A baro sensor will be needed. Long ago, SpoolinUp worked out an SD harness that plugs into the MAF plug and included not only a GM IAT plug but also a plug to use a stock 1-bar MAP sensor as a baro sensor. No one ever wanted it, so it was taken off the SpoolinUp site.

 

I think I remember reading somewhere that the Baro value was set so that a value was taken from the map sensor before then engine fully started and that value was locked in.

So with this new SD patch, we would just log kpa and 1byteload and fill in the map. So basically we would be bypassing all the VE calcs on maf, as well as the setting of the KPA/LOAD 1D table on the current SD roms?

With the current Patch, we have control over the KPA to load transition and also the VE which affects fueling,
So with the new proposed patch we will only have control over kpa to load but with alot more precision so that once tuned in the fueling should be spot on with the maf tune correct?

 

Afaik the baro code never worked. Donner said this when he ported the patch to 8858 he omitted that port.


A running baro measurment has benefits by the sounds of it.

I understand that currently ve effects load aswell

 

So this will be an easier way of what I already do to get boost to more or less mimic load as a PSI value, i.e 200 = 20.0psi.

 

90zcrex - yes, with the MAF still installed and still plugged into the ECU, log rpm, kPa, and MAF master load, and then copy the MAF master load values into the 3D SD table. Get as many values as you want, and then interpolate the rest. After that, remove the MAF, enable SD, and the resulting SD master load and AFRs should be very close to what you had on MAF. I suspect that some additional tuning will be needed after the MAF is removed because of the potential for improved intake air flow.

Let's save the baro discussion for another thread, but suffice to say here that I would not be using baro at startup and instead using a continuously monitored baro value. Its simple to do as long as there is a sensor plugged into the original baro circuit. Just need to get SpoolinUp to start making his SD harness with a Mitsu MAP sensor plug that is wired into the baro circuit.

 

I plan on having two 3D SD tables that are the same thing except that one has kPa on the axis and the other has psi instead. That will be one less thing for you to fiddle with.

 

Sweet sounds good, I'm here for testing whenever its ready, I still have my stock map sensor and should have everything at work to wire it in.

 

I'm so in, just seems like the next evolution .

Did I read it right that it will be one rom that you enable a sd function in? The same rom can do maf or sd?

 

Hmm I just have the spoolinup GM IAT that plugs into MAF plug. Is this going to be a problem? what do people do now with no baro signal when running MAFless using fuel temp for IAT? Cant we continue in the same way?

 

This looks good, it will help more people realize that fueling should be tuned with the MAF compensation/smoothing table (like you said it´s like a VE adjustment). Many people currently try to adjust fueling by changing the 3D VE table and that table should only be used to reach the loads that where seen with the MAF, not for fuel adjustments.

Having a 3D table filled with load values rather than VE will make it obvious that if you change the load values in that table you´re afecting both fueling and timing, not just fueling.

 

We need an authentic baro signal to make this work as intended. You will have to add it. If you want to continue like we are, we can keep using the old sd roms. To me the addition of this is nothing but improvement.

I would rather buy the appropriate harness from spoolin up if it makes it proper.

Although it would take the production of the said harness for most to make this jump.

Currently we don't have a baro signal on sd

 

Create the harness is not a problem, the issue is build the code..

Mrfed can you do this?
Harness is very simple!

 

sub'd

Thank you mrfred for continuing the development of SD!

Aside from having the 2 tables (kpa-load has always been 1:1 for me) and having a real baro input; what other benefits will this bring? Just an easier, more straight forward tuning process? Or are we talking about better end results?

 

I never understood the point of ve adjustment until this thread: to line up load. I always read that's what the kpa load table was for even though I knew ve effects load lol

 

Me too. My reference to kpa-load being 1:1 in my previous post was about the kpa-load table.

It wasnt until this post, that I think it clicked and I said..."Is this why my logged Kpa and load dont always match up? Should they?"


I had been using the MAF Smoothing table as a last resort to bring AFR back while keeping a "normal" curve in fuel, ve, and maf smoothing maps.

Now Im considering redo-ing the whole thing to make kpa match load, then just adjust fueling with the MAF smoothing.