Still looking for the elusive...

[killerbee]

way to limit spoolup smoke on performance tuning, and maintain equivalence ratio. This has been discussed in other threads. Starting a new one (just for you tony) to see if there has been any progress.

The paradigm entrapped need not reply.

[bballer182]

The paradigm entrapped need not reply.

hmmm....


Well if thats me you are talking about i wont tell you about the CALC PID ive been working on that calculates EQ ratio for just this very situation. I've on a quest to remove excess boost where it's not needed and remove fuel where boost can't be produced efficiently.

It's taken days to get this thing sorted out. I was naive enough to base my instant MPG pid on straight MM3 values a long time ago and since then have realized that is grossly incorrect, however, it wasn't that far off. It is now based on the injector flow rate and the proportional relationship to the square of the current FRP.

I adapted the NEW calculation to readout EQ ratio and have not had a chance to get some logging done for this, as i have been playing with DSP too much.

But if this is not me you would be talking about i would be willing to talk to you privately about this, if you would like.

As for the software development of this EQ tuning...
Ross's brain has been consumed with the DSP stuff and is trying to make the LMM deadline before SEMA.

[GMC-2002-Dmax]

way to limit spoolup smoke on performance tuning, and maintain equivalence ratio. This has been discussed in other threads. Starting a new one (just for you tony) to see if there has been any progress.

The paradigm entrapped need not reply.

I admire your persistence, its called MAF Limiting.............

Your goals are much different than mine, I understand that there is not a 100% fix for everything and I accept it, there are always tradeoffs and simple physics dictates that you always give a little to get a little.

Tony

[killerbee]

Yes MAF limiting. So far, elusive with Bosch.

There is rpm fuel limiting...seems to be limited in effectiveness and tradeoffs may be high.

[killerbee]

hmmm....


Well if thats me you are talking about i wont tell you about the CALC PID ive been working on that calculates EQ ratio for just this very situation.

We can have this discussion off-line if you like. Here is the one I have used before, not mine, IIRC fingers may have been involved, it is several years old. Credit where credit is due.

As you point out FRP is key to assessing actual dosing, and does vary with the square of pressure.

"({GM.MAINBPW}+{GM.PILOTBPW})*sqrt({GM.FRPACT} )/({CALC.CYLAIR}*16115)"

If you have anything to share in this regard, feel free. PM is fine also.

[bballer182]

We can have this discussion off-line if you like. Here is the one I have used before, not mine, IIRC fingers may have been involved, it is several years old. Credit where credit is due.

As you point out FRP is key to assessing actual dosing, and does vary with the square of pressure.

"({GM.MAINBPW}+{GM.PILOTBPW})*sqrt({GM.FRPACT} )/({CALC.CYLAIR}*16115)"

If you have anything to share in this regard, feel free. PM is fine also.

I'm having a heck of a time trying to get the EQ ratio figured out. I've used that equation too and currently have a version of it with the NEW calcs based on advertised injector flow rates. Question is; what does the "*16115" represent?

[killerbee]

a number of conversion constants. I have never set out to create one from scratch, however any one that uses mass of air, and mass of fuel, with some logic, is good enough for me. I don't look for perfection with this, just a useful comparator in logs.

Still, it is hardly useful, if void of any programming tool that allows you to balance air and fuel.

Or is there another way?

[bballer182]

a number of conversion constants. I have never set out to create one from scratch, however any one that uses mass of air, and mass of fuel, with some logic, is good enough for me. I don't look for perfection with this, just a useful comparator in logs.

Still, it is hardly useful, if void of any programming tool that allows you to balance air and fuel.

Or is there another way?

That equation converted to Bocsh pids created wild and non-logical values.

I'll PM you with the calcs i have come up with

[Racehemi]

I have used Fingers equation to help me tune my LLY for couple years now. I believe that he fudged the 16115 number until he could see a light haze coming out of the pipe at WOT. Because the LBZ injectors have a different flow rate you will need to tweak the 16115 number to suit the LBZ injectors. IMO, the easiest and by far the fastest means to accomplish this is to install a wide band oxygen sensor into the front pipe and start comparing meassured EQ to calculated values and tweak accordingly. Be sure to filter out the calc.cylair values once the MAF has been saturated or maxed out or your results will be skewed. Obviously you will need to substitute LBZ PIDs for the following LLY PIDs before you begin. Let me know if I can be of any assistance, I used this method on an LB7 with 40 over injectors with some success.

"({GM.MAINBPW}+{GM.PILOTBPW})*sqrt({GM.FRPACT} )/({CALC.CYLAIR}*16115)"

That equation converted to Bocsh pids created wild and non-logical values.

I'll PM you with the calcs i have come up with

[killerbee]

you will need to tweak the 16115 number to suit the LBZ injectors.

I agree. One vehicle specific constant. Should be easy to solve for a new one.

What did you see for eq when running highway unloaded, no boost? I seem to remember around 1.0??? Or was it 0.6?