Yeah, why is your VE 100g/sec higher than your MAF? Mine are almost identical.

 

I see it. You got that weird injector pulse width followed by a huge spike at 5200 rpm. I've seen this on Dan's car and WSFrazier's car and have no explanation for it as MAF and VE are both smooth at that point.

Gimme a sec with paint and I'll highlight it.

This:

 

it's hard to help someone out who is 2k miles away

damnit!

i saw that!

 

yeah, my car isn't really completely tuned yet, I have no time to work on my own car anymore lol. I'll be going over it tonight though that I finally have a night off from the local cobalts..
As for my AFR ... well that's a different story, need to work on the maf output up top because it'll hold 10.70 (was at 11.8 comm 11.8 actual) then out of no where spike up to 13's (no knock though thankfully) I'll see what I can do on it tonight and hopefully post up some more logs with the maf adjusted better.

cool thanks

yeah that spike, I can't figure that out for the life of me, the car has done that since day one, and I've tried adjusting everything to do with fuel to no avail.... probably some weird ass table we still can't edit yet with hp tuners

 

is it something to do with the fuel tables themselves? have you changed the fuel filter recently? may sound stupid i know, but im trying to come up with idea's to help out

yeah that spike, I can't figure that out for the life of me, the car has done that since day one, and I've tried adjusting everything to do with fuel to no avail.... probably some weird ass table we still can't edit yet with hp tuners[/QUOTE]

beat me to it!
i have something that may help.

 

Dan's car did it and WSFrazier car still does it and we can't figure out what causes it. On Dan's car it felt like a horrible surge and then it would be fine again.

Theres a possiblity that the injector offset table is incorrect but the weird thing is, at least on the local cars, it seems to be proportional to rpm and not map or maf.

 

when you get a chance. take a gander at what i sent you earlier. compare the two. i have never had that issue since i put the 60's in over a month or so ago.

 

yeah I know it's always in the same area... most time's though when s/c'd it'll hit at 5800... but my afr doesn't plunge like it used to though at the point, it actually leans out.. but I think I just found my issue of the lean thing... I loaded in the wrong maf output table lol. oops.

but still can't figure out the ve drop off up top, as I said it did when I was sc'd but not nearly as bad

 

Are you bumping the 215kpa ceiling on the VE table?

Edit: I see what you're talking about there. Your actual MAP pressure isn't dropping, only the calculated airflow from MAP (VE tune). If you get bored, take a screenshot of your VE table and maybe we can see why from there. It looks like you're transitioning into a cell that is calibrated for less airflow at a higher pressure.

 

will do... I"ll have it up in a minute.... haven't really had anytime to mess with it, so it's probably a bit off

 

Downloading it now. Wes came over yesterday and installed 64 bit Vista on my desktop so I have to go and redownload my tuning programs.

 

 

ooooohhhhhhhh im sorry.
lol

 

so how out of wack does my ve table look... As I said really haven't had a chance to mess with it... anything in the upper area I should play with, cause I thought that table really wasn't used unless maf failure.
any way just re-did my whole maf scaling... and was going to install the new TB today, but I save that til I get the car running right first

 

Yeah its out of whack, but it won't affect fueling as long as the MAF is functioning. The jump to 1850 is what is causing the large difference between MAF and VE airflow. Youthen transition back out to a normal cell after hitting peak boost as you reach redline.

I think the biggest drivability problem is that goofy commanded pulse width at 5000 rpm and the rich spike following it. It could be an OS problem, which has me wanting to force the OS on my car, if its difference, onto Wes' to see if it fixes it.

 

hmm that could be it.... I have an old version of it,,, just went and did some new logs with the maf retuned.....
idle if f'd up now, afr jumps all over the place, but driveability is better. But now my afr is in the 10's then spikes to 12.xx up top.... getting a litttle better though... screen shots will be up in a minute

 

Can you feel when this is happening? I have the fkt injector pulse circled as well as the airflow calculation on both the MAF and VE to show its not in the airflow calcs doing it.

 

oh yeah the car "kicks" a little then just takes off... when it was s/c'd though you couldn't really feel it.

 

Everything else should just be in the MAF calibration unless there is a physical problem somewhere (boost leak, boost creep, etc.) except for that issue above. Completely unexplainable for now.

 

that's what I've been boggled by. I do think there is a boost leak somewhere though, testing it friday night (yeah I know driving for 3 weeks and never did a boost leak test since I installed the turbo lol). I have a few ideas of where and what might be leaking, but I can't think of anything after the maf, unless the tb gasket I made blew out again. that could explain the shitty idle too

well if any of the other guys familiar with the tuning process for a turbo cobalt have any ideas please chime in. I'll also send the tune to certain people if they really need to look at it

 

There is a highlight of my spike

Dan

 

Ooo, my car does the samething.

 

Nice work Paul . I was watching the video's again and saw some jack ass comment " My stage 2 with 15psi and an injen seems faster " LOL

 

Yeah, I laughed at that one. considering at 16 psi and 1/2 throttle I blew the doors off a 2.7 pullied cobalt that I had tuned

 

lol bobby.. man you make me want turbo so bad lol i hate you lol