Are there different cam lobes & profiles for VTEC vs. non-VTEC mode on the S2000 engine, or is VTEC just engaging a different set of higher-ratio rocker arms at a certain RPM?

Reason I ask, is that there is only one profile people discuss for 0.050" duration and lift on these cams. That leads me to think it's one set of lobes, and VTEC is simply a higher multiplication of the lobe (via a different rocker arm that engages at an ECU-set and oil-pressure approved RPM point).

If there were two different sets of lobes (one profile for under VTEC RPM range, one for in-VTEC RPM range), we'd see TWO different set of cam timing figures -- maybe 222 degrees @ 0.050" in standard mode and 230 degrees @ 0.050" lift. Figures for comparison are below. I'm giving some thought to keeping my AP1 intake and getting an AP2 exhaust cam for its extra lift which will help my Stage 3 Laskey head and GT3076R.

USDM F20C (S2000

 

Two lobes.

Those figures don't report the non-VTEC lobe since most people don't care.

 

I have an AP1 IN and an AP2 EX on an AP2. Unfortunetly, I don't have a back to back with only that as a delta. Honestly though the AP1 IN is real gainer compared to the AP2, the difference in the EX is so minimal as to be non-important.

 

So do AP1's benefit from AP2's exhaust cams?

 

My opinion is no.

 

i am doing the same on my turbo build.. i will not have back to back info either though

 

Take the valve cover off and look at the cams and rockers its plain as day.

 

Anyone have a dyno plot for the AP2 head with the API intake?