XRAY - Model racing cars

I still measure at the same point. So at the outside front corner of the front arms and outside rear corner on the rear arms. So exactly as is shown on the setup sheets.

The key here is how far the car will move up from rest before the tyres lose contact (socalled uptravel). If the circumstances remain the same and I change the anti-dive/anti-squat settings I would set the downstops so that the uptravel remains the same as before.

For instance if I set the front downstop at 5mm with the standard (middle-middle) pivot holder positions and then set anti-dive by changing the front pivot holders to the -0.75 ones then I would go to a downstop setting of about 4mm (the pivot hole is about 1mm lower in the -0.75 pivot holder).

Hope this makes sense.

Yet another reason why measuring droop is better than measuring downstops ;>

It's easiest to think of in terms of weight transfer. Droop is a rather confusing term. Suspension up travel more clearly explains it. It sounds like you've got the idea but you've got a couple other people in your ear confusing things. Generally be careful listening to someone who will tell you what setting to run as opposed to explaining it to you.

Higher down stop measurement = lower droop measurement = less suspension up travel = less weight transfered to the opposite end of the car.

Lower down stop measurement = higher droop measurement = more suspension up travel = more weight transfered to the opposite end of the car.

For example lets say you have a down stop measurement of 5 mm and that gave you a droop measurement of 1 mm above ride height. If you then changed your down stop measurement to 4 mm that would give you a droop measurement of 2 mm.

Yes, if your running foams forget entirely about the down stop measurement. Down stop, ride height and tire diameter are all relative to one another so when one changes the others need adjusting. Also forget the the idea that you have do run 1 mm more or less on one end of the car than the other. Adjust and test for your self to see how the setting effects the handling

All this being said I do see quite a few foam setups with 0.5-1.0 mm more droop in the rear than the front. Again though, it's not a rule. Hope that helps.