OK guys I just got a new bigger turbo for my Evo IX and I worry about the first tune setup after install my new turbo. I’ve been tuned my Evo since years and now I have 348WHP. My mods are MBC, ported manifold, O2 housing, 3” downpipe with cat back, cat delete, lower intercooler pipe and tephra v5. What I’m looking for is a little advice. I’m planning to go with a bigger injectors, Intercooler and Cams in a few months. *Also I’m thinking to install new head studs and rods bolts but I’m reading more about it. Anyone can tell me about considerations on my first tune after the swap?

 

It will need to be re tuned for turbo /cams and injectors

 

I know that I need a tune for every change doesn't matter the mod. But for now I'm changing only the turbo with my mods before mentioned and what I need yo know if for example I need to down the current boost setting (I'm on 24 tapering to 20), or change the current AFR map and timing or a combination of all or any other setting in order to run on a bigger turbo.

 

You would start off like any other tuning session. Low timing and rich afr. Dial in your boost, then your afr, and then timing last. Start on the looser side of the MBC and work your way up.

 

different turbo different spool characteristics so as above

 

+1 to Reaperx's comments. I did want to mention something on your comment about swapping rod bolts.

Unless you plan to increase your redline, I see no reason to replace your rod bolts. People seem to think going up in power requires higher strength rod bolts, but in reality, the bolts are only affected by inertial loads. So unless u plan to put heavier rods or pistons in there and spin it faster, I would recommend to leave the joint untouched.

 

Thanks for all your comments. X Double Dot I don't have the intention to pass the redline, after read your comment, I did a research and you are right, I don't need to replace the rod bolts. What about the head studs? Since I will running more boost I believe that the head stud should be replaced.