I’ve heard this from more than one person. You don’t want to polish out the sanding scratches to a mirror shine because having those tiny imperfections cause turbulence in the intake, which leads to better atomization.
@@alexsegura9012 I seem to be having overboost issues with a stock k04 after doing this, and catless DP. Something tells me the 2.3 flows better now lol. It hits over 20psi when I really mat the pedal and it’s in a low RPM high load. Good or bad issue either way you look at it haha
It’s a set of butterfly valves in the intake manifold, used for cold starts and running the engine lean for a faster warmup. There may be other uses of vtcs but, not too sure.
plug the rod holes, and don't smooth the runners to much and careful with egr bump
Good advice!
Why shouldn’t you smooth the runners too much ?
I’ve heard this from more than one person. You don’t want to polish out the sanding scratches to a mirror shine because having those tiny imperfections cause turbulence in the intake, which leads to better atomization.
@@nya.garage awesome, thank god I came across this before I finished the job. Any idea if there are actual power gains from this ?
@@alexsegura9012 I seem to be having overboost issues with a stock k04 after doing this, and catless DP. Something tells me the 2.3 flows better now lol. It hits over 20psi when I really mat the pedal and it’s in a low RPM high load. Good or bad issue either way you look at it haha
You patching the VTCS rod holes?
I am now, haha
@@nya.garage not needed FYI... I have dyno proven 10hp with 3 psi less on a stock cars.
@@quickspeed6 I ended up not patching the rod holes
Whats vtcs
It’s a set of butterfly valves in the intake manifold, used for cold starts and running the engine lean for a faster warmup. There may be other uses of vtcs but, not too sure.