Wasn't sure which thread to put this in, but this one is near the top and the subject line fits, soooo.....
I did some more testing this morning and made some observations that might be useful for others in their testing.
(or I might just be crazy...or both

)
All testing was done with daytona2.zip and the following settings in the service menu:
Country: USA
Cabinet Type: Twin
Motor Power: 100%
normal car, automatic transmission, beginner track
I thought ffb was working as it should at first, but I was only side swiping cars on the straightaways. When the wheel was turned it seemed more random.
When I thought the feedback effect for cars hitting me was missing, the centering effect was pushing in the opposite direction as I was being hit from (hit from the inside on a left hand turn when centering ffb is already turning the wheel clockwise).
So I decided to turn off the centering effect to see if it made a difference, but apparently DirectInputSelfCenterMax has no effect in daytona2.
Here are some notes about how the ffb settings affect the game (I set each to 200 while having all the others set to zero during each test):
DirectInputConstForceMax : affects the strength of the resistance effect when up against a wall or other cars.
also controls the centering effect. DirectInputFrictionMax : Has no effect in daytona2 that I could tell.
DirectInputSelfCenterMax : Has no effect in daytona2. Centering force is controlled by DirectInputConstForceMax DirectInputVibrateMax : affects the strength of the vibration feedback effect on grass and against the wall (makes wheel shake, but won't make it pull in any direction)
The things in red, I found odd.
Could it be that the ffb effect for getting hit by other cars is being masked by the centering feedback that's already present since they're both working off the same input?
(I had default centering turned off in the logitech software btw)
I played around with scuda and DirectInputSelfCenterMax does control the centering feedback on it and works like you would expect.
(DirectInputConstForceMax needs to be cranked way up on scud race, like the 200-400 range)