From all the dyno chart that ever posted on this board,
I can see a big transition of torque near the vtech changeover rpm
(5850) that I had stated before.
The dyno charts don't lie and different cars dyno test at different temp,
air pressure and oil temp but they all shows the same characteristic.

 

I engage at 5600 rpms. And heres one for ya. If you guys with a V-AFC have it tuned properly, you won't feel VTEC switch at all. Also, What happened to 6100 rpms? I thought 6100 was stock. In part throttle applications mine kicks at 6100 rpms. Thats not by the stock tach either, thats from the V-AFC.

 

6k

 

For the 5850 numer dyno graph people... did you ever think that 5850 is the number where HP and torque cross? After all, HP is a mathmatically derived function of torque, with 5850 being the "magic number." It's not actually HP that you are measuring, it's torque, and the HP is derived from there.

But for the record, when I had my S, VTEC engaged at 6500.

 

[QUOTE]Originally posted by Ldogdotcom
[B]For the 5850 number dyno graph people... did you ever think that 5850 is the number where HP and torque cross? After all, HP is a mathematically derived function of torque, with 5850 being the "magic number." It's not actually HP that you are measuring, it's torque, and the HP is derived from there.

 

[QUOTE]Originally posted by Ldogdotcom
[B]For the 5850 numer dyno graph people... did you ever think that 5850 is the number where HP and torque cross? After all, HP is a mathmatically derived function of torque, with 5850 being the "magic number." It's not actually HP that you are measuring, it's torque, and the HP is derived from there.

 

OK, so the usuall VTEC engagement point it 5850rpms. That is when the VTEC switches from Mid to Secondary (WILD) cam. I know the S2K has 3 cam lobes for each pair of valves. Primary, Mid, and secondary. When does VTEC switch from Primary to Mid? Anyone know??

 

Great link Cyber Logic, just when I thought there was nothing else to know about the S2K, there's a little bit more to it.... However, I'd like to point out that parts of that link you gave us contradict what you said:

[QUOTE]
LOW-AND MEDIUM-SPEED OPERATION
In the S2000 VTEC engine, each intake and exhaust valve uses two different cam-lobe profiles: one for low engine speeds and a second for high engine speeds. From idle to around 6000 rpm, the two intake and exhaust valve cam followers at each cylinder are actuated by low-rpm cam lobes. Their short duration and low lift ensures good cylinder-filling at low engine speeds.

 

I guess all of us that have the 6k engagement would be noticably faster than the 6.5k engagement..

 

[QUOTE]Originally posted by SteveUCI
[B]

I'm not "guessing" with any room for error when I say that I noticed VTEC was delayed til a sky-high 6600 when I was between 8-9000 feet in AZ.