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2015+ IRS alignment and specs [Archive] - StangBangerz Forums

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redfirepearlgt
08-29-2019, 05:48 PM
Hey gang,

Just got the lock out kit and vertical links on the car today. Also got a hold of BMR and got Kelly's (he's no longer there btw) specs for optimal tolerance specs for camber and toe on the rear as well as the front for N/A and FI applications.

As for where to go? Brian at Finishline sent me down to Tire Discounters at Batavia on 32 (1169 OH-32 location) just passed Wyler on the same side. Their tech is a 40 year man who still is involved in racing and man is he a perfectionist. He knew exactly why Kelly's tolerances were what they are and he hit them dead nuts. I highly suggest going through the alignment (especially the rear) as the camber spec alone is to be 0 .00 - +0.15 degrees vice the stock negative camber numbers. This only optimizes contact patch on launching when the suspension squats from the weight transfer.

Below are the recommended specs that came from Kelly Aiken at BMR:

FRONT
Camber: -1.00 for N/A and -1.5 for FI
Caster: 6.00-8.00 range
Toe: In 0.05 per side, total toe .10 N/A and 0.0 for FI

REAR

Camber: 0.00 to +0.15 range. (as close as possible if zero cannot be achieved)
Toe: 0.12 in per side, total toe 0.24 (0.10 in per side, total 0.20 if toe bearings installed)
Thrust angle: 0.00

In addition to this are some settings for the Viking B358 series rear shocks if you are using them.

15-17 S550 :

3C/5R for street comfort
4C/7R for aggressive street
6C/9R for track

18+ S550

3C/5R for street comfort
5C/9R for aggressive street
8C/11R for track

Hope this helps you out.