WS6FirebirdTA00

iTrader: (33)

attached is a pic of the scan.

as you can see the iac steps just dip very fast. at this point, the rpms become fairly unstable and the STIT goes up. the friction, or startup, airflow goes to zero very fast for some odd reason. it decays fine and then all of a sudden its just set to 0. i have no idea why. this could be part of the problem but i am not sure. the fuel multiplier is also 1.00 so i dont know why it would want more air at this area. i am just wondering i have some airflow values set too high that makes the motor thinks it needs more air on the startup. im lost on this one, i have tried everything i could think of.

any ideas on what else i can try????

WS6FirebirdTA00

iTrader: (33)

anyone?

MNR-0

Halve the friction airflow decay rate and set the friciton delay to 1

gameover

Hard to tell without the VSS and TPS logged as well. Startup airflow will generally go to zero if the throttle cracker or follower TPS or VSS thresholds are met during startup.

WS6FirebirdTA00

iTrader: (33)

all this happens at 0 mph and 0 tps, all start up and idle in the driveway.

WS6FirebirdTA00

iTrader: (33)

ill try that out, i would still ike to know why it wants more air when after a min or so of running all is good.

WS6FirebirdTA00

iTrader: (33)

i think i may have found something, anyone ever mess with ect bound zones? my car acts up above 60*c or so and that is all its own bound. it is located in the dynamic airflow section, if you know what it does let me know lol

WS6FirebirdTA00

iTrader: (33)

anyone know anything about those tables?

gameover

I think the issue is this:

1. Your LTIT is learning to a particular position at normal operating temp.

2. when you start the car after it has cooled a little (ie. your scanner shows 68 C) the base RAF is too low at that temp and once the adaptive idle engages the learned LTIT is incorrect and the STIT has to make a quick upwards adjustment.

Try increasing the base RAF at that temp a little.

soundengineer

iTrader: (16)

or use the histograms on my site to do RAF and nail it

WS6FirebirdTA00

iTrader: (33)

LTIT is set to remember 0, when the car is warm the idle trims are all zeroed out. if i start the car cold, once it hits 60*c its all fine. plus if i increase it at 80*c once the car is driving around town, the STIT will go to -0.50.

as you can see in that pic i attached the LTIT is zeroed out anyway

WS6FirebirdTA00

iTrader: (33)

raf is nailed, there is nothing wrong with it after the car runs a little, it only has a problem within a minute or so after start up. if i start below those temps, once it reached them the idle trims are zeroed out.

SmokingWS6

iTrader: (1)

Just courious, did your new RAF table raise or lower the values over stock? Some raf caculators I have used rendered the car almost undriveable after inputting the data. IAC counts quickly dropped after starting.

WS6FirebirdTA00

iTrader: (33)

my new raf? its higher than stock values. i havent used calculators i have done mine by hand. im going to try out soundengineers histogram tomorrow and see what that shows.

i made some quick changes from the setting i had before based on cold start and added airflow to 80*c and up. that iac step dip was not there this time however the idle trims still went to 0.80 on start up. i have also gone back through the tune to make sure there werent any odd tables changed. im just not understanding why on a warm start the idle trims go that high on me, then when i came back from the ride around the block, they were -0.60