So now that i got the car up and runing here scmes the "fun" part, tuning it.

I am basically running a stock stg2 tune with the stg2 injectors. Running the car at 10psi.

I have 60# at home i just want to get all the kinks out of it before i switch over to the 60#s...Yes i know ill have to retune everything once the 60's are in but i just want to get it running good before i start messing with injectors.

So heres my first problem......Anything above 5PSI and 3000rpm in the spark tables the cylinder airmass maxes out almost instantly. How come? LOL i know something is not right. The MAF is blow through in a 3" Pipe.

Next, when rolling into the throttle the car sputers and cuts out as soon as you hit boost. It only does this about 4 or 5 times then it runs perfectly untill you shut it off, then it does it all over again........I think it may be the plugs i need new ones and it could be how my PE curve is set up it pretty much goes to a 11.5AFR as soon as you hit boost. I think i need to ramp it into PE instead of coming on instantly. Any thoughts???

Lets iron those kinks out first then see what the next problems are ..........Arent turbos fun..

 

Ah come on no one wants to help out?

 

get to work.

you've got hours and hours to go.

ps- dial in the maf.....the do it again, and again, and again.

 

I know i got a shitload of work to be done....But the main thing i was wondering is if its normal for the Spark tables to be maxed out at 1.36 g/cyl....Or does that have something to do with my shitty MAF calibration?

 

meh, its all boost dependent. but we are all off table once boost hits.

 

I used to be off the timing tables, but now with the return system and higher WOT fuel pressure I stay a little bit further up it.

 

you shouldn't be off the maf tables yet, nor the timing tables.

maf + pe = fun!

check for boost leaks. get the 60's in there. rise, repeat

 

timing table maybe not, maf tables definitely not. I don't even max those out.
But like they said, tune, log, repeat until she's dialed in. Kill that poopy dynamic airflow, and straight maf tune the bitch. Car will be much better

 

also. something else too. if you **** the mas air settings too much. it will jump to a different g/cyl airmass reading.

i personally hate gm for the dynamic airflow changes over the years.

 

Ya i think thats what has happened, The MAf calibration is fucked up. Im gonna start over with a stg2 maf calibration and go from there.

Just to make sure im doing this right heres what i do......

I am shooting for a 11.4AFR for now. so i set the PE table to 14.7/11.4= 1.29

then using the MAF HZ Vs. AFR ERROR histogram log that and then copy, paste by % error into the maf table right???

 

thats prett much it, don't get on it too hard

 

you get to a point where you know what the numbers should be for X afr via maf Vs pe. then past this point you don't care

 

Ok im pretty sure i know what my problems are now......

I turned up the boost to 12.5psi tonight and was trying to tune the afr to a 11.5 and the car just wasnt having it. Was way to lean and i was using the MAF HZ Vs. AFR Histo and the car just wouldnt richen up........ id richen it up by %40 and it would do nothing. Then just for fun i started playing with the VE table and copied the AFR error over into it and it works great now. The car holds a steady AFR.

I also noticed that i have a p101 MAF performance low. I think my MAF is fucked.......that would explain why i cant get the car to do anything copying the AFR error into the MAF table......but yet copying the AFR error into the VE table it works great...i do have the dynamic air tables set to 2000rpm so above 2000rpm the car "should" be using only the MAF but its running off the VE table.

The maf curve is so fucked up that at 6900hz and above i maxed out the values at 511.99 and it still didnt richen up. The MAF has gotta be hooped. Im going to be trying a new one on the weekend.

Also with the MAF values being that high i am maxing out the spark tables at 2psi. im gonna revert back to the stock stg2 maf calibration and just tune the VE table and see where that can get me untill i try out the new maf on the weekend.

Any thoughts?

 

you either have the worst charge pipe set up ever or a jacked maff....

 

Its 2.5 inch from the turbo to about 8" before the maf is where it goes to 3" then its 3" to the throttlebody........

Im thinking its the MAF as i keep gettin the p101 maf sensor performance low code.

 

Post your logs

 

im gonna try a new MAF on the weekend. If that doesnt help it then ill get some logs.

 

ok i got some things figured out tonight.........the bog issue was a MAF MAP correlation code....the MAF values were so high that i was getting a p0068 code and it was cutting out when entering PE.

So i flashed it with a stock stg2 tune and heres where it gets werid.......In theory it should be all MAF controlled right?? i changed the dynamic airflow tables to 2200rpm. so above 2200rpm its all MAF controlled. So i went to do some runs and it was super lean, 14.5ish so i didnt even get into it hard. Then i increased the VE table %20 above 100MAP and then did a pull and the AFR is almost right in line at 11.4 where i have the PE table set to.

Why is the VE table affecting the tune so much when it really shouldnt be???

Also when using the stock stg2 MAF calibration the spark table isnt off the charts no more. I get about 1.00 g/cyl at WOT.

Still thinking that my MAF is fried. ill post up a log using the stock stg2 MAf calibration and a modified VE table. 2nd and 3rd gear pull at about 12psi.



kinda a shitty pic.......where can i hosst it on a different site?