A question about the MAFT
Thread Starter
TECH Addict
Joined: Mar 2002
Posts: 2,189
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From: Glendale, CA
Re: A question about the MAFT Man was I confused (still am). So I did some reading and this is what I came up with.
When turning the dial to the 5% rich position, I am making the car run richer.
So if I am running rich right now, I should adjust it to the %5 lean position to make the car run leaner right?
These are all for the Base adjustments.
I searched about 200 topics and I came across many different answers.
So if you know what is correct, please post. It will help me and everyone else.
When turning the dial to the 5% rich position, I am making the car run richer.
So if I am running rich right now, I should adjust it to the %5 lean position to make the car run leaner right?
These are all for the Base adjustments.
I searched about 200 topics and I came across many different answers.
So if you know what is correct, please post. It will help me and everyone else.
On The Tree
Joined: Mar 2002
Posts: 147
Likes: 0
From: South Florida
Re: A question about the MAFT If your car is rich right now then you want to set the maft to 5% lean. This will only affect part throttle if you are setting the base setting. Please make sure you are actually running lean via atap or some other scanning device. On my car I had to richen up the base setting to get my ltrims to a slightly negative reading while cruising. Hope this helps.
Re: A question about the MAFT ok.... I want to point something out here re: the MAFT.
The MAFT will alter proportionally the output of the MAF, as a frequency. The car learns what the fuel requirements are at a given MAF frequency to achieve 14.7:1 a/f part throttle. This "learning" is entered into the LTFTs and the car will return to its original A/F ratio (lean or rich).
This information eventually gets learned into the LTFT at WOT as well.
I own a MAFT, but I have only used it to try A?F changes very quickly on a dyno. I have always operated as if those changes will get learned out in the next 100-200 miles (which they have).
The only way the MAF differentiates between base and WOT is the frequency output from the MAF, whihc I think it changes at 8000 hz (I dont remember exactly).
chris
The MAFT will alter proportionally the output of the MAF, as a frequency. The car learns what the fuel requirements are at a given MAF frequency to achieve 14.7:1 a/f part throttle. This "learning" is entered into the LTFTs and the car will return to its original A/F ratio (lean or rich).
This information eventually gets learned into the LTFT at WOT as well.
I own a MAFT, but I have only used it to try A?F changes very quickly on a dyno. I have always operated as if those changes will get learned out in the next 100-200 miles (which they have).
The only way the MAF differentiates between base and WOT is the frequency output from the MAF, whihc I think it changes at 8000 hz (I dont remember exactly).
chris
Re: A question about the MAFT LTFTs only are applied to WOT if you are lean
(+). Otherwise they get set to zero. Trims are
part of closed loop fuel computation, WOT is open
loop.
(+). Otherwise they get set to zero. Trims are
part of closed loop fuel computation, WOT is open
loop.
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Re: A question about the MAFT i'm pretty sure the PCM can't go out of closed loop unless its overheating or needs to reduce engine power. EPA is very tight with time a vehicle is designed to be out of closed loop hence now alot of cars use A/F sensors instead of 02 sensors (due to no warm up time needed).
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