e85 hydra tuning - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-03-2009, 02:55 PM   #1
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Default e85 hydra tuning

anybody done any tuning with e85? i have 550's and hydra, need fuel pump and should be able to get it switched over. curious about reliability or any problems.
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Old 12-03-2009, 04:11 PM   #2
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When you switch it over to E85 you're going to need more injector than what you have. Tuning it shouldn't be any different than regular fuel other than you'll want to switch your wide-band over to lambada; because E85 runs leaner by a few points. Over-all E-85 I think if fully available is the way to go, on a built motor you'll have much more knock resistance and it's rated at 105 octane.
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Old 12-03-2009, 04:14 PM   #3
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my buddy built the car besides the mods i did. he works at fm. he has it set up and the hydra is running pretty low percentage duty cycles currently. i don't want to run a **** load of boost. prolly not much over 10-12. but i don't know the efficiencies of the different turbos if it would be worth it to stay with the ihi that i have now or upgrade to gt30r or somebada. we have 3 stations in town with e85 so why the hell not lol.
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Old 12-03-2009, 04:25 PM   #4
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Quote:
Originally Posted by mazdaspeedmx5 View Post
pretty low percentage duty cycles currently.
Just be careful. You will need ~40-50% more fuel with e85, the small turbo, low boost, and the 550s may be ok, but you may see that it is a little edgy. With a GT30R you will need monster injectors (even 1000s may not do it) and tons of fuel flow, so make sure the pump you get is ready. I did a quick calc and 300whp on e85 will just about run a walbro 190hp at a 80% duty cycle. The GT30R will obviously make a bit more than that 300whp, so you will need bigger fueling than the 190hp. Then you need a bigger regulator to handle the next bigger pump.....
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Old 12-03-2009, 04:30 PM   #5
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yea i have a regulator on the car already. i may just swap the fuel pump and run the ihi with e85 and try not to overload the 550's. might be able to crank up fuel pressure a touch to get the duty cycle under 80% and stay right around 10psi you think?
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Old 12-03-2009, 04:48 PM   #6
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Nice ****.

No thinking about it, if you are at 60% or more now with the 550s on gas, you won't be able to run more boost on e85 unless you up the reg pressure. Looking at the DIY sticky in the useful saved posts section on here, and from other posts, the max pressure you will want to run the injectors is somewhere around 75-80, so your max base fuel pressure at atmospheric will want to be at like 60. So, there is a definite ceiling on this.

If I were you and I was at 60% or less duty on the injectors, I would bring it to get tuned on the e85 and keep your pressure where it is. See where you end up with the 550s. That will give you a good idea how much ceiling you have.

Any tuner worth his salt will be able to tune with e85, only difference is stoic is 9.9.
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Old 12-03-2009, 04:51 PM   #7
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you're the man webby gotta luv peeps helping newbs especially when i post a photo of a nice rack lol
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Old 12-03-2009, 10:49 PM   #8
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Dude, I'm a noob, too, welcome to the club. I have been reading up on e85, and talking to some very smart people on it's application.

https://www.miataturbo.net/forum/t10821/

This thread has a lot of great fueling info in it, including some calculations. This helped me just this weekend when asking some somewhat dopey questions regarding AFPRs, I'm squared up on them now.

If you are thinking of running it, the extra fuel required is a real consideration. I get just barely 200 miles out of a tank now, imagine this with up to 40% higher consumption, especially if stations with e85 aren't available.

BTW, if you are friends with some people over at fm, you probably know my car. I have Jason's old red '90.
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Old 12-04-2009, 07:03 AM   #9
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yep i definitely know that car. paid quite a bit to ship that thing to ny eh? luckily for me i have 3 stations in town. and on my hydra if i have a good tune i can just check a box and it auto configures the extra fueling. i just have to pick up a new fuel pump and dial the car in on the dyno. btw i bought glens blue miata with the mazdaspeed swap that worked at fm
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Old 12-08-2009, 09:45 AM   #10
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I was thinking about going e-85 when i get my FM 2. I was able to find 1 place close to me for e-85 so I guess that will have to do
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Old 01-10-2010, 03:52 AM   #11
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Ive been running e85 for few track events now. mpg is about 30% less at wot. at street, it is 15% according to some of tuners here. octane rating is 105, but effective rating is 112 to 115. EGT has never gone above 1200.

I am running 550cc injectors, making 230whp. but I am maxed out on duty cycle.

if you have stations close to you, it is a no brainer.
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