Official OpenFlash Tablet FA20 Tuning Tech Discussion Thread

[k.houan]

Originally Posted by Malt

The first thing I'd do is take some logs and post them up to datazap. People much smarter than me could look at your logs and determine if there really is an issue.

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I took a log from a long drive I recently did, tried to upload it and the file size is above the 2mb limit. Does the log of the size increase with the duration of it?

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[k.houan]

Just a short drive, but could you guys take a look at this?

http://www.datazap.me/u/khouan/drive-shila?log=0&data=1

[chris912]

subd

[steve99]

Originally Posted by k.houan

Interesting. I really don't think I could possibly have an exhaust leak. Could it be the filter? I made sure it was installed correctly and sealed properly. I really don't know what to do. Can i damage the engine running this way?

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It unlikely to be the filter. as its upstream from maf.

It might be you dislodged a hose sound tube ect or have a small vacuum leak in the intake tube where maf sits cause when you were manipulating air box to get filter in.

In your log the high fuel trims are only around idle and below 1000 rpm elsewhere when your on the throttle trims look ok but AFR looks slight lean for OFT tune at top end your mid 12 afr usually shiv tunes run a bit richer than that.

check all the hoses and clamps, sound tune and resonator connection in intake area

it could also be an exhaust gasket leak as @Malt said you wont always hear it but sometimes you can smell it

What were your ltft like on petrol ??

[Malt]

Originally Posted by steve99

It unlikely to be the filter. as its upstream from maf.

It might be you dislodged a hose sound tube ect or have a small vacuum leak in the intake tube where maf sits cause when you were manipulating air box to get filter in.

In your log the high fuel trims are only around idle and below 1000 rpm elsewhere when your on the throttle trims look ok but AFR looks slight lean for OFT tune at top end your mid 12 afr usually shiv tunes run a bit richer than that.

check all the hoses and clamps, sound tune and resonator connection in intake area

it could also be an exhaust gasket leak as @Malt said you wont always hear it but sometimes you can smell it

What were your ltft like on petrol ??

Steve, I think there might be something else going on here. From looking at my latest logs I've noticed some wide variations in trims. I started to try and rescale my MAF to get my trims +-1 but using the java app I didn't have enough data to get a nice smooth scale. I've noticed while steady state cruising looking at torque that commanded AFR seems to fluctuate quite a bit which might be causing the wide variations in trims people are seeing. Here's and example

http://www.datazap.me/u/malt/scaling...zoom=4344-4444

Commanded AFR going from 14.94 to 14.47 over and over, which doesn't seem normal. This is happening around 3200rpm.

Here's another example of the jumping commanded rate.
http://www.datazap.me/u/malt/scaling...zoom=4714-5111

What in the world is going on here? The closed loop pulls I've done look perfect but open loop still have LTFT's running from -3.9 all the way up to 5.4. Its fairly obvious to me that the higher positive trims are coming from very light partial throttles at somewhat lower rpms and as the rpms rise in open loop the trims get markedly lower. Just seems pretty odd that there would be such a massive difference in trims. Its been pretty hot here along with higher humidity than I care for which is necessitating running the AC. I can watch the trims change quite significantly when turning the AC on and off (which is expected obviously due to engine load). I'm starting to wonder if the newest CalID B01c might "fix" this as I think the bumping trims is caused by AC compressor cycling.

Any Ideas @shiv@vishnu

[k.houan]

Here is another log of a drive today. Look any better? No way I have an exhaust leak, the damn car is only about to hit 7k miles!

http://www.datazap.me/u/khouan/drive...e?log=0&data=1

[k.houan]

Originally Posted by steve99

It unlikely to be the filter. as its upstream from maf.

It might be you dislodged a hose sound tube ect or have a small vacuum leak in the intake tube where maf sits cause when you were manipulating air box to get filter in.

In your log the high fuel trims are only around idle and below 1000 rpm elsewhere when your on the throttle trims look ok but AFR looks slight lean for OFT tune at top end your mid 12 afr usually shiv tunes run a bit richer than that.

check all the hoses and clamps, sound tune and resonator connection in intake area

it could also be an exhaust gasket leak as @Malt said you wont always hear it but sometimes you can smell it

What were your ltft like on petrol ??

