RomRaider

ok i think i found my issue, its gotta be the injector latency. i rechecked it on the DW site and noticed i was using offset values. so i read around and found some dw850 side feed values. i entered those and the car idled even richer and even a ve of 10 did nothing to help. so im going to have to come up with my own latencys. BUT to get car to idle at a good afr, it seems to want a pw lower than the 1.3ms minimum i entered per the DW site.

so now i just need to learn what the ecu does with that minimum pw table, and how latency effects idle. the dead time is super sensitive on this motor. when i set the idle latency to around .5ms, it leaned out bad and started misfiring. then at .58ms it is idling around 12.4 but at around 1.3, so i think im being ignored. i either has to set min pw lower thelan 1.3 or target a richer idle and higher rpm. hopefully with straight e85 i can get it closer to a 800rpm 14afr idle before dipping below 1.3ms

i just dont get how i got the car to idle on my emanage at a perfect 14.7 with now fuel correction and at the stock 700rpm on these same injectors

yes, you can decrease min pulse width. don't forget we have low pw comps to help re-linearize the flow rates.

also, you should be doing ALL your first pass VE, scalar, latency, mafv curve, etc tuning in open loop only. trust me, it's a far faster way to converge the tune.

darn. i been in closed loop. ill force open loop again.

i just dropped the pw min to 1.0 and set the latency back to dw spec battery offsets and its idling around 16 with correction in the teens and a raw pw at 1.1ms, so i reflashed and added 10% to latencys and get a 13.4 afr, a flat 1.0 pw and -20 correction. wtf.

i know it wants to be at 1.2ms to idle on target, i just cant seem to work the tables to get it there

i so miss live tuning. flashing aint bad but i bet my neighbors are sick of hearing my car start over and over and over....

latest attached, not flashed yet

Ok i think i'm finally getting the hang of parts of it.

I dropped the min pulse to .8ms and was able to find latency's that got my idle and light load around 14:1 in open loop. So i'm pretty sure i'm close enough to start fine tuning the AFR's with the VE table

Warm up was lean so I'll have to revisit those table after i get the operating temp dialed in. This is all on e34. hopefully it wont cahnge much with a fresh tank of e85

ok. tinkerred with VE table and got it all dialed in. well had it, as manifold heat soaked it started idling richer and richer and eventually down to 13.8, so i need to start looking at iat adjustments

i left iat table alone, figured that was science, so adjustments were better made elsewhere. After lookig somemore i saw the VE table was only scalled down to 5psi, after warm up i was idling down around 4.2ish, so i rescaled it to 4 and seems to have helped.

I turned closed loop back on, correction stays under 3 and learning is at -0.78. I went for a little drive and it felt great and stayed on target, thne after a few minutes i started getting a lot of exhaust smoke. This turbo must be dead too. My VF43 was dead, and hot side was caked in oil, I through this td04 on just to get it running but it had pretty good shaft play and apparently leaks. Either that or i'm burning off some old stuff in the exhaust. Its been a driveway idle queen for about a week now

lst night i swapped out clutches. Going to send my Southbend back for a rebuild. I also rebuilt and reinstalled the VF43. smoke is gone.

BUT i could use some help on warmup enrichment. I dont understand the values in the MIn Primary Base Enrichment tables. The car is currently on e34 and about 1/8th tank. Hoping tonight after work to drive it up to sheetz for a fresh tank of e85. I assume i want to blend the enrichment maps but could use some direction.

drove to work today. Cars running excellent.

just a couple bugs to work out.

- Warmup still lean. Try enricment table with no eefect
- Warmup starting to idle hunt, hints out then catches itself rich. thinking need a better timing cup.
- I get a little backfire on light loads if i let up off throttle quickly
- open loop is a tad richer than target but until i get my better clutch reinstalled, i cant reach areas higher than 8 psi consistantly

I put my southbend clutch back in today and decided to try and log boost and see what afr correction looked like. But now im more concerned with the timing. 35deg at peak torque then tapering off just doesnt make sense to me. i visioned around 20° at peak tq and up towards 30 by redline. I havent really mess with the timing yet. just used the default group n i assume for e85, and then subtracted a few degrees for the 93 octane map

sorry for typos, my keyboards missing a lot of keys.

