Chris_in_PA Posted December 16, 2011 Report Share Posted December 16, 2011 Alcon, Was curious, has anyone put an IRS in a GT-500?? Would love to know; a) how much it cost, and B) how much improvement. Reason I ask, was watching a rerun of Top Gear last night (BBC America), and they showed them testing a GT-500. Hammond mentions about how the rear axle is old school, straight line stuff, etc. I know he's a Porsche fanatic, and all that. They ran the GT-500 round the track, and then bought in a Rousch, which apparently has an IRS, and it was about 2 second quicker. Just curious. Chris Link to comment Share on other sites More sharing options...
03 DSG Snake Posted December 16, 2011 Report Share Posted December 16, 2011 Roush has a stick axle. It is simply lighter and with 'aftermarket' suspension pieces. Link to comment Share on other sites More sharing options...
JeffJ Posted December 16, 2011 Report Share Posted December 16, 2011 Correct, the Roush does not have IRS. Probably was faster due to the less power. If you don't know how to manage the power, then you will hook up much better with less. With the less power of the Roush in this test, better tires, and better bushings, etc, of course it will be faster on the track. I always hate the argument over IRS on the Mustang. A properly set up stick rear can handle the track as well as IRS. Better in some areas of the corners, worse in others. With a perfectly smooth track, I'll take the stick axle over the IRS. You get into bumps on the track in the corners, and other odd characteristics of other corners, I'd take the IRS. This will be argued for eternity. Watch a Grand-Am Continental Challenge Race and compare properly set up Mustang stick axle to BMW IRS and see what the difference really is. Pretty much equal. Link to comment Share on other sites More sharing options...
marsh2o Posted December 17, 2011 Report Share Posted December 17, 2011 There is a discussion about former plans to produce an IRS for the current Mustang here: http://www.teamshelby.com/forums/index.php?showtopic=45888 But nothing ever came of it. The current Mustang was orginally desinged with an IRS in mind and there are rumors that the next generation Mustang, while having an entirely different body, may share many of the same suspension pick-up points -- possibly enabling a retrofit. But just one small difference in the design could make this extremely difficult, so no one should count on it. Link to comment Share on other sites More sharing options...
Rev Dennis Posted December 17, 2011 Report Share Posted December 17, 2011 The recent IRS Mustangs had problems with broken half shafts. Too much power. A heavier duty system is probably not worth the added expense. Certainly not for the drag racers. This coming from a road course guy. Link to comment Share on other sites More sharing options...
08KR525 Posted December 17, 2011 Report Share Posted December 17, 2011 I wouldn't put to much merit in what Top Gear says. They should be watched for entertainment only. They're the same ones that reported the GT500 didn't make 500 HP. They were running the car on the dyno and did not take parasitic loss into consideration. Link to comment Share on other sites More sharing options...
Chris_in_PA Posted December 18, 2011 Author Report Share Posted December 18, 2011 Thanks for all the feedback. I do love the show for it's entertainment, got hooked on it after they shot a Lotus with an Apache Helicopter. Link to comment Share on other sites More sharing options...
Freak Posted December 18, 2011 Report Share Posted December 18, 2011 They're the same ones that reported the GT500 didn't make 500 HP. Not to mention they claimed the GT500 was so named because it had 500 HP. Link to comment Share on other sites More sharing options...
jerseygator Posted December 18, 2011 Report Share Posted December 18, 2011 I love my stick rear. It's great for throwing it into a dougnut! :burnout: I wouldn't waste the time or money to change it. JMHO... Link to comment Share on other sites More sharing options...
MY500SS Posted December 18, 2011 Report Share Posted December 18, 2011 There was a GT500 with IRS at last years Vegas Bash. Ended up on a flatbed with busted hardware during the track event. Link to comment Share on other sites More sharing options...
TrakRat Posted December 18, 2011 Report Share Posted December 18, 2011 The Roush ate the GT500 because it had a full boat suspension kit on it. The stock 07 GT500 is widely known for not handling all that well. Bag the IRS idea as nothing perform or will be a cost effective as this: http://www.grigg ing.com/product_info.php?cPath=4332_4309_4328_2040_3680&products_id=606 Link to comment Share on other sites More sharing options...
NICK82 Posted December 20, 2011 Report Share Posted December 20, 2011 I've got a Porsche 911 (997 S), my live axle Griggs Racing Shelby will run circles around it. Link to comment Share on other sites More sharing options...
MY500SS Posted December 20, 2011 Report Share Posted December 20, 2011 The Roush ate the GT500 because it had a full boat suspension kit on it. The stock 07 GT500 is widely known for not handling all that well. Bag the IRS idea as nothing perform or will be a cost effective as this: http://www.grigg ...products_id=606 That's what I did to the SS......................works fantastic. Just ask the Z06 guys at Button Willow. Link to comment Share on other sites More sharing options...
SGT0225 Posted December 22, 2011 Report Share Posted December 22, 2011 That's what I did to the SS......................works fantastic. Just ask the Z06 guys at Button Willow. 9 days out of 10 a IRS is wasted cash. Link to comment Share on other sites More sharing options...
judgeman6970 Posted December 25, 2011 Report Share Posted December 25, 2011 100% not interested in an "IRS" stang....irs gto's, challengers & camaro's not only have wheel hop issues, but none of their stock half-shafts handle the power like a good old Ford 8.8....I love the stang's old-skool stick axle, but thats just me!! Link to comment Share on other sites More sharing options...
ChrisThorp Posted January 11, 2012 Report Share Posted January 11, 2012 http://www.mustangirs.com/ There ya go guys its been done ford designed it carrol shelby tested it but the stick axle was cheaper, lighter and performed just as well on the track. Just as MY500ss said the cars with alot of power like most of us have (600 and up at the wheels) just brake parts. sure IRS feels better on the street, over the potholes, but it sure as hell doesnt perform llike my stick axle with the griggs setup on willow springs. Link to comment Share on other sites More sharing options...
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