Quote:
Originally Posted by stevo585
I wonder how my tunes cam timing is... I believe we took my NA tune and adjusted for the ESC. I know my AFR is 11.8 and timing 22.5 degrees max load & redline on 93 gas. (12.2 and 28 degrees on e85). I'm not speed density since the stock MAP was able to read the boost pretty well and the MAF was in a normal voltage range. I saw a max of .33 bar @ 45F. 
Just wondering if the cam timing is too aggressive on overlap. Wouldn't some boost go out the exhaust then? |
The best way to solve the cam timing is to start with smoothed Intake and Exhaust tables. Then increase the valve overlap by moving the column contents one column to the left. Keep doing this one column at a time until power decreases, then back off till you reach best power. I've found a spacing of 3-1 for Intake and 2-1 for Exhaust works best for me.
Best power is a delicate balance between containing the expansion to extract max torque, and yet allowing the exhaust to exit without impeding flow. Power can be lost through impeding the flow, and also by releasing the charge before max torque has been extracted. Take a look at the spacing between columns and rows. I experimented a bit before settling on the spacing you see above. I'll be starting with the same tables when I start tuning for E85.