Thread: Optimal VVL kick-over point

I run a SR20VE with N1 cams.
I notice a dip on the dynograph when VVL kicks in around 5500 to 6000 rpm. After 6100 rpm it pulls like it should all the way to 8200 rpm

I'm going to install a Greddy MSS and want the intake to be set at around 5800 rpm and exhaust to 6000 rpm.

Do you guys reckon this would be a good starting point?

This is a good way to find the optimal points for both cams: http://www.sr20-forum.com/341375-post65.html

You can use the HP curve instead of the torque curve if you want. It should result in the same thing I think.

Ok, very clear

Without a dyno, I don't know how you'd tune both cams separately, but if you switch them both at the same time the poor man's way to do it is to start low and move the switch point up until you "feel" the switch as little as possible.

Ususally if you're getting a substantial dip in the graph you should move the switching point(s) higher in rpm.

Did you do base pulls or were tuning on the dyno? We found my car to make the best power along with smoothest curve at 5,600. Tuning is key!

Dyno tuning. But not having enough equipment onboard to do so properly.
But I DO know cams are coming in a bit too early.

One thing I remember we found with my car when tuning, spark plug wire issues. I had an old set of wires and my car had a dip like you described. My boy ended up switching them with another set and the dip smoothed out as well as the rest of the graph. You don't happen to have a print out of the dyno, do you?

Interesting....

5200 is a good baseline to start