After making a few runs and having the odd stumble, I tried adding about 3x the integer delay at all air flows and rpms (747'). Well now the motor runs smoother than ever! No near stalls under hard decel, and no bogs. Idles down nicley. I'm still playing around alittle with AE though.

So with these new bigger delays, the int will still save me if I get some bad gas or something, but it is pretty much disabled. I don't recomend doing this unless your fuel tables are near perfect.

Just my thoughts after 5 test runs, anyone else had luck with getting rid of the int term???

 

I have actually found something similar. I was using a mathematical equation to tune and discovered that it was a PITA to keep doing it that way. Eventually, the mathematical method will hit on the right ballpark VE number, but you have to actually fiddle around with the number by-hand until you get the AFRs right. I did it today and I understand exactly what you mean about the INT. I have been using it all day as a pointer to tell me which way to move the VE in my 8746 stuff. Worked like a dream! Mine idles pretty good too and I got rid of the off-idle and mid-range flat spots too. There is still a little exhaust pop (like a faint bass drum) that I can hear in the upper end stuff (3800rpm and up) but it isn't nearly as bad as it was before today. It used to have a rhythm to it, now it happens sporadically.

 

Hey Low,

The problem might be that your truck is really brown underneath all that silver paint.

Hey, I'm in Switzerland now, "working" whats your email??

 

Which exact locations are you talking about?.
Kewl, something new!.

 

Have headers and moved the O2 sensor further downstream? Not unusual at all. I'd also reduce the proportional gains and see how it is.

Then once the tuning is close(r), reduce the INT delays until the response comes back without any of the problems.

Still need the INT to move for the BLMs to update.

RBob.

 

Yes, but as long as I still get x-counts I'm happy. And I don't really know why, but the IAC controls work really well now.


The table was "int delay vs airflow", It must be something with my high injector flow rate or something, but the int was really causing drivabilty problems.

And yes I have greatly reduced prop gains, about 80% less than stock, gives me a nice O2 swing.

 

Hey CanadianBreast, its the same as before ryanhart@shaw.ca

 

Will be heading in a somewhat similiar way after a very long chat with rbob last week :-)

Unfortunately i got my exhaust fixed(all day 85+ deg sun) and getting it selaed properly did cause quite a change in my low end VE tables and especially the idle regions... Did make a lower end surge i have off idle and lite cruise range much more pronounced in the 12-1400 rpm area or so.

Once the Ve tables are back in line im cutting back the proportional gains to see if slowing them down causes my car to quit jumping rich/lean as quickly and hopefully isolating the surge(theoretically speaking at this point)

thanks for all the neat stuff getting thrown around here :-)
Jeremy

 

Not to change the subject...but exactly how much of a difference did the exhaust sealing make in your low end stuff? I found a little pinhole leak around the O2 sensor bung that I welded in a few weeks ago. It isn't all that big, maybe 1/16", but it is big enough that I can hear it...that's what made me look for it.
I ask this because I just got my low and mid stuff tuned REALLY nicely and I'd really hate to have to go and start all over because of a little pinhole leak by my O2 sensor.