Data Logs! Post them here.

[DocWalt]

Originally Posted by Wepeel

Thanks. Is the 0.0 on lift normal?

Yes, decel fuel cutoff. 100% normal

[BigFatFlip]

I'm hoping somebody here can take a look at my logs and tell me if I'm crazy or not.

I have a '13 BRZ with an Edelbrock SC installed (along with their CARB tune). In the mornings, or when the car sits for an extended amount of time (long enough to get a "cold start" high idle), I would get really bad "lurching"/"lunging" when cruising at parking lot speeds (10-15 mph). The car would jerk me back and forth, and the only thing I can do to make it stop is to completely take my foot off the gas to allow the car to settle, then try to ease into it again. I'm thinking its something to do with the throttle mapping where the jerk forward would cause me to slightly step on the gas, then quickly let off, propagating the cycle. Another friend suggested it could also be my clutch.

What I'm trying to find out is if it is tune (MAF, throttle mapping, etc.) related at all. Here are a couple of logs.

http://datazap.me/u/bigfatflip/16022...1?log=0&data=6
http://datazap.me/u/bigfatflip/16022...2?log=0&data=6

Any feedback would be much appreciated!

[kch]

http://datazap.me/u/kch/e77-rev-2?log=0&data=6

Any thoughts? This is my first revision.

[Wayno]

Originally Posted by BigFatFlip

I'm hoping somebody here can take a look at my logs and tell me if I'm crazy or not.

I have a '13 BRZ with an Edelbrock SC installed (along with their CARB tune). In the mornings, or when the car sits for an extended amount of time (long enough to get a "cold start" high idle), I would get really bad "lurching"/"lunging" when cruising at parking lot speeds (10-15 mph). The car would jerk me back and forth, and the only thing I can do to make it stop is to completely take my foot off the gas to allow the car to settle, then try to ease into it again. I'm thinking its something to do with the throttle mapping where the jerk forward would cause me to slightly step on the gas, then quickly let off, propagating the cycle. Another friend suggested it could also be my clutch.

What I'm trying to find out is if it is tune (MAF, throttle mapping, etc.) related at all. Here are a couple of logs.

http://datazap.me/u/bigfatflip/16022...1?log=0&data=6
http://datazap.me/u/bigfatflip/16022...2?log=0&data=6

Any feedback would be much appreciated!

Your foot is moving on the throttle pedal. The only thing you could do is flatten out the throttle map between 5% and 10% which will make it feel not very good, or use cruise control.

http://datazap.me/u/bigfatflip/16022...43-48-50-53-56

[BigFatFlip]

Originally Posted by Wayno

Your foot is moving on the throttle pedal. The only thing you could do is flatten out the throttle map between 5% and 10% which will make it feel not very good, or use cruise control.

http://datazap.me/u/bigfatflip/16022...43-48-50-53-56

That's what I suspected, thank you.

[solidONE]

Originally Posted by Wepeel

Alright, been a while, but with all the weather the car has been parked for a while. I was monitoring O2 sensor voltage today and noticed that it seems to fluctuate between 0.5-0.8 volts during driving, but on throttle lift will hit 0.0. Is that normal?

I've not measured the voltages, so I wouldn't know for sure.

Originally Posted by DocWalt

Yes, decel fuel cutoff. 100% normal

Have you actually measure the output of the voltages?

[DocWalt]

Originally Posted by solidONE

I've not measured the voltages, so I wouldn't know for sure.



Have you actually measure the output of the voltages?

I've not personally monitored it on the 86, but...

[solidONE]

Originally Posted by DocWalt

I've not personally monitored it on the 86, but...

Looks to go as low as 0.03v or so on this chart, but who knows for sure how low the output voltages go on our particular application.

