Hi,


I was wondering if anyone can explain what the data byte means on the top column in fuel compensation,


My car was tuned at 57 Degrees(temp outside), and it seems to run good around 54-58 degrees, but runs like crap under 45 degrees out side, Feels too rich.


Anyone ways if anyone knows this would help me a lot in understanding how to fix it.

not sure if it matters but:
3.6 liter rev up.
11:1 comp
s7 cams
port, polish, mrev2 spacer, all bolt ons. balanced block, forged pistons/ rods.
Also attached my fuel and timing tables for refference

 

omg the coveted 360z

 

Um, it looks like he built the motor and maybe bored it a bit, notice the 11:1 compression...

OP

 

yes the 360z... overbore for new pisstons.

I can tell its rich because of the gurgling, and light backfiring. ive dataloged, and it is hitting a richer amount than what I had it tuned for.

so yea thats where im a bit stuck.

 

data byte means that uprev didn't bother to set up the binary conversion in rom editor. If you do live tuning in cipher it should have values which correspond to the actual fuel schedule. After making adjustments in Cipher, be sure to save them and load them into your ROM file in ROM editor and reflash so you don't lose them next time you switch maps.

The bad news is that Uprev has zero temp compensation for anything other than startup so you're probably going to have to make a new map for winter if the richness bothers you.

 

I know this is a crazy question but how do you guy learn about this? I have up-rev and I really want to learn or know how to do this or understand it so I know whats going on with my car.

 

Databit is the base fuel schedule. Like Djamps said... its just not converted on the fuel mapping like it is on the ignition table. I usually just look at the ignition table and and count the columns in relation to the fuel table. From the look at your screen shots there can be alot of improvemnet in your tune. Timing values look a lil low and ya have some large jumps in your Fuel Maps(which is usually set all at 100 and tune MAF values)....

Also UPREV doesnt have adjustment for temp comp as a tunable parameter... but that doesnt mean it isnt there. Once all your trims are set up correctly i havent had any temp comp issues...

If your interested in some E tuning PM me.

Thanks, Vince

 

I had the car tuned with a good tuner, but hes not a big uprev tunner, he mostly tunes hondas/ subis/ evos,

I only made 281 whp, I thought I should have made a lot more,
car drove great for the next hr or so after the dyno, but the next days/ weeks it didnt drive as good,

I ended up re street tuning it my self, started to driver better again, but never felt like it did right after the dyno, and plus I should be making about 300whp, ( by comparing what other people made with same build, they actually made more but im being conservative)

pmed!

 

I just started tuning today for my TT G35, and I ended up stopping for the day (started late anyway) When I got to this point, I was like ummmm WTF....lol Thanks for cleaing this up guys.

Vince, what do you mean when you said

 

when setting up your tune you should set all the values in your fuel maps to 100... and then tune the vehicle off of MAF values. Then when your all done you can go in and trim the fuel comp tables. I try to limit those values to plus and minus 5 Percent

 

It means that Uprev released an unfinished product and charged $700 for it LOL...

Isn't temp compensation "baked in" to the recipe becuase it is a MAF based fuel strategy? Air gets denser as it gets colder and the MAF reads mass flow rate, which will be higher when the air is denser.

Maybe, becuase it has gotten colder since your tune, you are hitting higher base fuel schedule values than before? It looks like your tuner only tuned the fuel compensation table up to 14.58 BFS (or 192 in "data bit" speak). Maybe you are now getting into the 15.79 BFS (208) column and hitting the 100% numbers which are about 10% higher than the adjacent column to the left. You could try copying the fuel compensation numbers from the 192 column into the 208 column... You can also turn on the tracer while you drive and see what is the highest column you are hitting.

 

When you say that the fuel maps should be set to 100 and the vehicle should be tuned off of MAF values, do you mean that the tuning is done on the "Mass Air Flow Sensor" screen where you enter a dataword for each voltage?

If that is the case, what is the procedure for tuning that MAF voltage to dataword screen without a dyno, but using Cipher for logging?

Also, I assume that then, I would just make sure that my compensation tables for each of the maps would be the same and that I would just change my target AFR table accordingly for the goals of my map.

 

Do some pulls and log the MAF voltage / target AFR / actual AFR / Corrections and you can make a chart that will assist in tweaking the voltage values -- that was the whole point of my tool, to help automate this process. For example, if the ECU is always 0.5 AFR too high at 1.5v then pull a couple percent off the 1.5v value, ect. I did low power, medium power, and WOT pulls and logged them all separately to get a good spread of voltage values.

 

Geez, that's so simple that I feel like an idiot not figuring it out on my own.

So is the following headed in the right general direction/order:

MAF Tuning via Cipher/Osiris
-----------------------
I will:
1) Log MAF voltage, target afr, actual afr
2) Compare/Review above logs and adjust MAF to databyte/word table
3) Rinse & Repeat

Fuel Compensation Tuning via Cipher/Osiris
----------------------------------------
Once the MAF tuning is pretty close, I will:
1) Log Base Fuel, target afr, actual afr, RPM
2) Compare/Review above logs and adjust Fuel Compensation for the appropriate RPM vs Base Fuel cell in that table
3) Rinse & Repeat

Ignition Timing Tuning should be done on Dyno

 

Sounds good!!! You could also make some final A/F adjustments for WOT on the dyno; it's not too safe to do a bunch of WOT pulls on public roads lol.

 

But its alot more fun

 

Good stuff guys!

But, how do you log actual A/F if you have a 2003 that only has narrowband 02 sensors and a separate AEM Uego wideband gauage in the cockpit? I have a case of "dancing a/f" during idle even after playing with k multiplier and Fuel Compensation..

 

Have you modified your lower o2 sensors in any way (non foulers, ect)?

 

Check the injector latency. I had a dancing (i guess that's what I would call it) AFR at idle and a few other places. This solved 99% oh my issues

 

I set the injector latency specs in UpRev rom editor according to the Injector Latency thread here for these RC 750cc injectors. But, I'm still waiting to hear from RC Engineering to confirm those specs..

Djamps,
To my knowledge there is no 02 foulers, just a stock 02 sensor on bank 2 and Aem Uego wideband sensor on bank 1 + oem stock 02 sensor (edited with correction after looking under the car) :P.