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Author Topic: X25XE to X30XE  (Read 9926 times)

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GrahamT

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X25XE to X30XE
« on: 21 May 2018, 13:08:06 »
Has anyone converted their 2.5 manual to 3.0?

If so was it worth it and did the 2.5 gearbox survive?

Thanks
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henryd

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Re: X25XE to X30XE
« Reply #1 on: 21 May 2018, 13:09:37 »
Easy swap as plug and play but AR25 gearbox will not cope with 3.0 torque
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Re: X25XE to X30XE
« Reply #2 on: 21 May 2018, 13:18:17 »
How many miles has the manual box done ?

I ran a 3ltr with a R25 box with no problems but it was a relatively low millage box with only 90K on it.


With the R28's liable to have plenty of miles on by now / in short supply and the R30 like rocking horse shite, i'd just do it and enjoy  :y :D :D
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Re: X25XE to X30XE
« Reply #3 on: 21 May 2018, 13:44:13 »
Yep, the manual 2.5 gearboxes are no problem with a bit more power. It's the automatic gearboxes that are an issue.

You might want to consider a diff with a taller ratio, though, but you can see how it goes with your current diff first.
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GrahamT

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Re: X25XE to X30XE
« Reply #4 on: 21 May 2018, 16:58:07 »
Thanks guys.

A few more questions. Finding a x30xe from an auto doesn't seem to be a problem. But will my 2.5 flywheel fit and will an auto ecu be happy running a manual?
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Re: X25XE to X30XE
« Reply #5 on: 21 May 2018, 17:28:07 »
Quote from: GrahamT on 21 May 2018, 16:58:07
Thanks guys.

A few more questions. Finding a x30xe from an auto doesn't seem to be a problem. But will my 2.5 flywheel fit and will an auto ecu be happy running a manual?





IIRC if its a auto ecu with a manual box, you need to ground a wire to earth  or the engine wont run  :-\
If you do a search on here, you should find it  :y

As for the R25 gearbox with the auto's (3.91) diff, you will find that the revs will be about 200 rpm higher at 70 mph ish so depends on how deaf you are or how much motorway driving you do tbh.

I run a 3.2 / R28 box with the auto's diff and it gets off the line very well  :-X :D.

Pros are you can stick it in 5th at 30mph and it will pull away with ease.
Cons are 1st is too low BUT i've a lpg tank in the back and occasionally pull a pikey van so that 1st really helps getting out of junctions quickly  :y
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Re: X25XE to X30XE
« Reply #6 on: 21 May 2018, 17:41:02 »
Quote from: henryd on 21 May 2018, 13:09:37
Easy swap as plug and play but AR25 gearbox will not cope with 3.0 torque

If I had read the post properly I would have read the manual bit :-[ :-[
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GrahamT

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Re: X25XE to X30XE
« Reply #7 on: 21 May 2018, 17:48:36 »
My car is already a manual and as far as I can tell has the same diff ratio as the 3L.

I have actually contemplated putting in the auto diff to get a bit more acceleration.

As right now it sits at about 2800rpm at 70mph.

Thanks
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Re: X25XE to X30XE
« Reply #8 on: 21 May 2018, 18:04:48 »
From memory - the flywheels are interchangeable, but the spigot bearing on the end of the crank will need swapping for your manual one.
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Re: X25XE to X30XE
« Reply #9 on: 21 May 2018, 18:58:16 »
Quote from: Migv6 on 21 May 2018, 18:04:48
From memory - the flywheels are interchangeable, but the spigot bearing on the end of the crank will need swapping for your manual one.



Yup  :y
Also the 3ltr engine will also run okay on a 2.5 manual engine ecu abit very slightly down on power due to the slightly reduced fueling right at he top end  :y
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GrahamT

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Re: X25XE to X30XE
« Reply #10 on: 21 May 2018, 19:08:41 »
Quote from: tigers_gonads on 21 May 2018, 18:58:16
Quote from: Migv6 on 21 May 2018, 18:04:48
From memory - the flywheels are interchangeable, but the spigot bearing on the end of the crank will need swapping for your manual one.



Yup  :y
Also the 3ltr engine will also run okay on a 2.5 manual engine ecu abit very slightly down on power due to the slightly reduced fueling right at he top end  :y

That's good. So I can swap the engine over while I look for the correct ecu, transponder and chip.

One other question just to make life a little easier. I take it the wiring harness etc for the engine management is the same for the X25XE and the X30xe?

Thanks
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Re: X25XE to X30XE
« Reply #11 on: 21 May 2018, 19:41:15 »
Im sure it will be the same. 3.0 ECU etc. shouldn't be difficult to find. Not many people will be looking for one either so I wouldn't pay too much money for one.  ;)

Edit. One here for £20.  :y
https://www.ebay.co.uk/itm/VAUXHALL-OMEGA-1994-9-3-0-V6-COMPLETE-ECU-UNIT-IGNITION-MODUAL-1-KEY-CHIPS-AF-/332552551874
« Last Edit: 21 May 2018, 19:44:32 by Migv6 »
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Re: X25XE to X30XE
« Reply #12 on: 21 May 2018, 19:53:42 »
Quote from: GrahamT on 21 May 2018, 19:08:41
Quote from: tigers_gonads on 21 May 2018, 18:58:16
Quote from: Migv6 on 21 May 2018, 18:04:48
From memory - the flywheels are interchangeable, but the spigot bearing on the end of the crank will need swapping for your manual one.



Yup  :y
Also the 3ltr engine will also run okay on a 2.5 manual engine ecu abit very slightly down on power due to the slightly reduced fueling right at he top end  :y

That's good. So I can swap the engine over while I look for the correct ecu, transponder and chip.

One other question just to make life a little easier. I take it the wiring harness etc for the engine management is the same for the X25XE and the X30xe?

Thanks





When I dropped a 3ltr lump into my 2.5, All I needed was the bearing because the 3ltr lump came off a auto  :y
Forget about the shorting wire bit  ::)
That was for a auto engine ecu  :y

Also iirc, the 2.5 manual diff is a 3.7 so again just bolt together then go and play  :y :D
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GrahamT

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Re: X25XE to X30XE
« Reply #13 on: 21 May 2018, 20:03:51 »
To find a decent engine now.

Thanks for all the advice. I have a week off work in nine weeks. Enough time to find engine clutch spigot bearing etc.

Thanks again.
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Migv6 le Frog Fan

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Re: X25XE to X30XE
« Reply #14 on: 21 May 2018, 20:23:13 »
Quote from: GrahamT on 21 May 2018, 20:03:51
To find a decent engine now.

Thanks for all the advice. I have a week off work in nine weeks. Enough time to find engine clutch spigot bearing etc.

Thanks again.

Here ya go.  :y http://www.omegaowners.com/forum/index.php?topic=142594.0


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