je vais changer les 4 pneus sur mon roadster.
A cette occasion je souhaite refaire une géométrie.
Là dessus lorsque je parcours les forums en quête du bons réglage...il y a des pages et des pages de personnes qui indiquent des valeurs selon le rabaissement.
Or cela va l'encontre de ce que je croyais à savoir:
- quel que soit le rabaissment par défaut remettre la valeur de réglage de géométrie de base.
Ensuite si l'on modifie ce setup c'est dans le but d'obtenir une modification du comportement mais absolument pas pour lutter contre un éventuel rabaissement.
C'est quoi la vérité?
Valeur conseillée par https://www.flyinmiata.com/tech/alignment.php
A good alignment makes a huge difference to car handling. The standard numbers from Mazda are fairly vague and don't necessarily flatter the Miata. A precision alignment can make even a standard Miata more fun to drive.
These are the numbers that we use at Flyin' Miata on the NA/NB/NC Miata. They work well for cars fitted with our suspension kits or stock setups. There is no odd tire wear. Racers will want to vary their setup based on their particular needs of course. If you take your car to an alignment shop, ask them to come as close as possible to these settings. For a full discussion of what these numbers mean, you can read Miata Performance Projects.
It's possible that not all cars will be able to reach these numbers. If this is the case, please call our tech line (1 970 464 5600) and our techs will be able to advise you.
Front
Caster/Chasse: 5.0 degrees
Camber/Carrossage: 1.0 degrees negative
Toe-in/pince: 1/16", 0.15° or 9 arcminutes total (1/32", 0.075° or 4.5 minutes per side)
Rear
Camber/Chasse: 1.5 degrees negative
Toe-in/pince: 1/16", 0.15° or 9 arcminutes total (1/32", 0.075° or 4.5 minutes per side)
MazdaSpeed qui est l'officine officielle propose lors du montage de SES ressorts courts ces valeurs qui dépendent bien de la hauteur de caisse p6
https://mossmotors.com/media/instructio ... 1_inst.pdf
Voilà la recommandation de MazdaSpeed lors de la pose des amortisseurs sport => donc avec les ressorts d'origine! et les roues de 17" Là aussi cela dépend de la hauteur de caisse!!!
http://parts.arlingtonmazda.com/documen ... aSpeed.pdf
http://parts.arlingtonmazda.com/documen ... aSpeed.pdf
Front wheel alignment [17-inch wheel]
Item Specification
Total toe-in Tyre / Pince totale [Tolerance ±4 mm] (mm) 2
Rim inner (mm) 1.4±2.8
degree 0°11'±22'
Steering angle [Tolerance ±3°] Inner 38°42'
Outer 32°54'
Steering axis inclination (Reference value) 10°47'
Camber/Carrossage
[Tolerance ±1°] Vehicle height: From the end of the front fender to the center of the wheel (mm)
351-360 -0°51'
361-370 -0°31'
371-380 -0°14'
381-390 0°02'
391-400 0°15'
Caster/Chasse
[Tolerance ±1°] Vehicle height: From the end of the rear fender to the center of the wheel (mm)
349-358 6°34'
359-368 6°20'
369-378 6°06'
379-388 5°53'
389-398 5°39'
Note
• Unloaded vehicle: Fuel tank is full. Engine coolant and engine oil are at specified level. Jack and tools are in designated position.
• Difference between the left and right dimension for camber and caster is within 1°.
Rear wheel alignment [17-inch wheel]
Item Specification
Total toe-in Tyre / Pince totale [Tolerance ±4 mm] (mm) 3
Rim inner (mm) 2.2±2.8
degree 0°17'±22'
Camber / Carrossage
[Tolerance ±1°] Vehicle height: From the end of the rear fender to the center of the wheel (mm)
349-358 -1°42'
359-368 -1°25'
369-378 -1°11'
379-388 -0°59'
389-398 -0°49'
Note
• Unloaded vehicle: Fuel tank is full. Engine coolant and engine oil are at specified level. Jack and tools are in designated position.
• Difference between the left and right camber angle is within 1°.