![]() | Home > Technical (L405) > Wheel Alignment Question |
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Alex1976 Member Since: 22 Mar 2023 Location: Bucks Posts: 86 ![]() ![]() ![]() |
You need to find a good garage who know what they are doing. The L405 has to be put into ‘Tight Tolerance Mode’ using diagnostic equipment such as the GAP IID. Unless this mode is set before setting the alignment it will never be correct.
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Salsbury Member Since: 19 Jun 2022 Location: Alberta Posts: 96 ![]() ![]() ![]() |
Thanks Alex, that's great info. |
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ChrisJC Member Since: 14 Sep 2023 Location: Northants Posts: 100 ![]() ![]() ![]() |
What is Tight Tolerance mode?
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Alex1976 Member Since: 22 Mar 2023 Location: Bucks Posts: 86 ![]() ![]() ![]() |
It is a setting that can be activated in IID GAP or other software that it sets the car at the optimum position to set up the alignment correctly. If not in this mode I believe the car will try to compensate for any adjustments made and effectively be working against any inputs made by the person adjusting the alignment. |
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West Yorks V8 Member Since: 25 May 2020 Location: West Yorkshire Posts: 43 ![]() ![]() |
Hi Gents
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3028 ![]() ![]() ![]() |
Tight tollerance mode just adjusts each corner to the precise calibrated height value rather than the +/- 10mm of normal operation. For a 'perfect' wheel alignment it's good to have this enabled but only if you have recently done a proper calibration procedure to ensure the reference heights are exactly right. Also a perfect wheel alignment is only possible if all your suspension joints and bushings are in an as new condition with no wear as dynamic loading of the suspension during use is not tested during a typical wheel alignment procedure. It's also possible to do a 'good' wheel alignment without tight tollerance mode enabled as small height variations won't make a big difference to the main values for toe, castor and camber which all have a range of values (tollerance) rather than a single perfect value. 2012 TDV8 Vogue (L322) |
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Salsbury Member Since: 19 Jun 2022 Location: Alberta Posts: 96 ![]() ![]() ![]() |
Cheers, JayGee, for the Tight Tolerance Mode crash course. I was on the brink of phoning every tyre shop in town, grilling them on TTM, and blacklisting anyone who didn't have a clue! |
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