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October 16, 2026, 06:37:05 PM

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[sicmic]

can anyone tell me the efect of the larger 9inch housing on the top control arm mounts.will increased height between top and bottom control arms on diff cause any problems?

[MarkZE]

9" moves the upper mounts up at least 80mm or so relative to bottom mounts depending on how you do it.

It does effect the geometry in a way that it moves the instant centre further back and downwards relative to the centre of gravity of the car.

Moving the IC back means the car is less likely to lift the front end on launch
Moving the IC down means it is more likely to plant the rear tyres into the track on launch.

Instant centre further back and down also has the effect of reducing top end stability although I have not found this to be an issue yet on my car.

My car plants the tyres hard then allows them to unload again after launch because I can''t get enough front end lift to pickup the front wheels properly.  I am going to mess around with front shocks to try to counteract this problem.

For street use the effect above won''t matter much, the main issue you have is clearance between the oot floor and the top of the mounts when you try to run the car at a lowered ride height.