when we change the camshafts, is it obligatorily necessary to change the Valve Springs?
let us must change Adjustable Cam Gears or it is already well regulated ?
I want to make economic and reliable.
Thanks

 

It depends on how aggressive the cams are. For Type-R spec cams, you can usually get away with stock springs. Don't forget though, weak springs cause valve float, and valve float can easily destroy the engine.

Cam gears are nice, but far from required.

 

thank you, I will buy camshafts of ITR, after, I will change the springs because I have a ECU 4800/9000.

 

I hope you don't actually plan to rev to 9k.

 

What do you think of INNER STIFFER VALVE SPRINGS to add to my springs? Is less expensive than news specials springs (88$ per 16)
Thank
JP
PS: in this moment it goes up easily to 8800

 

9k is fine on a Stock Type-R Valvetrain as long as he changes to that. Not sure I'd try it on an SI setup

 

itr cams wont make power that high so revving to there is pointless

 

:werd:

but I would recomend at least ITR valve springs

 

ITR cams will make power to about 8200 and the drop off is so slight it is worth going to 8900-9000 to drop back in at a higher rpm in the power band. Plus it keeps from needing to shift at some auto-xs