Mixing E85 to boost octane

dedoom · 10-07-2017, 04:26 PM

I was recently dyno tuned by Seb from Specialty Z. With map 3 he told me I'll need higher octane. My question is, can I mix e85 with 91 to bring the octane rating to 93-95? My fuel system is stock. Just wondering if it can handle it.

BGTV8 · 10-07-2017, 04:51 PM

Short answer is NO.

E85 requires more injector flow capacity in general and you really need the E85 sensor in your fuel system so the ECU can determine the ethanol mixture and therrefore "how" much fuel to inject.

dedoom · 10-07-2017, 04:59 PM

Quote:

Originally Posted by BGTV8

Short answer is NO.

E85 requires more injector flow capacity in general and you really need the E85 sensor in your fuel system so the ECU can determine the ethanol mixture and therrefore "how" much fuel to inject.

But either way here in California, were running an e10 blend technically. Would it really hurt to run it as e20 or e25?

BGTV8 · 10-07-2017, 06:29 PM

E20 would probably be OK but no a lot more .... best you talk to Seb

gomer_110 · 10-07-2017, 06:34 PM

Adding E-anything is not a great idea as BGTV8 stated. You might look into blending in some Toulene as an octane booster. I've heard of this being used by some racers in the past but never did much research into mixing ratios and/or safety in modern engines myself. You should definitely do some research before just dumping some in.
-YMMV

jmroy6 · 10-07-2017, 07:18 PM

DONT add e85 to your 93 octane tune, too much ethanol will cause your AFRs to go lean. I would try some vp 100 "street blaze" before anything.

10-07-2017, 04:26 PM	#1 (permalink)
dedoom Base Member Join Date: Sep 2015 Location: Burbank Posts: 223 Drives: '09 370z Touring 6MT Rep Power: 10	Mixing E85 to boost octane I was recently dyno tuned by Seb from Specialty Z. With map 3 he told me I'll need higher octane. My question is, can I mix e85 with 91 to bring the octane rating to 93-95? My fuel system is stock. Just wondering if it can handle it.

10-07-2017, 04:51 PM	#2 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,514 Drives: 09 Nissan 370Z M6 Rep Power: 39973	Short answer is NO. E85 requires more injector flow capacity in general and you really need the E85 sensor in your fuel system so the ECU can determine the ethanol mixture and therrefore "how" much fuel to inject. dedoom and Sharad909 like this.

10-07-2017, 06:34 PM	#5 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36941	Adding E-anything is not a great idea as BGTV8 stated. You might look into blending in some Toulene as an octane booster. I've heard of this being used by some racers in the past but never did much research into mixing ratios and/or safety in modern engines myself. You should definitely do some research before just dumping some in. -YMMV __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

10-07-2017, 07:18 PM	#6 (permalink)
jmroy6 Base Member Join Date: Sep 2015 Location: CT Posts: 179 Drives: Spirited Rep Power: 235	DONT add e85 to your 93 octane tune, too much ethanol will cause your AFRs to go lean. I would try some vp 100 "street blaze" before anything. ajcool2 likes this. __________________ 2012 370z GTM SC

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10-07-2017, 06:29 PM	#4 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,514 Drives: 09 Nissan 370Z M6 Rep Power: 39973	E20 would probably be OK but no a lot more .... best you talk to Seb