STFTs and LTFTs are way off...

[zuki19]

the ltfts are in 20s and the stfts are in 10s on idle, now, when im accelerating they both are pretty much at 0... someone said i may have a clogged injector.. my IFR tables are fine... what else can i check?

[dsmtuner]

Positve #'s or negative #'s? STFT is your o2 sensor, so it should be switching from + to -. If it stays one way too long then your LTFT kicks in, i.e. if STFT stays negative too long then the LTFT will lean it out across the board until STFT starts switching again. But you'll need to tell us if it is pos or neg numbers so we know if it is lean or rich.

[zuki19]

positive all the way up to 20 and when my Rpms are up like im reving or moving it goes to 0

[peteyturbo]

Originally Posted by zuki19

positive all the way up to 20 and when my Rpms are up like im reving or moving it goes to 0

What injectors, what are you tuning with? if they are stock injectors check your 02 sensor, if they are aftermarket injectors your latencies and/or scaling is not properly set up or your tune is fubar..

[peteyturbo]

Originally Posted by dsmtuner

Positve #'s or negative #'s? STFT is your o2 sensor, so it should be switching from + to -. If it stays one way too long then your LTFT kicks in, i.e. if STFT stays negative too long then the LTFT will lean it out across the board until STFT starts switching again. But you'll need to tell us if it is pos or neg numbers so we know if it is lean or rich.

ltft is not something that kicks in, it learnes from the stft to apply a more constistant pulse width to the injector.

[dsmtuner]

Yeah, I know how LTFT works, I was just trying to put it in terms that were easy to understand, but maybe I dumbed it down too much.

If your LTFT is positive 20 then It thinks it's lean and is trying to add 20 percent of fuel. Is your car stock or do you have stuff done to it? If it's stock I would recommend looking at your MAF(assuming it has a MAF) and o2 sensors, as mentioned. It sounds like an electrical problem, as it would take such a massive vacuum leak to cause your LTFT to move that far that your car probably wouldn't even run. If it's modified than its hard to say what's wrong with it.

[zuki19]

Could my IFR table be off? the guy had a completely built motor that i bought it off of, he set the tune back to when he just had a stock motor and tune.. accept he downgraded to 42 lb lucas injectors...
i have #65 mototron injectors specs are here:

Coil Resistance: 12.5 Ohms / High Impedance / High-Z (No ECM driver modifications required)
Static Flow Rate @ 43.5PSI ( 300kPa ) w/Gas: 60 lb/hr = 630 cc/min = 453 g/min
Static Flow Rate @ 87PSI ( 600kPa ) w/Gas: 85.7 lb/hr = 900 cc/min = 648 g/min
Gain: 0.11ms/mg
Offset: 0.055ms
Turn on time @ 14VDC: 1.14ms
Turn off time: 0.85ms @ 600KPa
Series: DEKA 4 ( DEKA IV )
Orifice Type: Multi-orifice
Spray Pattern: 30 Degree Spray Cone
Factory fitted with Viton upper and lower o-rings

now heres my IFR table... the guy had 3 calibrations to 3 different injectors on the cd, i chose the ones i have and put it in my calibration...
My Injector Flow Rate looks something like this:

mSec/Gram
kPa 0 122.31
kPa 10 120.58
kPa 20 118.94
kPa 30 117.36
kPa 40 115.87
kPa 50 114.38
kPa 60 112.98
kPa 70 111.64
kPa 80 110.36
kPa 90 109.06
kPa 100 107.84

I really think my MAF is off though and/or could also be my IFR table, right now we are trying to fix it, than i want to get my MAF retuned.