IRS Install: Final touches

Everything is in and it fits…what a success!  Final alignment touches are being done.  The last steps are to weigh and measure for the car’s final numbers.  Rob weighed the car and the final weight was 3375 lbs..  That is 48 lbs. heavier than the initial 3327 lbs. it originally weighed in at.


Mustang LX  (w/ torque arm & panhard bar)         3327 lbs.

Mustang LX (with IRS)                                            3375 lbs.

Difference                                                               +48 lbs.

One of the advantages of installing coil-overs, is that we can adjust the height on each spring.  Raising or lowering each corner also transfers weight from front-to-back and side-to-side, just like NASCAR when they add or take away wedge.  This is a bit time consuming…going back and forth adjusting each corner.  It’s first done with sway-bars disconnected, then when re-installed weight gets shifted, so more tweaking is necessary.  You also need to do this driver.  In the end, we got a very good ride height, stance and the best weight balance we thought was capable.

Front Left = 1037 lbs.               Front Right = 929 lbs.

Rear Left = 871 lbs.                   Rear Right = 864 lbs.

Wheel clearance

Wheel clearance

Wheel base remained the same…give or take a few centimeters.  The original wheel base measured was 57″ 7/16.  The after measurement with the IRS is about the same.  It’s hard to get an exact number like before with the SRA, because on a SRA the tires sit flat and a measurement is exact.  On the IRS each tire sits differently, not perfectly flat.  So to get a proper number you have to measure at 2 locations on the tire and get the average.  Anyway, it was close enough to say, that it remained the same.



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