with absolutely no disrespect intended at all, can i give some advise from my over 20 years of modifying and racing belletts...?
Pombellett wrote:We've got a decent negative camber on the front by modifying the top wishbone pick up (we lost 12mm) we also moved it back to give a little more caster.
i gather u mean u moved the pivot pin that holds the top arms into the "bucket" inwards 12mm?
if so, i hope u like ur cars to drive with enormous amounts of bump steer, coz that's what u now have....
trust me on this, i've seen bellett's bump steer with these pivots moved only 6mm.... and once another owner moved his 12mm and then asked me to drive his car to try to work out why it threw itself all over the road afterwards.... which i did and it was horrible.... it all became obvious what was wrong when he told me of this mod.
the reason is simple. moving the top pivot dramaticly changes the inner pin angles, and doing so creates bump steer. belletts seem to suffer from this alot more than some other types of cars too.
a far, far better way of getting the same camber is by shortening the top arms by 12mm. this still moves the top ball joint inwards, but keeps the pin angles correct.
lowering a bellett also helps with neg camber, as standard, the bottom arms run down hill from the inner to the outside, so making them sit "flat" pushes the bottom ball joint outwards, effectively making it longer. also, this gives more front track, which helps too.
also, another MUST DO mod on a modified bellett front end is to re-do the inner sway bar mounts, especially if it has a bigger than standard bar, as the standard mounts really are terrible. this is also probably the easiest mod to do on a bellett front end, but is one of the most effective.
ur mod for more castor is spot on tho, and works well.
PM me for details on both of these mods, as they both involve engineering skills, and it's not appropriate to adverstise them in a wider world, coz if something does go wrong, i don't want a legal case based on "but brett said just do this....." thanks very much.
Pombellett wrote:We plan to drop the diff carrier to help gain negative at the rear and this, we reckon will have the added bonus of straightening the driveshafts.
i'll save u the hassle.... it doesn't work on a bellett.... the prob at the rear is a combination of coils and the transverse leaf when arranged in the standard manner. to gain rear camber is simply a case of lowering it, as it's a swing axle arrangement, and lowering them is very, very simple, using bellett components. the biggest trick here to to make sure u limit the amount of travel the rear has, as excessive travel creates rear steer, due to the bellett design of having angled mounting points on the rear arms. basically, they toe in on bump, and toe out on droop, so limiting the travel dials that element out. this has always been the biggest bug bear of a bellett's handling traits....
again, lowering the rear also flattens out the rear arms, again, giving more track too.
Pombellett wrote:I don't think there's enough dive at the front, so springs are being softened. And the rear, well, it all depends if we can go LSD, as if we can we can keep the rear pretty stiff.
my advice is here is to keep the front a bit stiff, as less dive helps maintain camber angles thru the travel. also, having the rear too stiff severely hampers drive out of corners, as the car can't "squat" under power, and even with an LSD, it will still spin inside rear wheels. trust me, been there, done that, that's why my race car now uses a locked diff too.
as i wrote at the beginning, please take no offence to my comments, as they are intended to save u alot of hassle (and also, heartache if all went wrong, as bellett are known to "tip over"....) by being constructive from using the knowledge i've gained from my years of racing them.
i'm sure we all know that every kind of car has it's own little quirks, and the bellett is the same, so doing what may work as an improvement on another car might not work on a bellett, and i'd hate to see all the fantastic work you guys have put into the car be wasted when i could advise of what i've learnt instead of trying to "re-invent the wheel" so to speak.
cheers, and please PM me for detailed info on what my race car has done to it, as i'm only too happy to help out.
brett.
Yeh got told by a few I was seen lookin under the backend of the odd Bellett at Coona,even got caught on film,can asure you that problem is under control,and it was'nt the drugs 
you deserved it as it was a huge punt. I am glad it paid off.