Cold weather tuning.....are higher a/f's normal?
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Cold weather tuning.....are higher a/f's normal?
So I've got my car turboed for 1k miles now. Running really strong and feals great. Just today the weather was very cold in to 20 degrees F. Great for a turbo car! I noticed on my wideband digital display the A/F's were a good deal higher then normal throughout the RPM and powerband. Normally in boost I was in the 11.4-12.2 range and today it was in the 11.8-12.6 range. In partial throttle I would cruise a whole .5 higher.
I thought to my self this might be normal because I am sucking in denser air.....am I right?
Should i adjust my fuel values so that I go back to my a/f's before or not since the air is colder I reduce chances of detonation? Thanks for any informed comments
I thought to my self this might be normal because I am sucking in denser air.....am I right?
Should i adjust my fuel values so that I go back to my a/f's before or not since the air is colder I reduce chances of detonation? Thanks for any informed comments
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Re: Cold weather tuning.....are higher a/f's normal? (adseguy)
yes afr read higher on a cold day, the air is more dense, thus more oxygen to burn, raising your AFR.
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Re: Cold weather tuning.....are higher a/f's normal? (adseguy)
if the engine management software has a correction factor for the intake temp, i would toy with that instead of changing your fuel map.
however, hondata u can not change, which sucks....
however, hondata u can not change, which sucks....
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Re: Cold weather tuning.....are higher a/f's normal? (Mase)
Hmmm. Yeah I'm running the UberofData and I don't think there is an option for that.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue »</TD></TR><TR><TD CLASS="quote">yup as soon as it got cold outside my car started detonating </TD></TR></TABLE>
That is bad I would have thought I would be ok since the cold air temps means you can run a little higher A/F's so everything just works out on it's own. So should I change my fuel values?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue »</TD></TR><TR><TD CLASS="quote">yup as soon as it got cold outside my car started detonating </TD></TR></TABLE>
That is bad I would have thought I would be ok since the cold air temps means you can run a little higher A/F's so everything just works out on it's own. So should I change my fuel values?
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Re: Cold weather tuning.....are higher a/f's normal? (Mase)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase »</TD></TR><TR><TD CLASS="quote">if the engine management software has a correction factor for the intake temp, i would toy with that instead of changing your fuel map.
however, hondata u can not change, which sucks....</TD></TR></TABLE>
hondata kpro has a correction factor. How do I know what values I need to put in? Is there a formula that I can use?
Modified by k20em2 at 3:31 PM 11/26/2004
however, hondata u can not change, which sucks....</TD></TR></TABLE>
hondata kpro has a correction factor. How do I know what values I need to put in? Is there a formula that I can use?
Modified by k20em2 at 3:31 PM 11/26/2004
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Re: Cold weather tuning.....are higher a/f's normal? (adseguy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adseguy »</TD></TR><TR><TD CLASS="quote">So should I change my fuel values? </TD></TR></TABLE>
Curious about this too, would 12.6 be fine?
Curious about this too, would 12.6 be fine?
#11
since you're running uber just go in and add maybe 1% to your boost maps and see where they are...12.0-12.5 should be ok unless you are running way too much timing.
an iat correction sure would be nice in uber, but that's why you have a wideband and are running uber...no problems to change your tune at anytime.
an iat correction sure would be nice in uber, but that's why you have a wideband and are running uber...no problems to change your tune at anytime.
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Re: (synik)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by synik »</TD></TR><TR><TD CLASS="quote">hMm, I notice this also. Kinda sucks.. UBERDATA should have something for this.. - </TD></TR></TABLE>
that would be sweet
that would be sweet
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Re: (Boosted Chemist)
this is why i tune cars to 11.7 during the summer months, so that they will be aroudn 12.2 during the winter. sucks that hondata/uberdata don't have any correction for air temp
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Re: (seen4ever)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by seen4ever »</TD></TR><TR><TD CLASS="quote">this is why i tune cars to 11.7 during the summer months, so that they will be aroudn 12.2 during the winter. sucks that hondata/uberdata don't have any correction for air temp </TD></TR></TABLE>
if its a big temp difference, 11.7 in the summer wont be rich enough....
if its a big temp difference, 11.7 in the summer wont be rich enough....
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Re: (Mase)
don't see why this is such abig deal (for uber users anyway) but then again all my guys are local to me so i guess its sort of a PITA if ur far away and don't do ur own tuning.
either way, just have the tuner burn 2 chips, 1 for "summer" and 1 for "winter" and swap em if/when it gets below XX temp
either way, just have the tuner burn 2 chips, 1 for "summer" and 1 for "winter" and swap em if/when it gets below XX temp
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Re: (Mase)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase »</TD></TR><TR><TD CLASS="quote">
if its a big temp difference, 11.7 in the summer wont be rich enough....</TD></TR></TABLE>
no ****, i had always heard it was right at .5 difference, but then again, i live in KY, it can get to 90 degrees in the summer and -20 degrees in the winter.
guess i'll have to drop them down to 11.5 or so. normally for the people i know are crazy drivers, IE try to do top speed runs, i put them around 11.2:1 with over 1degree/psi of boost coming out up top.
if its a big temp difference, 11.7 in the summer wont be rich enough....</TD></TR></TABLE>
no ****, i had always heard it was right at .5 difference, but then again, i live in KY, it can get to 90 degrees in the summer and -20 degrees in the winter.
guess i'll have to drop them down to 11.5 or so. normally for the people i know are crazy drivers, IE try to do top speed runs, i put them around 11.2:1 with over 1degree/psi of boost coming out up top.
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Re: (Mase)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase »</TD></TR><TR><TD CLASS="quote">
if its a big temp difference, 11.7 in the summer wont be rich enough....</TD></TR></TABLE>
then what do u shoot for?
if its a big temp difference, 11.7 in the summer wont be rich enough....</TD></TR></TABLE>
then what do u shoot for?
#19
Re: (platinum00)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by platinum00 »</TD></TR><TR><TD CLASS="quote">cant you just tune your car in the winter, then it will be richer in the summer and fine during the winter.
platinum.</TD></TR></TABLE>
platinum.</TD></TR></TABLE>
#21
Re: (Mase)
Mase, have you noticed that the temp makes more of an afr change under boost? I run the AEM and used my ait table to correct it but then im super rich at idle and partial throttle(i know closed loop can correct for that but i like to have it perfect). I think it would be helpful to have a 3d ait map because even with the correction I find myself changing the main map for winter/summer.
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Re: Cold weather tuning.....are higher a/f's normal? (adseguy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adseguy »</TD></TR><TR><TD CLASS="quote">Hmmm. Yeah I'm running the UberofData and I don't think there is an option for that.
That is bad I would have thought I would be ok since the cold air temps means you can run a little higher A/F's so everything just works out on it's own. So should I change my fuel values? </TD></TR></TABLE>
the weird thing is that even though i was detonating i still had an afr in the high 11's to high 10's and plenty conservative timing maps. Nobody seems to know whats wrong with my car
That is bad I would have thought I would be ok since the cold air temps means you can run a little higher A/F's so everything just works out on it's own. So should I change my fuel values? </TD></TR></TABLE>
the weird thing is that even though i was detonating i still had an afr in the high 11's to high 10's and plenty conservative timing maps. Nobody seems to know whats wrong with my car