Different front and rear track

[Talonmotorsport]

My chassis is 1218mm wide at Br11+12 and standard width at the front. I'm using standard width RS3+6 and standard wishbones. Now I know I'm going to need either bolt-on spacers or some deep dished alloys on the rear so the tyres clear the chassis, but how much difference will it make if the front and rear track are different by 100mm? Should I be making 2 or 4 bolt on spacers?

Spacers are not a good idea as will knock hell out of your wheel bearings..Also if the front of the car is book width and the cockpit is wider the car will look odd in my opinion...any nosecone you buy will look odd as the angles are all wrong.

Why don't you just make the whole chassis wider and adjust you suspension to suit, at least that way you create a "new car" and one that won't look so weird.

All my own opinion but based on playing with these type of cars over the last few years....skinny 7's look better than fat ones

[Talonmotorsport]

I thought about the spacer Vs wheel bearing problem and came to this conclusion, the donner sierra weighs 1100kg (ish) was made to carry 5 people, with 120kg of luggage towing a caravan weighing 1000kg. The roadster will prob weight not much more than 750kg (steel panels and lardy me) and will prob not do more than 3000 miles a year. So if the wheel bearings last 2-3 years so be it.
As for the shape of it looking odd you should see some of the heaps I've taxed over the years. I don't realy care what it looks like to be honest as long as it's road legal ,drives in a straight line and passes an MOT.

So front to rear track being different any body know the answer, will I need more camber and caster?

[AshG]

if you alter the rear track too much without doing the front you will have high speed stability issues, have seen it on a 7 that was jiggled around with. simplest way i can put it is think robin reliant.

[Talonmotorsport]

So what happens when you put 185 tyres on the front and 205's on the rear?

[AshG]

that should not be as detrimental as you are not changing the pivots/geometry of the suspension just the diameter of the wheel.

[tex]

the dax rush i had had huge 255x40x15 tyres on the back and the track was if i remember right about 50mm or more wider EACH SIDE than the front. there was no handling problems with it at all - the only thing that you really have to watch for is remembering you have a wider rear end than the front! reason - your blasting along a country road - in this instant kirkstone pass in the lakes - narrow road - car comes other way - you gotta squeeze over to the left a bit - the front wheels miss the big rocks on the left but does the rear? naaaaa of course not - it can stop the car dead from moving..

so iv heard.. baaaaaah...

[7ishNZ]

Why not make the car with equal front and rear track... perfect time to do it while you are building it..?

[Talonmotorsport]

to late for that the wheels are nearly on. I am using 7j rims which will need 2" spacers as they currently lock solid to sb1 and d11 when bolted on.

[aerosam]

Ford Capri wheels on the front will increase your track width considerably as they have a negative offset.

Easier than making different suspension, and fit straight on the sierra hubs.

I even have a pair you can have for nowt if you want them.