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The Terminator
Suspension Modifications
Coil overs on IRS? Need help hooking with 800+ whp
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<blockquote data-quote="MalcolmV8" data-source="post: 15511883" data-attributes="member: 8854"><p>Hey Guys,</p><p></p><p>So looking for options to make my IRS hook. I think a big part of the problem is the lack of weight transfer when I step on it.</p><p></p><p>My setup</p><p>IRS: </p><p>Factory shocks</p><p>MM urethane bushings throughout.</p><p>Stock coils cut down 1/2" turn or so</p><p>MM drag links</p><p>295/55/15 MT on 10x15 rims</p><p></p><p>Front:</p><p>UPR coil overs approximately stock stiffness on factory shocks.</p><p>Sway bar still in place.</p><p></p><p>The problem: A brand new set of tires will hook in 2nd gear if heated but they only hold for a few WOT pulls and just get shredded and tore up so quickly. I mean like a few pulls in one afternoon and they're done. Then the whole rest of the tires life it's worthless. I can punch it at 70+ mph and just tear them up laying black lines.</p><p></p><p>The instant torque and throttle response of the high compression motor and the TVS spinning hard is fun as hell but making it hook has been a challenge.</p><p></p><p>When I compare my car to other cars that hook a big thing I notice is how flat and stiff my car is on launch and acceleration where as you can see the other cars squat in the rear and the front come up. My car doesn't flex back and transfer weight and over stresses the hell out of the tires.</p><p></p><p>So my thoughts are some coil overs in the rear with soft coils to let the rear squat when I punch it.</p><p></p><p>I was looking at these Koni adjustable shocks</p><p><a href="http://www.maximummotorsports.com/Koni-Single-Adjustable-Shock-modified-1999-04-Cobra-IRS-P1265.aspx" target="_blank">http://www.maximummotorsports.com/Koni-Single-Adjustable-Shock-modified-1999-04-Cobra-IRS-P1265.aspx</a></p><p></p><p>Which go with this matching MM coil over kit for the IRS and your choice of spring rate</p><p><a href="http://www.maximummotorsports.com/Coil-Over-Kit-with-Springs-Koni-SA-Shocks-rear-1999-04-Mustang-IRS-P512.aspx" target="_blank">http://www.maximummotorsports.com/Coil-Over-Kit-with-Springs-Koni-SA-Shocks-rear-1999-04-Mustang-IRS-P512.aspx</a></p><p></p><p>Has anybody used this? Any feed back? I hate to get all that and it makes no difference.</p><p></p><p>Up front I'm thinking of removing the sway bar and changing out those shocks/coil overs with something better. By better I mean an adjustable shock made for drag racing that will flex out easy on the hit and a softer spring that will let the front come up some. Thoughts?</p><p></p><p>Also it occurs to me I've been meaning to put subframes on for ever and keep forgetting. I'll get some full length subframes on too as I hear that helps.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 15511883, member: 8854"] Hey Guys, So looking for options to make my IRS hook. I think a big part of the problem is the lack of weight transfer when I step on it. My setup IRS: Factory shocks MM urethane bushings throughout. Stock coils cut down 1/2" turn or so MM drag links 295/55/15 MT on 10x15 rims Front: UPR coil overs approximately stock stiffness on factory shocks. Sway bar still in place. The problem: A brand new set of tires will hook in 2nd gear if heated but they only hold for a few WOT pulls and just get shredded and tore up so quickly. I mean like a few pulls in one afternoon and they're done. Then the whole rest of the tires life it's worthless. I can punch it at 70+ mph and just tear them up laying black lines. The instant torque and throttle response of the high compression motor and the TVS spinning hard is fun as hell but making it hook has been a challenge. When I compare my car to other cars that hook a big thing I notice is how flat and stiff my car is on launch and acceleration where as you can see the other cars squat in the rear and the front come up. My car doesn't flex back and transfer weight and over stresses the hell out of the tires. So my thoughts are some coil overs in the rear with soft coils to let the rear squat when I punch it. I was looking at these Koni adjustable shocks [URL]http://www.maximummotorsports.com/Koni-Single-Adjustable-Shock-modified-1999-04-Cobra-IRS-P1265.aspx[/URL] Which go with this matching MM coil over kit for the IRS and your choice of spring rate [URL]http://www.maximummotorsports.com/Coil-Over-Kit-with-Springs-Koni-SA-Shocks-rear-1999-04-Mustang-IRS-P512.aspx[/URL] Has anybody used this? Any feed back? I hate to get all that and it makes no difference. Up front I'm thinking of removing the sway bar and changing out those shocks/coil overs with something better. By better I mean an adjustable shock made for drag racing that will flex out easy on the hit and a softer spring that will let the front come up some. Thoughts? Also it occurs to me I've been meaning to put subframes on for ever and keep forgetting. I'll get some full length subframes on too as I hear that helps. [/QUOTE]
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Coil overs on IRS? Need help hooking with 800+ whp
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