Depends on the color profile you are using. You can type in random combinations of CMYK all day long and when you switch between profiles you'll get something different. When using vector artwork I always try to spot color map to pure black. Rich black is a waste of ink.
Dead on jwright. The profile choice is going to have a greater impact on the black once you throw big enough numbers at it.
If you are applying and output profile, your literal CMYK numbers are going to get converted. So anything more than 60/50/50/100 will be the same as 100/100/100/100 or RGB 0/0/0.
The only way you're going to directly affect the CMYK values that actually print is to not apply the output profile or do a color substitution in your RIP specifically for the black you choose.
Oddly, there comes a point where putting down more ink actually makes the black weaker. Strive for a happy medium to get the darkest black.