tuning fuel trims

[talonkev]

I have a 92 tsi, with 780 injectors, and an keydiver chip, and an SAFC1. I have been trying to tune it for awhile and I thought the problem was my hacked 1g mas. So I just went to the 2g mas. I reset the ecu and raised my fuel trims up to +30% across the low throttle trims. My low throttle trigger is set at 30%. The low throttle trim stayed at 100% the whole time I took a 5 minute drive, then when I stopped it dropped to 81.2% and stayed there forever. So then I reset the ecu again and made some adjustments on the afc, and after about 10 minutes of slow driving the low throttle trim bounced around but stayed within 5% or 100%. My low fuel trims were set at +19% accross the board. It stayed in that range until I parked the car and let it turbo time, within about 10 seconds the fuel trim dropped to 81.2 again. So should I set the fuel trim for 1000rpm alot lower to keep it from dropping. Im just afraid to lean it out to far on idle. Thanks, Kevin

 

[Staytuned]

You need to lean it out more to bring it back up to 100% or the computer will always fight to get it back there. Hence the 81%, the computer is trying to get you back to it's 100%. Worst case scenario you go too lean and the computer adds some fuel and you now have readings of 100+%......do you see what I mean?