dadasracecar
Member
So I did the coil spring stretch and I wanted to see if it fixed the winter fuel cut. I thought I would datalog a couple of WOT runs with the IAT set to 82 deg and then take the IAT clamp off and repeat to see the difference and datalog a fuel cut if it was present. The ambient temp was 46 deg which should produce a fuel cut most of the time on my car. Short story is that no fuel cut happened so the coil spring does play some sort of role, crazy as that is. This morning however, it was 37 and I was routinely fuel cutting in 6th at 3600 rpm. The fuel cuts seem to be less severe and less jerky but they're still there. Spark blowout? The weirdest thing about the fuel cut is that you can dial it with the IAT clamp. So while the spring stretch mitigates it, it does not remove it. So there is still work to be done.
Anyway, the point to this thread... So I did three runs at WOT in 4th. The afr is almost identical. This is expected as the car has a MAP IAT that is most likely used for air density calculations. The interesting thing is the throttle behavior. The tps is all over the place in both but it opens about 25% more with the IAT clamp! Look at the axes. The IAT clamped runs are near 80% while the stock IAT barely hits 60%. Here are the logs.
IAT=82run1
IAT=82run2
stock IATrun1
Anyway, the point to this thread... So I did three runs at WOT in 4th. The afr is almost identical. This is expected as the car has a MAP IAT that is most likely used for air density calculations. The interesting thing is the throttle behavior. The tps is all over the place in both but it opens about 25% more with the IAT clamp! Look at the axes. The IAT clamped runs are near 80% while the stock IAT barely hits 60%. Here are the logs.
IAT=82run1
IAT=82run2
stock IATrun1
