WDRacing wrote:Damn...I think thats a record for 14 psi. Whats AF's were you running and what octane for those numbers?
Brian
AF was 11.25 VERY conservative. Timing at 14psi was 18 degrees (I am thinking very conservative) Timing is set up for premium fuel (91-93 octane). Knock sensor reads NO KNOCK.
Yesterday while tuning the timing table, we had timing a little more aggressive and were running 93 octane. We had knock registering around 1.2 volts on the AEM EMS. We backed the timing down till there was NONE registering.
Because we are using a manual boost controller and had no idea what might happen to boost when we adjusted it, and to be on the safe side, I put in about 2 gals of race gas (all I could fit in the tank that was nearly filled with 93 octane) and continued dynoing. The race gas was just insurance against anything that might happen. If anything, the race gas is taking power away with our conservative timing numbers.
Once we are finished figuring out how far we are going to go with this car, we will fill it with 91 octane and make sure that it absolutely safe to drive at whatever boost level we decide will live for a while on the street. I think that we are going to let it leave the shop at the 350ish RWHP level for premium fuel.
The great thing about the AEM EMS is the safe guards that you can program in. We will be turning on Knock control which will pull timing and add fuel when ever it sees KS voltage over what ever we determine to be a safe level. We can also have the AEM EMS setup for O2 feedback correction which we can program to add or subtract fuel based on what the wide band O2 sees and what AF ratio we have programmed into the VE table. Normally if we do set it up this way, we will only allow the EMS add fuel. If the WB ever goes bad, we don't want it pulling fuel out. We will also program the EMS to turn the injectors off if boost level that we program in is exceeded. We also set up the EMS to loop log internally any time boost is being made. This is kind of a tattle tale that will allow us to see what is going on when the car is outside our control.