datalog - please analyze

The car is not tuned, I reflashed (turned the battery off) in hope that the trims will get lower. Stock tune with cobb sri and manual boost gauge.

Last night I pretty much took everything off (sri, inlet, hot/cold tubes) and put them on and torqued the clamps super hard. Today I am driving around and still seeing the STFT and the LTFT all over the place.

STFT: at constant mid I am at 0, the moment I press the pedal a little more they shoot up to +10.

LTFT: at idle 14.1 at mid 11.7, good amount of press on the pedal 18, I have not been at WOT yet, but either way WOT does not use fuel trims

At this point I have removed the possibility that I am leaking.

I think that either the climate here in Chicago is causing the trims to be this high or the dashhawk is out of wack (I upgraded it twice this week - just in case)

What's next guys?
 

Attachments

Yeah don't go WOT. Only thing I can recommend is to get your self an Cobb AP and download ATR to calibrate your MAF. Or use off the shelf maps. Any kind of tuning should help. Other people are having this problem too.
 
The car is not tuned, I reflashed (turned the battery off) in hope that the trims will get lower. Stock tune with cobb sri and manual boost gauge.

Last night I pretty much took everything off (sri, inlet, hot/cold tubes) and put them on and torqued the clamps super hard. Today I am driving around and still seeing the STFT and the LTFT all over the place.

STFT: at constant mid I am at 0, the moment I press the pedal a little more they shoot up to +10.

LTFT: at idle 14.1 at mid 11.7, good amount of press on the pedal 18, I have not been at WOT yet, but either way WOT does not use fuel trims

At this point I have removed the possibility that I am leaking.

I think that either the climate here in Chicago is causing the trims to be this high or the dashhawk is out of wack (I upgraded it twice this week - just in case)

What's next guys?

The STFT will normally vary depending upon a number of factors. You can ignore it.

The LTFT will give you 4 different readings (depending upon engine load).

14.1 LTFT at idle is high for a Cobb SRI. Are you sure that the breather hose (from the valve cover) is connected correctly?

BTW, WOT does use LTFT.
 
The STFT will normally vary depending upon a number of factors. You can ignore it.

The LTFT will give you 4 different readings (depending upon engine load).

14.1 LTFT at idle is high for a Cobb SRI. Are you sure that the breather hose (from the valve cover) is connected correctly?

BTW, WOT does use LTFT.

Wot does not use ltft, you can read that in any article (not forums). trims are put in place for emissions, when you go wot the car ignores the sensors and focuses on making the most power
 
Yeah don't go WOT. Only thing I can recommend is to get your self an Cobb AP and download ATR to calibrate your MAF. Or use off the shelf maps. Any kind of tuning should help. Other people are having this problem too.

Yeah man, I am slowly finding out that pretty much everyone on stock tune has high trims with an intake, but not enough people have a dashhawk to monitor. With that being said I put the stock air box on and my trims never exceed +6.2%. Also cobb is making false statements when they say that the sri will change trims slightly. If the stock trim is around +5% in moderate load and the sri brings in 10% more air then you need a correction of up to 15%.

I think that is the reason why the nano has a smaller maf housing...to bring slightly less air so that the trims are not too high
 
I saw your other post where you say you were seeing +36 LTFT. Ain't you suppose to get a CEL once LTFT trims goes over +20?. I'm not sure. Could be that something is wrong with your set up because with my mods (SRI, TIP, BOV) and before Cobb AP flash my LTFT would not go over 8 during WOT and 3.2 at idle with stock tune. I don't know what's next other than having your SRI checked by Cobb if it's posssible.
 
I saw your other post where you say you were seeing +36 LTFT. Ain't you suppose to get a CEL once LTFT trims goes over +20?. I'm not sure. Could be that something is wrong with your set up because with my mods (SRI, TIP, BOV) and before Cobb AP flash my LTFT would not go over 8 during WOT and 3.2 at idle with stock tune. I don't know what's next other than having your SRI checked by Cobb if it's posssible.

Yeah, when I took it down it was clear that the straighteners were not straight. I called cobb, they said to send pics, so I did. It has been more then a week now, no response from cobb. Painful to deal with them.
 
Wot does not use ltft, you can read that in any article (not forums). trims are put in place for emissions, when you go wot the car ignores the sensors and focuses on making the most power

Any article?

http://www.autoshop101.com/forms/h44.pdf

On page 6:

"Because LONG FT is part of the basic injection duration, it affects injection duration in closed and open loop."

If the ECU is in open loop mode, it uses the LTFT to adjust the amount of fuel. It is necessary because no two engines, intakes, MAF sensors, etc. are exactly the same. This is fuel systems 101.

BTW, in open loop mode, only the O2 sensor is ignored.
 
Yeah, when I took it down it was clear that the straighteners were not straight. I called cobb, they said to send pics, so I did. It has been more then a week now, no response from cobb. Painful to deal with them.

Post the pics on the forum, they might respond to that

took me 12 days to get one question answered by email
 

New Threads and Articles

Back