Sjd6795
Proven Member
- 614
- 121
- May 14, 2014
-
Wilsonville,
Oregon
Going to be swapping from my 450cc to 680cc injectors today and I am curious on the latency values. Do I just add to my current values the recommended amount for the 680cc?
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https://www.dsmtuners.com/threads/98-99-ecu-tuning-problems.399187/
Post #6 Ceddy himself gives the exact values you should use for PTE 680s.
I will give this a try and see what happens thanks. Question on adjusting the table is there anywhere in the log to monitor to know which area to change? Or do I just increase/decrease the entire table by 1% or so until things look better?Try increasing the values in the Async Accel Multiplier vs TPS Delta table.
Watch the wideband gauge on throttle tip-in, or review a log where you make a single sharp stab into the throttle and hold it wide open for at least a few seconds. If the AFR goes lean you need more tip-in enrichment; aim for 12.5:1 AFR or slightly richer between 2500-4000 rpm. Asynchronous Multiplier means a percentage of pulsewidth added to each injection event and TPS Delta is how fast you're depressing the go pedal.
Personally I'd would be graphing with your WBO2 & AFRMap scaled the same along with MAF hz
When the hesitation happens you should be able to notice it in the graph right away
Note the MAFhz the hesitation, probably lean, is happening and add airflow with MAF smoothing at that point
I would work on getting the MAF calibrated to the best of your ability before tweaking too many other things
Cruising is easy to adjust and WOT is easy to adjust
The transient area in the middle of the MAF curve where you usually start coming into boost and MAF hz rises quickly, it will take a bit more time to get it spot on since it's a relatively quick passing moment but getting it correct means your WBO2 will track AFRMap with a great deal of accuracy
When you get the curve right you will see that your WBO2 swings very nice, cleanly & accurately to the AFRMap setting
From the moment your got WOT, if you're graphing WBO2 over AFRMap, you should see your WBO2 track the AFRMap very well
EDIT: Here is a screen shot of a quick pull to give you an idea of what your WB02 and AFRMap should be track, its from an older post I made, easier for me to find the old post than the actual SS picture I made
https://www.dsmtuners.com/threads/small-16g-with-evo-8-fuel-pump.521224/#post-153712344
I wish I lived in Florida I'd pay you to help me. You sound like you have a lot of knowledge with this. I can confirm that during the hesitation where things get choppy for a few seconds my AFR does go lean one point it showed --- and another time it went to 16.6 but it's only for a brief second then everything is fine. I took three logs and going to look over them in a bit.In a nutshell no it's not going to be calibrated, if it was that simple nobody would be tuning anything running a stock MAF, plug in injector data and call it a day done but it's not that simple
It'll run sure with the correct injector data only but odds are the fueling is going to be off
To get the proper fueling the ecu needs to know the injector size and have a relatively accurate estimation of airflow in the cylinder
You calibrate the MAF so that when the ecu commands say 11.1 AFR the actual measured/deliver AFR results in 11.1 AFR or any other AFR commanded by the ecu
Calibrating ensures the ecu is getting the proper data to make as accurate a calculation for fueling as possible
Entering the injector data is more or less part of the base setup, the MAF will needed to be dialed in