F:R weight bias and corner weights

[h100vw]

I mustn't drive hard enough, I never feel the back end letting go.

[rgvlee]

I mustn't drive hard enough, I never feel the back end letting go.

With your reported fuel consumption and tyre longevity, I suspect this is 100% the case

[h100vw]

With your reported fuel consumption and tyre longevity, I suspect this is 100% the case

Steady on Lee, 730km on this tank and it only just went to 0km to empty. I reckon if I was brave, it would do 800.

Calculated off the MFA and injector size, it's under 6.5l/100.

I do hang it hard around the roundabouts and on ramps. Where having the back out would end up in bodywork required.

Gavin

[Martin]

When looking at corner weights it's the sum of the diagonals that really matters
As per the ComputerScales, your diagonal is 50.6% - would not waste any time on it
You have a 15 kg variance, it's normal for production cars to have a 50kg variance

Josh at MCA suspension does not bother corner weighting his time attack car

I found the numbers. Can you remember if thats the before or after numbers? Did they play with preloads or corner weights to adjust for that front cross discrepancy?

[sambb]

Oh yeah I know that 50% is basically perfect isn't it. Still it's be interesting to see what it'd be with driver weight in it. From (poor) memory I thought it had been worse than that and I was worried my bar issue might be taking it even further. Anyone selling whiteline adjustable droplinks??

[Martin]

Just thinking, with normal struts you could use front bar preload to correct the left front to right front discrepancy couldn't you? Or at least you could statically/in ride but I'm not sure what would happen during a corner/in roll. any thoughts

Getting the bar bent anything close to 16kg is going to be frustrating - a lot of trial and error
With this method the bar will try to lean the car - not idea
At the end of the day it's a fudge that is likely to have negative and unanticipated consequences

[sambb]

I've no idea if a bar preload could correct 16kg. Would be nice if it could. No idea if it would result in a smaller or bigger ride height change than the usual collar adjustment causes either. I've never had or seen a car get corner weighted in the flesh - I've just read that once corner weighting is done the regular way with ride height/spring preload on the collars, usually the ARB's are then reconnected. They can then be preloaded to even up any new discrepancies created when each of the two sides of likely varied height are co-joined again - so it obviously can be done that way to a point. If you say that 15kg is so small as to not to be worried about then maybe that discrepancy is so small that that's exactly what a bar preload could sort. why not have a crack?
I'm really not fussed about the above anyway. All I know is that my FARB is definitely preloaded to some extent. It may not even be an issue but its easily remedied so I'll have a rummage through the rose joint and threaded bar box tomorrow and will be able to get it back to neutral no problem. But hey if its the only avenue open to me (since I have struts) and if I ever do get around to chucking it on some scales, out of curiosity I think I wouldn't mind finding out what effect a bar tweak would have especially since I'll have the adjustment.

[Martin]

I've never had or seen a car get corner weighted in the flesh - I've just read that once corner weighting is done the regular way with ride height/spring preload on the collars, usually the ARB's are then reconnected. They can then be preloaded to even up any new discrepancies created when each of the two sides of likely varied height are co-joined again - so it obviously can be done that way to a point.

I've never heard of the sway bar being pre-loaded like this and there should be absolutely no need to do this
When you connect the sway bar - it's done with zero influence - the sway only comes into play when the car leans
Preloading the sway bar will be the same as trying to lean the car - not something we want

[seangti]

yeah I agree with what martin is saying, never heard of preloading a sway bar, perhaps on an oval track perhaps... A swaybar by it's design should not be loaded when in a static state. By preloading, you're effectively increasing the spring rate on one side and decreasing the other due to the lever motion. That would make the cars handling less consistent on direction changes.

A 16kg variation across the axle represents a 4% variance between the two, it's really sweet f'all IMO and I think pretty darn close. Ideally, it'd be on the left front so with driver it's a bit more neutral, but that's some effort involved for diminished returns.

[Stuwey]

I had mine corner weighted to within 5kg - made a huge difference, you could feel the difference 20kg added to the LH front made. Roundabouts were a whole new game.

My motorkhana mini is within 2kg with driver!

Weights should always be done with the driver in the car - I did mine with 3/4 tank of fuel too.

Don't have any pics sorry.