The zip file contains a datalog of the error, with UEGO A/F readings(subtract 1 from the afr to get correct reading), as well as the map contained in the haltech at the time. If you look at the time 3.5 - 3.7, you'll notice the injection times go from around 4 ms, to well over 5 ms. This corresponds to the map point 9/16, or 40 kpa/4000 rpm. Looking at the fuel map in this area you can see the injection time is near 4 ms as it should be. I don't understand why the haltech decides to inject more gas at this point. Throttle is a constant 45%.

This issue happens again in the datalog at times 4.7-4.8.

This only happens at partial throttle acceleration. It is very noticeable in the car. The car is a half bridge port s4 13Bt, with stock s5 turbo, 550 primary 1600 secondary injectors, and stock Intercooler. This was logged using version 8.02 of the DOS e6x software.

 

Going by your fuel map, even though the problem you indicate is at a clean point in the map, they do look too caotic, i would fix the upper part of the fuel maps, the bars shoot all the way up after the 15psi point, or was that a bug on my end?

As far as your problem might go, i am 90% certain that the jump in mS value is due to the throttle pump values being WAY too high, and even though you might think you are holding the throttle at 45%, you are pressing it just enough for the TP to engauge and shoot that extra amount of fuel it is set to. Another cause might be the coolant correction map, i would take a look at that too.

 

I reduced the throttle pump increments greatly, but i haven't had a chance to do much more testing. Its only apparent in fourth gear pulls at partial throttle. Are my sustain values out of whack as well? or is it just the increments?

The bars shooting up is a purposeful measure to drown the engine in fuel if overboost. I know I could have used the overboost fuel cut or something, but this was just a safety measure in tuning since we didnt know how high the boost would creep. My revlimit is 7500 as well.

I didnt think it would be the throttle since the throttle in the datalog is constant 45% and even decaying slowly.

Thanks for the advice,

Nik

 

You do have a point, if the throttle % isnt incrementing at that point, then it must not necesarily be because of that, but, then again, since you have the throttle pump dead band feature activated and set at 2, maybe there is something happening when you step on the throttle ever so slightly. I would lower all the bars on there, ive never seen them so high, and usually most of my cars are street car, but on a rotary with 550/1600 injector i dont go that high, mostly stay between 30-50% tops.

But it is odd, do you feel the little hickup while driving? can you feel a stumble in the power/rpm band when it occurs? Or is the AFR getting of of wack at that point?

 

After lowering all the throttle pump values, it seems you are absolutely right. The car no longer has these rich spots. I guess the haltech datalog just didnt sample small changes in TPS fast enough.