air/fuel ratio questions
09-05-2007, 02:10 PM
#11
6th Gear Member
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: air/fuel ratio questions
ORIGINAL: 86GreenMachine
Would running 94 octane ,front mount intercooler ,and methanol injection be for 13-14.5??
Would running 94 octane ,front mount intercooler ,and methanol injection be for 13-14.5??
09-05-2007, 02:13 PM
#12
6th Gear Member
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: air/fuel ratio questions
ORIGINAL: sprayed306
Well not sure how accurate the gauge is or how to calibrate it but its a brand new AEM gauge with sensor mounted next to the factory o2.Mods.306 9.5 compresion,255lph FP,afr 185's,comp cam 555/565,elde rpm2 intake,24lb,inj,pmas 75mm,70mm tb,bbk afpr,headers,o/r h pipe,2 chamber flows,1.6 rr's,4 10'sand thats about it.At idle it jumps from 16.0-18.0+ and pegs the gauge and normal driving on the highway 2400 rpm@ 70mph it jumps around 15.9-17.0.I have checked codes,balance test and everything passed.
ORIGINAL: samseed101
Hey, some of us need to work! LoL [8D]
Holy ****, 15.2 at WOT? That's lean... REAL lean. I'd stay off the throttle until you can fix this issue. First things first, what's your full mod list, right down to the fuel pump. Also, are you sure your gauge is accurate and are you sure the wideband is calibrated properly? What's the AFR at idle and under normal driving conditions?
Hey, some of us need to work! LoL [8D]
Holy ****, 15.2 at WOT? That's lean... REAL lean. I'd stay off the throttle until you can fix this issue. First things first, what's your full mod list, right down to the fuel pump. Also, are you sure your gauge is accurate and are you sure the wideband is calibrated properly? What's the AFR at idle and under normal driving conditions?
What's the make / model of your wideband controller.
09-05-2007, 02:16 PM
#13
6th Gear Member
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: air/fuel ratio questions
ORIGINAL: Curlytop
oh samseed is on his "A" game. i can't keep it on memory like that "bro". i'm a shedtree mech. show me something once and i'll have it down. i've been around fast cars my whole life. i can only talk about what i have experience. trail and error and plenty of error. however, this dude know his s##t.
oh samseed is on his "A" game. i can't keep it on memory like that "bro". i'm a shedtree mech. show me something once and i'll have it down. i've been around fast cars my whole life. i can only talk about what i have experience. trail and error and plenty of error. however, this dude know his s##t.
If I hadn't done it for awhile, I'd lose it too. This crap gets so damned complicated that it's easy to forget some of the stuff. Just like anything else... use it or lose it.
09-05-2007, 02:19 PM
#14
Thread Starter
Join Date: Aug 2007
Location:
Posts: 45
RE: air/fuel ratio questions
ORIGINAL: samseed101
I'd be curious to see what your short term and long term fuel trims look like. Strictly going by what you are saying here, I'm thinking that your wideband either isn't reading properly or isn't calibrated properly. Either that or you're REAL lean, but if that were the case your fuel trims should be able to bring that back into a more acceptable range when in Closed Loop.
What's the make / model of your wideband controller.
ORIGINAL: sprayed306
Well not sure how accurate the gauge is or how to calibrate it but its a brand new AEM gauge with sensor mounted next to the factory o2.Mods.306 9.5 compresion,255lph FP,afr 185's,comp cam 555/565,elde rpm2 intake,24lb,inj,pmas 75mm,70mm tb,bbk afpr,headers,o/r h pipe,2 chamber flows,1.6 rr's,4 10'sand thats about it.At idle it jumps from 16.0-18.0+ and pegs the gauge and normal driving on the highway 2400 rpm@ 70mph it jumps around 15.9-17.0.I have checked codes,balance test and everything passed.
ORIGINAL: samseed101
Hey, some of us need to work! LoL [8D]
Holy ****, 15.2 at WOT? That's lean... REAL lean. I'd stay off the throttle until you can fix this issue. First things first, what's your full mod list, right down to the fuel pump. Also, are you sure your gauge is accurate and are you sure the wideband is calibrated properly? What's the AFR at idle and under normal driving conditions?
Hey, some of us need to work! LoL [8D]
Holy ****, 15.2 at WOT? That's lean... REAL lean. I'd stay off the throttle until you can fix this issue. First things first, what's your full mod list, right down to the fuel pump. Also, are you sure your gauge is accurate and are you sure the wideband is calibrated properly? What's the AFR at idle and under normal driving conditions?
What's the make / model of your wideband controller.
