Nistune Forums

Hi.
I have an r33 skyline. Was looking at rebuilding a rb30 with the rb25 head and fitting that in.
How well Would it run with the stock ecu etc.
Cheers

It will most likely start and run, but I've found with more capacity the engine needs a substantial amount more enrichment in places where it previously did not. most common changes are the load maps and cold run fuelling areas.