I've noticed whenever I decelerate using the gears with no gas pedal, basically normal downshifting when slowing down, that my mixture is very rich. Is this really necessary? There isn't much load on the engine, and I've heard of people in MPG races even turning their cars off when doing this to save fuel? How would this be modified in our cals? I couldn't find any fuel based on TPS volts or something like that to go by.
Thanks,
JB
I thought on decel, the computer shut off the injectors so save fuel and to stop damaging the cat?
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I'll have to hook up a wideband...
I know what you refer to. Without knowing if I am giving you a tecnically correct answer, have a look at the FuelNoThrottle Table which per default scales very rich (if you don't change it after scaling injectors).
Reducing fuel there towards the green guide line in Chem2 changed my Analog A/F Reading in those moments from Blue to now green/orange. Since it did have an impact on my A/F Reading I am sure you get less fuel this moment, apart from that I was under the same impression as TurbovanMan, that there shouldn't be any injector activity.
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I don't have that table anywhere...I do have FuelEnrichmentFromChargeTemp which has a note to richen upon throttle release. This is the closest I can find to this. What you are describing sounds correct however.
Ok, using Turbonator it would be labled FuelBaselineFromMap, Ladybug lables it as FuelNoThrottle_FromMap and its real name is MAPIDL.
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MPGMikes thread mentions fuel being added to feed the converter. I have seen this mentioned a few other times.
does it pop? then it doesn't cut fuel in hard vacuum.Originally Posted by turbovanman
This is for a SBEC, which might be why it's different...it doesn't go rich if I put the clutch in, only if I leave it in gear with my foot off the gas to slow down.
My wideband says I run lean, if I left the gas go and coast in gear.
Using Ladybug 6.0
On my standalone, I set all fuel values past 19mm/hg to 0 and this eliminated popping on loaded decel.
on my smec which uses Rob's old calibration i also set the Fuel no throttle table to 0 over 22" of vacuum since the car idles at 20-21"
All the factory cals I've seen have just a hair of fuel on decel still. Not sure why. You should look at a S60 calibration. At 10" of vac or so they just straightline the fuel. Probably runs 12.0:1 or richer on decel
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