines

115, 130 and 150 use the Pump Duse system where each cylinder has a high pressure injection unit

go for the 110 engines or the PD engines as they give you the best overall performance and economy and coupled with a remap surprises a few people 

[golflad]

i would certainly recommend going for the 150 pd engine as the gains you can get are awesome. they also benefit from a front mount intercooler as standard and i was gonna get forge motorsport to custom build one for mine but said they couldn't improve on the original. with a remap, decat and induction kit, mines touching almost 200bhp and it goes like stink. even some of the scoobies don't stand a chance.