EFI Cam Change
• The base maps I’ve seen tend to have the cam change really low in the RPMs (if sufficient load is present). This bit of advice is verging on tuning recommendations, which I don’t want to get much into, but I think the 4,200-4,800 Cam lift change is too low. For most, I think the low lift cam still pulls OK into the 5,000+ rpm range. I’ve selected 5,300 and it will take an act of Congress for me to change it again
. Reason for that is that the fuel map has to change if the cam lift switch point is changed, and that’s not a task to be taken lightly since it involves dyno time to be done correctly
• Other important notes about cam lift and phasing.
o All cam variables are found in the VANOS tab. Much of this tab is dead for our cars (even if it looks like you can change stuff, most of it doesn’t apply).
oPhase: To change when the *intake* cam phases (retards/advances), you open the Constants in the VANOS tab. You can control both the RPM and the TPS parameters that effect this phase in the constants that address “intake”. In most cases, leave this alone on the base map, as this intake phasing on the base map is generally fine. Note: There is no way to adjust exhaust phasing, as it’s fixed in 2ZZ. If you change to the "bigger" cams, you may be able to clean up a lopy idle with this function... From what I've read, there's not a lot of power to be found in the phasing change of the intake cam on the stock cam... So again, leave it be on the base map unless you know otherwise...
oLift: This is the fun part. To change when the cams goes to high lift (both exhaust and intake cams switch lift together), you use the constants marked “exhaust”. You can adjust the TPS and RPMs required for the lift switch to take place. This is where I selected 5,300 in part due to torque curves and in part due to the rpms I pull around the sweepers at my track, as I don’t want lift changing much (or at all) at the track. The TPS adjustment changes the basic load that needs to be on the system before the switch takes place. This should be between 40 and 55 degrees for most folks. Try 45 and see how you like it. You may like more or less…
o In Review, the titles for the constants in this tab do not perfectly match what their functions actually are (this is the only place in the software that this happens), so take a look at the software and then read this again if that helps. The intake parameters impact phasing and the exhaust parameters impact lift (on the intake and exhaust cams together)…
Best,
Phil