Cobra's have only been coming with an IRS rear since 1999. Are you sure you can even adapt an IRS into your 89 without major modifications? Additionally, the level 5's are rated at 950RWHP.bditty50 said:Hello I'm looking to swap my solid axle from my 1989 notchback to a cobra irs. I think its well worth it in handling even though I have all the maximum motorsport 3 link rear parts and torque arm. I want to step it up to an IRS for handling and put all the kenny brown tubular parts. These parts are said to have a 40% weight decrease on an IRS. Then if you go with the level 5 halfshafts they can handle 1000 hp. They have been able to handle cars in the 9's. The research in weight difference never seems to be sure I cant figure it out either I've asked everyone. I think the live axle so I heard weighs 150lbs so if the IRS weighs 150 more do the math. The IRS is more expensive in the parts department but, I think its totally worth it.
Which IRS are you wanting to know about? The pre-03/04 Cobra IRS? A stock 03/04 IRS? A modified IRS?Dope 97GT said:what kind of power can the IRS hold well...thats why i thought most people swapped them out because they are not as strong and cheaper to upgrade?
Uncle Meat said:Which IRS are you wanting to know about? The pre-03/04 Cobra IRS? A stock 03/04 IRS? A modified IRS?
Most people swap them out because they are costly to upgrade for high HP cars. They are also heavy and of course prone to wheel hop. If a Cobra owner wants to drag race his car a lot then a straight axle is the way to go.
U.M.
Depends on how bad you let it wheel hop.Dope 97GT said:well im planning on getting a 03/04 cobra in the spring and will prolly just do exhaust tune cai and pulley...so i was just wondering if the IRS in the 03/04s were reliable for around 450-500hp.
bditty50 said:Well I emailed Kenny Brown and they say they can still ship parts so I dont know whats the deal. I read the article in MM&FF and they installed a Control Freak IRS into a 2005 mustang. I contacted them to see if they had fox chasis stuff and they will produce it because of alot of requests. The problem is their kit is almost 10,000 because they do a low production of parts and they pay alot of attention even going to lengths of cryogenically freezing metal parts for strength. The only part that they have to swap to a stock IRS is their own differential. Their differential by itself is rated at 750+hp which is great and has more meat around the pinion where people normally have problems. It also has a forged aluminum cap. So I'm thinking about using their diff. for my swap and getting Kenny Brown tubular parts. This should make for a good setup. Another thing with IRS is to keep the diff. cool they get very hot.
Control Freak http://www.bluemooncars.com/bmm-store-catg-cfs_tubulararms.htm
EXTRPR50 said:Has anyone done any research on if there is any weight savings going from a Cobra IRS to a live axle? I know there has to be some hardcore guys looking for every bit of weight savings. I was curious since I always read how heavy the 03-04's are.
And is it cost efficient?
95 GT, soon to be sold, 03-04 will replace.
U.M., I don't think you are comparing apples to apples in this photo. The 8.8 in the pic shown doesn't have brakes, shocks or upper and lower control arms, all of which are on the IRS piece. That's not to say that the solid axle isn't lighter, it is, I just don't think this picture gives an accurate representation of the differences.Uncle Meat said:Cobra's have only been coming with an IRS rear since 1999. Are you sure you can even adapt an IRS into your 89 without major modifications? Additionally, the level 5's are rated at 950RWHP.
Picture of an 8.8 sitting next to a IRS from an '03 Cobra. I can see 150lb difference...
U.M.
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