LEAN vs RICH
Member
Joined: Nov 2006
Posts: 76
Likes: 0
From: Mansfield, PA
How can you tell if your running lean or rich?All i know is that my truck runs slow for alll the expensive mods i have on it. Guys with th 97-03 years have typed in 0-60 times from 7-9 seconds and im running 12.5 on level 3 and about 13 on a custom level 2. God I wish i would have spent the money on troyers tunes.
Senior Member
Joined: Sep 2006
Posts: 109
Likes: 0
From: New Mexico
Originally Posted by bigmark
How can you tell if your running lean or rich?All i know is that my truck runs slow for alll the expensive mods i have on it. Guys with th 97-03 years have typed in 0-60 times from 7-9 seconds and im running 12.5 on level 3 and about 13 on a custom level 2. God I wish i would have spent the money on troyers tunes.
Former Sponsor
Joined: Mar 1998
Posts: 13,385
Likes: 4
From: Virginia
HI bigmark,
In closed loop. you can monitor the fuel trims - this is the percentage of correction the PCM has to make to achieve stoich A/F. This is of course at light throttle light load conditions.
Now in terms of seeing what your A/F ratios are in open loop, what most people think of as WOT (wide-open throttle) but actually applies any time you are in power mode (open loop), for that you need a wideband A/F ratio recorder - I.E., the easiest way is to take it to a dyno.
With regard to your 0-60 times and not being happy with them, if you'd like to give me a call I will be happy to go over all the details of your vehicle and let you know just what you should be able to get out of it, so that you can tell whether what you are experiencing is actually in line or not, OK?
Last - for A/F ratios, I don't like generalizations, what a given vehicle's A/F's should be depends on it's engine, configuration, power levels, forced induction or not, and just how the tuner himself has set various things up - it all gets down to a sustainable EGT that really determines (at least, for a truly knowledgeable & experienced tuner) what the A/F's should be for a given application and type of tune - so there is no one set number in most cases - there are a few exceptions, for example, naturally aspirated 5.0 Mustangs tend to like about 13.0:1 for max sustainable power, a bit richer if top speed runs are going to be made - but there I go violating my own "rules" and quoting a set A/F ratio - again, this should vary depending on the vehicle, power, configuration, type of tune and the tuner himself and what his technique is to keep the combustion chamber temperatures in line so that what you end up with is maximum safe & sustainable power.
In closed loop. you can monitor the fuel trims - this is the percentage of correction the PCM has to make to achieve stoich A/F. This is of course at light throttle light load conditions.
Now in terms of seeing what your A/F ratios are in open loop, what most people think of as WOT (wide-open throttle) but actually applies any time you are in power mode (open loop), for that you need a wideband A/F ratio recorder - I.E., the easiest way is to take it to a dyno.
With regard to your 0-60 times and not being happy with them, if you'd like to give me a call I will be happy to go over all the details of your vehicle and let you know just what you should be able to get out of it, so that you can tell whether what you are experiencing is actually in line or not, OK?
Last - for A/F ratios, I don't like generalizations, what a given vehicle's A/F's should be depends on it's engine, configuration, power levels, forced induction or not, and just how the tuner himself has set various things up - it all gets down to a sustainable EGT that really determines (at least, for a truly knowledgeable & experienced tuner) what the A/F's should be for a given application and type of tune - so there is no one set number in most cases - there are a few exceptions, for example, naturally aspirated 5.0 Mustangs tend to like about 13.0:1 for max sustainable power, a bit richer if top speed runs are going to be made - but there I go violating my own "rules" and quoting a set A/F ratio - again, this should vary depending on the vehicle, power, configuration, type of tune and the tuner himself and what his technique is to keep the combustion chamber temperatures in line so that what you end up with is maximum safe & sustainable power.