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[GmasterT]

of the omega, namley the V8 version... are the diff and driveshafts the same as on the MV6's or are they beefier? Just wondering as Im considering putting my chevy V8 into my megs to use as my comp car for drifting next year

[2woody]

diff bigger, won't fit into rear subframe without modification.

two choices - either drill subframe or get a Carlton / Omega A subframe and weld the rear "ears" from an Omega B onto it.

driveshafts - haven't measured them yet, but have bolting flange at both ends.

might have bigger drive flanges, too

do you really need a bigger diff. As far as I understand, drifters spend most of the time with little rear traction, so diff dtrength is unimportant.

diff & transmission strengt is most important for less powerful cars - the worst case in Omega-land being 2.5 chipped TD Estate going up a hill towing a caravan.

[GmasterT]

Hi woody, thanks for replying

Yeah, we need big strong stuff sadly, this year I have used a friends skyline in the JDM allstars series and early in the year blew a diff input shaft and gearbox. It only has 250bhp! We have uprated to GTR backend and later/bigger engined gearbox.

Next year Ive decided to go different and use my special. I did well in what was essentially a stock nissan, but need more grip and power. Also, we do lots of clutch kicks etc so the running gear does take a punishing.

It currently has a welded diff (hope to upgrade to a proper 2way tho) and I did a driveshaft with just the V6... again, clutch kicking. Plus i will be looking to run 255 wide tyres (I know what your thinking, but you need grip to give control and go sideways as fast as possible)

Anyway  the other reason is that it would be easier to get an uprated/2way diff for the holden Id have thought too. Are the holden version the same as the monaro too?

 

[2woody]

yes - same

Lotus Carlton is probably the easiest fit - you'll need diff  ( same as Commodore / Monaro ), driveshafts and drive flanges.

if you go the Holden route, then you'll need diff and to get some driveshafts made. I think that the subframe is the same, just with a bit of widening in the middle.

I have made a couple of Carlton/Omega hybrid subfrmaes in the past (have jig), you'll also need to do this. Carlton Holden and Lotus use single central diff mount. Omega uses twin mounts on the subframe instead. Can make subframe for you if needed.

[GmasterT]

Cheers Woody, where abouts are you from?

I gather if I was to get a subframe set up complete with diff and hubs etc from a holden/monaro then in theory would just bolt straight up to the omega as a straight swap?

Oh, btw, a friend of mine has used nissan (CA/RB engine) water pump pulleys as locking collars on his subframe 

[2woody]

no it won't - the subframe is a couple of inches wider.

that's why you need to adapt one - it's not hard really.

have you got a spare Carlton rear subframe ? Oh wait a minute, I've got one. That means I can supply you a subframe with mounts to go straight onto an Omega B, ready for your new diff. You'll need only driveshafts then. Modified Lotus ones ?

[GmasterT]

Ah, I see... ummm, sounds good, although I like the idea of 'standard' driveshafts as they are easier to source and buy when they break 

But if its the best way then fair enough. If wont be for a few months yet as getting stuff/ideas together.

Where abouts are you based? And where is the best place to get a diff

[2woody]

oh yes, you did ask - I'm in Northumberland, so nice and local 
I do travel a lot, tho.

I have the back axle off the Holden at the moment, so let me have a couple of days to play around with some bits.

either ebay or Australia for diffs. I have a mate out there, so could get a diff sent over.

[GmasterT]

Legend! Cheers woody

Do you have your own company or is it just hobby stuff?

[2woody]

I'm a car designer by trade. work for a large company, but have all sorts of handy skills

"legend" is stretching it a bit tho

[Entwood]

I'm a car designer by trade. work for a large company, but have all sorts of handy skills

"legend" is stretching it a bit tho

I wouldn't describe what you are involved with these days as "cars" .... 

 

[2woody]

surprisingly similar - all the same equations, just bigger numbers.

[GmasterT]

moved on then?

Anyway, spoke to a friend of mine at a drift day today (runs a saab 2.3 in his omega) about the front crossmembers/subframes.

He said that the monaro one sits further forward and runs rack and pinion steering.

I dont want to complicate things further, but is this so? Im not sure what the lock differences would be, but I am concerned about the steering box potentially being in the way of hot exaust manifolds (I gather this is why it is different)

[2woody]

Holden does indeed have a different front subframe. Would you believe that they still use the ling-type suspension as per Opel Monza ? But at elast they do have a steering rack.

Had I not seen one or two V8-powered Omegas recently, I would have said that the steering box would preclude V8 fitment on space grounds, but it appears to be possible.

regarding the heat issue, that's a red herring. The steering box on the Lotus Carlton seems to survive and that's right next to two very big turbochargers

[Omegatoy]

Omega TD has the turbo right next to the steering box also!!!!