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If I'm out driving around, and find myself seeing a lean spot on an AFR gauge...can I tune a bit rich in that area, while the car is on? Or will it shut down, or something?
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Just the last couple of days I've been playing with the atmospheric pressure sensor or ATP settings. You know, that slider where you can change the altitude by dragging the slider one way or the other to increase of decrease the altitude. When I move it to say 2500 ft at idle, I can watch my AFR's on the wideband change from 13 afr to 14 or so at idle.
That ATP sensor is in my mind a little more active than explained in the instructions. I think it can make a pretty large change in afr's by increasing the altitude.
Or you can be at idle and play with the bars for fuel. Change the fuel on the bar to the left at different psi at idle and you'll see the afr's go up/down and you can kill your idle if you get too rich/lean. I'm talking the bar to the left and moving it in -4, -2, 0, 2psi and so on and at each psi move the bar up/down as desired.
Quick answer to your question is: Yes, you can change fuel while the engine is running.
Yes, all changes can be made with the car running. Obviously we don't recomend making changes while driving..
I'm not sure the instructions say anything about how much the A/F will change with altitude. The idea is to set it to your altitude and leave it.
At about 16000 ft, the atmospheric pressure is about half of what it is at sea level, so you can reasonable expect if you slide the slider to 8k feet (half of 16k), you are cutting fuel by (very roughly) 25% as compared to sea level.
I'm probably somewhat wriong in my assumptions, but it seems to me if you slid that slider over to a higher altitude, you would automatically change the fuel over the full range of the engine more or less evenly. Just a thought. I'm sure someone might blow an engine playing around like that and boosting all creation, but I like messing around with that slider and have two new rotor housings that need a home.
And while I'm here, I wonder when the non turbo version, S4 is coming out? This summer I thought. I've a 86 n/a I'm on the verge of putting a turbo intake etc on, BUT if a RTEK2.5 came out for the non turbo cars, I MIGHT buy one of those instead.
If you were rich everywhere and under every driving condition, then yes theoretically you could use it to lean out the mixture. Personally I wouldn't recomend it... if you have an area that's rich, you can lean it out witht he correction map. The thing is you know what you changed so you can watch it for going too lean. Leaning *everything* means you have to monitor everything to make sure it's not too lean. Just a greater chance of not seeing a lean spot.
Linear Mode
