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dasvolvo said:Why would you want to? seems like alot of $$$ and work, not to mention iirc parts are harder to find for the IRS setup
acbarnett said:I am the one with an IRS who is planning on swapping it into their car. It looks to be a really simple job, about the same difficulty-wise as converting an 850 to awd, but without any of the drivetrain worries. The only thing holding me back is a lack of a lift anf the confidence in my welding abilities to attach the spring seats and IRS subframe mounts. The other thing holding me back is my engine build project and the 500 wheel horsepower that I'm gunning for, and right now it seems like it's alot easier (read: proven) to route that kind of power through a volvo live axle. From what johnlane said, the halfshafts and CV joints seem to be the big weakpoint, along with the rearmost lower control arms. I want to look some more into halfshaft swapping on the IRS, and find a set of stronger halfshafts in a length that would fit the IRS. I also want to see what the strongest diff I can fit in the mk. 1 IRS housing is. With thanksgiving break coming up, I'm going to try to bring the IRS back out to school with me so I can get to work taking measurements of the rearmost lower control arms and getting newer stronger ones made in the machine shops.
If you aren't planning on putting large amounts of power through one, the IRS is definately something I'd try to do, as it shouldn't take more than a weekend to do the swap if you have the right equipment. I just don't have the lift that I feel I'd need to properly do the project. Another fun project which I plan on doing to the front end of the car is swapping the lower control arms and crossmember from an s90 and mounting them to 240 ABS hubs with the 940 strut tubes. That should give me the ability to mount R brakes while increasing front track width, decreasing my turning radius even more, and eliminating my need to use 25mm spacers in the front to run my peggies.
Boosted2003 said:Dude if you are going to lower the car then dont mount the spring seats just put coilover shocks on the car. It will make it alot easier. Just weld on the half of the mount so you can mount the IRS setup on.
V8 supercars don't use IRS
Why do you think all the serious racing classes use IRS cars?
The diffs, CVs and half shafts out of the 3 and 5 series Bowel Movement Wonders are tiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiny, esceially the woefully undersize 3 series crap, way smaller that what Volvo used in the IRS set up and Volvo's stuff is stoooopid small.SwedishFish said:I think this is a worthy proposition. Of course the easy way would be to nab a 760/780/940SE/960 rear end...yadda blah blah...but in my humble opinion the rear end out of a 3 5 or 6 series Bimmer would be perfect-IRS, LSD, and take as much power as you and yo momma can throw at it.
MACH FYV said:Neither do Porsches for the most part and they seem to do OK.
Because they are serious race teams with serious race cars and seriously deep wallets...not daily driven/weekend warrior Volvos with a couple of bolt-on parts.
You can probably go faster than you think with what's already under the car! If it were me, I'd make 100% certain I was completely out-driving the stock setup (with good tires/shocks/springs/swaybars/bushings installed) before attempting a conversion.
IRS = Nice to have in certain situations, but over-rated, IMHO.
It really depends on the circumstances. Australian roads aren't generally particularly racetrack-like in terms of smoothness, and what IRS does best is iron-out the mid-corner bumps so you're not hopping uncontrollably around corners.MACH FYV said:IRS = Nice to have in certain situations, but over-rated, IMHO.