http://en.wikipedia.org/wiki/Analog-...ital_converter

 

been running the SD patch for a couple of days now on 90550001,
couple of issues in closed loop the car would idle at 15.7 to 16.7 AFR
same on cruise, low fuel trims hit -9.7%

tried to rescale the injectors and the latencies no change to the trims,
so I ran in open loop car idles at 14.7 but when ya go over 2500 rpm and around 60 load it leans out to 17.5 AFR when ya accelerate past this to 3500rpm it starts to richen up and hits 12.5 AFR at 5000 rpm.

the fuel map has 15.1 from 10 to 100 load so I cant see what is affecting the fuelling,
it has to be something mechanical that is changing the AFR as the ecu should just use the maps,
retuned the fuel map to see if it would sort it but the map ended up all over the place,
used lots of logs to figure out the map to load scalings and had to run at 100%ve to get the car to this stage,
any suggestions???

BTW I do like the smoothness of the SD patch,
would like to be able to run this all the time,

 

You shouldn't have to change the injectors, latencies or the fuel map. I am still running the same settings as I had on the MAF.

cossie1 had some part throttle glitches which I think were him lean misfiring, I suppose there could be a bug in my 90550001 conversion since I could not test it, but the logs he supplied suggested it was working as intended, and it is difficult to see where the is likely to be a bug.

grayw mapped ant1's MIVEC stroker GT35R in an Evo 8 but using my Evo 9 ROM (88570008) and had no trouble.

Closed loop may well be confusing things, but it is odd that you can get idle to 14.7, turn it on and then it messes it up.

Need to see logs. Can you do a VE log using your MAF sensor as described before in this thread? (We then take MAP/load and plot it by RPM and MAP).

Can you post up some of the problematic logs and your VE maps?

 

will do thanks for the help John

 

I forgot to mention before that the fuel temp ADC is hardwired to read thermistors. It cannot read a 0-5V signal. So its good for reading another temperature signal. Might be interesting to install a temp sensor either post-IC or between the turbo and the IC.

 

FREAKING SWEET speed density is a success for me so far. driveability seems better for me. my mods are 3071r, 280 cams, meth, bolt-ons. LTFT low are around .029 and LTFT mid are -9, still have to do a little more tuning but that is a base map going off my previous MAF logs. I had a lean idle, STFT were around + 20. I changed 90% to 94% from 500-1000 in the VE RPM table and that cleaned it up. I would finish up tonight but wife has plans for us lol. So tomorrow should do some final driveability tweaking and WOT tuning. Too all the guys that help make this happy THANK YOU.

 

Nice one. I gather grayw now has nearly finished tuning a 2.3 with GT35R, running 32 PSI. With 650cc injector scaling (on 1000cc injectors), the RPM and MAP VE on full load are near to 100%. Driveability is better than his MoTeC which the owner is now selling, and he also prefers it to his previous Autronic.

 

I'm testing your SD John with your ROM and I have a little problem.
Engine is ok and it is very drivable but when I put one gear down (sorry but don't know the right word to say this) and I push the pedal of accelerator it seems that the engine doesn't received the gas.

I noticed also that in your ROM the fuel trims are slower than 88580014, is it normal? Normally fuel trims change every 3 minutes and 55 seconds but your ROM change after a lot of time (not calculated yet)...

 

A lack of response is likely because the VE tables are wrong for your engine. Log, test AFR, correct, log more etc.

The fuel trims seem to update quickly sometimes, and slower others, but they work well on mine running the same ROM.

 

So far today LTFT low -2.5 LTFT mid -5.8, I am satified with that. I took out about 2-9% in some areas from the VE RPM table to get my target afr back the way it was for part throttle, and WOT. Some reason it feels alot faster than before but my car was down for a week or so waiting for axles too. My wife was still amazed that I was driving around with the UICP off lol, she has came and gotten me a few times before with a blown off IC pipe. I am currently using the MSD IAT (same as gm but cheaper) and GM 3bar with my own scaling.

 

bnice, would be great to see your VE tables and your mod list.

 

Sure bro no problem

Performance:
-ATP 3071r Turbo
-Bnice Meth Injection
-Bnice Meth Injection Fail Safe integrated with Tephra V5.1 altermap switching
-Comp 280/280 Cams
-Fidanza Cam Gears
-ARP Head Studs
-ARP Rod Bolts
-Walbro Fuel Pump
-Apexi TBE
-TurboXS BOV
-Injen LICP
-Injen Intake w/ Perrin filter
-Ebay FMIC
-Ebay Radiator
-GM 3port EBC w/MrFred Direct PSI boost control
-GM 3bar Map Sensor
-MSD IAT Sensor
-JCSbanks Stock ECU Speed Density Conversion



ALL wrenched/tuned by bnice01

Suspension/Chassis:
Tein S-Tech's

Drivetrain:
-Exedy Stage 2 4puck Sprung
-Gruppe-S Flywheel
-B&M Short Shifter
-B&M Shifter Base Bushings
-Buschur Racing Evolution Shifter Bushings

I pasted all my screen shots on the attached word doc. Well I wasnt satified like I thought and got my trims looking better, LTFT low -3.6 & LTFT mid -3.9.

 

Thanks. Interesting dip at 60kPa (as a percentage of the top row), and also at around 5000 RPM. Certainly not saying they are wrong, presumably your engine likes these adjustments to give the correct AFR, perhaps sometimes I enforce a trend on something when it actually needs to be lumpy? Might be real changes in VE, or adjustments around your old MAF arrangement that wasn't so linear any more, or perhaps cam related?

 

I think it has to do with the cams and how I have them degreed. My highest load point is around 4700-5200. The cams are setup to get as much top end power possible since I drag race. Yeah I made the gt3071 a little lagging but going thru gears I stay in my peak power range. Well looking at some VE tables from a SRT-4 via SCT I tuned they were quite "lumpy" stock . But someone of your knowledge level said that reflashing your stock map makes your car faster, you will be surprised how many people will try it lol.

 

I want to do it soon, is it still hard to tune on a 2.3L with large turbo??