Knock fix with Australian Fuel 98/100 RON

[s2d4]

Originally Posted by AL008

Are there any problems using a 02 Spacer in the secondary of the header?

If you are confident that there is no leaks, just disable the DTC.

[Gums]

Thanks for your efforts to help overcome our crappy fuel steve99.

Since reading this post I am running 100ron exclusively, though haven't loaded your tune as I have been running a prototype Phantom ESC with Shiv's G rom ESC tune.

With s2d4's assistance I have a 3rd - 4th gear pull from earlier this week.

Would value your thoughts on how this looks and which parameters I should be logging to see if I am getting any knock.

Exhaust/filter are stock.

http://www.datazap.me/u/gums/aussie-esc-pull-100ron

[steve99]

Originally Posted by Gums

Thanks for your efforts to help overcome our crappy fuel steve99.

Since reading this post I am running 100ron exclusively, though haven't loaded your tune as I have been running a prototype Phantom ESC with Shiv's G rom ESC tune.

With s2d4's assistance I have a 3rd - 4th gear pull from earlier this week.

Would value your thoughts on how this looks and which parameters I should be logging to see if I am getting any knock.

Exhaust/filter are stock.

The FLKC is still not working correctly on G roms as far as i know,

for knock log

RPM
THROTTLE
FBKC
KNOCK CORRECTION
KC LEARNED ( we can derive flck from this)
IAM
try FLKC but is probably suspect
Engine LOAD

PROBABLY WORTH
LTFT
FUEL SYSTEM STATUS OL/CL
AFR
COMMANDED AFR

got no experience with the phantom esc but we will be able to see if its knocking

[Gums]

Thanks Steve,
Bit of a noob when it comes to this, added link in previous post to datazap

[steve99]

Originally Posted by Gums

Thanks Steve,
Bit of a noob when it comes to this, added link in previous post to datazap

Hi you need to log

RPM
THROTTLE
FBKC
KNOCK CORRECTION
KC LEARNED ( you can derive flck from this but you will need to look at the Ignition Advance Max A table)
IAM
try FLKC but is probably suspect
Engine LOAD

It looks a bit suspect where the KC Learned is stepping down at higher rpm on towards the end the third rpm peak. But you really need to log LOAD and knock correction and FLCK to make sense of it. It might just be the tune reducing advance as load rises under boost

http://www.datazap.me/u/gums/aussie-...1-2-5-6&solo=5

I think your better off sending the logs to Shiv and let him look at it

[Fizz]

I did a power run on a dynapack yesterday, as I've never dyno'ed this car before. Here are the results:
http://s9.postimg.org/kevmjohnz/2014...527_Page_1.jpg

This chart overlays a run taken from stock BRZ which was done on the same dyno:
http://s9.postimg.org/g70uaxg8f/2014...527_Page_2.jpg

My tune was done by @jamesm from HRI Tuning. Only other mod is a Motiv catted front pipe. I felt that I really needed a custom tune instead of a canned tune because the of the crappy fuel here...even on 98RON...and the ECU's hyper-sensitivity to fuel quality.

Anyways, what I noticed was that the AFR readings from the dyno run doesn't quite match the readings taken from my OFT logs. Can someone chime as to why? Here's my most recent data log taken couple of days ago: http://datazap.me/u/fizz/hrilog11?lo...1&zoom=33-2077

The AFR's from the dyno appears to be quite lean at WOT...?

[steve99]

Originally Posted by Fizz

I did a power run on a dynapack yesterday, as I've never dyno'ed this car before. Here are the results:
http://s9.postimg.org/kevmjohnz/2014...527_Page_1.jpg

This chart overlays a run taken from stock BRZ which was done on the same dyno:
http://s9.postimg.org/g70uaxg8f/2014...527_Page_2.jpg

My tune was done by @jamesm from HRI Tuning. Only other mod is a Motiv catted front pipe. I felt that I really needed a custom tune instead of a canned tune because the of the crappy fuel here...even on 98RON...and the ECU's hyper-sensitivity to fuel quality.

Anyways, what I noticed was that the AFR readings from the dyno run doesn't quite match the readings taken from my OFT logs. Can someone chime as to why? Here's my most recent data log taken couple of days ago: http://datazap.me/u/fizz/hrilog11?lo...1&zoom=33-2077

The AFR's from the dyno appears to be quite lean at WOT...?

Likely Dyno guys would have hooked up their own wideband 02 sensor which would be more accurate than the stock o2 sensor the OFT is using I suspect.

[s2d4]

Originally Posted by steve99

Likely Dyno guys would have hooked up their own wideband 02 sensor which would be more accurate than the stock o2 sensor the OFT is using I suspect.

The placement location would be another variation as well unless it is at the rear oem o2 sensor, even then they won't be exactly the same.

[Fizz]

Ok thanks guys....makes sense now. But still curious which is the more accurate/true reading? The sensor from dyno, or sensor from car?

If the reading from the dyno is a better reflection of actual conditions, that means I'm potentially running too lean at WOT? Or am I worrying too much?

[steve99]

Originally Posted by Fizz

Ok thanks guys....makes sense now. But still curious which is the more accurate/true reading? The sensor from dyno, or sensor from car?

If the reading from the dyno is a better reflection of actual conditions, that means I'm potentially running too lean at WOT? Or am I worrying too much?

hopefully the dyno's O2 would be more accurate as they would check its calibration.

[s2d4]

Originally Posted by Fizz

Ok thanks guys....makes sense now. But still curious which is the more accurate/true reading? The sensor from dyno, or sensor from car?

If the reading from the dyno is a better reflection of actual conditions, that means I'm potentially running too lean at WOT? Or am I worrying too much?

I would go with the stock at the moment.

Did you ever do one with just Shiv's tune?

[Fizz]

Originally Posted by s2d4

I would go with the stock at the moment.

Did you ever do one with just Shiv's tune?

No I didn't. But with Shiv's canned tune I was getting heaps of tip-in knock. Since getting the custom tune done it's all smooth....

[s2d4]

Originally Posted by Fizz

No I didn't. But with Shiv's canned tune I was getting heaps of tip-in knock. Since getting the custom tune done it's all smooth....

Yeah, you can tell by the commanded afr at the high load low rpm range, also appears to target the same from cl to ol.
Looks like power did drop in that area because of it though, a bit of a balancing act I guess.

[Kodename47]

The dyno O2 sensor will be exposed to more ambient air and is after 1/2 cats depending on your exhaust configuration so it will read leaner probably by a good 0.1-0.2 AFR points minimum. As for which one to trust, that's down to you. I've heard reports recently of someone I know having 3 sensors in the exhaust pre-cat (inc. 1 OEM) and one in the tail pipe. They all read differently, so again, do you trust 1/none/all??

Feed it back to James and see what he says. So long as its not knocking I don't see an issue so long as you're not lean at the top end, which you're not.