PCM Diagnostics & Tuning HP Tuners | Holley | Diablo
Sponsored by:
Sponsored by:

LTFT going + at WOT, why?

Thread Tools
 
Search this Thread
 
Old 10-26-2005, 05:09 PM
  #1  
TECH Senior Member
Thread Starter
iTrader: (33)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,318
Likes: 0
Received 1 Like on 1 Post

Default LTFT going + at WOT, why?

ok well i was looking at the logs and what i thought was right before going wot the trims will lock to whatever they are at. i went out for a ride, wot fueling is right where it needs to be, and all of a sudden bank one is +4.7and bank two is +0.8 at WOT and running too damn rich. why in the world is this happening? what should i check on?
Old 10-26-2005, 06:29 PM
  #2  
TECH Addict
 
Bink's Avatar
 
Join Date: Jul 2002
Posts: 2,258
Received 0 Likes on 0 Posts

Default

Are your trims zero or negative,just before WOT on your scan?? If they are positive then the trim will be added to your fueling. If they are negative they should not be added (drop to zero in cell 22 or 15). Long and short - you want your LTFTs "0" or slightly "-" .
FWIW.
Old 10-26-2005, 06:39 PM
  #3  
TECH Senior Member
Thread Starter
iTrader: (33)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,318
Likes: 0
Received 1 Like on 1 Post

Default

the last numbers i saw were 0 on the stft and 0,0.8 on ltft. then it went from cell 14 to 22 and went to ~+4 on the last log that i just did. so is it the last hit just before WOT or a few hits before?
Old 10-26-2005, 06:47 PM
  #4  
TECH Addict
 
Bink's Avatar
 
Join Date: Jul 2002
Posts: 2,258
Received 0 Likes on 0 Posts

Default

I would guess it ignores transients. It is dependent on the LTFTs though...not the STFTs (It's been a few years since I ran closed loop).
Old 10-26-2005, 07:06 PM
  #5  
TECH Senior Member
Thread Starter
iTrader: (33)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,318
Likes: 0
Received 1 Like on 1 Post

Default

ok im gonna go back and look at the LTFT and see what is going on with them before it goes wot. it just sucks cause one day the car is strong and it will stay 0 and the next day +4 to +7 and it feels like a slug
Old 10-26-2005, 07:15 PM
  #6  
TECH Addict
 
Bink's Avatar
 
Join Date: Jul 2002
Posts: 2,258
Received 0 Likes on 0 Posts

Default

4-7% rich would feel sluggish

If I remember correctly keeping them in the neg 3-7% will help alot. Maybe HumpinSS will jump in with the correct range??
Old 10-26-2005, 07:25 PM
  #7  
TECH Senior Member
Thread Starter
iTrader: (33)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,318
Likes: 0
Received 1 Like on 1 Post

Default

ok well highest ltft before wot is 1.6 on both banks, could it be that it remembered old numbers and it needs to be reset? so keeping the whole VE 3-7% rich?
Old 10-26-2005, 07:50 PM
  #8  
TECH Addict
 
Bink's Avatar
 
Join Date: Jul 2002
Posts: 2,258
Received 0 Likes on 0 Posts

Default

Originally Posted by WS6FirebirdTA00
ok well highest ltft before wot is 1.6 on both banks, could it be that it remembered old numbers and it needs to be reset? so keeping the whole VE 3-7% rich?
Whatever it takes to keep cells 1-14 slightly negative.
Old 10-26-2005, 08:22 PM
  #9  
TECH Senior Member
Thread Starter
iTrader: (33)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,318
Likes: 0
Received 1 Like on 1 Post

Default

haha thanks man, im wondering if i just didnt have enough drive time on this one to get the trims to settle in. we will see, im gonna drive this around for a while like this and see what happens. so the only thing related to + trims wot is being lean somewhere going into wot? right
Old 10-26-2005, 09:25 PM
  #10  
TECH Addict
 
Bink's Avatar
 
Join Date: Jul 2002
Posts: 2,258
Received 0 Likes on 0 Posts

Default

Right ......although I never actually thought of it in those terms. Good point.




All times are GMT -5. The time now is 08:21 PM.