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Please offer any insights or solutions to my challenge with getting Injector Dynamics ID1050 injectors working properly in my car.
In order to convert my car to run E85, I installed ID1050-XDS injectors and a flex fuel sensor to allow ~210 RWHP of Rotrex supercharged power. Unfortunately, I was never able to get the car to run properly - the engine would start to miss at around 4k RPM. The engine would start and idle fine, and would free-rev easily to above this threshold, however when street-tuning and on the dyno, the car would miss severely at part or full throttle when accelerating through ~4k RPM. Switching back to the old injectors (RX8 yellow top, ~420 cc/min), and old tune, allows the car to run well and it worked great at a recent track event. I do want to install higher flow injectors since the yellow-tops are operating at ~90% duty at the top end.
Car general setup = 1993 chassis with a 2000 1.8l engine, Rotrex C15-60 supercharger, Megasquirt PnP3 9093, Toyota COP ignition
I consulted with technicians at ID and DIY Autotune. The ID tech confirmed the ECU settings were correct, and the DIY Autotune tech suspected a rich mis-fire and suggested fueling changes, but none of this helped. We tried manually smoothing the fuel VE table scaling down the TPSDot values, adjusting req fuel values, etc. etc. Many days were spent trying different fuel settings to no avail. I also switched out coils, cam sensor and spark plugs - this made the idle smoother, but there was still the mid-range mis-fire. On a few occasions I was able to "push through" the mid-range problem and the engine then ran smoothly from around 5k RPM to redline.
The .msq and datalog files from when the ID1050s were installed are attached.
I suspect that I missed something in ECU setup, but neither myself nor my friend can figure this one out. Thank you for helping us work to a solution!
TPS Dot is triggering a lot of AE when you don't need it, thus your pulse width is all over the place.
See the fuel enrichment jumping up to 20+% with very little actual TPS movement? I would pull AE way back until this is sorted.
For some reason, also, your Ethanol % measurement moves from 11 to 20+ % in that short log. I don't know what all you have tied to the ethanol %, but it could be an issue.
Your VE table is perhaps the worst I've ever seen.
Isn't there supposed to be dual VE and Spark tables, that blend according to the Ethanol %? I don't see table 2's or any kind of blend curve.... out of my area of expertise.
How are you possibly running 24* of advance at 4k RPM and 150 kPa... Because with Rotrex, you never hit that cell?
Thank you for your thoughts.
When the ID injectors are reinstalled, I will disable AE and see if that helps.
The ethanol percentages indicated in Tuner Studio are around 71-72%, so I'm not sure why readings of 11-20% are being logged.
I've heard that my VE table is the worst ever seen, and "wack" in the other thread my friend posted in ECU tuning. How should I de-wackify the table? I've been using auto tune after entering in approximate values and have not yet bothered smoothing out the cells not hit during engine operations. If there is a better way, I'll do it.
My understanding is that the ECU is automatically enrichening and adding spark advance to each cell based on the ethanol percentage by using some type of percent adder algorithm. The alternative approach is table switching/interpolating. If one method is better than the other, I'll go that way, but it was my understanding that they both produce good results.
Autotune will run a filter when it detects an AE event and not correct. You can scale the TPS dot considered full scale to inhibit AE at large throttle angles, you can also add digital filtering to the TPS signal if there is noise triggering TPS.
You should be transitioning from "easy" to "hard" in the autotuner fairly quickly. Manual smoothing while in "easy" is fine, once you get to hard you shouldn't be doing any manual adjustments of the fuel table.
Edit-and for flex applications I have had the best results using the linear modifier in combination with a VE table blend.
05-17-2021, 03:25 PM
2 Weeks of Injector Hell
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