this was the first time i have done any data logging since the install of GMS2 and nate's 2.9" needless to say i am NOT happy. i will post a log file tomorrow when i make a few shorter runs and play with pulley size and some warmer ambient temps. didnt think anyone would want to look at a 15 minute log file anyways. but here's the highlights... im getting up to 3* KR below 3k rpms and none up top. at 6800rpms my injector duty cycle is at 125% its advancing timing 21* and i have one cell of 36* at .92g/cyl and 5888rpm 16.5psi max
ambient temperature 60*
94 octane
iat2 stayed around 110*
mods are stg2 and 2.9", k&n with airbox mod, TTR upper mount.

im mainly concerned with the ridiculously high IDC. my next mod should probly be some siemens 60#ers...

 

back your timing off down low your running to much that will take care of most of your knock. Do you have a wideband? If not what are you commanding for a fr that could be why you are at 125% idc's.

 

well the tune is an untouched stage 2 from GM. its commanding 10.9 to 11.3 when im getting these high IDC. i havent even looked at messing with the timing yet. gonna need to look into it

 

you could lean it out a little bit probably to 11.6 across the broad and that might help a bit, but the timing just seems a little out of whack becuase you are getting knock that low

 

i dont have a wideband yet. waiting to buy a new downpipe so i will have a spot to put the w/b and not bother messing with my stock dp. i already have a config that will log a w/b sensor. if you are around later i will post some snapshots of the log to give a better idea of what im workin with.

 

send it to my email if ya want i will pm you

 

what a/f are you commanding?

 

actually, when I was logging my car yesterday I saw up to 6 degrees of knock at low RPM's.....I have a stage 1 kit with a 3" pulley, AEM intake and 1 step colder plugs.

 

area47- read above for commanded wot afr
lsjwannabe- you have mail

 

thanks dude i have to go to work at 3 so i will try to take a look at it by tonight

 

Okay, so if you are using a stock stage 2 tune, here are some of the issues you are going to run into.

1 - Smaller pulley builds boost faster. ECM gets scared and issues burst knock. You are likely seeing a lean spike (or you would if you had a wideband) just before the knock starts.

2 - Stock stage 2 commands 10.8, but if you are running in Closed Loop (stock), you are probably entering PE with at least enough LTFT to get you down around 10.4 or even richer. Hence the huge duty cycles.

You don't have the ability to do much about your fueling tables, because nobody has enough info to get the right settings, so for now, i would say do the following:

Tune normal driving MAF table using your long trims. Then fail your MAF and tune your VE table using long trims. Then go back to your MAF table and carefully tune PE using short trims. Set your PE EQ to a conservative 11.4. Limit boost over 6000 to whatever will get you 15 psi.

This will have to do you untill you get a WB. Here is the PE EQ I use:

1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.09961 1.10254 1.10938 1.11914 1.13379 1.15234 1.17188 1.19043 1.20801 1.22559 1.24316 1.25586 1.26563 1.27441 1.27832 1.28027 1.28027 1.28027 1.28027 1.28027 1.28027 1.28027 1.28027 1.28027

 

all the help is appreciated. +rep has been distributed.

heres a snapshot of the graph, marked a the highest point of idc. needs to be clicked on again in new window to show full size.

 

That's really weird....I logged my Stage 1 and 3.0" pulley and I got no higher then mid 50% IDC.....

 

^^^ your config is only logging half of your IDC. it is trying to log a 2nd bank of injectors, get those out of your table and you'll see your actual injector numbers.

since the stock PE multipliers are in no way equaling 10.x afr, im going to guess that the piston protection and COT and other safety enrichments are causing this insane commanded afr. heres my PE mult. VS rpm.
1.13672 1.13672 1.13672 1.13672 1.13672 1.13672 1.13672 1.13672 1.13672 1.13672 1.13672 1.10742 1.08789 1.08301 1.08203 1.08496 1.10449 1.11426 1.14355 1.16504 1.17285 1.17285 1.16895 1.16113 1.14160 1.12207 1.12305 1.11719 1.11719 1.11719 1.11719 1.11719 1.11719

 

Stage 1 and 3 inch pulley at WOT with a good tune should see about 70-80% minimum. It's possible you are logging IDCs incorrectly. Do you know what your injector PW was?

 

Please post the HPL file
WopOnTour

 

That would be my guess as well. Good catch on trying to log both banks.


Why is your PE backwards? 1.1362 is 10.8/1 AFR, but your log shows commanding 11.9. The ECM may be trying to compensate for your entering PE with a 5.5% LTFT, who knows. If you were in COT, it would command richer, not leaner. You may want to spead up your enrichment rate a touch. Stock is a little slow at .2 or something, right? I like mine around .8.

Anyway, definately need to tune that MAF! That little burst knock is fairly normal, BTW. Tuning your fuel tables helps that.

Hey, dude. Haven't seen you in a while. Can't post hpl's here can we?

 

place saver

 

Still? They were supposed to rectify that months ago!
OK then email me your HPL to wopontour@gmail.com an I'll take a look at it
Who's tune?
Wop

PS> I've been around

 

I guess you can zip an hpl file and post it...

Hey, what are the chances that you have an offset vs volts vs MAP spreadsheet? I think I have a good offset table for the siemens 60, but I still have some issues at short PWs. I think they are adder table related, but they are proving a bit tough to dial in.

Okay, enough jacking for this thread. Yea, dude, post your file.

 

yep, your injectors are pissed!

what year is your car?

 

i believe it is a 06

 

i guess a good question now would be, do you have 42's?!?!

 

you guys talkin to me? if so, yes its an 06 and yes im runnng 42#s. its all gm stage 2 crap. havent touched that tune yet. ive been slowly trying to piece together a new tune.

i did a few more logs today... i will try to post the snapshots, i have no idea how to upload the hpl to this site. the temp was warmer today so i was seeing higher IATs and slightly lower IDC but im still at 109% before 7k rpm.






sjschafer- the pe isnt backwards. the cot and piston prot was probably commanding 10.x.
according to the pe calculations in the sticky posted by (i think) Snipes, 1.1362 would command about 12.9 (1.1362x12.9=14.7) unless i misunderstood and im figuring this wrong...

 

also, if i run the PE multipliers that you gave me, should i disable the piston protection and COT? or will those numbers command enough fuel to keep it relatively safe?