is this right or wrong? ve and histos

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Nov 26, 2005 | 07:38 PM

ninobrn99

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From: Honolulu HI

is this right or wrong? ve and histos

ok, this is gonna be the first time doing it this way and wanna know if its right or wrong. I figured since the histo's are there to give you the values you need, here's what i did. I copied my ltft's and pasted special>add, then i did the same with the stft's to the same bin. Should this not get me 0 if it does all the math? I copied over to the secondary, then smoothed both. thoughts...

Nov 26, 2005 | 07:52 PM

WS6FirebirdTA00

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its a % chagne for the fuel trims so you cant add, you have to multiply, and to get it right you have to add up the % and then multiply or it will be off

Nov 26, 2005 | 07:56 PM

ninobrn99

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i thought i was supposed to add the ltfts + stfts and then the sum was what i added to my ve?

Nov 26, 2005 | 08:10 PM

WS6FirebirdTA00

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no its multiplied, and that values you get is THEN added.

Nov 26, 2005 | 08:14 PM

ninobrn99

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so if the sum of the ltft's and stft's are lets say....-7 what would the % be??

Nov 26, 2005 | 08:21 PM

soundengineer

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teh LTFT STFT stuff si in %
so if LTFT was -2 and STFT was -3 then total would be -5 %
I usually multiply by % - half so as to not overshoot...

STFT are imediate Fuel trims and LTFT's are Longterm Learned Trims...

usually if you drive around long enough you will notice that STFT's will be 0 or close to it..reason being that when LTFT's are learned far enough the stft's are no longer needing to do corrections...
LTFT + STFT is just quicker as you wont have to log as long to get the right answers