Yeah the stock injectors run out of fuel right around 350whp, for FI e85 I would say to go with a stealth or aem e85 pump minimum if you plan to be over 500hp the 255 in all the FI kits will be running hard on alcohol at that point.

Phunk is your entry return system (S0 or S1, can't remember the numbering off the top of my head) enough for a e85 return set up or would you recommend something more?

FYI...I wouldn't be looking at e85 for a ton more power but to give me safety on the 500-500whp I'd like to run.

im running automotive 485lph fuel pump, cjm stage 0 return fuel setup and 1000 id injectors

my only problem is i still have most of my water/meth kit still hooked up from when i had the stillen. and i am thinking should i just rewire the water/meth kit back in to work with the turbo or just remove it and go fuel e85 ( closes station is 20mins away):confused::confused:

Agreed, a big pump is a must for a boosted e85 370z. I was only thinking of all-motor use when I said I think a stock pump would be good-to-go for E85.

The S1 kit will do about 600rwhp Dynojet with E85 with the Aeromotive pump and 1000cc injectors (maybe more?) pending everything else. It can be a little different from car to car. The higher boost pressure you need to make your power, the earlier you will max-out the fuel system setup (this is due to pressure differentials and pumps reduced output at higher operating pressures)... also the more conservative your tuning is, same thing.

The 370z is super sensitive to this stuff as 1 psi can be 30-40hp and 1 degree of timing can be 20hp. So imagine that a guy running 2-3 degrees more timing can make a lot more power on the same fuel volume.

But until I swapped to my S2-SE fuel system a couple months back, I was running a one-off setup that was lesser than my S1 kit, and I made 586rwhp at 9psi E85, and used to run a little more boost on the street. So I know its good for it.

E85 with a Stillen supercharger?
 

You need at the bare minimum:
-1000cc injectors
-320+ lph fuel pump
-full fuel return system
-a talented tuner who will have to write your maps from scratch

It's a huge pita and probably not worth it for SC applications. Makes more sense for turbos but I'm super stubborn. If you want to see the pain I went through trying to get this done, check out my build thread.

For reference I am using:
AEM 320lph fuel pump
Injector Dynamics 1000cc injectors
CJMptorsports stage 1.0 fuel return system

My final tune will be 10/15 and will post my dyno sheet results. I am shooting for ~530whp or so.

Edit: Let me tell you about how fun it was to load up four 5 gallon containers with E85 and haul them to my tuner...

E85 with a Stillen supercharger?
 

Not if you're supercharged and you want dual maps for both E85 and pump gas it's not. My fuel pressure spiked to 71 psi on 93oct when the bigger fuel pump and injectors went in. Dremeling out the swirl her only dropped it to 68psi.

Edit: Phunk is probably right if you are ONLY going to run E85 but E85 stations are not all that common and you need to have a backup plan that doesn't involve a flatbed unless you get stranded (or you're building a dedicated track car)



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Yes the fuel pump module needs modification to support the large fuel pumps, or you get the idle pressure spike! I have the Walbro 400 in there and I have pressure under control (50 psi at idle).

haha Phunk, I had no idea that was your design! It was between the CJM kit and the AAM kit and my tuner had a lot of nice things to say about you guys.

I was all over the place at idle. Once you got the motor warmed up it got ~tolerable~ but not "safe". I upgraded just to end the headache. It took a meeting of the minds between Hill's, CJM and Z1 to come to the conclusion that my original assessment (before we started the build) that I needed a FRS was correct. Even a stopped clock is right twice a day right?

Other stuff from this thread as I am getting caught up:

You are correct. This is why I went down the E85 road. That and being a "special snowlflake"/first to do something weird and (maybe) unnecessary. I am not expecting a huge power bump. If that happens though, you guys will be the first to know.

Agree that this is unlikely. My 645cc injectors were nowhere near sufficient.

Ya it can take some messing around to get the idle pressure right with a big pump. But its unrelated to the return system mostly, as its a problem with how the fuel pump module re-purposes the return fuel to power a couple of restrictive venturis. But being that your car is boosted, I would have done/recommended the return system for the sake of fuel volume on top. With E85, you would be pushing it and most likely see pressure drop near redline.

I think a confusing thing that is causing a lot of back and forth in the E85 threads is the 2 different interpretations of "what is needed for e85"?

When people ask this question, they can mean it one of two ways:

1: what is needed for fuel system compatibility with e85
2: what is needed to support the flow/volume for e85

But rarely specify which of the 2 they are asking.

The replies come in the same 2 flavors, and again, nobody specifies which question they were answering.

So I would like to reiterate here that for the sake of E85 compatibility, nothing in the 370z needs to change. For the sake of E85 flow/volume requirements, most people will need injectors and/or pump, and maybe a RFS, pending what they already have in there and how much power they intend to make.

It didn't work out so you bought a different car? holy crap lol

Are you saying I won't be able to have a pump gas tune and E85 at the same time?


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I don't want E85 if it going to make me drive a FRS!


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The answer to that is in the question: Has anyone tuned a 370z with gasoline/93 and 1000cc injectors?

I tried and wasnt able to get it to run clean... but it was also my very first time even opening up the UpRev software. Thats why I originally made the switch to E85, as a bandaid to water down my injectors since I wasnt able to get them to run clean. But I got hooked on it and never looked back.

I wouldnt be even remotely surprised if more experienced UpRev tuners have done it without a problem. Heck, I might even be able to if I tried again now.