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JusBringIt
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camshaft.
« on: October 27, 2006, 11:12:31 PM » |
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Anyone able to show me what the V6 camshaft looks like? I need it to do some tuning, additional info such as degree of offset for each "cylinder position" would be helpful, if not, just a picture should do. thanks.
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Burn504
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what exactly are you trying to do?
adjust cam timing? a/f tuning?
im kind of confused as to what your goal is from looking at a camshaft
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3.1L supercharged
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Burn504
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a/f tuning.
all you need is a wideband really... Best gauge i have in the car  |
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3.1L supercharged
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JusBringIt
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thats a pretty good idea, i never knew about that. i also wanted to check something additional, that is, the optimal tb/manifold port size.
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greg
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what does the wideband 02 sensor do anyway? their like over 300 bucks.  |
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Sebring96man
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Wideband allows you to tune your air/fuel ratio. It is nessesary if you get an SAFC to tune your car.
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Sroufe7
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It give you the air/fuel ratio. Stock O2's can only read up to 1 volt and wideband ones read much higher. It's the same gauge that they use in dyno shops to show your a/f ratio and it's really the one way to tune a car.
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JusBringIt
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optimum ratio i read is supposed to be 14.5:1. what is the best general ratio for a stock sebring/avenger? i believe due to slight variances in engine/upgrades it might be slightlydifferent.
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Burn504
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optimal is 14.7:1 which is stoich.
its not like you set the car for 14.7 or another number and go...
it varies per load(which can include throttle percentage which is relevant to load).. and rpm as to what a/f ratio you will want.
like anytime you are in closed loop.. the computer should be aiming to keep you at 14.7:1. But as with anytime you are in closed loop the ecu is constantly compensating give you an average of 14.7:1. That is why your o2 sensor signal oscilates.
open loop tuning which is where the wideband really makes itself worth something... is when you are 80%+ on the throttle... basically full throttle. On a N/A engine you are going to want to be somewhere between 12-13:1 during this time. But its not a constant 12:1.. it may start leaner at lower rpms... and go richer at high rpms. Those are things for you to decide when you are tuning.
I could ramble on and on about that question because it is just soo generic. There are so many things that go into deciding where to set your A/f and they can be results of detonation, temp, weather...
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3.1L supercharged
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JusBringIt
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optimal is 14.7:1 which is stoich.
its not like you set the car for 14.7 or another number and go...
it varies per load(which can include throttle percentage which is relevant to load).. and rpm as to what a/f ratio you will want.
like anytime you are in closed loop.. the computer should be aiming to keep you at 14.7:1. But as with anytime you are in closed loop the ecu is constantly compensating give you an average of 14.7:1. That is why your o2 sensor signal oscilates.
open loop tuning which is where the wideband really makes itself worth something... is when you are 80%+ on the throttle... basically full throttle. On a N/A engine you are going to want to be somewhere between 12-13:1 during this time. But its not a constant 12:1.. it may start leaner at lower rpms... and go richer at high rpms. Those are things for you to decide when you are tuning.
I could ramble on and on about that question because it is just soo generic. There are so many things that go into deciding where to set your A/f and they can be results of detonation, temp, weather...
if u were any more confusing i would bang my head against the computer desk. |
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Burn504
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if you knew half of something about tuning you would understand...
closed loop.... the ecu is trying to hold it at stoich. it does it for you as long as you arent too far off(like boost or anything where you would change the displacement or injector size. so you dont tune closed loop.... you are tuning the fuel trims. Thats what you need to be checking when making changes for closed loop operation
open loop. the car runs off of a preset tune for the most part. The ecu is not paying attention to the o2 sensors for feedback. So you can make changes here and it wont be trying to compensate for your changes.
There is no magical number for a/f. There is parameters you try and stay within, but you will always run into people that run richer or leaner than you for their own personal reasons.
14.7:1 is stoich...
when full throttle you will want to stay under 12.5:1 if you have a a/s stock motor...
boosted its gonna drop to around 11:1
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3.1L supercharged
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JusBringIt
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gotcha..i just didnt understand ur terminology. u learn something new everyday.
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