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

 

yes afr read higher on a cold day, the air is more dense, thus more oxygen to burn, raising your AFR.

 

yup as soon as it got cold outside my car started detonating

 

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....

 

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 &raquo;</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?

 

which fuel management systems support the correction factor for the intake temp?

 

AEM EMS was the one i was referring to

 

hMm, I notice this also. Kinda sucks.. UBERDATA should have something for this.. -

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</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

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adseguy &raquo;</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?

 

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.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by synik &raquo;</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

 

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

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by seen4ever &raquo;</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....

 

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

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</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.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</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?

 

cant you just tune your car in the winter, then it will be richer in the summer and fine during the winter.

platinum.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by platinum00 &raquo;</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>

 

I guess I'm gonna have to keep a close look on my wideband this winter when it's -30C.

Gotta love Canadian winters.

lol

 

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.

 

What you could is leave your fuel map as it is and simply turn down the boost.

Who need crazy power in winter?

 

I am aware of this problem, its hard to test the stuffs and not that many people like running experimental code in their turbo hondas

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adseguy &raquo;</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

 

can't you just turn up your fuel pressure a few pounds?