Sea Level vs Altitude Tuning

soutthpaw · #1 Wed, April 29th, 2009, 02:16 PM

here is a table I Just made that compares the Offset at altitude compared to sea level of the stock map as a way to look at different patterns.. I may put these values on a map just to see what it looks like in 3D

The highest advance group is at high RPM in the low to mid throttle range Based on the fact that there is a low mass fuel desired value (found in low torque demand situation).. which would most likely be found at high crusing speed... thus more advance under low load and best fuel efficency
oh the 55/2200 value is a typo, its supposed to be 9 not 90 heh

soutthpaw · #2 Wed, April 29th, 2009, 05:53 PM

Ok, got out for a test drive this afternoon... the up down shifting issue is gone on both the tune Cody sent me and the one I made. both r are good except both and I even noticed it a bit in the 80HP tune what the the on mild acceleration the Torque Converter is a bit too firm when it locks. still tugs a bit when it locks in 3RD gear ONLY.... so need to figure out how to soften that one lockup then will be good to go.

The other tranny tune I did locking in all gears turned out to require a lot more pedal to move the vehicle than the other 2 tunes that i test ran so I think I would have to change the RPM to Mass Fuel Desired level and maybe the inferred pedal position to get it to work right... also the 1-2 and 2-3 were pretty harsh so need to soften those too... do i lengthen the lockup time or the slip time? it i want the converter to be locked as soon as it upshifts? ill try that later

***cleatus12r*** · #3 Wed, April 29th, 2009, 07:06 PM

I'm glad you got it figured out.

If you're still having issues with the firm TC lockup, look at the torque table in the RPM range in which it's giving you fits. I didn't mess with that map at anything above 2000 RPM if I recall...and it's pretty close to stock there along with the Lockup DC%.

soutthpaw · #4 Wed, April 29th, 2009, 09:05 PM

Edit: I answered my own question regarding Pedal position and it didn't work just gave me DTC for low throttle position etc

***cleatus12r*** · #5 Thu, April 30th, 2009, 01:27 PM

You have a PM, DJ.

soutthpaw · #6 Fri, May 1st, 2009, 12:00 AM

Ok spent some more time looking at the various Timing maps for The different tunes... The stock tim ing map seems to be a lot more complicated than the ones Bill is using in his tunes... I am guessing there was some software engineer at Ford that had nothing better to do.... My guess is they were running the engine on an Dyno and tuning the Timing and other factors to get the lowest emissions vs power output???

Anyway the one thing that stood out is that a lot of the stock timing curves seem to drop around peak torque and then rise again then taper off at high RPM after peak HP... Is there a reason for the drop around the 1600 RPM range as I am wondering if I need to preserve that in doing the altitude timing?

Also should the Advance come on later the same or earlier with the higher altitude?

Am I asking too many Questions???

soutthpaw · #7 Sun, May 3rd, 2009, 01:59 PM

Well I got a chance to play a bit an made changes to the Altitude maps for each tune's injection timing... seemed to work good so did some more tweaking with the maps and just loaded another set to run and see how they work...
the I got the Fuel Sipper Tune working real well with the modified shift points and using the stock TC lockup map etc... nice and smooth... Didn't get to agressive with the timinng for now.... Kinda want to wait on Bill's thoughts as I am sure you have done a fair amount of High Altitude tuning....
Need to test where I get excessive smoke before changing the Low boost fuel... took it down slightly on the 100hp just to see what happens