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[Ianpinder]

Hey guys, I’ve got an Astra Mk3 Van with a Calibra V6 C25XE engine in, now I wanna buy an Omega 3.2 MV6  engine, Is it a ball ache to fit or really easy?

[Doctor Gollum]

Keep the 2.5 wiring and sensors and manifolds and it will drop straight in.

[Ianpinder]

What about the ECU …. The bigger injectors on the 3.2

[Doctor Gollum]

What about the ECU …. The bigger injectors on the 3.2

Sure, you can fit the 3.2 injectors, but why make life more complicated...

The Astra and Calibra had cabled throttles. The 3.2 doesn't so you need alot more than just the engine if you go down that road.

[Doctor Gollum]

What about the ECU …. The bigger injectors on the 3.2

Sure, you can fit the 3.2 injectors, but why make life more complicated...

The Astra and Calibra had cabled throttles. The 3.2 doesn't so you need alot more than just the engine if you go down that road.

The engine is otherwise essentially a bigger bore version of the C25. Dropping a bare 3.2 in would essentially be akin to swapping in another C25.

The ECU should allow for the increased air going in and add fuel to compensate.

[sjc]

Would the 3.0 not be a better match? 

For the extra 5bhp the 3.2 gives over the 3.0 I'd say you could potentially have a lot of issues to contend with on the electrical side... sensors having different connectors... different coil pack setup...

Bung a set of 3.2 manifolds on a 3.0 and you'll probably make up most of the power difference with that alone.

[Doctor Gollum]

Would the 3.0 not be a better match? 

For the extra 5bhp the 3.2 gives over the 3.0 I'd say you could potentially have a lot of issues to contend with on the electrical side... sensors having different connectors... different coil pack setup...

Bung a set of 3.2 manifolds on a 3.0 and you'll probably make up most of the power difference with that alone.

The 2.5 sensors and loom etc should swap straight onto a bare 3.2.

Given that the van currently works with the 2.5, swapping the 3.2 wiring etc would be far more complicated than an Astra C needs to be

[TheBoy]

For performance, the 3.0l is much better than the 3.2.  The 3.2 (and its sister, the god awful 2.6) are poor substitutes for the 3.0 and 2.5.

If you're prepared to do a lot of work, the 3.2 might have potential, either with forced induction or doing something about the stupidly low CR

[jb]

3.0 is a better unit for your conversion and totaly compatible with your 2.5 ancillaries.

[Doctor Gollum]

3.0 is a better unit for your conversion and totaly compatible with your 2.5 ancillaries.

As is the 3.2.

Any performance 'shortcomings' of the 3.2 will be largely irrelevant in an Astra van. About the only piece currently fitted to the 2.5 that won't fit either the 3.0 or 3.2 is the inlet divider as the 2.5/2.6 divider is a smidge narrower.

I would add that the chances are that anyone bemoaning the difference between the 3.0 and 3.2 hasn't experienced a 3.2 running with a mechanical throttle as most of the perceived differences between the two boil down to the DBW throttle response.

In short, to the OP, fit whichever you can get your hands on most cost effectively and keep the cabled throttle and engine electricals from the 2.5.

[TheBoy]

3.0 is a better unit for your conversion and totaly compatible with your 2.5 ancillaries.

As is the 3.2.

Any performance 'shortcomings' of the 3.2 will be largely irrelevant in an Astra van. About the only piece currently fitted to the 2.5 that won't fit either the 3.0 or 3.2 is the inlet divider as the 2.5/2.6 divider is a smidge narrower.

I would add that the chances are that anyone bemoaning the difference between the 3.0 and 3.2 hasn't experienced a 3.2 running with a mechanical throttle as most of the perceived differences between the two boil down to the DBW throttle response.

In short, to the OP, fit whichever you can get your hands on most cost effectively and keep the cabled throttle and engine electricals from the 2.5.

The 3.2 is a penny pinched shadow of the 3.0, and runs at a much lower compression ratio (to save the expensive of having an EGR).  That's irrespective of the throttle or ancillaries attached.  So, as a straight swap in for a new project, the 3.0l is always the best option from the Omega V6 engines, both for performance and for economy.

The 3.2 becomes more worthwhile if you spend a lot of money, including forced induction and potentially re-camming (and the associated remaps needed).  Without forced induction, the 3.2 is a poor substitute compared to the 3.0l, and is a shed load less economical as well...   ...not that forced induction will help with the latter!

[Raeturbo]

Can’t see how you say that,  the 3.2 has more torque and BHP throughout the entire Rev range.

[Sir Tigger KC]

Can’t see how you say that,  the 3.2 has more torque and BHP throughout the entire Rev range.

Posted for Rae. 

[Raeturbo]

Thank you kindly Steve👍

[Sir Tigger KC]

Thank you kindly Steve👍