actually i take that back, that other XDF has the VE table looking more like a VE table, but it's backwards or something!?
actually i take that back, that other XDF has the VE table looking more like a VE table, but it's backwards or something!?
man oh man that assembly is so complete and the code is so primitive, it's actually readable. this is going to be a cakewalk!
Years ago I discovered the same thing with $99.Originally Posted by steveo
ok this disassembly lists the VE table @ 0x278. both XDF files list it at 0x278B.
disassembly lists the table as 30-110 map, both xdfs are 20-100 map
no matter which way i look at it, AMYB's VE table looks very strange.
never mind, dumb moment, forgot the three bytes at the top. 0x28b is right, but like i said neither looks right somehow....
It's because it is built properly in the XDF in the $4D thread. Most of the one's we are used to looking at have RPM and MAP swapped. You can swap them and it will look correct.
If you open $42 you'll see it has two Main Fuel VE1 tables, one is the one we are all used to and the other is corrected... read the notes... but corrected one would not work with what everyone had already built as spreadsheets. Numbers in each cell are correct, just the shape of VE table your used to working with is different, RPM and MAP are backwards..
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
i see my mistake. the xdf i was working on was set to row order instead of column so it was gimpy, switching that fixed 'er up. yes the one in that thread is correct.
the VE curve looked backwards as far as VE looked like it was dropping as RPM increased....... but then i forgot that there's a VE multiplier table. once that is applied it looks a bit more like engine VE.
theres lots of cool stuff in that disassembly, but not finding much useful thats missing from the xdf.
my dumb question of the day.
HW mode? wuzzat
highway.
highway fuel or highway spark
1995 Chevrolet Monte Carlo LS 3100 + 4T60E
good progress on xdf cleanup, put some hours into it, categorization and renaming to 'human readable' is mostly done, now for some comments and documentation (which should take a while since i dont know what half the stuff does yet), then the research into new stuff starts
version 1.0 attached! not completely finished but it's a good start
as usual with my stuff view in --category view-- or it'll look like crap.
lots more, comments cleanup on important stuff, added more from that dissasembly (anything i'm unsure of the code or how to interpret, labeled experimental).. error checking ae de etc etc.
im up in the air about even adding stuff like error checking thresholds, there's quite a bit, but since this thing barely sets a code no matter what you do anyway.... might not spend the time.
finally managed to insert a new chip into this thing, and i think i got it first try. (famous last words, right?)
i'm pretty happy with this anyway. i think my tuning skills are getting better, especially considering:
- first attempt at tuning TBI ever
- first VE i've ever done with a 'restricted from the factory' type engine
- low log diversity since this is a short distance car in a small town
- it took me 20+ tries to get VE right on my LT1
the big difference is that driveability is 1000x better. before it would die with gentle starts, you had to roast the clutch to get it moving. with a bit of added VE and pump shot in that transition, it barely needs throttle to get going. there used to be heavy surging at around 70-80kpa 2200-4000rpm in PE mode, that's gone too.
i did this with cheapass $40 ebay chinese chip burner. mark burned me these bins and mailed them to me, but apparently stuff gets from china to canada faster than USPS from the states does! crazy stuff. still looking forward to having backup copies so thanks again for doing that for me, mark
thanks again for all teh great info on this site, and all your advice that made it possible.
having the VE tables displayed with the 2d VE adder incorporated helped a lot. without that extra input, the ve table just looks warped and it's impossible to smooth or get a handle on transitions. more XDFs should try that. until i did it, i was really scratching my head...
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