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Old 09-18-2016, 07:57 PM   #1
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Default Benefits of E85 in a low-power M45 Setup

Hey guys,

So I'm gearing up to install my M45 supercharger and I'm thinking about different fueling and tuning options. The car will be M45 supercharged (No IC, Sebring Kit), MS3, RX-7 550cc injectors, Ebay Cat-back, 180 Degree Thermostat, and a professional Dyno tune unless by some miracle the logs look decent with a couple tweaks and autotune. I live in Detroit area Michigan so literally getting E85 is just as easy and convenient and pump gas.

So my question is is there any benefit to tuning for E85 versus pump gas? I'm shooting for 160'ish WHP. I do road courses and some AutoX.

Thanks in advance.

My thoughts are that the cooling benefits alone would be worth it even if the system is capped out power-wise without an intercooler.
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Old 09-18-2016, 08:08 PM   #2
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More knock resistance, which will be especially handy with your lack of an intercooler (y u no intercool?).
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Old 09-19-2016, 02:48 AM   #3
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yes
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Old 09-19-2016, 09:25 AM   #4
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You should be able to make an extra ~15whp and be safer as far as detonation. I've been logging my gas mileage and 1000 miles into switching to E85 my gas mileage is down 17%. In my area E85 is running 32% cheaper than 93, so it's actually been cheaper overall to run E85.
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Old 09-19-2016, 09:54 AM   #5
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Quote:
Originally Posted by CalebMars View Post
More knock resistance, which will be especially handy due to your lack of an intercooler (y u no intercool?).
Hahaha I'll be adding an IC eventually, but to start I'll be taking it in baby steps to take the stress off my bank account.

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yes
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Originally Posted by pdexta View Post
You should be able to make an extra ~15whp and be safer as far as detonation. I've been logging my gas mileage and 1000 miles into switching to E85 my gas mileage is down 17%. In my area E85 is running 32% cheaper than 93, so it's actually been cheaper overall to run E85.
Makes sense. Our area is surrounded by E85 so it's no extra hassle expect for the extra tuning required. Is it safe to assume 550cc injectors will support a 160-170whp supercharged E85 application? My math says it should be fine and under a 90% duty cycle.
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Old 09-20-2016, 02:17 PM   #6
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550cc should be enough. With E85 I would suspect you can run timing in the ~20s and not give any ***** about knock.. even with the ridiculous IATs from the M45. With a 1.8, 160whp should be easy mode. 1.6, still definitely doable, but may depend on if you have a pulley or not.
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Old 09-23-2016, 09:50 AM   #7
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Quote:
Originally Posted by albumleaf View Post
550cc should be enough. With E85 I would suspect you can run timing in the ~20s and not give any ***** about knock.. even with the ridiculous IATs from the M45. With a 1.8, 160whp should be easy mode. 1.6, still definitely doable, but may depend on if you have a pulley or not.
Figured it would be. It's a stock pulley setup, but I do have this: Miata Cold Air Intake for Jackson Racing Superchargers by DDMWorks Which could help a bit. Yeah if anything, the knock protection alone seems worth it when learning how to tune.
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Old 09-23-2016, 12:18 PM   #8
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Will be watching. I am taking a similar rout with my M45, but no E85 here.
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Old 09-23-2016, 03:42 PM   #9
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Will be watching. I am taking a similar rout with my M45, but no E85 here.
I'll keep you updated. Just buying the odds and ends and getting the MS3 in here this week. If it works I'll swap the injectors and go E85 before the supercharger. If all is well after some tuning I'll throw the supercharger on.
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Old 09-23-2016, 04:24 PM   #10
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My roommate, Zac, has a spark map from his 1.6 M45 E85 setup that was night and day from the 93 setup. It's not dyno tuned, but was a collaboration of "safe" E85 spark maps found around the site. His was through an air to water intercooler so he had a higher margin of safety, I was assuming his 11 lbs of boost and ~170-180hp with E85 and ~120 IAT's that he wasn't knock limited.

If you want more boost, he's got his setup for sale. You could trade pulleys with him for more boost, then he's selling the whole air to water setup, since he's going F20C swap.
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Old 09-23-2016, 09:11 PM   #11
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I had an na with an m45, that thing burned my arm a couple times when wornking around the intake LOL i had a lot of fun with that car.p
Harold at Putman Park M45 supercharged 1990 Miata - YouTube
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Old 11-28-2016, 06:11 AM   #12
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This interests me greatly.
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