AFC and stuff....
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From: ok, USA
AFC and stuff....
Alright, after getting the car dynoed, and seeing that I run very rich above 4500rpm.
THIS IS A NON-VTEC car. 1992 Acura Legend 3.2L V6 5 speed manual.
I would like to fix this somehow, because thats probably a reason my torque drops off so fast. For those of you that have them, or have used them. Is this the best option to fix my A/F ratio? And if so, what is the best one I can buy for my application. (nothing too crazy, just something that will let me adjust it at each 500rpm or something like that)
I really want to do something about it, because I am going to have a bayou chip at some point, and I know that will just put more fuel in there, so it may even hurt things, instead of helping.
One of my friends said it would be best to have ~14.5 a/f ratio, and as you can see, mine just drops after 4500. it stays pretty close the rest of the way though.
Other than buying an AFC, what other options are there to fix something like this?
THIS IS A NON-VTEC car. 1992 Acura Legend 3.2L V6 5 speed manual.
I would like to fix this somehow, because thats probably a reason my torque drops off so fast. For those of you that have them, or have used them. Is this the best option to fix my A/F ratio? And if so, what is the best one I can buy for my application. (nothing too crazy, just something that will let me adjust it at each 500rpm or something like that)
I really want to do something about it, because I am going to have a bayou chip at some point, and I know that will just put more fuel in there, so it may even hurt things, instead of helping.
One of my friends said it would be best to have ~14.5 a/f ratio, and as you can see, mine just drops after 4500. it stays pretty close the rest of the way though.
Other than buying an AFC, what other options are there to fix something like this?
Re: AFC and stuff.... (RangerJoe)
It's the other way around.
The real reason your torque drops off so quickly above 4500 rpm is b/c the cams don't breathe that well above that point. That's the very same reason why the AFR's are starting to richen up. The torque curve is an indicator of how well the engine is breathing at any particular rpm. Note how the AFR's start to fall just as the torque curve begins to droop a little and then sags like a 90 year old tit after 5300rpm.
It's not a VTEC motor, so the torque curve is not as wide.
An AFC should be just fine to take out some fuel and add a little ignition timing above 4500rpm.
Leave yourself a margin of safety...no leaner than 14.0:1, but 13.7:1 is better to keep it safe and within reason for changes of season.
The real reason your torque drops off so quickly above 4500 rpm is b/c the cams don't breathe that well above that point. That's the very same reason why the AFR's are starting to richen up. The torque curve is an indicator of how well the engine is breathing at any particular rpm. Note how the AFR's start to fall just as the torque curve begins to droop a little and then sags like a 90 year old tit after 5300rpm.
It's not a VTEC motor, so the torque curve is not as wide.
An AFC should be just fine to take out some fuel and add a little ignition timing above 4500rpm.
Leave yourself a margin of safety...no leaner than 14.0:1, but 13.7:1 is better to keep it safe and within reason for changes of season.
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