How to run E85 on stock 86 BRZ FRS with OFT tune

[nelsonzep]

Just updating precoous info in switching back to 93 while i was still on e85 tune with 93 in tank right after fill up ltft dropped to about 14% i know when ltft changed i am supposed to switch to the other tune but it dropped to almost normal levels while on e85 i am very co fused here? Can i get your input on this please

[phrosty]

Originally Posted by nelsonzep

Just updating precoous info in switching back to 93 while i was still on e85 tune with 93 in tank right after fill up ltft dropped to about 14% i know when ltft changed i am supposed to switch to the other tune but it dropped to almost normal levels while on e85 i am very co fused here? Can i get your input on this please

When switching back to 93, you wait for FTs to go negative. It can take a while for 93 to clear through your fuel lines. Don't trust idle FTs because those tend to fluctuate.

[Texas2016Frs]

Originally Posted by steve99

dont worry about stft it varies widly with throttle and load

ltft is the one to watch and the actual afr

if you have a low e% due residual petrol ltft will trend negitive but as long as afr at wot is mid to low 12 its ok

midrange mid throttle afr arround 13 or high 12

cruising and idle afr arround 14 to 14.7

on your next tank it will likely be less negitive ltft

here's my log could you take a look please? http://www.datazap.me/u/texas2016frs...7-8-9-10-11-12

[steve99]

Originally Posted by Texas2016Frs

here's my log could you take a look please? http://www.datazap.me/u/texas2016frs...7-8-9-10-11-12

it looks ok from what i can see, some of the parameters like iam are not logging correctly appears the oft logging for the 2015 some parameters not working correctly.

it very light throttle but it looks ok.

maybe do a short full throttle from 2000-5000 and see what that looks like_ You should see afr getting down to 13 and into 12 past 4000 or so.

[Texas2016Frs]

Originally Posted by steve99

it looks ok from what i can see, some of the parameters like iam are not logging correctly appears the oft logging for the 2015 some parameters not working correctly.

it very light throttle but it looks ok.

maybe do a short full throttle from 2000-5000 and see what that looks like_ You should see afr getting down to 13 and into 12 past 4000 or so.

afr does get down to 12 anything else i should look for? thank you for your help!

[steve99]

Originally Posted by Texas2016Frs

afr does get down to 12 anything else i should look for? thank you for your help!

knock, but unlikely on e85

have a read of the logging link below

[Texas2016Frs]

Originally Posted by steve99

knock, but unlikely on e85

have a read of the logging link below

here is a log of a few wot accelerations, if you have time please take a look (:
http://www.datazap.me/u/texas2016frs...7-8-9-10-12-14

[steve99]

Originally Posted by Texas2016Frs

here is a log of a few wot accelerations, if you have time please take a look (:
http://www.datazap.me/u/texas2016frs...7-8-9-10-12-14

mate it look like its settled down now the ltft are max -7% which is pretty normal with residual petrol and the afr wot high rpm is 11.3 bit on the rich side but safe. Being rich costs you some power but is safe

no knock indicated, dont worry about the iam being zero looks like oft logging issue

are you on latest openflash manager and template files from oft downloads site ??

[Texas2016Frs]

Originally Posted by steve99

mate it look like its settled down now the ltft are max -7% which is pretty normal with residual petrol and the afr wot high rpm is 11.3 bit on the rich side but safe. Being rich costs you some power but is safe

no knock indicated, dont worry about the iam being zero looks like oft logging issue

are you on latest openflash manager and template files from oft downloads site ??

Yes I am completely deleted/redownload everything yesterday to make sure. It's very humid and I read somewhere that it can cause the engine to run rich is that true?

Thanks for taking a look!

[steve99]

Originally Posted by Texas2016Frs

Yes I am completely deleted/redownload everything yesterday to make sure. It's very humid and I read somewhere that it can cause the engine to run rich is that true?

Thanks for taking a look!

ambient temps can change fuel trims a bit

with very high fuel trims previouisly its possible the wrong tune was flashed, if all thats changed since last log, ie you havenot refilled tank

[Texas2016Frs]

Originally Posted by steve99

ambient temps can change fuel trims a bit

with very high fuel trims previouisly its possible the wrong tune was flashed, if all thats changed since last log, ie you havenot refilled tank

I know that it's the same tune because I took great care (checked like 5 times) to make sure I put the right tune on and then also checked after it was flashed to the car any ideas?

[Texas2016Frs]

Originally Posted by Texas2016Frs

I know that it's the same tune because I took great care (checked like 5 times) to make sure I put the right tune on and then also checked after it was flashed to the car any ideas?

The ambient temps changed about 40+degrees in 2 days

[steve99]

Originally Posted by Texas2016Frs

The ambient temps changed about 40+degrees in 2 days

Wow 40 yep you could expect the lower end fuel trims to vary maybe 5% with uch a big change, it probably the residual petrol in tank as well and trims averaging out but looks ok now, the lower end fuel trims vary more as at idle and low speed temps vary widly under bonnet especially in hot weather.

[Texas2016Frs]

Originally Posted by steve99

Wow 40 yep you could expect the lower end fuel trims to vary maybe 5% with uch a big change, it probably the residual petrol in tank as well and trims averaging out but looks ok now, the lower end fuel trims vary more as at idle and low speed temps vary widly under bonnet especially in hot weather.

Do you think that once the ecu learns the trims again it will run less rich?