Upgrades for IRS

Craig K. · 10-10-2005, 04:33 PM

Does anyone know of any good upgrades for the factory IRS?

Things I would like to know about are upper/lower arms, bushings and coil overs.

Also what about rear alignment, on the IRS is it adjustable or not, and if so what kind of racing specs are good?

I haven't searched much on the net, just seeing if someone has already done all the home work so I won't have to.

Italian LX · 10-10-2005, 05:53 PM

Quote:

Originally Posted by Craig K.

Things I would like to know about are upper/lower arms, bushings and coil overs.

We put the MM poly bushings in Joseph's Cobra. He says they made a pretty big difference.

Quote:

Originally Posted by Craig K.

Also what about rear alignment, on the IRS is it adjustable or not, and if so what kind of racing specs are good?

I know there are tie-rods to adjust toe, but I can't recall if there is any camber adjustments. I would imagine there would at least be some sort of eccentric bolt/bushing to adjust it some.

QWKSNKE · 10-10-2005, 06:07 PM

yes you can do all the necessary adjustments for alignment on a IRS stang.

Like Brian mentioned, there are bushings, stronger braces, and halfshafts that I know of to upgrade the IRS equipped mustangs

Craig K. · 10-10-2005, 06:55 PM

Thanks Brian and Lee,

I checked out MM web-site, they look like they have a lot of new products for them as well, including delron busings and a solid adjustable front mount. They also have a coil-over conversion.

I haven't found any tubular Arms yet, I'll keep looking.

Is there any way to tell from the outside if it is an '99/'01 or a '03/'04?

slvrbullit · 10-10-2005, 06:59 PM

Pull a half shaft and check the splines, 03/04 31 spline shaft and larger diameter.

Craig K. · 10-10-2005, 07:02 PM

yeah, I knew the 31 spline (older have 28, right?), if this works out I'll pull one.

QWKSNKE · 10-10-2005, 07:42 PM

01's are 31 spline also

Sendero · 10-10-2005, 07:57 PM

According to Jack Hidley at MM, you don't have to do much to make it a performer:

Quote:

Originally Posted by Jack Hidley

Installed Delrin bushing in both the upper and lower control arm inner pivots. This must be done very carefully to ensure low friction pivoting.

Installed a coilover shock assembly.

Installed a bumpsteer kit to remove the Ford installed roll understeer.

Installed an oil cooler to keep the differential fluid temperature under control.

Installed a solid differential mount to remove compliance and set the pinion angle to zero.

Installed polyurethane bushings between the subframe and frame.

This is on their 91 LX Track car.

Craig K. · 10-10-2005, 08:25 PM

Thanks Nathan, thats what I was looking at fron the MM site, forgot about an oil cooler though

TheJeanyus · 10-10-2005, 08:45 PM

The bushings made a difference in wheel hop, but it doesn't seem to have changed my 60' times any (still a best of 2.0). It does seem to bite a little harder coming out of turns now, though.

10-10-2005, 04:33 PM	#1
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	Upgrades for IRS Does anyone know of any good upgrades for the factory IRS? Things I would like to know about are upper/lower arms, bushings and coil overs. Also what about rear alignment, on the IRS is it adjustable or not, and if so what kind of racing specs are good? I haven't searched much on the net, just seeing if someone has already done all the home work so I won't have to. __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS

10-10-2005, 06:07 PM	#3
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Upgrades for IRS yes you can do all the necessary adjustments for alignment on a IRS stang. Like Brian mentioned, there are bushings, stronger braces, and halfshafts that I know of to upgrade the IRS equipped mustangs

10-10-2005, 06:55 PM	#4
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	Re: Upgrades for IRS Thanks Brian and Lee, I checked out MM web-site, they look like they have a lot of new products for them as well, including delron busings and a solid adjustable front mount. They also have a coil-over conversion. I haven't found any tubular Arms yet, I'll keep looking. Is there any way to tell from the outside if it is an '99/'01 or a '03/'04? __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS

10-10-2005, 06:59 PM	#5
slvrbullit Super Moderator Join Date: Dec 2004 Location: on the water Posts: 1,280	Re: Upgrades for IRS Pull a half shaft and check the splines, 03/04 31 spline shaft and larger diameter. __________________ 2012 Jeep Wrangler Unlimited--- too many mods to list, about to be sitting on 1 ton axles. 2000 Ford F-350 Dually Lariat LE Crew Cab Short Box 7.3 auto 168,000 miles

10-10-2005, 07:02 PM	#6
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	Re: Upgrades for IRS yeah, I knew the 31 spline (older have 28, right?), if this works out I'll pull one. __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS

10-10-2005, 07:42 PM	#7
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Upgrades for IRS 01's are 31 spline also

10-10-2005, 08:25 PM	#9
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	Re: Upgrades for IRS Thanks Nathan, thats what I was looking at fron the MM site, forgot about an oil cooler though __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS

10-10-2005, 08:45 PM	#10
TheJeanyus Administrator Join Date: Dec 2004 Location: Huntsville, AL Posts: 14,774	Re: Upgrades for IRS The bushings made a difference in wheel hop, but it doesn't seem to have changed my 60' times any (still a best of 2.0). It does seem to bite a little harder coming out of turns now, though. __________________ 1998 Mustang GT Coupe - World's Slowest Racecar 2005 Toyota 4Runner SR5 V8 2013 Volkswagen Jetta Sportwagen TDI