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  •  » Cobra irs into a 1967 mustang

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    5/30/2014 10:13 AM  #1

    rdean9215
    Active Member

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    Registered: 5/27/2014
    Posts: 4

    Cobra irs into a 1967 mustang

    Hi everyone. I'm looking for tips/advice from people who have completed this swap. I bought a 2003 irs a few days ago and am starting to plan this out. I like the idea of the prefab bracket kit out there but not willing to pay an additional $3000 for just brackets and coil overs. Any help/advice would be much appreciated. I have read some where to raise the irs cradle up into the frame people have cut off the stock rubber mounts and welded directly to brackets that bolt to the frame rails.  I have read about someone using QA1 DS303 coil overs with qa1 9-350 springs. Anyone know if 350# springs would be enough?

    Little back ground on my mustang. Mustang 2 ifs and just added 2011 gt brakes to the front. Motor is a 347 with Kaase p38 heads. Looking to set car up for road racing with some weekend driving.

    Thanks

     

    5/30/2014 1:05 PM  #2

    DC
    Senior 24-7 FYI Addict

    Offline

    From: Marshall, MI
    Registered: 4/01/2013
    Posts: 1,251

    Re: Cobra irs into a 1967 mustang

    350 pound springs should be about right. I have 350 pound springs on the rear of my road racer and they work real well. As far as racing is concerned, the more solid you can mount the unit the better. But if you plan on much street driving, solid mounts may be harsh. I have a Jag IRS in my car and I did use some rubber bushings to mount the cradle to the chassis. I did not use real big ones so the movement is minor. I am really glad I did since the difference between my race car where everything is solid (no rubber) and the road car (which I do track days with) is large. The noise and vibrations in the race car would not work at all in a road car.

     

    5/30/2014 3:11 PM  #3

    6sally6
    Hyper FYIFORD ADDICT

    Offline

    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,906

    Re: Cobra irs into a 1967 mustang

    rdean9215 wrote:

    Hi everyone. I'm looking for tips/advice from people who have completed this swap. I bought a 2003 irs a few days ago and am starting to plan this out. I like the idea of the prefab bracket kit out there but not willing to pay an additional $3000 for just brackets and coil overs. Any help/advice would be much appreciated. I have read some where to raise the irs cradle up into the frame people have cut off the stock rubber mounts and welded directly to brackets that bolt to the frame rails. I have read about someone using QA1 DS303 coil overs with qa1 9-350 springs. Anyone know if 350# springs would be enough?

    Little back ground on my mustang. Mustang 2 ifs and just added 2011 gt brakes to the front. Motor is a 347 with Kaase p38 heads. Looking to set car up for road racing with some weekend driving.

    Thanks

    How does that Jon Kaase head-ed 347 perform?!
    Those P38's are suppose to eat AFR's for lunch!!
    6sally6
     

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    5/30/2014 3:21 PM  #4

    rdean9215
    Active Member

    Offline

    Registered: 5/27/2014
    Posts: 4

    Re: Cobra irs into a 1967 mustang

    Thanks for the advice DC. I may need to rethink removing the bushings on the cradle. May shorten them and to get the lower stance and additional tire clearance moving the front mounts to the inside of the frame but weld the bushing ends back. It will never be my primary car but I will want to take it out on the weekend some.

    6Sally6 I currently have the heads taken apart to clean the castings some and will then need to weld up some headers before I can get the engine to the dyno for tuning. I'm shooting for end of June. I'll be sure to post some results;)

       •Thread Starter
     

    5/30/2014 9:00 PM  #5

    jkordzi
    I FYI 24-7

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    From: Sequim, WA
    Registered: 12/28/2013
    Posts: 927

    Re: Cobra irs into a 1967 mustang

    rdean9215 wrote:

    Hi everyone. I'm looking for tips/advice from people who have completed this swap. I bought a 2003 irs a few days ago and am starting to plan this out. I like the idea of the prefab bracket kit out there but not willing to pay an additional $3000 for just brackets and coil overs. Any help/advice would be much appreciated. I have read some where to raise the irs cradle up into the frame people have cut off the stock rubber mounts and welded directly to brackets that bolt to the frame rails. I have read about someone using QA1 DS303 coil overs with qa1 9-350 springs. Anyone know if 350# springs would be enough?

    Little back ground on my mustang. Mustang 2 ifs and just added 2011 gt brakes to the front. Motor is a 347 with Kaase p38 heads. Looking to set car up for road racing with some weekend driving.

    Thanks

    I haven't done it, but I've read about it (kinda like the holiday inn express bit).  Day has a page devoted to swapping in a Jag IRS, and at the bottom is a link to a general IRS forum you may find felpful:

    http://dazecars.com/dazed/JaguarIRS2.html
     

    Cheap, Fast, Good:  Pick Any Two
     

     

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