Really High LTFTs
#1
Senior Member
Thread Starter
Really High LTFTs
I did some datalogging today and noticed my LTFT is really high, ranging between 8 - 18%. Im running a Trifecta tune along with a AEM cold air intake and a ZZP catted downpipe.
Also noticed that my AFR is really high (runs lean), which seems to be atypical of a Trifecta tune.
How bad is this for the health of my engine? Is there any way to correct this without retuning?
Thanks for any help.
Also noticed that my AFR is really high (runs lean), which seems to be atypical of a Trifecta tune.
How bad is this for the health of my engine? Is there any way to correct this without retuning?
Thanks for any help.
#3
Senior Member
Thread Starter
This Trifecta tune is tailored for an AEM cai, supposedly. I do not have the stock intake.
I did more research and supposedly there could be a vacuum leak? Anybody care to post a vacuum diagram?
Thanks
I did more research and supposedly there could be a vacuum leak? Anybody care to post a vacuum diagram?
Thanks
#6
trifecta ran rich with the a/f ratio. but they were always lean with the trims. the ecp tune was always pretty rich though with the trims. my trims, and I asked vince to get them better, but he said they were good. were +7 with the normal tune and -7 with the ecp tune on the k04. not even gonna get started on their attempt to tune the zfr with my bigger injectors
#7
Senior Member
Thread Starter
As far as I know, this is a tailor made tune (the previous owner of the car bought the tune, not me).
I logged the AFR and it seems to run lean most of the time as well, rarely dipping below 14.7, even under boost.
How bad will it be if I keep driving the car? I prefer Trifecta for the select-a-tune feature which is useful for my long commute to work.
I sent WOT Tuning an email, hopefully they'll have things sorted monday.
I logged the AFR and it seems to run lean most of the time as well, rarely dipping below 14.7, even under boost.
How bad will it be if I keep driving the car? I prefer Trifecta for the select-a-tune feature which is useful for my long commute to work.
I sent WOT Tuning an email, hopefully they'll have things sorted monday.
#8
As far as I know, this is a tailor made tune (the previous owner of the car bought the tune, not me).
I logged the AFR and it seems to run lean most of the time as well, rarely dipping below 14.7, even under boost.
How bad will it be if I keep driving the car? I prefer Trifecta for the select-a-tune feature which is useful for my long commute to work.
I sent WOT Tuning an email, hopefully they'll have things sorted monday.
I logged the AFR and it seems to run lean most of the time as well, rarely dipping below 14.7, even under boost.
How bad will it be if I keep driving the car? I prefer Trifecta for the select-a-tune feature which is useful for my long commute to work.
I sent WOT Tuning an email, hopefully they'll have things sorted monday.
#9
Platinum Member
Platinum Member
As far as I know, this is a tailor made tune (the previous owner of the car bought the tune, not me).
I logged the AFR and it seems to run lean most of the time as well, rarely dipping below 14.7, even under boost.
How bad will it be if I keep driving the car? I prefer Trifecta for the select-a-tune feature which is useful for my long commute to work.
I sent WOT Tuning an email, hopefully they'll have things sorted monday.
I logged the AFR and it seems to run lean most of the time as well, rarely dipping below 14.7, even under boost.
How bad will it be if I keep driving the car? I prefer Trifecta for the select-a-tune feature which is useful for my long commute to work.
I sent WOT Tuning an email, hopefully they'll have things sorted monday.
As far as your trims go. Either the tune needs to be dialed in much better or you have an issue.
#10
Senior Member
Thread Starter
Roughly 14.7 is where you should to be when you're cruising, even up to around 10psi. Shoot, when the car enters DFCO you'll see upwards of 20:1afr. The only time you'll go much richer is under hard acceleration and WOT. If you start seeing 14.7 under those conditions, then you'll have to worry. Maybe I take this stuff for granted, but I though this was pretty common knowledge for most car modding enthusiasts.
As far as your trims go. Either the tune needs to be dialed in much better or you have an issue.
As far as your trims go. Either the tune needs to be dialed in much better or you have an issue.
Will a boost leak cause a lean condition? I figured that it would actually do the opposite and make the engine run rich, as the engine will be receiving less air than what was metered.
#13
Senior Member
Thread Starter
Trying to get a hold of SSKev at the moment. He's the only one around here.
