Data Logs! Post them here.

[bandit0289]

here is my 2500 - 7500 rpm pull.........OFT UEL stage 2 93 octane

any advice is great as I have no idea what is supposed to be going on here

http://www.datazap.me/u/bandit0289/l...7-8-9-10-11-12

[Phantobe]

Originally Posted by JB86'd

flashed the stage 2 uel 91 oct tune with my OFH earlier today, this is after about 40 miles of learning. I'm seeing some higher fuel trims on low rpm light throttle (~ +10-12%), under heavier acceleration I think it's looking okay. Hopefully the higher fuel trims go away after more learning. If I had an exhaust leak near the 02 sensor wouldn't fuel trims be off during heavy load as well?

How's it look?

http://datazap.me/u/joshbustos86/206...=1-4-7-9-12-14

Oddly enough I've been seeing something similar as well! My fuel trims have been around ~10% under a light load & sometimes idle/startup. However I still have some E85 left in my tank so I think this is why they're kinda high for me, time will tell.

In your WOT pull everything looks to be normal. I think that if you had a leak you would be seeing higher AFRs (>14.7) which would indicate a lean condition thus you would be seeing high positive LTFT during heavy acceleration. The ECU would be dumping extra fuel in to compensate for the lack of air, trying to correct the AFR.

[Phantobe]

Originally Posted by bandit0289

here is my 2500 - 7500 rpm pull.........OFT UEL stage 2 93 octane

any advice is great as I have no idea what is supposed to be going on here

http://www.datazap.me/u/bandit0289/l...7-8-9-10-11-12

You're running a little bit rich on your WOT pull but I don't think its anything to worry about. Fuel trims look okay.

You should log FLKC, Knock Corr. as well this will determine if your ECU is pulling timing & correcting knock conditions.

[bandit0289]

here is the new 3rd gear pull with knock correction and flke included

http://www.datazap.me/u/bandit0289/l...=0-1-2-9-13-14

[JB86'd]

Originally Posted by bandit0289

here is the new 3rd gear pull with knock correction and flke included

http://www.datazap.me/u/bandit0289/l...=0-1-2-9-13-14

You're getting minor knock at somewhat high load, nothing too bad. If you want to completely eliminate it, you could try using the 91 octane tune, or finding different gas that might be better. What fuel are you using?

You also have similar high LT fuel trims at light throttle/low rpm like I do with the stage 2 uel tune, how many miles have you driven on the tune so far before doing that log?

[Phantobe]

@JB86'd

What brand of 91 are you running? If you're running a 91 tune, something I've learned is that the higher your Ethanol percentage of the petrol the higher the fuel trims you'll see, particularly at idle/low loads. I found this out because when I was switching from E85 to 91 I seen insane LTFTs ~20% in some cases, once the ethanol percentage went down so did my fuel trims.

I didn't research too much but most stations are E10-E15 I believe.

[JB86'd]

Originally Posted by Phantobe

@JB86'd

What brand of 91 are you running? If you're running a 91 tune, something I've learned is that the higher your Ethanol percentage of the petrol the higher the fuel trims you'll see, particularly at idle/low loads. I found this out because when I was switching from E85 to 91 I seen insane LTFTs ~20% in some cases, once the ethanol percentage went down so did my fuel trims.

I didn't research too much but most stations are E10-E15 I believe.

I've been using Shell for months now, same station. I filled up with gas today, so it's possible that this gas has a high Ethanol %. Does winter blend fuel have a higher % of ethanol?

I found that Shell is more knock resistant than the Chevron station near me, which could be due to higher E%...you may be on to something there.

[Phantobe]

Originally Posted by JB86'd

I've been using Shell for months now, same station. I filled up with gas today, so it's possible that this gas has a high Ethanol %. Does winter blend fuel have a higher % of ethanol?

I found that Shell is more knock resistant than the Chevron station near me, which could be due to higher E%...you may be on to something there.

AFAIK I don't think ethanol content would change between summer and winter...

http://www.popularmechanics.com/cars...ence-13747431/

I'm currently running Chevron, I'll have to take a look at some pumps. I thought something got passed in CA where all gas is E15 not quiet sure though.

[sav]

Originally Posted by steve99

That log looks pretty good especially if your on 95 octane south africa fuel.

I am not 100% sure of some of those Ecutek log parameters.

Your IAM is one which is good, the ecu will not immediately decrement the IAM value on every instance of knock. There needs to be a certain severity and frequency of knock events to cause the iam to drop. ie you can have some minor knock events occasionally and still have iam=1.

it looks like you are free of FBKC(knock correction) but you have a bit of FLKC (fine learning knock correction) of about -1 degree between 2200 and 2900 rpm if I am reading those paramerters correctly. judging by the kc learned values and the fine correction. Not sure what the coarse correction parameter is it looks like its the "Knock correction Advance max A " value from tables and not the amount of knock correction.

looks like all thats needed is maybe 0.7 degrees removed from Base Timing B table from 2000-3000 rpm engine loads 0.9 to 1.1 these motors tend to be knocky in that range especially on 95ron fuel.

Claims were made that the South African fuel knocks so bad that in gerneral most 86'es here would be running IAM of 0.2 or 0.3

I've finally managed to check mine out and guess what? 0.7
Not perfect but not nearly as bad as it was made out to be or am I misunderstanding?

[GeeTee86]

Originally Posted by sav

Claims were made that the South African fuel knocks so bad that in gerneral most 86'es here would be running IAM of 0.2 or 0.3

I've finally managed to check mine out and guess what? 0.7
Not perfect but not nearly as bad as it was made out to be or am I misunderstanding?

let me help you with that

Originally Posted by Dammod

Hi Sav,
Every 86 or BRZ we have plugged into goes down to a IAM of 0.35, all with different fuels. Thats a lot of det and timing being pulled

What are you using to monitor and which parameter are you monitoring?

[sav]

Thanks, so am I right in understanding that things are not nearly as bad as they were made out to be?

[Dammod]

Originally Posted by sav

Claims were made that the South African fuel knocks so bad that in gerneral most 86'es here would be running IAM of 0.2 or 0.3

I've finally managed to check mine out and guess what? 0.7
Not perfect but not nearly as bad as it was made out to be or am I misunderstanding?

Not "claims", just posting our findings.
FYI, see attached. Stock logs, all different cars.

Altitude would lessen the effects of the stock maps aggressiveness for our fuel, having said said, 0.7 is still in the upper regions of what we have seen at altitude.
Driving style and conditions during the log will also play a big factor.

Your findings go hand in hand with my theory about the higher than "normal" amount of engine problems being experienced at the coastal regions of SA compared to the highveld.

[sav]

Cool, so our engines are not about to blow up at altitude, that's at least good to know.

BTW.
My driving usually consists of lots of traffic then hard driving when it opens up.

[steve99]

Originally Posted by sav

Claims were made that the South African fuel knocks so bad that in gerneral most 86'es here would be running IAM of 0.2 or 0.3

I've finally managed to check mine out and guess what? 0.7
Not perfect but not nearly as bad as it was made out to be or am I misunderstanding?

I believe @GeeTee86 was running E50 in that log ??

but other logs I looked at from someone in SA cannot remember who did have Iam about 0.5 on petrol.

It unlikely to blow up as ecu is managing knock and still has more ability to correct knock but will nobble power somewhat , I have seen stock cars in Austrlaia with similar IAM on 98 ron and they are still running.

Even if the IAM was 0.1 it could still pull another 5 degrees FLKC i believe.