Automatic FR-S BRZ top end AFR

[demonracer200d]

Does anyone know if there is a solution, by tuning or such, to fix the rich afr mixture that occurs in the automatics once past 6k rpm?

[Wayno]

Afaik the sensor isn't accurate above 6k.

[steve99]

Originally Posted by demonracer200d

Does anyone know if there is a solution, by tuning or such, to fix the rich afr mixture that occurs in the automatics once past 6k rpm?

is it richer than the afr values in the OPEN LOOP FUEL TABLE ?

Whats your Long Term Fuel Trim ? at high rpm

if it off then you likey need to scale maf sensor especially if you have aftermarket intake.

of you may have intake air leak at maf sensor or downstream from maf sensor or exhaust leak near or before O2 sensors

[4wheelinls1]

I found the vehicles wideband didn't agree with my dyno, you can adjust the vehicles wideband scaling. I Set the commanded where I want it and then trim the o2 sensor until it agrees with the dyno sensor and the learned values are close to zero.

[demonracer200d]

Originally Posted by steve99

is it richer than the afr values in the OPEN LOOP FUEL TABLE ?

Whats your Long Term Fuel Trim ? at high rpm

if it off then you likey need to scale maf sensor especially if you have aftermarket intake.

of you may have intake air leak at maf sensor or downstream from maf sensor or exhaust leak near or before O2 sensors

I have yet to tune my car and not really familiar with a lot of this. Just been reading up and doing my research and found this on a lot of the dynos for the automatic so wondering if there is a solution.

[demonracer200d]

Originally Posted by 4wheelinls1

I found the vehicles wideband didn't agree with my dyno, you can adjust the vehicles wideband scaling. I Set the commanded where I want it and then trim the o2 sensor until it agrees with the dyno sensor and the learned values are close to zero.

I plan on getting openport with flash ecu, would I be able to assist those values in Romraider or would I have to get custom tune done by a shop.

[demonracer200d]

Originally Posted by 4wheelinls1

I found the vehicles wideband didn't agree with my dyno, you can adjust the vehicles wideband scaling. I Set the commanded where I want it and then trim the o2 sensor until it agrees with the dyno sensor and the learned values are close to zero.

Alright so if I understand correctly the mixture is not actually rich it is just displayed rich on the dyno, and if so why the power loss up top compared to mt?

[steve99]

Originally Posted by demonracer200d

Alright so if I understand correctly the mixture is not actually rich it is just displayed rich on the dyno, and if so why the power loss up top compared to mt?

These motor need to run rich to give them knock resistance.

its not as easy as leaning it out to produce power, generally you will just get knock, which the stock tune already does on anything but the best fuel.

the amonunt of timing advance you can run has the biggest effect on power and this is determined by a lot of factors such as fuel octane fuel air ratio injector firing angles port/direct injection.

unless you have considerable experiene in tuning i would suggest you use asystem that comes witth tunes or get a tuner to do it..

[demonracer200d]

Originally Posted by steve99

These motor need to run rich to give them knock resistance.

its not as easy as leaning it out to produce power, generally you will just get knock, which the stock tune already does on anything but the best fuel.

the amonunt of timing advance you can run has the biggest effect on power and this is determined by a lot of factors such as fuel octane fuel air ratio injector firing angles port/direct injection.

unless you have considerable experiene in tuning i would suggest you use asystem that comes witth tunes or get a tuner to do it..

Thanks Steve. By a system that comes with tunes you mean like oft? Also does this rich state also occur with the M/T engines?

[steve99]

Originally Posted by demonracer200d

Thanks Steve. By a system that comes with tunes you mean like oft? Also does this rich state also occur with the M/T engines?

from memory the Open loop fuel target for my stock manual/auto was low 11 to high 10 at max rpm load for afr , i think what your seeing on a stock tune is pretty normal.

tuned stock cars probably run a bit leaner high 11 low 12 at higher rpm/load

get the tuning solution that suits you needs/wants not necessaray the cheapest or dearest one.

OFT is middle of the road gives you device to flash comes with tunes and they are not locked so you can tweak yourself get another tuner too tweak it. you can flash back to stock anytime or flash updated tunes, it can also be unmarreied from you car and onsold as a complete package

Tactrix/ecuflash if you know what your doing and prepared to do lots of reading/learning. does not lock anything will read/write any brz/86 provided a locked tune not written to ca

you can self tune with ecutek/brzedit as well if you buy the required licences/cables ect

or go to tuner if you just want it tuned and be done with it, but many tuners will lock their tunes so they can only be adjusted or read/written by them some dont but ecutek licence is locked to your car and cannot be onsold only the cable can so it only writes to car you have licence for.

[demonracer200d]

Originally Posted by steve99

from memory the Open loop fuel target for my stock manual/auto was low 11 to high 10 at max rpm load for afr , i think what your seeing on a stock tune is pretty normal.

tuned stock cars probably run a bit leaner high 11 low 12 at higher rpm/load

get the tuning solution that suits you needs/wants not necessaray the cheapest or dearest one.

OFT is middle of the road gives you device to flash comes with tunes and they are not locked so you can tweak yourself get another tuner too tweak it. you can flash back to stock anytime or flash updated tunes, it can also be unmarreied from you car and onsold as a complete package

Tactrix/ecuflash if you know what your doing and prepared to do lots of reading/learning. does not lock anything will read/write any brz/86 provided a locked tune not written to ca

you can self tune with ecutek/brzedit as well if you buy the required licences/cables ect

or go to tuner if you just want it tuned and be done with it, but many tuners will lock their tunes so they can only be adjusted or read/written by them some dont but ecutek licence is locked to your car and cannot be onsold only the cable can so it only writes to car you have licence for.

Thanks for all the info man, really appreciate it

[Wayno]

See my thread on AT and E85 tuning. Adjusting the load limits solves a lot of the problems with the fueling on the AT, caused by the extra load the AT generates. This way you can eliminate the leaning out around 6400rpm and thus make your MAF scale leaner in that area, so a little bit flatter AFR.

http://datazap.me/u/wayne/v66-8-3rd?...1&zoom=186-348