running rich in hot weather?
#1
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Thread Starter
running rich in hot weather?
Is it normal to run a bit richer on hot weather? I was driving today and I noticed my WB gauge showing 11:2 at wot. When i dialed my car a/f ratio was a cool day.
TIA
Lart
TIA
Lart
#2
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
air is less dense the warmer it gets. If you set it on a cool day, and it is now almost 100F there, there should be a difference. How much? Not sure. Mine does it too.
#3
Addict
Rennlist Member
Rennlist Member
Cold weather means denser air and leaner AFR's. An older BMWCCA and SSCA racer/builder told me he always tunes the car for the coldest tracks he will run in, to prevent burning a valve or worse.
#4
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Thread Starter
Originally Posted by ehall
air is less dense the warmer it gets. If you set it on a cool day, and it is now almost 100F there, there should be a difference. How much? Not sure. Mine does it too.
#5
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Thread Starter
Originally Posted by eclou
Cold weather means denser air and leaner AFR's. An older BMWCCA and SSCA racer/builder told me he always tunes the car for the coldest tracks he will run in, to prevent burning a valve or worse.
#7
Originally Posted by danny951
Would a 951 with a MAF sensor and correct chips be able to correct for the denser air on a cold day and supply more fuel to the mixture?
This has been seen on at least 50 datalogs.
Trending Topics
#9
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Thread Starter
Originally Posted by special tool
Yes the Vitesse system on my car compensates 100%.
This has been seen on at least 50 datalogs.
This has been seen on at least 50 datalogs.
#11
That Guy
Rennlist Member
Rennlist Member
Originally Posted by lart951
My Lindsey racing digital MAF is has the air temp. sensor but I guess is not working?
#12
Addict
Rennlist Member
Rennlist Member
I've also noticed richer A/F ratios in hot weather. I originally tuned my A/F ratios in summer weather. I then found that in New England winter conditions I was running too lean under WOT. I retuned the A/F for cold weather but now I run too rich in the summer.
That's one reason I've decided to try a Vitesse MAF setup, which is supposed to maintain constant A/F ratios, independent of temperature. I guess the special Vitesse "MAF chip" may have something to do with this. My Vitesse kit should be arriving shortly!
That's one reason I've decided to try a Vitesse MAF setup, which is supposed to maintain constant A/F ratios, independent of temperature. I guess the special Vitesse "MAF chip" may have something to do with this. My Vitesse kit should be arriving shortly!
#13
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Thread Starter
Originally Posted by TurboX
maybe the difference in quality between vitesse and lindsey??
#14
Rennlist Member
Join Date: Oct 2002
Location: Melbourne, Australia
Posts: 1,110
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by lart951
My Lindsey racing digital MAF is has the air temp. sensor but I guess is not working?
#15
Instructor
Join Date: Sep 2004
Location: San Jose, CA
Posts: 165
Likes: 0
Received 0 Likes
on
0 Posts
Quote:
Originally Posted by lart951
My Lindsey racing digital MAF is has the air temp. sensor but I guess is not working?
I have LR maf and Mafterburner, i tuned my car when it was 65° and AFR is 13.8-14.8
nothing much changes when i run at 100°. The only differnece is little rich at idle when it gets hot
it is around 12.8.-13.5@idle.
Originally Posted by lart951
My Lindsey racing digital MAF is has the air temp. sensor but I guess is not working?
I have LR maf and Mafterburner, i tuned my car when it was 65° and AFR is 13.8-14.8
nothing much changes when i run at 100°. The only differnece is little rich at idle when it gets hot
it is around 12.8.-13.5@idle.