sup.

so i have this problam for a while now.

my afr's go rich for a second when i let off the throttle at idle and in moving decel... the more i tap it in the richer it gets.

please throw me ideas of what can cause this... its driving me insane.

setup:
p28 ecu + crome (ill upload the bin if anyone wishes)
dsm 450's
oem resistor box
tps set to 0.45 closed and 4.47 open
new plugs.


thanks,

 

bump would like to know as well. seems like a tuning problem, possibly related to injector down time maybe. would speek to a reputable tuner

 

That's a very common problem with Crome currently.
Hopefully it will be solved soon.

Personally I'm looking forward to eCtune.

 

i'm waiting for ectune too... but meanwhile i'm getting shitty mpg at traffic, and its tearing a hole in my pocket.

its getting really rich... like 11.5 when i let it off after a wot.
and about 13.9-12.5 when i let off when im cruising it.


i didnt had this issue a year ago.... and know that some other pepole dont have it.

 

larger injectors make it worse. Stock sized injectors it doesn't do it quite as bad, but it's still there.

It's been dubbed Tip-out (opposite of tip-in) Calvin found it a little before he started banging away at eCtune, but he never hinted where it was located in the code.

I've found that if I do not install fuel tools it does it a lot less, also if the voltage offsets are tweeked to match the real time operation of the car, it helps a little too.
But I still see spikes.

 

ill try the same values from my current map on a new map without fuel tools and see how it runs,

can i just copy the final multiplier,the maps and all the options and give it a shot?

 

that's what I'd do.
I'd be running the wideband and dataloging when I try it, just to make sure things don't go wacky.

 

so... i got a quick q,

when should i paste in my fuel map?
now without fuel tools the final.m cant be saved.

the way i susualy do it:
boost tools
adjust boost tables
-fuel tools
and injector size

ps.
i dont remember what was the turbo efficiancy in %.

 

I'd open a new P30-203 bin, add datalogging, remove checksum, adjust gear corrrection, add advanced boost tools, save the bin. Close it and reopen to fill in the maps correctly.
adjust the mbar and RPM scaling if needed, then copy/paste in your values.
(be sure to paste in fuel values twice, for some reason Crome doesn't completely take pasting the first time, watch the values you'll seewhat I mean)
then adjust any of the advances tables.
save, try it.

injector size adjusts the fuel values, which you're doing by pasting in your other maps.
If I remember correctly, turbo efficiency is the same way, it adjusts the fuel for the efficiency curve of the turbo, again you're pasting in your tuned maps so there should be no need to touch it.

I may be wrong with something here. It's been a while since I've rebuilt a turbo bin this way. But recently I've done several N/A bins that were using larger injectors. So the only real difference is the addition of the boost tools and physically larger maps.