Originally Posted by cij911

Mrfred -- I have a Zeitronix wideband and use it to record my boost, AFRs, etc.

Anyone else ---- ??? Thanks

Originally Posted by nj1266

Here is what I would do if I had your problem:

1. Check for leaks in the exhaust system just to make sure that my AFR readings are correct.
2. Re-calibrate my Bosch O2 sensor. These things tend to give different readings based on age and environmental conditions.
3. Reduce boost to 22-23 psi and see if IDCs go down
4. After reducing boost, pull timing by about 2* in the upper rpm range, from 6K to cutoff.
5. After reducing boost and pulling timing, lean out the AFR some more and your IDC will go down.

Originally Posted by cpoevo

With the mods listed in my sig I am running my 780's at 80% at the highest IDC on 91oct and AFR 10.8

Originally Posted by cij911

Thanks Naj....There are no exhaust leaks and the O2 sensor is spot on....I may just reduce boost a tad...

Originally Posted by nj1266

IMO, you should set the boost @ 22.5 psi. This way it will fluctuate between 22 and 23 with weather changes. That is the way I have mine set. Pull timing a couple of degrees and lean by about 0.2-0.3 AFR. I run conservative timing (no more than 16*) and a solid 11.5-11 AFR. The IDC hits a maximum of 92% @ 7K rpm. The car still put down 312 hp and 299 tq using DLL. Some times less is more

Originally Posted by MalibuJack

It takes time, but the trick is to start really rich, smaller size and leave the latency what is documented for the injectors (use the AEM calculator)

Then, you adjust the scale until your fuel trims at idle are very close to zero..

Then drive the car around for awhile, and see how off the long term fuel trims get after a long drive.. At that point you can adjust the 11v and 14v injector voltage latency settings until overall you get your trims while driving in check.. Then you'll have to adjust idle one more time.

What this will do is it should get your fuel injectors, to read "ROUGHLY" close to what your fuel map looks like by the numbers.. Its not quite right, but it should be similar..

Doing this will give you the best drivability and then you can tune your maps... Just remember to make the maps rich to start before you do too much..

Originally Posted by MalibuJack

Let me add that my car has a stable voltage of 13.7v that doesnt drop more than 3/10ths of a volt at idle, and never has gone over 13.9v ever.. So my latency values are acting more as a scaling modifier.. I need some sort of dead time value that will be affected by RPM, at idle dead time isn't as critical as at higher RPM, so when I get perfect trims at idle, it runs lean at higher RPM, and if I get it where I want at high RPM, the idle is too rich for the trims to compensate..

This is partially the MAF curve I'm working with, but the values themselves are within range and reasonable values for the level of boost I'm currently running.. so its obviously related to dead time (or some compensation)

In reality this isn't an important issue for me.. However I spent some time trying to match the injector scaling so my AFR's are similar to what the arbitrary AFR values in the map show, for me it would make quick adjustments easier. Plus I'd rather have to take fuel away than add fuel to the maps..

Originally Posted by MalibuJack

Well, as far as I know all of the values are needed. I honestly don't know what will happen if you change the axis values like your describing.