VTC angles are written in ECU, OEM CL9 ECU can operate till 25* only. If you install 50 gear it will be moved till 25 only. DC5 type r cams are decent for CL9 Euro, best cams are intake TSX 06+ cam if you don't what to touch valve springs and install "stage 2 cams": http://www.ozhonda.com/forum/showthr...=1#post3689413

I have tuned one Accord CL9 Euro 5AT (Auto) with "stage 2" cams he makes 0-100 km/h in 6.2s with cheap tires ! It can easy do in 6s with better ones.
With OEM camshafts on K24a3 engine you can go to full VTC50 there won't be any P2V (piston to valve contact), when you install aftermarket camshafts clearances must be checked because you can damage engine if over advance VTC !!! If you over rev engine (misshift from 5 to 2 for example) P2V can be even with small OEM cams.