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Old 01-01-2007, 11:22 AM   #1
Scooby Newbie
Member#: 48939
Join Date: Nov 2003
Location: Lenexa, KS
Default The OL/CL Delay and STX

I've done a lot of searching for information on this, but I haven't found a definitive answer. I'm interested in running in STX with an '04 or '05 WRX, but I'm concerned about the OL/CL delay and possible detonation.

If I understand the problem correctly, the car is slow to provide enough fuel when going to WOT or full boost, right? This causes a lean condition for a short period until fuel "catches up". Assuming that's correct, it seems especially dangerous during autocross runs at low speed with high load, hot ambient temperatures, and many transitions to and from WOT. Is this a problem in the real world? We talk about it a lot, but given that cars aren't blowing up during autocrosses or HPDEs on hot days, I wonder if it's more of a theoretical problem than a real-world one.

I know changing boost maps is not legal for STX, but doesn't correcting this problem only involve changing fuel? So... is correcting the OL/CL delay STX-legal, and what have others in STX done about it?
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Old 01-01-2007, 11:45 AM   #2
Scooby Specialist
Member#: 124263
Join Date: Aug 2006
Chapter/Region: MAIC
Location: Now with DB Super 16g and WI!
2004 WRX Wagon
RomRaider + UTEC Tuned


I run an 04 WRX wagon in STX. Your description of the OL/CL delay is correct for the stock ECU. It is highly recommended that you get some form of engine management. I use the COBB Accessport with the STX map. According to COBB, they alter the fuel and timing while leaving the boost alone. Their map does require some mods though...UP and DP cats need to go bye bye at a minimum.

There are other options for EM. The current trend is self tuning using free software. I highly recommend Unabomber's Engine Management FAQ.

Have fun,


Here is the thread addressing the OL/CL Delay.

Last edited by bucket7788; 01-01-2007 at 11:51 AM. Reason: Posted another link.
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