Mapping with a Wideband..
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I think I know the answer to this....
but.
Mapping a car - should it be done purely on the results of a wideband reading?
but.
Mapping a car - should it be done purely on the results of a wideband reading?
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How are you going to map ignition?
with regards to fuelling though, wideband gets you to where you *think* the car wants to be, ie "I reckon 11.5:1 at 2 bar of boost is a good starting point"
Ideally though, you would then look at EGT's as well, like for example Stu was saying Focus RS need to be a lot richer than a cossie in the same circumstance, so you need to be monitoring other things to know that.
with regards to fuelling though, wideband gets you to where you *think* the car wants to be, ie "I reckon 11.5:1 at 2 bar of boost is a good starting point"
Ideally though, you would then look at EGT's as well, like for example Stu was saying Focus RS need to be a lot richer than a cossie in the same circumstance, so you need to be monitoring other things to know that.
#3
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it also doesn't tall you that you are getting the best torque that you possibly could - only that you are in the right area
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
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Originally Posted by lead_foot
Originally Posted by Chip-3Door
Focus RS need to be a lot richer than a cossie in the same circumstance
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Originally Posted by foreigneRS
it also doesn't tall you that you are getting the best torque that you possibly could - only that you are in the right area
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
Im sure most of the guys on here mapping cossies for example, know full well what AFR's are going to work on which spec without needing the dyno again and can get ridiculously close to ideal results just from experience/AFR
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Originally Posted by foreigneRS
Originally Posted by lead_foot
Originally Posted by Chip-3Door
Focus RS need to be a lot richer than a cossie in the same circumstance
#9
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Originally Posted by Chip-3Door
Originally Posted by foreigneRS
it also doesn't tall you that you are getting the best torque that you possibly could - only that you are in the right area
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
Im sure most of the guys on here mapping cossies for example, know full well what AFR's are going to work on which spec without needing the dyno again and can get ridiculously close to ideal results just from experience/AFR
but i suspect the topic starter is asking as he wants to do it himself and doesn't have that experience to rely on
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Originally Posted by foreigneRS
Originally Posted by Chip-3Door
Originally Posted by foreigneRS
it also doesn't tall you that you are getting the best torque that you possibly could - only that you are in the right area
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
imo, only a dyno can do that entirely accurately. although by using a g-meter (or just a time/distance measurement) on a repeatable stretch of road to measure acceleration can give you some idea
Im sure most of the guys on here mapping cossies for example, know full well what AFR's are going to work on which spec without needing the dyno again and can get ridiculously close to ideal results just from experience/AFR
but i suspect the topic starter is asking as he wants to do it himself and doesn't have that experience to rely on
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
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He is actually asking because its what someone else has told him that he does, and he was unsure as to wether that was sufficient (I know as Ive just been chatting to him on MSN about it
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#11
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Originally Posted by Chip-3Door
Originally Posted by foreigneRS
but i suspect the topic starter is asking as he wants to do it himself and doesn't have that experience to rely on ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
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however, I am shorty going to be looking to ruin a cavalier sri 2.0 with megasquirt to start me on the slow learning curve to maybe know something about stuff
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#17
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You put in values you think will be safe as a starting point (based on experience) then you get the AFR's right, then you increase the ignition until you hear det, then you come back a few degrees.
Thats how you do a basic live map anyway.
Things like minimum advance for best torque need rollers, although generally taking timing out till the heat increases (if you have an EGT probe and can hold it on the brakes or similar to load it on a cell for a long time) gets similar results as normally as you move from min advance for best torque you also see an increase in temp
Thats how you do a basic live map anyway.
Things like minimum advance for best torque need rollers, although generally taking timing out till the heat increases (if you have an EGT probe and can hold it on the brakes or similar to load it on a cell for a long time) gets similar results as normally as you move from min advance for best torque you also see an increase in temp
#18
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Just one of the reasons why a rolling road is better than a live map, you can control every situation and hold under any load any speed any gear, can't do that on the road.
Once mapped though you could run purely on egt, so long as you don't make any changes.
tabetha
Once mapped though you could run purely on egt, so long as you don't make any changes.
tabetha
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I've been quite successfully able to hold an engine at a given speed and load on the road as i'm sure most professional tuners have/do...
I think you'd be insane to rely purely on EGT. As with everything, you need as many sources of information as possible to decide what and when there is a problem - relying on one sensor can lead you down the garden path.
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