SMART Transient AFR Issue At SMART Threshold
sure my map is in the Socal Dyno folder
this happen almost every time I WOT at the tracks
at first I thought it was the WR turbo
but I sit in another friend's car with WR turbo tuned w/SAFC and he doesn;t have this problem. Please try to resolve it as soon as possible.
this happen almost every time I WOT at the tracks
at first I thought it was the WR turbo
but I sit in another friend's car with WR turbo tuned w/SAFC and he doesn;t have this problem. Please try to resolve it as soon as possible.
Originally Posted by Dustin@Vishnu
Hey guys, This is something we are going to do extensive testing on when lachlan from chiptorque comes out. After looking at the graphs, Shiv and I concluded that it may be a glitch with the turn on. I am going to do a bunch of data gathering in the week to come, and then we will work with lachlan on this when he gets here. I may need your guys' maps to test, so I can try to replicate the issue.
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From: Danville/Blackhawk, California
Originally Posted by wthoevo8
Does this happens to ALL the SMART users or just the people that tune their own cars???
Superman-- What size injectors are you running?
Shiv
I'm running 720cc injector
you flash me for 680 injector and tuned it for 720cc
you flash me for 680 injector and tuned it for 720cc
Originally Posted by shiv@vishnu
I have yet to see it personally and I've tuned more than a few SMART systems in the past few months.
Superman-- What size injectors are you running?
Shiv
Superman-- What size injectors are you running?
Shiv
What RPM are you typically at after an up shift? At 5000 RPM or greater?
The attached figures were generated from an on the roll run performed today. I intentionally started at an RPM / load that would be below the SMART threshold. Notable is that when the load crosses the SMART threshold the Xede's output's trajectory changes.
It is interesting to note that the 41% load point is typically at ~4300 RPM, which is an area in the SMART fuel map that is changing from a lean to rich. Is it possible that the ECU sees this lean to rich trend and basically overshoots?
Do you have any rule of thumb to correlate a SMART fuel correction value to a change in AFR? From other data posted in your forum it almost appeared that a -0.6 correction value is equivalent to an offset in AFR of one. This seems too small.
I tried increasing the SMART fuel corrections on the rich side of the line (e.g. negative values) but as cited this is in the transition region. Basically nothing changed in the resulting AFR results. In fact in the attached plots this is exactly what I did. Thus two things come to mind. My increased correction values are not sufficient, hence my question on the correlation between corrections and AFR changes. Or the ECU is interacting with the map's transition from lean to rich.
The attached figures were generated from an on the roll run performed today. I intentionally started at an RPM / load that would be below the SMART threshold. Notable is that when the load crosses the SMART threshold the Xede's output's trajectory changes.
It is interesting to note that the 41% load point is typically at ~4300 RPM, which is an area in the SMART fuel map that is changing from a lean to rich. Is it possible that the ECU sees this lean to rich trend and basically overshoots?
Do you have any rule of thumb to correlate a SMART fuel correction value to a change in AFR? From other data posted in your forum it almost appeared that a -0.6 correction value is equivalent to an offset in AFR of one. This seems too small.
I tried increasing the SMART fuel corrections on the rich side of the line (e.g. negative values) but as cited this is in the transition region. Basically nothing changed in the resulting AFR results. In fact in the attached plots this is exactly what I did. Thus two things come to mind. My increased correction values are not sufficient, hence my question on the correlation between corrections and AFR changes. Or the ECU is interacting with the map's transition from lean to rich.
Originally Posted by shiv@vishnu
I have yet to see it personally and I've tuned more than a few SMART systems in the past few months.
Shiv
Shiv
