What did you set your MAFT at?
Thread Starter
On The Tree
Joined: Aug 2004
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From: Ft.Lauderdale,Fl
What did you set your MAFT at? I have a '98 A-4 and added a set of LT's and an ORY. The car is running rich and my brother had a MAFT laying around so I figured I would used it untill I get tune. I know a MAFT is just a tempory fix. What setting did you use to lean it out to offset the rich condition caused by the headers? I just want to see what work for other people to get me in the ball park for a couple weeks.Thanks for the help.
If you're using it to fix an O2 sensor problem then
you are chasing a ghost.
If you have proper fuel trimming and things are
stable then you probably want to leave base alone
and go about -8% on the WOT wheel (trying to get
from about 11.7:1 commanded, to 12.7:1 AFR
commanded).
But knowing -why- the current rich condition, and
how much / how consistent, would help you a lot.
you are chasing a ghost.
If you have proper fuel trimming and things are
stable then you probably want to leave base alone
and go about -8% on the WOT wheel (trying to get
from about 11.7:1 commanded, to 12.7:1 AFR
commanded).
But knowing -why- the current rich condition, and
how much / how consistent, would help you a lot.
Thread Starter
On The Tree
Joined: Aug 2004
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From: Ft.Lauderdale,Fl
I dont have rear o2's anymore. Everything I read says with headers an an ory the car will be pig rich....The car feels like a dog......I doesnt seems like I picked up anything from the headers. ( I may have but It doesnt feel like much) I will dial in the afr when I get a tune but I want to wait untill I put a cam in it before I get a tune. I have the MAFT for free so I figure I could use for a little while. I figured other people have done the same. I will try the -8% on wot and see how it works. I figure plenty of people have used this of offset the rich condition from the headers and if enough people let me know what worked for them I could get my car in the ball park. Thanks for the help.
Thread Starter
On The Tree
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From: Ft.Lauderdale,Fl
Originally Posted by Blacker
When I had my MAFT, I had the base 10% lean and WOT 4% Rich. It netted me 13.2:1 on the dyno.
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From: Live Oak, FL - in the woods where the creatures lurk.
I've thought about using a MAFT since I put headers on, since I don't have easy access to tuning.
I think you really need to log some data with a scanner to dial these things in,every car responds a little differently.
FWIW, mine is fairly rich at idle, the LTFTs run anywhere from +1 to +5 at cruising speed, and the O2s run from .910 - .920 @ WOT. And my gas mileage has dropped some.
I'll be watching to see how it works out for ya, I might try one.
I think you really need to log some data with a scanner to dial these things in,every car responds a little differently.
FWIW, mine is fairly rich at idle, the LTFTs run anywhere from +1 to +5 at cruising speed, and the O2s run from .910 - .920 @ WOT. And my gas mileage has dropped some.
I'll be watching to see how it works out for ya, I might try one.
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On The Tree
Joined: Aug 2004
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From: Ft.Lauderdale,Fl
Originally Posted by gwj
I've thought about using a MAFT since I put headers on, since I don't have easy access to tuning.
I think you really need to log some data with a scanner to dial these things in,every car responds a little differently.
FWIW, mine is fairly rich at idle, the LTFTs run anywhere from +1 to +5 at cruising speed, and the O2s run from .910 - .920 @ WOT. And my gas mileage has dropped some.
I'll be watching to see how it works out for ya, I might try one.
I think you really need to log some data with a scanner to dial these things in,every car responds a little differently.
FWIW, mine is fairly rich at idle, the LTFTs run anywhere from +1 to +5 at cruising speed, and the O2s run from .910 - .920 @ WOT. And my gas mileage has dropped some.
I'll be watching to see how it works out for ya, I might try one.
Thread Starter
On The Tree
Joined: Aug 2004
Posts: 108
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From: Ft.Lauderdale,Fl
It rained friday night so I did not go to the track.......also my brother went out of town so I couldnt do any logging.....no luck this weekend but i'll post up as soon as I can with some results.
Originally Posted by My'98-Z
what were you mods when you had to set it to 4% rich at WOT. I would think you would have to go lean it out if you have headers?
