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

[Cockatoo]

Yep, I have some Redline sitting right here when the time comes

[Cockatoo]

Here we go...

[s2d4]

Originally Posted by Cockatoo

Here we go...

You won't be able to go back...
I tried, couldn't do it..

[Superhatch]

Originally Posted by s2d4

You won't be able to go back...
I tried, couldn't do it..

heh. I was worried about that. I'm about 5k into my e85 tune and it feels stronger than ever. Perrin intake for now is my only engine mod. oft header, Perrin resonated exhaust, shorter rear end, light driveshaft and flywheel and this will feel perfect I think.

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[s2d4]

Originally Posted by Superhatch

heh. I was worried about that. I'm about 5k into my e85 tune and it feels stronger than ever. Perrin intake for now is my only engine mod. oft header, Perrin resonated exhaust, shorter rear end, light driveshaft and flywheel and this will feel perfect I think.

I wouldn't bother with the CBE, driveshaft or flywheel yet unless it is just for sound or lightness feel.
Stock exhaust with cat warm up removed using romraider/OFT is free, not loud and clearly has rumble.
The money you saved from drive shaft/flywheel/cbe, you could definitely get the esc on e85 with money to spare.

[Kronos]

Originally Posted by Superhatch

heh. I was worried about that. I'm about 5k into my e85 tune and it feels stronger than ever. Perrin intake for now is my only engine mod. oft header, Perrin resonated exhaust, shorter rear end, light driveshaft and flywheel and this will feel perfect I think.

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You and I sir, have the exact same plan

It just sounds like the perfect recipe


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[poptopclk]

I have 2200 miles and just did flash 2 tanks ago. I'd say a couple thousand miles won't make any big difference on oil changes.


However, oil is cheap so I will change sooner rather than later. Will use an ethanol rated oil from here on out.


ONLY, down side is fuel consumption. I get about 100 less miles per tank then again a fill-up is 10 bucks cheaper.


I'd rather have the performance. The engine loves this fuel/tune combo

[Necric]

Originally Posted by mmmcambelsoup

This is probably beating a dead horse, but what are normal (LFT's & AFR) at idle, cruise & WOT?

I'd like to know this as well.

Also would investing in some better injectors help at all?

[steve99]

Originally Posted by Necric

I'd like to know this as well.

Also would investing in some better injectors help at all?

LTFT less than 10%

LTFT is fueling error does not indicate if injectors maxed out.

you would need to look at injector pulse width and duty cycles and max flow rates ect to work that out

AFR under load should be near whats in Open loop fuel table

At WOT AFR around mid 12 midrange, high rpm low 12 high 11 on E85

Stock injectors ok for NA E85 , probably going need replacing if going FI on E85 with larger capacity.

[Cockatoo]

This is so crazy... Over the past two days I've literally heard the E85 killing the crickets!!

I went from a steady swarm of crickets, to a handful of crickets, and now after today I think they might be gone.....

[steve99]

Originally Posted by Cockatoo

This is so crazy... Over the past two days I've literally heard the E85 killing the crickets!!

I went from a steady swarm of crickets, to a handful of crickets, and now after today I think they might be gone.....

Additives in some E85 suppress crickets, usually alchol will fire them up like with 10% alchol fuels, but it appears with most E85 the additives possible some form of lubticant kills them off.

Dont worry they will return one you go back to a 10% petrol blend

[mmmcambelsoup]

@steve99 w/ catless header recently installed, and e85 map stage 2.

idle = (afr 14.69, ltft 14.06%, adv mult 1.00)
cruise = (afr 14.69, ltft below 10%, adv mult 1.00)
wot = (low/mid 12's, ltft below 10%, adv mult 1.00)

... why is my ltft so high during idle? Do I have a leak w/ my new header?

[steve99]

Originally Posted by mmmcambelsoup

@steve99 w/ catless header recently installed, and e85 map stage 2.

idle = (afr 14.69, ltft 14.06%, adv mult 1.00)
cruise = (afr 14.69, ltft below 10%, adv mult 1.00)
wot = (low/mid 12's, ltft below 10%, adv mult 1.00)

... why is my ltft so high during idle? Do I have a leak w/ my new header?

Are the fuel trims always positive or always negitive
is this you first tank of e85

if they are always negitive it the tune compensating for low e% ie high petrol.
the trims will be close to zero near e70 ot their abouts

as the e% varies with e85 the fuel trims will wander to compensate. as no flex fuel sensor ,
looks ok

you rearly need to go back to petrol and then look at you fuel trims and if they were still 10% or so do maf scaling when on petrol ( second tank )

the afr at cruise idle will be in 14 as you see but under load it should be in 12 to 13, and high rpm high load low 12 maybe high 11.

the o2 sensor doesnt know your on e85 so its reading ok as its just calibrated to read petrol stoich 14.7


what were you fuel trims like on petrol ? not unusual to see 5 to 8% on petrol on a non scaled maf

[mmmcambelsoup]

@steve99 brought my car to an exhaust shop to check for any leaks. They found a slight leak where overpipe/header and header itself. Tightened that up and ltft during idle did drop a little from 14.06%. I'll keep monitoring to see if it drops below 10%.