What are LTrims
Thread Starter
TECH Enthusiast
Joined: Nov 2001
Posts: 578
Likes: 0
From: Henderson, NV
What are LTrims I have been seeing this quite a bit. Fair question. We all need to start and learn something at one time or another right?
And what do these have to do with MAFT, A/F ratios and tuning. Im installing headers this weekend and after dynoing, depending on A/F ratios, i may get a MAFT..
-Also do you guys think i dont need a dyno, just an A tap???
And what do these have to do with MAFT, A/F ratios and tuning. Im installing headers this weekend and after dynoing, depending on A/F ratios, i may get a MAFT..
-Also do you guys think i dont need a dyno, just an A tap???
Re: What are LTrims LTRIMs are your long term fuel trims. The computer tries to hit a perfect A/F ratio. Over time it learns if the car is consistently off and factors in an adjustment when calculating how much fuel to add. Positive LTRIMs mean the computer is adding extra fuel; negative means it is subtracting some fuel from what it calculates is the proper amount.
If your LTRIMs are out of whack (more than +/- 10%) you can use a MAFT to compensate for it, assuming the cause is do to mods and not a mechanical failure). A MAFT can also compensate if mods have made your car run too lean or too rich at WOT.
IMO, dynoing for the sake of dynoing provides only a little useful information. However, a Wideband dyno tells you if your A/F is good at WOT, which is not accurately measured by information collected by the car's sensors. If your A/F is bad, you can gain HP by fixing it with a MAFT or LS1Edit.
If your LTRIMs are out of whack (more than +/- 10%) you can use a MAFT to compensate for it, assuming the cause is do to mods and not a mechanical failure). A MAFT can also compensate if mods have made your car run too lean or too rich at WOT.
IMO, dynoing for the sake of dynoing provides only a little useful information. However, a Wideband dyno tells you if your A/F is good at WOT, which is not accurately measured by information collected by the car's sensors. If your A/F is bad, you can gain HP by fixing it with a MAFT or LS1Edit.
Teching In
Joined: Jan 2002
Posts: 37
Likes: 0
From: Orlando, FL
