A/F ratio question
- Thread starter amtrucker22
- Start date
14.7 is stoich so your good there alittle rich on the 75mph.
Tooloe
Full Access Member
yup i get the same thing what an A/F gauge does it searchs for stoich.. until you go WOT.... you get your real A/F Ratio reading at WOT.... mine does the same thing yours is doing!
I dont agree...unless I am misunderstanding your 70 & 75 MPH were staying in the 16s....TOO LEAN........your 45mph was slightly rich in the low 14s.......mine bounces between 14.3 to 15.5 at any speed other than WOT..
FSTJACK
Full Access Member
TNVIPER said:
Your AFRs are right on the money.
He should listen to you about his.
Rich down low, leans out at higher RPMS.
TNVIPER said:
Ditto!
RedSrt007
Active Member
don't worry about your a/fs @ cruise unless your drastically off...
amtrucker22
Active Member
I am inbetween 13-14 on WOT. Should I send Roe a message to get a modified tune (this is his tune on the truck).
Thanks
Thanks
amtrucker22 said:
13-14 is lean...you should be mid/high 12s......but before you change tunes I would put it on a dyno to get a good reading. The guage you have is same as mine and they are fairly accurate but it is hard to follow a A/F reading while trying to drive at WOT.....your cruise A/Fs may be due to faulty O2 sensors..
paul find a stretch of hwy you can do a third gear roll the best ya can, watch the air/fuel meter, you should be in the 12's or less all the way to redline, anything more get yyour tune modified, cruise doesnt give load readings well, it gives you the accurate reading under full throttle
amtrucker22
Active Member
I dont know if its the camera or me jumping around a bit, but its def lean 14 anything at wot to me is a bit leanamtrucker22 said:
I would get it richened up jsut a tad there bob
With Torrie's tune I'm around 11.8 - 12.1 at wide open throttle. It's either a tune issue. Or like TNVIPER was saying, maybe an oxygen sensor issue. Only wat to find out, is to get it on a dyno. But I wouldn't be doing any WOT runs unitl You find out for sure.
amtrucker22
Active Member
Sounds like a plan... Thanks fellas.
amtrucker22
Active Member
man... good thing I sold my daily driver last weekend
VENOMOUS1 RACING
Has Left the Room - Banned from VTCOA!
Guys I think most of your info is on par, but I want to add a couple things from my experiences. First off cruising A/F is fine to be around Stoich between high 13 and low 15 being 14.7 is stoich with the fuel we use. N/A vehicles I like to see around 12.5-13 WOT, just a little on the rich side. Idle should be around the Stoich mark as well. The idea of starting rich and ending lean is not quite true. The ECM has almost infinite tables and cells for correcting and tuning a certain spot in the rpm band. If it's a little rich at 5K you can lean it out some. If it's to lean at 5100 rpm you can adjust for that. You want to log the data and see how your ECm is reacting. Does it show knock retard anywhere through the pull? Timing can also be adjusted for each cell and if there is some kind of detonation it can be fattened up in that cell and surrounding cells to alleviate the problem.
The O2 sensors are not playing a part in tuning during WOT as you are running open loop during this time as in intitial startup. In other word it is using preset parameters at WOT vs correcting in closed loop via O2 sensors and other sensor readings. Your idle after warmup and cruising is handled closed loop and adjusted by the ECM.
The O2 sensors are not playing a part in tuning during WOT as you are running open loop during this time as in intitial startup. In other word it is using preset parameters at WOT vs correcting in closed loop via O2 sensors and other sensor readings. Your idle after warmup and cruising is handled closed loop and adjusted by the ECM.
amtrucker22 said:
Don't do it again.
Call Sean immediately and get a tune to fatten up that WOT ratio!
OSO
Full Access Member
Just curious as to where your A/F sensor is located on the exhaust, in front of the cats?amtrucker22 said:
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