Thanks a bunch, just out of curiousity (spell check??) why 50 instead of 45 in the open loop tables?? Does changing out all the values have any added benefit over just changing them from 2000-4000 in the open loop tables??

thanks once again!

 

Did anyone change the open loop throttle lo and open loop throttle high tables? What do these tables do?

 

Open loop deactivates EGR. EGR conserves more fuel in closed loop at 14,7 than say - 15,1 in open loop - because the exhaust is diluting the 14,7 mix. It also keeps engine temps stable at cruise. Not sure, but possibly another way to meet your fuel conservation objective in closed loop (with EGR) is with the BE enrich/enlean maps. Another thing, the only reason it's set to 14,7 in closed loop is because the cat looses it's ability to oxidize R and CO to CO2 any leaner (funny how the EPA is wasting fuel to keep emmisions in their power)

 

why the big block of 13.5's?

 

I recognize that background in bigrics post - Army or F-15's?

 

C6, I dont entirely agree about the EGR @ 14.7 being more fuel efficient than just running lean. Number one intake air temp is higher and that means less oxygen (as you pointed out) but also less power. Running the car both ways I have found I got 2mpg better running down the highway at 15.4-15.5 than I did EGR and closed loop. Theoretically what you are saying is true, dont get me wrong, but just doesnt seem to work in my case. I have the EGR disabled all the time anyway and I run catless besides.

NJ, I believe they are open loop TPS based, except the only thing I dont understand is the determining factor on what high load/low load is, and if it is TPS what is the 105.6% doing in there. Is it like the speakers that go to 11?

 

i recieved my new wideband yesterday =] im going to be testing the posted tables..hopefully this will work for me as well...

 

im an army guy ....

as far as why the block of 13's.... it is something that was there and i never messed with it. I posted the maps requested and my tune id have to say is as close to flawless as possible. JB is the man ..... solid 11.5 afr's to 11.3 by redline. As far as that part of the tune.... id say the 13's are for the lead in while cruising at that RPM already and then needing to punch it.... other then that, as i said, i just left that part where they were and just adjusted the main load and rpm cells that i see while going WOT

 

Perhaps the EGR operating window is too narrow and it is turning off, it really only operates at about 0 - 10"Hg with throttle voltage below a certain point.

I have a suspicion the EGR parameter can be contolled with the 1D BE TP volt table. I will find out eventually

 

Are you basing these AFR's on a 3rd gear pull or 4th gear pull? I'm referring to the 11.5's and 11.3 until redline figures

 

3rd... 4th starts at 11.5 ish and then is down to about 11.1 by redline.

 

Ah ok, thanks!

 

Tip in transition. This is the part of the thread where someone says well why didnt you leave lean spool turned on and then just shut it off at 3500 or something. Why let it do it when I can and tailor it to exactly what I want. In this case with his car and injector size that equated to 12.5:1. I will have to look at a log to be sure, but 13:1 that lean spool seems to give is just a little too lean for my comfort. Especially when you consider how fast/slow the ECU reacts in comparison to how fast other variables can change.

 

JohnBradley,

I did some logs after making the open loop changes, would you mind taking a look at them and letting me know if all is well? I saw some areas where i hit around 15.8, but nothing higher. I haven't noticed a difference in fuel economy as I haven't driven but 20-30 miles on these settings if that.

 

Remember the numbers that I posted are guidlines and not set in stone. I would adjust them as needed to bring the cruise AFR back down to 15.5 or so. I know a couple of DSM guys that run 16:1 cruising but I dont see a need other than it keeps the EGT's lower.

You can send the logs as I would like to see them, I'll PM my email.