Making a 159 RWD - Alfa Romeo Forum
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Making a 159 RWD

Hi guys,

Just really checking to see if this is possible?

I would assume if you had a Q4 this would probably be an easier conversion, but would it work?

Could the rear drivetrain handle 100% of the power going to the back wheels?

Currently have a 'normal' 159ti (in other words, it isn't a Q4)
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Not sure how good is the idea of making RWD a car with engine and gearbox weight distributed at the front axle.
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Anything is possible, you would need to be good at welding & fabricating and have access to a machine shop & lathe. You'd need to find a RWD gearbox and make an adaptor plate to bolt to your engine and then turn the engine through 90 degrees and make new mounts, and plumb it all in again.

The rear drivetrain will handle 100% of the power, but for how long, who knows.. If you're competent enough to spin your engine through 90 degrees and fabricate new mounts, then you could just as easily get a bigger & stronger diff from somewhere else and make it fit. Propshaft UK in Luton can make conversion propshafts & driveshafts if needed.

I'm not sure of the technicalities of removing the FWD aspect of the Q4 system, but leaving it transversely mounted and being solely RWD isn't a very good idea.

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I want a q4 setup for my gtv
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Originally Posted by Pud237 View Post
I'm not sure of the technicalities of removing the FWD aspect of the Q4 system, but leaving it transversely mounted and being solely RWD isn't a very good idea.
Very true.

I know I've mentioned this before, but Vauxhall tried that as a test during the Supertouring era.
They had the Cavalier 4x4 which allowed them to run a RWD version as well as the normal FWD. The RWD was slower. The transmission losses are far too high.
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The Q4 is rear biased to begin with so not a lot to gain really, other than loss of traction.
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Quote:
Originally Posted by turbonutters View Post
I want a q4 setup for my gtv
Does Q4 system from 155 fit?
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Have the standard FWD version, not a Q2/4 at all, it was a question to see if it was possible, which it is, but I don't have access to lathes etc and I'm a tad pants at welding
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Originally Posted by Mags159ti View Post
Have the standard FWD version, not a Q2/4 at all, it was a question to see if it was possible, which it is, but I don't have access to lathes etc and I'm a tad pants at welding
It's quite possible but you'd need to be used to over coming challenges which will definitely appear along the way. I know people who've rear wheel driven BMC Mini's , Peugeot 205's , Renault 5 etc --- awesome when done but always fitted with better powered units as opposed to just retaining the original lump
If you have to pay someone else to develop it phew £££££££ ---- forget it
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Quote:
Originally Posted by David C View Post
Very true.

I know I've mentioned this before, but Vauxhall tried that as a test during the Supertouring era.
They had the Cavalier 4x4 which allowed them to run a RWD version as well as the normal FWD. The RWD was slower. The transmission losses are far too high.
BUT it must be said, John Cleland had nothing but praise for it in a recent article saying even done the way it was (4wd converted to 2wd) it drove so much better and was more balanced, having had more development time he thought it would be better

As far as the idea i thinkyou were thinking of, buying a Q4 and emoving front shafts making it rwd, i did similar recently with my scenic RX4 which i was plannning to rob the runnning gear from for my superchared RS project... but it didnt work basically because its too electronically controlled like i think the Q4 system is and i had to convince it to carry on sending the power there rather than the 70-80% maximum

best way i can put it is it was like having your mum in with you, you booting it and your mum screaming in your ear to slow down before youve started getting anywhere (the mum being the ecu )

As far as full on rwd conversion.. thats the way im looking at now but its far more complex in the simpler easier areas than people look at,
Tunnel is easy
Rear floor pan diff mount it easy
Front leg engine mounts is relatively simple to manufacture
BUT the engine would in mine sit 1/3rd through where bulkhead now is so id need complete new front subframe design as half the rear frame load bearing points would now be compromised

Hardest part.. steering as the engine would be through the rack if left where it was so complete remanufacture there, many options but alot narower than needed

Then the undeniable fact that if i was to go to all the effort the current lump wouldnt make it worth it so id need build a forged lump for an honest reliable 240bhp-250bhp

Wayne

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