Originally Posted by captain stacker
is it possible to check tweak on a car with 4 mini digital scales?
im trying to get out of buying a tweak station
is there a good article that explains tweak?
Tweak will tell you if the all the wheels are on the same plane. Your chassis might be twisted or your ride height adjustments might be off from wheel to wheel.
Scales will tell what each wheel weighs. That will give you an idea of how the car balances left to right and fore and aft. For road racing, 50/50 side to side is preferred. Front to back is usually close to 50/50 but each chassis design seems to like a particular weight distribution where it's happy. That may not be 50/50.
I use both. I tweak the car flat, then put it on scales to get the individual wheel weights. I have an iPhone app called "Cross Weight" that calculates all the percentages automatically. It's very handy.
I use four digital scales with a 500g capacity each. They are accurate to the 1/10th of a gram, which is probably too accurate. Scales like this will cost you $10 to $30 each, so they are not cheaper than a tweak station.
A touring car will have individual wheel weights in the 300g-ish region and things like shock stiction and suspension bind make it difficult to get the weights perfect.
The scales also have to be perfectly level to each other in order to get an accurate reading. I never use scales at the track. It takes a long time to set them up right, so I reserve them for the shop.
Scales are very useful for an oval car, since a tweak station won't give you much info on cross weights.
Bottom line -- a tweak station is a good investment. Scales are nice to have if you like to spend a lot of time getting every last bit of info about your car's setup.