I guess the risk of running stoic at WOT is melted pistons right? I am not getting any KR fortunately.
I guess the risk of running stoic at WOT is melted pistons right? I am not getting any KR fortunately.
#14
Senior Member
Thread Starter
Before I get retuned, are there basic diagnostic measures I should take to rule out trivial issues?
I plan on cleaning the MAF to see if that will help.
I plan on cleaning the MAF to see if that will help.
#15
#16
Senior Member
Thread Starter
Recently I reset my battery and my LTFT stays around 0 during idle. The LTFT rises to +7 after driving around, and seems to stick there more or less.
Just noticed that my AFR's do in fact go down to about 12.X while at WOT. But during cruise and mild boost regimes, I'm seeing high 14's to low 15's.
The car seems to drive excellent, and makes enough torque that the clutch will slip in 5th going about 100 km/h and WOT.
I don't feel like paying for a retune in the mean time. What kind of problems will I experience if I ignore this?
Just noticed that my AFR's do in fact go down to about 12.X while at WOT. But during cruise and mild boost regimes, I'm seeing high 14's to low 15's.
The car seems to drive excellent, and makes enough torque that the clutch will slip in 5th going about 100 km/h and WOT.
I don't feel like paying for a retune in the mean time. What kind of problems will I experience if I ignore this?
#17
Recently I reset my battery and my LTFT stays around 0 during idle. The LTFT rises to +7 after driving around, and seems to stick there more or less.
Just noticed that my AFR's do in fact go down to about 12.X while at WOT. But during cruise and mild boost regimes, I'm seeing high 14's to low 15's.
The car seems to drive excellent, and makes enough torque that the clutch will slip in 5th going about 100 km/h and WOT.
I don't feel like paying for a retune in the mean time. What kind of problems will I experience if I ignore this?
Just noticed that my AFR's do in fact go down to about 12.X while at WOT. But during cruise and mild boost regimes, I'm seeing high 14's to low 15's.
The car seems to drive excellent, and makes enough torque that the clutch will slip in 5th going about 100 km/h and WOT.
I don't feel like paying for a retune in the mean time. What kind of problems will I experience if I ignore this?
This makes me cringe, don't do that, down shift to 4th. Also a stock LNF would probably slip the clutch doing that.
#21
Senior Member
iTrader: (6)
Recently I reset my battery and my LTFT stays around 0 during idle. The LTFT rises to +7 after driving around, and seems to stick there more or less.
Just noticed that my AFR's do in fact go down to about 12.X while at WOT. But during cruise and mild boost regimes, I'm seeing high 14's to low 15's.
The car seems to drive excellent, and makes enough torque that the clutch will slip in 5th going about 100 km/h and WOT.
I don't feel like paying for a retune in the mean time. What kind of problems will I experience if I ignore this?
Just noticed that my AFR's do in fact go down to about 12.X while at WOT. But during cruise and mild boost regimes, I'm seeing high 14's to low 15's.
The car seems to drive excellent, and makes enough torque that the clutch will slip in 5th going about 100 km/h and WOT.
I don't feel like paying for a retune in the mean time. What kind of problems will I experience if I ignore this?
#23
Senior Member
Thread Starter
Also, thank you everyone for the heads up about going WOT in 5th. I come from low powered cars and do it all the time without consequence. It makes plenty of sense though.
Last edited by LTBALTBMX; 05-27-2015 at 08:04 PM.
#24
Senior Member
iTrader: (6)
When you disconnect the EVAP solenoid if locks the LTFT at 0.0, then the only adjustments are made with the STFT based off the wideband. Most of the time the LNF likes it better disconnected, also the LTFT is global for the e69 which is not that good of an idea and still unsure of why they selected this since the LSJ (iirc P12) ecu has 12 different LTFT depending on load and RPM
#25
Senior Member
Thread Starter
When you disconnect the EVAP solenoid if locks the LTFT at 0.0, then the only adjustments are made with the STFT based off the wideband. Most of the time the LNF likes it better disconnected, also the LTFT is global for the e69 which is not that good of an idea and still unsure of why they selected this since the LSJ (iirc P12) ecu has 12 different LTFT depending on load and RPM
I'm not having any driveability issues, but I'll disconnect it to see how things go. My evap can't pass emissions for **** anyways, lol