Mk3 Cavalier Owners Club | Vauxhall Cavalier Dot Com

Want more power/speed any suggestions?

Take a look at these here.

https://forum.retro-rides.org/thread/129961

https://www.mk3oc.com/forum/threads/tun ... ine.82005/

These will tell you a lot more about tuning the Isuzu 1.7TD engine, than I would ever know.

Although I have read about removing the 'polo' ring before.
Which means taking the manifold off.

The rest is tweaking screw settings, such as the smoke screw, fast idle and slow idle.

Good luck.
Other than the faff of the manifold bit, it all seems quite easy to do.

Due to potential smoke issues, it may be necessary to record the initial settings for all the adjustment screws, so that they can be "put back" for the MOT.

And then returned to the "preferred" settings for when you want the car to be a bit more lively.

If you're any good at electrics you could always swap for a more modern diesel. Can't believe how much power my 1.7 cdti has in my Astra, I believe it uses the old izusu block with a 16valve head?. For the ultimate though you could always try fitting the 3.0 CDTI V6 izusu engine that I've had in 2 vectras, in both cases the auto box failed, down to the sprag clutch. But there are some manuals out there.

The Astra-H CDTi unit is very complicated to wire in, with fly-by-wire throttle controls and CAN controllers all over the place.

Not sure if the Combo van variant of the Corsa-C would not be easier despite only being a 1.5TD.
The van uses very minimal CAN systems.

I suppose it depends on what you want to do or spend to achieve the improvements.

The tweaks in the links above require minimal funds. Possibly a few gaskets and a little bit of coolant / oil to top up as required.
I would also include a full diesel service before you start tweaking, to ensure you have the best possible starting point.

Engine changes can be very expensive and complicated to achieve.