datalogs LEAN AFR
Re: datalogs LEAN AFR
[QUOTE=32krazy!;758939]
Honestly dont know if the gauge is bad. I am going by research done online. I dont know how to check if its bad. I have described to others what gauge is doing they say its bad.
using the dashdaq you can log iat thru it.
crap tune
It came with car. I am going to make a trip to ATL soon to BuckHead Imports.
no need to replace the inj. just need a decent tune. i ran 550 cc inj. stacked pulleys, sl55 fuel pump and 11.9 afr at wot. it was all in the tune running 5% lt/ft
cars dont fall out of tune unless you change your mods. tunes are updated due to weather conditions or power adders. if you tune for conditions and dont change anything the tune lasts forever
I have not change mods and dont know if the last owner did. I cant get ahold of him. I only got ahold of the previous owner from him. who did the mods.
14.7 to 15 afr during a cruise is normal for closed loop driving. open loop ie: wot needs to be 11.8 to 12.2 . if the gauge is bad why trust it?
crap tune
It came with car. I am going to make a trip to ATL soon to BuckHead Imports.
no need to replace the inj. just need a decent tune. i ran 550 cc inj. stacked pulleys, sl55 fuel pump and 11.9 afr at wot. it was all in the tune running 5% lt/ft
cars dont fall out of tune unless you change your mods. tunes are updated due to weather conditions or power adders. if you tune for conditions and dont change anything the tune lasts forever
I have not change mods and dont know if the last owner did. I cant get ahold of him. I only got ahold of the previous owner from him. who did the mods.
14.7 to 15 afr during a cruise is normal for closed loop driving. open loop ie: wot needs to be 11.8 to 12.2 . if the gauge is bad why trust it?
Re: datalogs LEAN AFR
[QUOTE=austinbarrylee;758940]tests for power at the sensor. test for power at the gauge. if theres power then the gauge is bad or the O2 sensor is bad. if theres no power then you have other issues
Re: datalogs LEAN AFR
Jessie, it is curious that with your mods you would run rich while most folks have a lean issue. If you do not have obdii capability tied into your Zietronix setup, I would suggest buying an inexpensive scanner to check a few basic parameters. Using obdii instead of dedicated sensors will show you what the ecu is seeing. Looking at your ltfts would tell you if you have a faulty injector. Also a very low/high ect signal
Re: datalogs LEAN AFR
[QUOTE=32krazy!;758939]Thanks for the feedback. I guess I will need to get things leaned out a bit during open loop, didn't realize that too rich is also a problem.
Thank you again. From what I read the DashDaq plugs into the zt-2 brain so even if I install it to help log IAT's, would it see what the ECU is seeing to help with checking LTFT and STFT? It does give an exact number on ECT in addition to IAT. Or should I just go with an obdii scanner that can read the LTFT? Would a faulty injector still run AFR's at 14.7 during closed loop? Looking at my data logs from crusing and idling speeds the AFR stays consistent at 14.7. It is strange that I am running so rich with open loop, something is going on.
Jessie, it is curious that with your mods you would run rich while most folks have a lean issue. If you do not have obdii capability tied into your Zietronix setup, I would suggest buying an inexpensive scanner to check a few basic parameters. Using obdii instead of dedicated sensors will show you what the ecu is seeing. Looking at your ltfts would tell you if you have a faulty injector. Also a very low/high ect signal
Re: datalogs LEAN AFR
I have AEM wideband and I am reading very lean. I am going to change my sensor. I have been told the sensors go out on them frequently. WOT I am reading 15-16. Cruising I am reading 14.7 perfect. If you find out information please let me know. I was also thinking about changing fuel pump & injections
Jesse: you have way to much fuel or a timing issue it appears...hard to say without looking at your tune. It looks like you need to pull some fuel as has been stated already but without seeing what your car is running for timing it's hard to say exactually.
Austin: it appears you are suffering from fuel starvation, the first place to look after you verify your gauge is fuel pressure and under WOT. If the pressure drops significantly under WOT you have a weak pump and it needs to be replaced. If it doesn't then you need to see if you can add more fuel via the tune. If you add more fuel during the tune and you have the same results it's time to look at injectors. If you have to replace the stock injectors you might as well put larger ones in. The stock injectors are don't give you much room to play with. The bigger injectors allow you to add more fuel with a lower duty cycle effectively making the injector last longer because it doesn't have to work as hard...if that makes sense.
Re: datalogs LEAN AFR
Open Loop: Car is under wide open throttle or heavy throttle. This is when you want and Air/Fuel in the mid 11's to mid 12's. This is when the ECU ignores signal from the o2 sensors. Car is also in open loop when you start it up, until the o2 sensors heat up.
Closed Loop: Car is being driven under light throttle, just cruising around. This is when the ECU uses the O2 sensor signals to constantly adjust the Air/Fuel in order to reach stoich, 14.7 for gasoline.
I hope this helps clear things up. I intentionally avoided terms like tables, fuel trims, and scaling.
Closed Loop: Car is being driven under light throttle, just cruising around. This is when the ECU uses the O2 sensor signals to constantly adjust the Air/Fuel in order to reach stoich, 14.7 for gasoline.
I hope this helps clear things up. I intentionally avoided terms like tables, fuel trims, and scaling.
Last edited by grip grip; 09-19-2013 at 11:55 AM.
[QUOTE=JesseJamessrt6;759021]
Thanks for the feedback. I guess I will need to get things leaned out a bit during open loop, didn't realize that too rich is also a problem.
Thank you again. From what I read the DashDaq plugs into the zt-2 brain so even if I install it to help log IAT's, would it see what the ECU is seeing to help with checking LTFT and STFT? It does give an exact number on ECT in addition to IAT. Or should I just go with an obdii scanner that can read the LTFT? Would a faulty injector still run AFR's at 14.7 during closed loop? Looking at my data logs from crusing and idling speeds the AFR stays consistent at 14.7. It is strange that I am running so rich with open loop, something is going on.
yes the ecu could pull fuel to compensate and still hit 14.7 closed loop. Too much and you get an out of range code. If you have the dashdaq just look at the trims. A cheap code reader is a great tool to have around for quick checks.
Thanks for the feedback. I guess I will need to get things leaned out a bit during open loop, didn't realize that too rich is also a problem.
Thank you again. From what I read the DashDaq plugs into the zt-2 brain so even if I install it to help log IAT's, would it see what the ECU is seeing to help with checking LTFT and STFT? It does give an exact number on ECT in addition to IAT. Or should I just go with an obdii scanner that can read the LTFT? Would a faulty injector still run AFR's at 14.7 during closed loop? Looking at my data logs from crusing and idling speeds the AFR stays consistent at 14.7. It is strange that I am running so rich with open loop, something is going on.
Re: datalogs LEAN AFR
What other mods are you running with the SL55 pump.?
Re: datalogs LEAN AFR