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[ZaneKaminski]

Hi all. I own a Cadillac Catera (badge-engineered Omega B) and my X30XE motor recently blew up on me. A friend and I plan to install a new engine, and I would prefer to install the slightly newer, larger Y32SE. The Catera is like 400 pounds heavier than to the Omega B and Cadillac for some reason decided to detune the 3.0 V6 by like 10 horsepower compared to in the Omega B... So the extra power and torque would be appreciated.

Anyway, I'm wondering about the specific differences between the 3.0 and the 3.2. Obviously the 3.2 has been stroked out more, and it has the variable-length intake manifold, but apparently it was a "complete redesign" of the old engine (so Wikipedia says). What does this mean? So yeah, any info on the specific differences between the engines would be good, thanks.

One of the other specific things I'm wondering about is the operation of the variable-length intake manifold. I assume I wouldn't get this functionality without swapping out the ECU. Is that correct?

Also, a quick third question. In the US, the Catera is equipped with the "4L-30E" transmission. Apparently the Omega B V6 has an "AR35" transmission. Are these the same things? And if so, then what is an AR25 in the other nomenclature?

[Marks DTM Calib]

A nice easy one, the core engine (e.g. heads, block etc) are the same design, the key differences are slightly larger bore and stroke plus a forged steel crank.

The standard 3.0 had variable inlet (multi ram) so this is the same.

The easy approach is to use the 3.2 as a core and swap the 3.0 engine components over and away you go (as the engine management system will be the same so will still operate correctly with the rest of the vehicle).

You will most likely have to do a very simple mod to the front pipes on the exhaust to make them mate to the 3.2 manifolds.

[Kevin Wood]

..and the answer the gearbox question, the AR25 and AR35 are both variants of the 4L30E gearbox.

AR25 was designed with a 250NM torque limit for the lesser engines, AR35 has a 350NM limit, for the 3.0 and 3.2 engines IIRC.

[05omegav6]

Being DBW, isn't the 3.0 in later Cateras not electrically identical to the 3.2... no SAI or EGR

[Marks DTM Calib]

Being DBW, isn't the 3.0 in later Cateras not electrically identical to the 3.2... no SAI or EGR

No, a few differences in injection setup sadly  .....plus as we know the 3.2 management setup is inferior to the 3.0 

[X30XE]

So the 3.0 ecu can work around the extra 200cc of engine capacity ? 

[05omegav6]

Being DBW, isn't the 3.0 in later Cateras not electrically identical to the 3.2... no SAI or EGR

No, a few differences in injection setup sadly  .....plus as we know the 3.2 management setup is inferior to the 3.0 

Only when fitted with the wrong gearbox ; D

[tigers_gonads]

Being DBW, isn't the 3.0 in later Cateras not electrically identical to the 3.2... no SAI or EGR

No, a few differences in injection setup sadly  .....plus as we know the 3.2 management setup is inferior to the 3.0 

Only when fitted with the wrong gearbox ; D

Bitch 

[biggriffin]

[/quote]
Only when fitted with the wrong gearbox ; D
[/quote]

Like what you already have,the Edwardian pudding stirred variety   

[ZaneKaminski]

Okay, this sounds quite doable. Can anyone provide any details on what needs done to the exhaust pipes to get it to fit together?

[Marks DTM Calib]

The top of the front pipes are likely to have a flange that sticks out circa 8-10mm around which is fitted the front pipe to manifold gasket, this needs cutting or grinding back to circa 3mm .

[ZaneKaminski]

Thanks for all the advice. I really appreciate it. I'm no mechanic (just a software engineer). How difficult do you think it'll be to remove the piece? What tool should I use? Like some kind of a file?

And does anyone know anything about the reliability of the 3.2 compared to the 3.0?

[05omegav6]

Far superior

[ZaneKaminski]

That's what I was thinking/hoping for. But why? What'd they change in the design? Or are they just manufactured better?

[Temetsy]

I think it's that Y32SE is the second generation v6 (or third if you think C25XE is first) and GM has fixed all the flaws and weak spots of the previous generation v6 engines. So it is basically just a better and bigger version of the old v6