Spud":1abf69ga said:
Chris! Hey there buddy. Long time no see. I'm researching engine management recently and have been looking in to the SMT-7 a lot over an EMS......anyway. Question about whats going on in your screen shots. You only rev up to a little over 3k, but I'm obviously guessing that you're only partial throttle since your AFR gets 14.9 at the richest. Is there a way to tell how much throttle you're giving it?
I'm guessing that "Load deflection" % has something to do with it, but I'm not sure what that is.....
btw, how come you haven't played with tuning it at all yet? Thanks a lot buddy
Hey Ian!
Those screen captures were actually just me revving it in my driveway a bit. But yeah, if you watch the playback you can see the A/F cycling back and forth like it would normally doat idle/partial throttle. I have both a wide band and a narrow band o2 sensor doing the real monitoring for me though, so I should have a good handle on things.. I suppose I *could* output the signal from my wide band to the smt6, but I dont really need to.
The "Load deflection %" is basically the % of 5 volts that your AFM is seeing. For example, a value of 50% would mean the AFM is at 2.5 Volts. Ours read backwards, so a smaller percentage means that the AFM is more open and closer to 0V.
You can also use one of the wires (smt7 may have more than 1?) to input whatever voltage you want into the unit. So you could use the throttle position wire, boost, or whatever. I have mine set up to watch the MAP sensor so that I can compare the MAP to the AFM signal.
Ahh tuning...just keep running into one thing after another actually. At first I was waiting on my wideband to arrive which took a lot longer than expected. Then I was busy with school, graduating and all and got too busy to work on the car. Now I just got that installed but I'm having some electrical interference from my car which is really annoying. It appears that my power windows, once up or down but still receiving power for those few seconds, is distorting something which in turn messes with the signal to the SMT6. I haven't been able to filter it out yet but I am still trying. As soon as I can get that done I plan to do tuning for sure. I REALLY want to get moving on the map conversion, trust me!
Here is something cool for you to check out from a Mazda board. They use something called an MPI tuner, which is identical to the SMT6 with some very slight changes to be compatible with their vehicles. If you look at the screen captures, you can check out what the map conversion process looks like. With the SMT7 this process is done automatically.
http://www.msprotege.com/forum/showthread.php?t=96397
Here's a capture of me going WOT but only revving to probably 4000rpm. It shows the AFM going wide open there as soon as I hit the throttle basically.
Here are some caps I just stole from one of my logs just for you to take a look at. The thing called "Amp input V" is my MAP sensor voltage.