E85 Conversion
 

I have been searching the forums and can not find a e-85 conversion thread.
I am running 550cc injectors and Hydra EMS is this possible with current parts and what do I need to do to convert this? Or if anyone can direct me with a link to an E-85 conversion thread. Thanks.

Unless you plan to keep boost at ridiculously low levels (like less than 10) those 550's won't cut it. Neither will the stock fuel pump.
I'm hitting 70% duty cycles on 1000's at 17psi

So what fuel pump and injectors like 1000? and what fuel pump?

wally 255 HP

I think DW just released a 300.
I'd get that if I was looking for one right now.

thats it 1000cc's, DW 300 and some changes to the hydra map? What kinda power can I get @ 10psi on the 550's I have? Also what needs to be done in changing the ECU? Just AFR Fuel map?

No idea on power cause I don't think anyone runs 550's with e85. Its just worthless.

The whole tune will have to be redone including priming/cranking/warmup/fuel map/etc. Then to fully take advantage of the octane rating the spark map needs to be redone.

So basically everything about the tune will need to be redone.

Its a good idea to also bump up base fuel pressure with a afpr but the stocker will handle it if not (though barely).

Search. Its been discussed at least a few times already.

I could probably just get a MSII and get a base map from someone and install that with the new injectors and fuel pump then take it in for further tuning.

i've reshearch e85 for years
 

you need to calculate at least 40% more fuel is needed. 91 octane has 120,000 BTU's where as e85 has 76,000 BTU's. less thermal engergy. but it burns cooler. e85 works very well for higher compression...or BOOST!!!! i feel

when i ran it in my evo 8. i used a double pumper (twin walbro 255lbh) and 1200cc min injectors.

it wasn't all nesscary, i have seen people use just the 1000cc injectors, a single walbro 255lbh and a good (really good) tune. but overkill is the name of the game for me.... you can usally up the boost for more horsies or up the compression for quicker spool or bigger turbo. with higher compression you'll have for a much higher margin of error for tuning

It's just ballpark because dyno numbers differ due to setup, type correction factor etc
550s would probably get you in the neighborhood of 275hp, you could get a little more by upping the fuel pressure but some injectors(RC) don't like this
Given your turbo is a gt2871 it makes no sense to stay with 550s and e85. I would get 800s at least preferably 1000s
A fuel pump would be necessary. The hydra would be fine you would just need to get it retuned

im running DW 1000cc with a walbro 255 at 20psi with stock fuel regulator.
Nothing special is needed for the conversion other then a GOOD tune. Also change out your fuel filter after running a full tank of e85

how fast does everyone go threw fuel with this set up? Fuel Milage?

gas milage during normal driving isnt that different but you'll notice your gas disappear in seconds once you hit boost..:(

thinking I might scrap whole set up and just go V8 thinking 302 5.0 looks the easiest. If so I will be selling my entire set up.

I don't have a miata engine, but I do run e85. The key to success is to make sure your fuel system is up to the challenge of supplying the extra fuel needed. After that just like any fuel you will need a good tune.

I personally like overkill (over build). I run a single gravity feed bosch 044 fed by -8 line, then - 8 to an oversize fuel rail feeding ID 1000's, fuel is regulated by a rising rate weldon fpr, then return to the tank via -6. Base fp is 68 pounds. This set up will support 600 hp, I dynoed at 485, plenty of room left. Having a good safety net takes away the worries when boosting, IMO.

at part throttle. mpg is 10% less.
at wot, mpg is 30% less.

E85 lowers EGT by 200F.

E85 gave me ~8-10% more power. Shawn Church tuned it. before on 100 race gas. then drain gas, change something on the map. put in E85, 8-10% more power.

this is on my 99 Miata. didn't change a thing on fuel system, other than fuel filter after 100 miles. I was on 550cc.

trick with E85 is cold start up. when someone told me to add more fuel for cold start up, thought they meant 20% more. No, they meant 200% more. it starts right up.

to me, best thing about E85 is the smell. my nose have allergy. with sweet smelling alcohol, I enjoy my car's exhaust.

.[/QUOTE]
trick with E85 is cold start up. when someone told me to add more fuel for cold start up, thought they meant 20% more. No, they meant 200% more. it starts right up.

to me, best thing about E85 is the smell. my nose have allergy. with sweet smelling alcohol, I enjoy my car's exhaust.[/QUOTE]


lol that is so true...could also keep a can on starting fluid on tap....when i had my evo the winter was so bad on start up...i used a 70/30 in winter

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