Hello everybody,
I've been looking into doing an IRS rear conversion on my Oval Bug, and I was wondering if the rear suspension assembly from the rear torsion tube rearwards from either a SWB (pre 69) 911 or a LWB could be made to work. The reason I'm asking is because I actually own all these parts, and I figured I'd put them to good use. I should add that the rest of the suspension will be comprehensively re-engineered (lowered, cambered, stiffened, etc) in order to end up with a well-sorted car.. What do you guys think?
would be a great idea but the rear trailing arms on a 911 are a couple of inchs too long. would have to move the pick up point forwards? Can you measure them compared to the vw IRS ones?
alex
Forget it... why re-invent the wheel! No benefit... Get a late-model pan instead
Pay your debts, CxxT
Go for it I say! If it can be done do it!!!!!🙅
Alex,
I take it to mean that they're longer - thus stretching the wheelbase, or do they widen the track? I would have thought that the 911 rear end is identical to the 944 rear end...
VWCool,
I'm "reinventing the wheel" as you call it because I already own these parts, and because they are hi-po and come with disc brakes as standard, no messing around with adapters, etc...
Anybody else care to comment?
hydra wrote:I'm "reinventing the wheel" as you call it because I already own these parts, and because they are hi-po and come with disc brakes as standard, no messing around with adapters, etc...
Anybody else care to comment?
lol... funny you should mention brakes
http://www.aussieveedubbers.com/forum/viewthread.php?tid=36884&page=1
The rotors I began working with were freebies... since then I have spent around $4000. So make sure you're ready for the committment...nn[ Edited on 5-7-2005 by VWCOOL ]
Pay your debts, CxxT
Widen the rear and shorten the pan to compensate for the long box trailing arms and interference with apron. Are u intending on using porsche box. if so consider gear linkage you will need to modify. Grab that measuring tape.
I,m replacing the vw irs with a complete 944 rear end ,now I can comply with the 944 track and wheel sizes and I can channel the torsion tube to lower the car 60mm+ and still comply with not lossing 30% of suspenion travel.
Hi
I fitted steel 944 arms in my car, its a bit of work to cleance the chassis but the ease of adjusting is great.
Steve
malcolm wrote:I,m replacing the vw irs with a complete 944 rear end ,now I can comply with the 944 track and wheel sizes and I can channel the torsion tube to lower the car 60mm+ and still comply with not lossing 30% of suspenion travel.
Good idea. Your engineer should be okay with this
Pay your debts, CxxT
hydra wrote:Hello everybody,
I've been looking into doing an IRS rear conversion on my Oval Bug, and I was wondering if the rear suspension assembly from the rear torsion tube rearwards from either a SWB (pre 69) 911 or a LWB could be made to work. The reason I'm asking is because I actually own all these parts, and I figured I'd put them to good use. I should add that the rest of the suspension will be comprehensively re-engineered (lowered, cambered, stiffened, etc) in order to end up with a well-sorted car.. What do you guys think?
Hydra,Speak to Malcolm.This bloke has been through the shreaders with engineers and will be able to help you.:thumbJVLRacing
If you guys are absolutely certain that a 911 rear end wouldn't work without major surgery, then so be it.. I had a hunch that the 911 and 944 rears were identical, but it appears that they are not.
With that said, why do people go with a 944 rear end as opposed to the stock IRS setup? Is it for the brake disc setup, or are there other more subtle performance advantages to be had?
half the time it seems it's so they can tell thier girlfriends they have "Porsche' bits in the car:P
Pay your debts, CxxT
Hi
The steel 944 arms have easily adjustable toe & camber and the spring plates are height adjustable, Im told that they have extra strenghening, Im not sure of this. They also take Kombi CVs or you can fit a Beetle stub axle staright back in, they have a drum type hand brake which will hold you on a hill but thats about it and vented rear disc also various calipers can adapted. They will fit a Beetle IRS pan exactly like the original but will give a slight track increase.
The later 944 alloy arms will also fit a Beetle chassi but they will drastically increase track.
Theres nothing like the "P" word to impress people, just like HSV to the blue singlet brigade.
Steve
I,ve measured the steel 944 arm and the alloy 924 turbo arm and they will have the same track due to the drive flange but the 944 alloy arm or s2 is another 50mm per side increase but 100mm. using the porsche parts can help with engineering .I,m using a different drive flange with honda nsx rear brakes so my track will be almost the same as orignal beatle and I, also using a double wishbone front end from a mitsubishi l300 so I can legally run 7 " rims,the front end will be narrowed
@80mm.HYDRA TALK TO A ENGINNEER BEFORE DOING ANYTHING .
Hi Malcom
Im not sure about Vic roads but in NSW a 1972 pan or earlier makes things a little easier with wheels etc. This is what the NSW RTA say.
Vehicles built to comply with ADR 24 (after 1/1/1973 for passenger cars)
Tare weight Allowable rim width increase above the widest optional wheel available as original for the axle assembly used
Up to 800kg 26mm (1.0 inch)
801 - 1200kg 39mm (1.5 inches)
1201 & over kg 51mm (2.0 inches)
Vehicles which were not built to comply with ADR 24 (prior to 1973 for passenger cars)
Tare weight Maximum rim width
Up to 800kg 153mm (6 inches)
801 - 1000 kg 178mm (7 inches)
1001 - 1200 kg 204mm (8 inches)
1201 - 1400 kg 229mm (9 inches)
1401 & over kg 254mm (10 inches)
So according to these rules you could run a 4.5 + 1.5= 6.00 inch wheel or if you can convince Vic Roads to use the size of a optional sports wheel which is 5.5 inch.
Steve
in vic its 1" over standard if you can prove in writing beetles had 5.5" rims in the US or South America you might be able to go to 6.5" rims they don,t look at the weight of the car.Things are getting tuff with modified cars and this is all to people taking short cuts.With my car I want to run 17+ rims so to get a 17x6.5 and correct tyre size is hard and to comply with the overall diameter as well and 3 peice rims are $740 each for excellent quaulity rim.I found Enki have high quaulity 1 peice rims with kind offsets for beetles and a 17x7 rim weighs 6.5 kgs.
