I just got my engine back together and the only tune affecting change I did was change my HKS cams (272's?) to GSC S2's. Wondering how necessary it is to get a retune? When the car was running the tune was dead on and when I took it apart I found a vacuum leak (fp solenoid was venting open) so the vacuum leaks will be fixed thus making it a hair richer and maybe even help with the additional air from the bigger cams?

I won't be getting into much boost if any at all because I put in a new clutch and want to break it in first and I do have a wideband to see how much the afr will be affected but just want to get some comments on this, I'm new with boosted imports so not sure if anything else gets affected I need to know about.
Thanks

 

Definitely get a new tune but I'm sure you will be fine for now. I did the same thing by swapping out hks cams to the GSC s2's and my af stayed around the same. I have picked up some knock recently but I believe its from a bad batch of e85. Once the weather warms up I'll be going for a retune.

 

I would get it retune.. I'm kind of like you, new to the boosted Turbo..

Good luck ,