09-05-2007, 02:37 PM
#15
6th Gear Member
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: air/fuel ratio questions
ORIGINAL: sprayed306
Its a A.E.M 30-4100. i bought this gauge from jegs and it came with no instructions so i dont know if i can calibrate it.[:@] thanks for the help so far
Its a A.E.M 30-4100. i bought this gauge from jegs and it came with no instructions so i dont know if i can calibrate it.[:@] thanks for the help so far
Edited to add: of course, it's also a good idea to check out all of the instructions to make sure it is wired properly.
09-05-2007, 03:06 PM
#16
Thread Starter
Join Date: Aug 2007
Location:
Posts: 45
RE: air/fuel ratio questions
ORIGINAL: samseed101
Check out this link here. It's the instructions for your wideband. Towards the bottom, you will see it mention calibeations. it will refer to the different calibrations as well out output voltage, etc (selected by turning a screw.) Make sure that it is set properly.
Edited to add: of course, it's also a good idea to check out all of the instructions to make sure it is wired properly.
ORIGINAL: sprayed306
Its a A.E.M 30-4100. i bought this gauge from jegs and it came with no instructions so i dont know if i can calibrate it.[:@] thanks for the help so far
Its a A.E.M 30-4100. i bought this gauge from jegs and it came with no instructions so i dont know if i can calibrate it.[:@] thanks for the help so far
Edited to add: of course, it's also a good idea to check out all of the instructions to make sure it is wired properly.
09-05-2007, 04:19 PM
#19
6th Gear Member
Join Date: Jun 2006
Location: Maine
Posts: 5,693
RE: air/fuel ratio questions
If you don't know what LAMBDA is and don't want to use it (most people don't) then you'll want to use P0. That will give you your AFR. That should be linear. In other words, 0v = an AFR of 10:1, 1v = 12, 2v = 14, etc.. That's typically how they go... all the way up to 20.0:1.
I guess it's possible that you really are running that lean, but it seems unusual. I may have missed it before, but what's your fuel pressure with the vacuum off?
If I could see datalogs or something like that, then i could tell right away. I'm still leaning towards the fact that you're not really that lean and it's a gauge issue or a sensor issue. If you can, just for te hell of it remove your stock narrowband sensor on the opposite side and run this sensor in that bung for a short period of time. For the first 30 sec or so you are running in closed loop anyway and the car won't be reading the O2 sensors. But as soon as it goes to closed loop, expect the car to run like **** this way
I'm just curious what it reads in a different position.
I guess it's possible that you really are running that lean, but it seems unusual. I may have missed it before, but what's your fuel pressure with the vacuum off?
If I could see datalogs or something like that, then i could tell right away. I'm still leaning towards the fact that you're not really that lean and it's a gauge issue or a sensor issue. If you can, just for te hell of it remove your stock narrowband sensor on the opposite side and run this sensor in that bung for a short period of time. For the first 30 sec or so you are running in closed loop anyway and the car won't be reading the O2 sensors. But as soon as it goes to closed loop, expect the car to run like **** this way
I'm just curious what it reads in a different position.
09-05-2007, 04:33 PM
#20
Thread Starter
Join Date: Aug 2007
Location:
Posts: 45
RE: air/fuel ratio questions
ORIGINAL: samseed101
If you don't know what LAMBDA is and don't want to use it (most people don't) then you'll want to use P0. That will give you your AFR. That should be linear. In other words, 0v = an AFR of 10:1, 1v = 12, 2v = 14, etc.. That's typically how they go... all the way up to 20.0:1.
I guess it's possible that you really are running that lean, but it seems unusual. I may have missed it before, but what's your fuel pressure with the vacuum off?
If I could see datalogs or something like that, then i could tell right away. I'm still leaning towards the fact that you're not really that lean and it's a gauge issue or a sensor issue. If you can, just for te hell of it remove your stock narrowband sensor on the opposite side and run this sensor in that bung for a short period of time. For the first 30 sec or so you are running in closed loop anyway and the car won't be reading the O2 sensors. But as soon as it goes to closed loop, expect the car to run like **** this way
I'm just curious what it reads in a different position.
If you don't know what LAMBDA is and don't want to use it (most people don't) then you'll want to use P0. That will give you your AFR. That should be linear. In other words, 0v = an AFR of 10:1, 1v = 12, 2v = 14, etc.. That's typically how they go... all the way up to 20.0:1.
I guess it's possible that you really are running that lean, but it seems unusual. I may have missed it before, but what's your fuel pressure with the vacuum off?
If I could see datalogs or something like that, then i could tell right away. I'm still leaning towards the fact that you're not really that lean and it's a gauge issue or a sensor issue. If you can, just for te hell of it remove your stock narrowband sensor on the opposite side and run this sensor in that bung for a short period of time. For the first 30 sec or so you are running in closed loop anyway and the car won't be reading the O2 sensors. But as soon as it goes to closed loop, expect the car to run like **** this way
I'm just curious what it reads in a different position.