OpenFlash Tablet: OTS v2.0 Beta (132 new maps, 12 new XMLs) Available for Download

[steve99]

Originally Posted by smellslikecurry

Yes I did. Thanks for all your help in this thread!

Going to try that out. I was just curious if the car was safe to drive for now. It's the only car I have access to for the week.

log look reasonable fuel trims high, but afr looks ok. Drive sedately should be ok for short city runs.

Check you have both O2 sensor plugs seated all the way and the black/grey (on out model anyway) 02 plugs not switched

[k.houan]

Originally Posted by steve99

looks fine to me

read links below and you will be able to interpret the logs.

Ok thanks! Yeah Im still in the learning process with all this.

Good to hear at WOT and higher rpm's look good, but Ive noticed today that after a fill up at my local propel station my LT fuel trim is wayy high at idle. At idle AFR is 14.69 and LT fuel trim is 18.75. On my last fill up trims got as high as ~15.

Could this just be a different E85 mixture from the station? If so would higher fuel trims indicate less ethanol content?

I understand that I might have to do a MAF scaling. Im just a little intimidated with editing my own tunes.

Most important thing to me is knowing if Im safe to drive with these readings, if not some direction on what I need to do would be greatly appreciated.

[steve99]

Originally Posted by k.houan

Ok thanks! Yeah Im still in the learning process with all this.

Good to hear at WOT and higher rpm's look good, but Ive noticed today that after a fill up at my local propel station my LT fuel trim is wayy high at idle. At idle AFR is 14.69 and LT fuel trim is 18.75. On my last fill up trims got as high as ~15.

Could this just be a different E85 mixture from the station? If so would higher fuel trims indicate less ethanol content?

I understand that I might have to do a MAF scaling. Im just a little intimidated with editing my own tunes.

Most important thing to me is knowing if Im safe to drive with these readings, if not some direction on what I need to do would be greatly appreciated.

if you want to scale maf you will need to return to petrol

differing ethanol content can cause high trims

if you have cai or aftermarket intake you will likely ned to scale maf.


your trims do seem high lower rpm if all you have is filter it a bit strange for them to be that high.

check for intake/exhaust leaks and maybe clean maf sensor if it is an oiled filter maybe some oil on maf.

were your trims ok on petrol ? and before filter install

[k.houan]

Originally Posted by steve99

if you want to scale maf you will need to return to petrol

differing ethanol content can cause high trims

if you have cai or aftermarket intake you will likely ned to scale maf.


your trims do seem high lower rpm if all you have is filter it a bit strange for them to be that high.

check for intake/exhaust leaks and maybe clean maf sensor if it is an oiled filter maybe some oil on maf.

were your trims ok on petrol ? and before filter install

No aftermarket intake, just a dry hks drop in filter so I dont think there is a chance of dirty maf but ill check anyway. Trims were ok on regular gas maybe a little over 10 but still much better than they are with e85.

Will a muffler delete affect anything at all? I just installed a nameless 5" muffled track pipe, so maybe the less restricted exhaust flow can alter trims? Or am I wrong?

[steve99]

Originally Posted by k.houan

No aftermarket intake, just a dry hks drop in filter so I dont think there is a chance of dirty maf but ill check anyway. Trims were ok on regular gas maybe a little over 10 but still much better than they are with e85.

Will a muffler delete affect anything at all? I just installed a nameless 5" muffled track pipe, so maybe the less restricted exhaust flow can alter trims? Or am I wrong?

trims around 10 on petrol is pretty high no wonder its high in E85.

looks like you need a maf scale when your back on petrol then transfer it to the E85 tune and see how it goes.

you probably only need to do the Closed loop portion ie below 3v.

[k.houan]

Originally Posted by steve99

trims around 10 on petrol is pretty high no wonder its high in E85.

looks like you need a maf scale when your back on petrol then transfer it to the E85 tune and see how it goes.

you probably only need to do the Closed loop portion ie below 3v.

Alright I'll try my best to do that. Am I OK to drive around enough to finish off my full tank of e85? Maybe just take it easy on the throttle?

[steve99]

Originally Posted by k.houan

Alright I'll try my best to do that. Am I OK to drive around enough to finish off my full tank of e85? Maybe just take it easy on the throttle?

should be fine as the high trims are only at low rpm, might be a bit hesitant or rough off idle.

[k.houan]

Originally Posted by steve99

should be fine as the high trims are only at low rpm, might be a bit hesitant or rough off idle.

See, that's the weird part. Drives just fine, very smooth and normal idle.

What's the long term effect of driving with such high trims?

[steve99]

Originally Posted by k.houan

See, that's the weird part. Drives just fine, very smooth and normal idle.

What's the long term effect of driving with such high trims?

at low rpm ist usually just roughness or hesitation, their is only a finite amount of trim 30% but anything above 8-10% really needs sorting out as the ecu applies these trims in bands. so in your lowest band your say =12% so when you transition to next band which might be +2% your AFR is going to change 10%. Those trims are also applied when you go to open loop mode during hard acceleration WOT and can throw your AFR off from whats in the OL Fuel tables. Since its only the lowest band where your off its probably not that noticeable. Once you fix it you will probably notice better/smoother throttle response.

[k.houan]

Originally Posted by steve99

at low rpm ist usually just roughness or hesitation, their is only a finite amount of trim 30% but anything above 8-10% really needs sorting out as the ecu applies these trims in bands. so in your lowest band your say =12% so when you transition to next band which might be +2% your AFR is going to change 10%. Those trims are also applied when you go to open loop mode during hard acceleration WOT and can throw your AFR off from whats in the OL Fuel tables. Since its only the lowest band where your off its probably not that noticeable. Once you fix it you will probably notice better/smoother throttle response.

Thanks for the info! So is my muffler delete affecting anything?

[tomaszjanczak]

Originally Posted by k.houan

Thanks for the info! So is my muffler delete affecting anything?

Muffler delete will not affect anything because it is after the 2 oxygen sensors.

Any problems with air-fuel ratio or fuel trims are caused by something at or before the O2 sensors which can include vacuum leaks/exhaust leaks(before sensors)/faulty sensors.

[unlimited86]

After filling up gas with the stage 1 tune for awhile(91 oct), I've notice the gas meter barely stays on the top line of the gas meter and dips under it with just a few miles of driving. Before the tune, I remember the needle always goes over the top
Full line filling in full tank of gas. Is the sensor off or something? Because I filled it earlier with the empty gas light on and the pump stop at 10.5ish gallons and I was able to squeeze a few more to close to 11 gallon.

[Andrew025]

Originally Posted by unlimited86

After filling up gas with the stage 1 tune for awhile(91 oct), I've notice the gas meter barely stays on the top line of the gas meter and dips under it with just a few miles of driving. Before the tune, I remember the needle always goes over the top
Full line filling in full tank of gas. Is the sensor off or something? Because I filled it earlier with the empty gas light on and the pump stop at 10.5ish gallons and I was able to squeeze a few more to close to 11 gallon.

Are you asking in here because you think it's tune/OFT related?
Because it isn't related at all.

[jk86freek]

Hi Shiv ,

My friend just bought a GT86, we found his ecu is with ZA1JD00C where can i find the defination file or v2.04 i am not sure where to look for to download.

Best regard,
Jk