This is a comparison between the cut broadcast on American TV networks (e. g. Cartoon Network or USwpix) and the uncut Japanese Version.

While other countries have not yet aired Dragonball Kai, the series was already broadcasted a few times in the USA.
In comparison to Dragonball Z you can immediately see that Dragonball Kai was obviously toned down in a few scenes:

Dragonball Z	Dragonball Kai

Additionally, many violent sequences were not even altered for Dragonball Kai, but cut out in the first place. Thus, you will hardly see any close-up shots of Tenchinhan after Nappa cut half of his left arm off. Also, you do not see Freezer's beam going through Vegeta's chest. Even the well known sequence in which Freezer massacres Kuririn is much more harmless than in Dragonball Z.


Getting ready for US-TV:
The series was censored in order to be bradcasted on US TV. The censoring reminds one of Naruto's US Version. Sometimes there are cuts which are very noticeable due to a crack in the music, while at other times they used a few tricks, e.g. by retouching things or using alternative material. Sometimes they even altered or postponed soundtracks or sound effects in order to make the cuts less noticeable.


The overall difference in time amounts to 1 minute and 54 seconds.
(The rest of the difference in time results from differently long intros.)

0:15
Cell elbows Goku in the face.
0.5 sec

4:37
Extended shot of Cell swinging at Goku.
1 sec

5:08
In the US Version, the single frame that shows the actual hit has been replaced by an entirely white screen (1 frame= 0.04 seconds).
no difference

5:10
Cell screams in pain.
1.5 sec

5:13
Missing hit. The US Version is back in the game when Goku falls backwards.
0.5 sec

6:07
Mr. Satan's assistant notices Cell and Goku fighting in the air and says "Up there!". The reporter looks up.
(If her cleavage was the reason why it got cut?)
7.5 sec

7:21
The double hit at the end of the shot is missing.
0.5 sec

11:46
The fight is shorter.
3 sec

11:49
Ditto.
1.5 sec

11:55
The hit is shorter. The US Version only shows Cell falling backwards.
0.5 sec

13:29
Kamehame-Ha shreads Cell's body to pieces.
2.5 sec

15:05
In the Uncut Version, the camera pans to Cell's torso.
3 sec

15:12
Cell's remains again.
3.5 sec

16:49
Ditto.
5 sec

17:01
Ditto.
1.5 sec

18:46
Cell hits Goku in the face.
0.5 sec

18:49
A huge part of the fight is missing. In between, there are shots of Z people.
70.5 sec

20:04
Another missing hit.
1 sec

20:32
Ditto.
0,5 sec

21:06
In the US Version, the single frame that shows the actual hit has been replaced by an entirely white screen (1 frame= 0.04 seconds).
no difference