Wide Track, widening front track
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Joined: Jul 2003
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This is kind of off-topic but the Perrin PSRS alllows set-up for more pro-lift rather than anti-dive which is exactly what the Subaru ALK does. This makes the suspension more supple giving better traction. Robi suggests setting up the PSRS that way - spacer on top and more. It definitely seems beneficial handlingwise, even though it has to have at least a slightly negative effect on roll center height.
Cool. I'm now a gravel and dirt duffer, so I wasn't planning on doing anything for anti-dive, anyway, since there's never enough grip for it to matter. In fact, that's one of the reasons I believe that gravel and dirt cars have struts, instead of double-wishbone, besides the obvious need to keep unspring mass down and wanting maximum travel -- because anti-dive isn't needed. In the rear, the small amount of extra weight to get some anti-squat is good, because there are times when you have a moment of grip, plus we try to turn with power, instead of the front wheels.
But the possibility of angling the front lower LCA for some anti-dive was still of great interest to me. I do daily drive the car, too, plus I drive to events (on paved roads).
As to widening, all I've done is run low-offset wheels and call it a day. Wheel bearings are a consumable, plus only +18 or less 15" wheels will stay off the toe-arm tab on the rear knuckle.
cheers
But the possibility of angling the front lower LCA for some anti-dive was still of great interest to me. I do daily drive the car, too, plus I drive to events (on paved roads).
As to widening, all I've done is run low-offset wheels and call it a day. Wheel bearings are a consumable, plus only +18 or less 15" wheels will stay off the toe-arm tab on the rear knuckle.
cheers
Given how close the lateral (out to the knuckle) is to the front pivot, raising or lowering the rear pivot would have almost no effect on roll center height. I'm surprised that it has much effect on dive or lift, unless you are spacing the rear pivot down quite a bit. I suspect that the benefits are coming more from angling the plane of the lower arm to match the direction of surface impacts, as this will definitely make the suspension more supple (nice word for it!), which will enhance mechanical grip.
In other words, I can see how the mod has the effect that is being described, but suggest that the benefit is coming from something other than anti-dive or -lift. I suspect that the benefits are coming from angling the plane of the LCA to match the impacts and the costs (in terms of increased dive and lift) are more that outweighed by this.
In other words, I can see how the mod has the effect that is being described, but suggest that the benefit is coming from something other than anti-dive or -lift. I suspect that the benefits are coming from angling the plane of the LCA to match the impacts and the costs (in terms of increased dive and lift) are more that outweighed by this.
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