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Old 01-05-2005, 02:31 PM   #1
Scooby Specialist
Member#: 61006
Join Date: May 2004
Location: Hong Kong
Default UTEC tunning tips needed

utec tunning tips needed, how to tune the "chokes" on the ECU and UTEC cross over point during low load area.

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Old 01-05-2005, 03:26 PM   #2
Scooby Guru
Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
2003 GGA MBP
12.9 / 105+


smooth the transitions. take lots of logs of the crossover. make changes to the low load areas of your maps so that your timing does not jump much when the utec takes control.

with the sti utec and no w/b you cannot look at afrs unfortunately, so only half the story. but a start nonetheless.

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Old 01-06-2005, 12:39 AM   #3
Citizen Mick
Member#: 27646
Join Date: Oct 2002
Chapter/Region: NWIC
Location: Portland, Oregon
2003 Sleeved 2.5
Oil Dry Sump Goodness


Log the timing transitions and look at the injector duty cycle at the same time. Match them and the transition will be invisable. If you are running a stock intake then use ECU timing below 40% load column. The timing transition from 40% to 50% will be more consitant than from 0% to 10%. Then you just have to monitor what the fueling is doing. Monitor it going in and out of UTEC control. Once the UTEC is in control you can do whatever you like.
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Old 01-06-2005, 01:40 PM   #4
Scooby Specialist
Member#: 33370
Join Date: Feb 2003
Location: Milwaukee, WI
2002 Impreza WRX
Blue now w/ 6 fun flavors


fueling for me made the biggest changes in the hesitation.. I would start my car at 1.5K in 5th and do a pull to about 40% load then start at 2K and on up to starting about 3.5K... after each pull I'd adjust fueling to try to keep the AFR transition smooth.. this got rid of about 95% of the crossover issues.
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