To be honest I have no idea what my ltft looked on regular 91. As soon as I got my OFT I ran empty, filled up with E85 and flashed stg 2 el tune. Drove easy until trims leveled out, ltft below 10 and figured I was good. Once I ran that first E85 tank empty, I installed the HKS filter and filled up again. Then things started looking funny. Maybe nothing is wrong, I wouldnt know. Thats why I'm asking for your guys help. Input from Shiv himself would be nice.

[s2d4]

Originally Posted by Malt

Steve, I think there might be something else going on here. From looking at my latest logs I've noticed some wide variations in trims. I started to try and rescale my MAF to get my trims +-1 but using the java app I didn't have enough data to get a nice smooth scale.

Get it done with a much more sufficient log for both close loop and open loop, then rinse and repeat a couple more times.

Originally Posted by Malt

I've noticed while steady state cruising looking at torque that commanded AFR seems to fluctuate quite a bit which might be causing the wide variations in trims people are seeing.

Torque is too slow, use the real time graphing display to see AFR vs command AFR, you'll see the behaviour much much more clearly.

Originally Posted by Malt

Here's and example

http://www.datazap.me/u/malt/scaling...zoom=4344-4444

Commanded AFR going from 14.94 to 14.47 over and over, which doesn't seem normal. This is happening around 3200rpm.

Here's another example of the jumping commanded rate.
http://www.datazap.me/u/malt/scaling...zoom=4714-5111

Normal, look at the fueling map for that rpm vs low load, doesn't deviate much.
The real time graph of afr vs commanded afr would help with this too.

[steve99]

Originally Posted by k.houan

To be honest I have no idea what my ltft looked on regular 91. As soon as I got my OFT I ran empty, filled up with E85 and flashed stg 2 el tune. Drove easy until trims leveled out, ltft below 10 and figured I was good. Once I ran that first E85 tank empty, I installed the HKS filter and filled up again. Then things started looking funny. Maybe nothing is wrong, I wouldnt know. Thats why I'm asking for your guys help. Input from Shiv himself would be nice.

First tank of E85 will generally have about 8-10 litres of straight petrol as thats when light comes on..

Your second tank will have much higher E% than first and require a bit of learning, looks like its starting to sort itself ltft down to about 8% from about 15%.

It not unusual to see ltft around 7 or 8% with a stock car that has not had maf scaled some are better some are worse.

[k.houan]

Originally Posted by steve99

First tank of E85 will generally have about 8-10 litres of straight petrol as thats when light comes on..

Your second tank will have much higher E% than first and require a bit of learning, looks like its starting to sort itself ltft down to about 8% from about 15%.

It not unusual to see ltft around 7 or 8% with a stock car that has not had maf scaled some are better some are worse.

Yeah, but I ran the tank way down after the light came on. Either way probably is what's happening. So 7 or 8 average should be safe? And what is a good afr for idle and wot? I'll post another log after more learning time.

Originally Posted by steve99

First tank of E85 will generally have about 8-10 litres of straight petrol as thats when light comes on..

Your second tank will have much higher E% than first and require a bit of learning, looks like its starting to sort itself ltft down to about 8% from about 15%.

It not unusual to see ltft around 7 or 8% with a stock car that has not had maf scaled some are better some are worse.

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[ST-A]

does anybody know if the stock MAP sensor can also be rescaled so it can read about 1bar/15psi? stock it seems it can read up to 0.4bar

or do i need the denso/honda K20 map sensor?

[DuroSquad]

Just ordered my OFT! Can't wait

[steve99]

Originally Posted by ST-A

does anybody know if the stock MAP sensor can also be rescaled so it can read about 1bar/15psi? stock it seems it can read up to 0.4bar

or do i need the denso/honda K20 map sensor?

I think your going to have to buy a new sensor but PM @nelsmar or @jamesm they should know.

[nelsmar]

Originally Posted by steve99

I think your going to have to buy a new sensor but PM @nelsmar or @jamesm they should know.

This is correct you will need a new sensor.