VDC and Slip light = less power?

msr1

Hello.. this is my first post in the forum, ive got a 10' 370z 7at and it just rockssss.

Well i have tried to find an answer for my question and could find it, so maybe someone here can help me out...

From a couple of weeks ago ive been experiencing that everytime i shift into 4th gear, the VDC and slip light turn on. I didnt pay to much attention to it ..until i was hanging with some friends (e46 m3 & 650i) and we decided to make some runs.

With the m3 i was 1/2 car in front of him all the way.. and when i shifted into 4th.. he passed me and putted 2 cars lenght on me inmediatly, we did several runs and it was the same result always. If we continued accelerating maybe it could be more, 3-5 cars i assume.

I experienced something very similar with the 650 as well, everytime i changed to 4th, he would pass me with a big power difference.

Trying to find conclusions i thought that maybe the car closes a little the tb, or retards timing. idk. If someone has experienced this and fixed it, i would be happy to know.