how low can u go

[ghetto3]

How low can you swing a BA before you start to hamper the suspension geometry? I have BC V1 coilovers wound down with about 10mm to spare on the front (juuuussst gets up driveway) it has about 70mm ground clearance at lowest point (FTRTA) . Can i go lower and still expect it to handle well?

[D-Train]

The way i see it, until its fouling the gaurds in any way the only thing its doing is increasing camber and lowering centre of gravity

Dean

[Rupewrecht]

Once the lower control arms are no longer flat, then you're hampering your roll centre.

[ghetto3]

Everyone knows how important stance is, but my car is packing a booster seat and i have to balance stance with safety!

[ghetto3]

Once the lower control arms are no longer flat, then you're hampering your roll centre.

DANG that was about 40mm ago, will roll centre adjusters help, without my own personal suspension guru and hours of track time r&d?

[rodhog]

As Rupe Noted Anything where your lower control arms are going negative - or the outside pointing up on 90% of standard roads cars - all you are doing is making it a show car a ricer or something Just for looks.
Even with other changes major or not for a Road driven car it will never be as good on a road as any other car with more travel. 80% of the time it will be slower and grip worse then stock standard.

[DavoAust]

I'm guessing you're lusting after hellaflush?

70mm clearance is wayyy too long for a BA. I don't even think they make roll center adjustors for the BA, nor would I want to be that guinea pig

[ghetto3]

70mm was measured from under gearbox mount (crossmember?) To ground, on testing ridiculous low setting. Please dont think i ride at that height! I'll verge on the side of function over form any day hence my orig. Question. I'm keen to tune suspension for optimum performance and there seems to be a standard recipe that most follow, ive got ingredients, just need cooking instructions!

[Rupewrecht]

Theoretically you'd need some ball joint extenders to get the arms back to horizontal, with the BA (i think).

I think mine's been that low for most of it's life - i just modify other stuff to compensate for the ****ty roll centre!

[project.r.racing]

yup 110mm ground clearance (measured from the jack lift points) is where you'll have roll centre issues, as both the front control arm and rear latteral links start facing the wrong direction at this height.

[rodhog]

Also do remember there is the ADR rule of 100mm ground clearance minimal and that is one National rule. Hurting a few specialist importers with cars from the UK.

as for roll centre - the BA already has one of the best desgined Roll centres for a FWD car.

it's chassis was desgined only for FWD from ground up. In comparrison to most of it's previous and replacment floor pans.

but if you haven't already wack a stiffer rear bar on the back. lowering won't help much even then you can't go past eibachs. they ain't very low over stock just the best one can buy.

[ghetto3]

yup 110mm ground clearance (measured from the jack lift points) is where you'll have roll centre issues, as both the front control arm and rear latteral links start facing the wrong direction at this height.

Im curious, in your skid vids your car sits pretty nice. I have same coilovers and similar 15x7 195/50 wheels, what height settings did u have dialled?

[project.r.racing]

in the skid vids, it depends on which one you are looking at.
some was dans JIC coilovers, some was D2 coilovers.
some are running 90mm or 100mm ground clearance (w/ 18s fitted).
some are running 215/35R18 tyres or 205/50R15 tyres.

there is a height difference between the 2 wheel/tyre combos as the tyres have different rolling diameters. the smaller 15" combo is 21mm smaller in diameter, so it will alter the ground clearance by lowering it 10.5mm.

so yes i was being a little cague using using 110mm as a reference point. too many factors go into it. not just ride height.

just set the height of the vehicle has horizental/flat control arms and latteral links

you illegal 195/50R15s have a rolling diameter of 576mm, so your ride height will be lower again. personally i'd be looking at puting the correct tyres first on your car for safety than worrying about you roll centre.

[ghetto3]

A 55/195 or 50/205 would be legal then? What is widest tyre you can fit on a 7" rim +35 offset? I know info is elsewhere but telstra is compromising my search ability (or rather my credit is).

[Clean_Cookie]

There's a good tyre comparison site in the stickies.

[project.r.racing]

on a 15x7 +35 rim, a 205/50R15 tyre will be you easiest and cheapest option.