Kingtal0n

On 93 octane at max boost (18-20psi) sr20det stock head w/ cam upgrade, 9:1 compression
STREET CARS / DAILY DRIVERS
Always Keep IAT less than 105*F (GOOD Intercooler)
Check for boost leaks!

From 350-450rwhp timing (top max power row) Is like this:

3000rpm = 7*
4000rpm = 8*
5000rpm = 9*
6000rpm = 10*
7000rpm = 12* if torque is falling (typical) otherwise use 11*

Never use more than 13* and keep the low rpm stuff below 10* after 15psi+
*note these value can also be used for 2jz-gte engines w/ cam upgrade and similar boost

Spooling into the turbo from 0-5psi should be nearly N/A timing values, around 18-22* Similarly distributed
Simply interpolate top to bottom i.e. 18* to 7* for 3000rpm column, 19* to 8* for 4000rpm column, etc...
tip: Try not to use the same timing value side by side at wide open throttle for any engine

Cruise timing is around 32 to 34* sometimes 36* never more than 37+ for cruise sr20det
Typical 240sx w/ sr20det should easily 30mpg highway at 65-70MPH
I Was able to get 33mpg using 9:1 compression w/ lightweight drivetrain parts (flywheel & wheels light = superior cruise economy)
To dial in cruise timing, Fill gas tank 100% full at specific pump, reset ODO, then drive the car using cruise control steady speed like 65MPH for 100-200 miles using a specific timing value (say, 32*)
Drive back to SAME Pump, fill tank EXACTLY as before, calculate mileage (miles drove / gallons used according to pump)

Now, repeat the test using exact same roads, same exact speed, and return to same pump but this time use different timing value (this time, 35*)
Your mileage will increase 1 or 2 or 3MPG everytime you add a couple degrees of timing for the cruise. Stop adding timing when mileage stop increasing.
*Keep aware as the vehicle weight increases, ideal cruise timing also changes. For example if your car today 3000lbs you find 36* gives best MPG. Tomorrow if you add 300lbs to the vehicle, new timing ideal value maybe 34* and 36 would be too much timing, may cause long-term durability issues, excess wear and tear due to high pressure spikes can occur when combustion temperature increases such as after a hard run when the engine returns to cruise. Therefore, always use the least-best cruise timing and anticipate additional weight/load in the future.