[spyderturbo007]

The 21+ psi I quoted isn't set in stone. I know of one guy that was running 26psi on a rock solid tune and stock headstuds with no problem. Then again, I have seen other people running 20psi that lifted their head. Running with the tune you listed above you should be fine, but you won't know until it's too late.

If you can keep the tune solid, personally, I would push the envelope. I guess I'm only saying that because if I trash the Spyder, I'll just fork over the cash for a new motor. No big deal to me since I have the cash, but the wife might get a little pissed.

Take a look at the airflow at 20psi and then tune it for 22psi and see what the airflow difference turns out to be. If it's negligable, then there isn't any reason to run 2psi more. However, if you do see a nice increase in airflow, I would go ahead and crank down on the MBC.

Checking the airflow will also let you know when you start approaching the limits of your injectors. Make sure you back calculate to the actual airflow and not just what the logger says. Then take a look at the tech article I wrote and see where you fall on the scale.