[solidONE]

First tank of summer blend gas. looking nice:
http://datazap.me/u/solidone/z6-win-...zoom=2266-2663

Same tune before the switch to summer blend:
http://datazap.me/u/solidone/z6-di-r...&zoom=884-1387

[cawith]

It finally looks like OL fueling is also acceptable, but I still have some knock (both FBKC and FLKC). It's mostly there between 2500-4000rpm in all gears, but the most annoying occurrence is running at 130 km/h in 6th gear, where very light throttle (only in closed loop) input gives knock constantly.

I noticed that command AFR is really varying a lot between 14.24 and 15.06 even with steady throttle, engine load and rpm. Why is it doing that??? What tables is it looking at other than Primary OL Fueling and CL Fueling Target Compensation?
See here!

You can see there whole 44 sec. log here.

How do I address this knock?

[Wayno]

Originally Posted by cawith

It finally looks like OL fueling is also acceptable, but I still have some knock (both FBKC and FLKC). It's mostly there between 2500-4000rpm in all gears, but the most annoying occurrence is running at 130 km/h in 6th gear, where very light throttle (only in closed loop) input gives knock constantly.

I noticed that command AFR is really varying a lot between 14.24 and 15.06 even with steady throttle, engine load and rpm. Why is it doing that??? What tables is it looking at other than Primary OL Fueling and CL Fueling Target Compensation?
See here!

You can see there whole 44 sec. log here.

How do I address this knock?

AFR = emmisions
Knock = minor

Literally nothing to worry about in that log.

[cawith]

Originally Posted by Wayno

AFR = emmisions
Knock = minor

Literally nothing to worry about in that log.

Regarding the knock, wouldn't it be better for the engines "health" to do something about it even though it's only minor, than to just ignore it?
And when does it stop being minor knock in your mind? More than -1 FBKC or FLKC?

I know that Toyota tries to keep the emissions as low as possible but wouldn't it then be better to keep the AFR in a smaller range from around 14.7-15.0?
What I don't understand is, why does command AFR fluctuate so much under steady throttle? I mean it must get it's target from somewhere in the rom...?

[Rezi]

Originally Posted by cawith

Regarding the knock, wouldn't it be better for the engines "health" to do something about it even though it's only minor, than to just ignore it?
And when does it stop being minor knock in your mind? More than -1 FBKC or FLKC?

I know that Toyota tries to keep the emissions as low as possible but wouldn't it then be better to keep the AFR in a smaller range from around 14.7-15.0?
What I don't understand is, why does command AFR fluctuate so much under steady throttle? I mean it must get it's target from somewhere in the rom...?

@cawith
I have exact the same Knock (or false knock) around that Area (between 3400-3600rpm@0.5/0.6 load). Stg1 Wayno's 98 v96 (no MAF-Scaling).

With Shell V-Power (100 octane EU) and BP Ultimate (98 octane EU) i have a lot of minor -0.65 FLKC and little FBKC of -0.69. IAM at 1 all the time.

With OMV MaxxMotion (100 octane) i have zero FLKC. Only little FBKC of -0.69. IAM at 1 all the time.

Maybe the sensor goes on because my bumper is hitting the chassis at higher speed (broken clip).

With stock OTS Stage 1 91oct i had a lot of FLKC/FBKC and IAM drops.

I did not log higher rpm's, but monitored it. Zero FLKC/FBKC with OMV MaxxMotion.

I would leave it as it is now (also thought of pulling about 0.7 degree of timing, but i let the ECU handle it). Or investigate it at higher outdoor temperatures. Steve also "calmed me down" that i do not have to worry about FLKC/FBKC if it is less than -1.

Shell V-Power: http://datazap.me/u/rezi/stg1-a00g-w...og=0&data=1-10
OMV MaxxMotion: http://datazap.me/u/rezi/stg-1-a00g-...og=0&data=1-10

[Dru670]

can anyone tell me if there is anything wrong here most especially the highlighted rows which is when I hit 2nd gear it feels like it bogs or hesitates for a second and then smoothens out as rpm or speed picks up. I'm a total noob sorry.

BTW i'm running a drop-in filter, UEL header, and catback exhaust on stage 2 91 tune.