peep my iats, its 80 degrees out, full humidity. perrin fmic ftw

last log and updated rom attached

I tuned a friend's car with DW740s and it was great. Then one of the injectors had the cap come off and float around in the injector port and things were not great. I'd check out your sidefeeds for new gaskets and whether the caps are still in place.

my 850s are in decent shape. i couldnt take the group n map anymore, just dont trust it so i made a regular map. I know some others said they run it with no knock but 36 degrees in boost at 4k rpm seems high, might not knock on e85 but its gotta be past mbt

I also found the stall restart maps i never adjusted. i stalled it the other night backing into driveway and couldnt get it to restart right away. hopefully this fixes it.

and just reflashed my timing. again.

this time used the s203 base map as my 93 octane map and then used excel to add that base map and the advance max map and pasted that combo in as my e85 map

what kind of compression did the motor end up with? The timing is hard because you don't have very many other maps to look at that are similar. Maybe start with a usdm timing map and build up instead of down.

You probably want a map that shares heads if possible. The combustion chamber has a huge effect on timing. Jdm heads are worlds apart from anything in the states so they are apples to oranges.

The carberry rom is a good rom but it figures total timing different among other things. You just need to make sure you understand the differences between oem roms and carberry roms.

The warm up tables are s***. No one explains any of it very well. I have found that min warm up is probably in effect the entire time it's in warm up. Table two is in effect for say 50% of the warm up and table three is the like the very beginning.

Table 1 is 100% of the warm up
Table 2 is the first 50%
Table 3 is the first 15%.

So once you start your car basically all three are adding fuel and then table 3 falls off and only table 1 & 2 are then adding fuel. And somewhere table 2 falls off and only table one is left adding fuel. Table 2 & 3 have more than one table that it somehow selects which it starts. One is usually after stall and one is full cold start. That's what I've found. Adjusting is not very easy or fast

I'm calculating 8.4-8.5:1 compression. they are 05 USDM wrx heads on a beefed up 22e block and the thicker 9856pt ej22t gaskets. Still need to look into what i should change since the thicker gaskets advance my cams 1 degree.

I'm familiar with how carberry base timing is basically total timing unless theres knock, then it drops. I'm using the RPMxPsi table rather than the RPMxg/rev. I have the CEL knock light enabled and set to a low -1.09 trigger. I've seen the CEl flash here and there but usually just in low load areas like up a hill in the wrong gear etc..

Warm up still needs some tweaking. its hard to see which direction i need to go because my LC-2 wideband takes like 45 seconds to warm up and start reading. I had the warm up working pretty well when i had the tank of e35. BUT i made the mistake of tuning the gas map to e35, now that i have e70 in the tank im trying to tune the e85 map, and then it will also be off. I need to over correct on the e85 and under on the gas like a guessing game.

I'm getting there though. When i first looked at the maps and read about what they do i had no ideawhat it all meant. but after I play with them and see how they work and then go back and read again it makes more sense. Tuning my old piggyback was way easier since the stock ecu did most of the work. I was basically only scaling the injectors

So far though its pulling pretty good at 13psi. Cant wait to get it back up around 23. This combo made 322/338 on a mustang at 17psi last summer. Never had it on the dyno at 23 but it felt rediculus

getting close now. cars pulling real nice with the s203 timing map. logged it, started creeping up in AFRs towards redline so i tweaked the VE table in that area. Almost time to dump this breakin oil for some T6 and start increasing boost

ps, sooner or later i need some learninin view help. the rpm map is mostly blank except a couple random cells that have crazy numbers in them.

reflashed gray coil pack dwells yesterday and switched to Artzizles timing map for gas and added about 5 degress in most areas for e85.

Overall the car seemed to run well at cruise and had a much softer exhaust note. I only made one wot pull in 3rd gear this morning and it felt off. I didnt log it but it felt like the timing was too low. I'll have to log and look again.

I also redid my tip in settings now that i understand they also effect tip out. I been trying to get rid of the exhaust pop when i let of throttle at lower loads. I went back to using 50% of the 420cc settings for my 850's but now i just have a lean tipin and still get the pop