LTFT question

Predator support for GM gas vehicles

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skolman91
Posts: 12
Joined: Tue Sep 08, 2009 2:37 pm

LTFT question

Post by skolman91 »

ok adjusted my ltft's the other day, and today i go out for a ride to check to see what had changed. while riding today i noticed while crusing 60-65 at almost 2k rpm my ltfts change with throttle position. ex. anything below 23%ish throttle my trims are 4.xx, but go over or around 25% throttle and they are .78 (which is around where they should be after my last adjustment). i havent read anything on throttle percentages needing to be above a certain percent to get correct ltft's..??
I noticed this after taking it off cruise because the trims were 4.xx, and watching trims and TP% while messing with throttle..
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06MonteSS
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RE: LTFT question

Post by 06MonteSS »

you're fine...

you let off the gas so they changed... normal operation...
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skolman91
Posts: 12
Joined: Tue Sep 08, 2009 2:37 pm

RE: LTFT question

Post by skolman91 »

ok i re-read my post and it sounds a little different than what im tryin to say.
constant driving at Tp% of 23 or below= 4.xx ltft
constant driving at Tp% of 25 or above = .78 ltft
both on cruise on flat road
im sure i am fine just a little curious, last time i watched data i noticed it would change ltfts with throttle usage or coasting, but thats obvious like u said.
but like i said im just curious, ill prob go back out tom and see if this is really happening, or im crazy..
concoursd
Posts: 1144
Joined: Fri Mar 16, 2007 9:01 am

RE: LTFT question

Post by concoursd »

how does it perform? Any better or worse from one log to the other?
skolman91
Posts: 12
Joined: Tue Sep 08, 2009 2:37 pm

RE: LTFT question

Post by skolman91 »

it doesnt perform any different while this is happening..
went out and watched again and sure enough at 25%TP the ltft's change from 4.xx and 5.xx to .78 and 0. @2100 ish rpm
must be ecu switching into saved ltft's?
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