Hey guys, I'm new to this forum, and I'm getting an ecu tune on my g37 this upcoming weekend, I'm running on CAI & test pipes, but I was wondering if an e85 tune will get me some good numbers & if so, do I have to change the injectors for e85 fuel?

 

I've been looking into this too... do a google search and look on Nissan 370Z Forum forums. Thought it might be promising but the more I read, maybe not....

 

Usually the pump and injectors need to be changed out for an E85 tune. Also, you won't get too great of a gain with E85 without forced induction.

 

You'll probably get like 5-8 hp. Won't be that drastic on a stock block. But if u must. Change the injectors to GTR injectors or 600cc. The stock fuel pump can handle it.

 

+1 this is pretty much what I am reading on a lot of other sites and on other cars... small hp/tq gain, loss of mileage, use more fuel, etc... If FI and properly tuned, you would see quite a bit more of a gain.

 

Yes pump and injectors would need to be changed. IMO, not worth the effort if NA.

 

pump does not need to to be changed, just the injectors. gtr injectors are preferred, if you register for GTRLIFE.com you can find people selling a full set of gtr injectors for 200ish $ shipped. I'm going to go flex fuel fairly soon, if you do decide to go that route, do it right and tune the car for everything from e10 to e85 so you can run any type of fuel you want. also the gains are much better in the midrange vs the top end, the peak numbers are not everything when running e85 on na. you will see much better gains if you are in a state like California that only have 91 grade fuel.

 

If you want a set of injectors I have some ill sell you for 200 shipped.. I'm not planning to run E85 for a few more years now.. Doing it all at once when I build my engine..

 

I'll be going flex fuel soon as well. Just trying to figure out which fuel return system to get.

 

The advantage of E85 over pump gasoline is a higher anti-knock index. Why does one need fuel with a higher anti-knock index? Higher cylinder pressure. What's the cause of higher cylinder pressure? Forced induction, or aftermarket pistons and/or cylinder heads.

If you don't plan on adding a turbocharger or supercharger, and don't plan on going with higher-compression pistons, I wouldn't bother. E85 actually has lower energy density than pump gasoline.

 

because you can run much higher timing than on regular pump gas and make power. over on the 370z site someone already proved by just switching over to e85 with no other mods and correcting for afr there's power to be made on our motors.

 

Made more power and torque across the entire band. People spend $500 on cold air intakes and $1400 on exhaust. I'd say it's worth it:

Gains from E85 (ethanol) on an N/A bolt on 370Z - Nissan 370Z Forum

 

I've been researching this topic for a LONG time now.

with E85, because of the difference in energy density when compared to normal 93/91, it requires more flow. roughly 30% over stock if you're keeping it N/A. GTR injectors or up to 650cc's work great (GTRs are 570cc). Also, at least a 255 ethanol compatible pump as well.

For further reliability, I'd recommend also a modest fuel return so you can put an ethanol content sensor there. Not all E85 was created equal~Ecutek has variable tuning map capabilities that take live feed from the sensor to make the necessary adjustments.

And +1 for what jfisher and conkus805 said. More agressive timing, cooler combustion temps, high(er) anti-knock index. Plus, I dunno where you're at, but here in GA, E85 is about 10-15cents cheaper to the gallon over 87 oct.


I'm just doing things in reverse...getting the fuel setup and e85 NOW before boost, so I don't have to tear into it once it's installed.

 

In terms of reliability, that's the point of a tune. With e85, you add more ignition and timing. In terms of gains though, it'll be like 10hp across the band. If u have forced induction plans, then yes. Go for it. But it's really not necessary to be done for a n/a application. It'll be like an ego stroke imo.

 

what you're saying is true in terms of hp, but the torque gains for na is where this mod is beneficial. the gain in midrange torque is where this mod shines in the 3-5k rpm range. imo, this is where our motor needs help the most if someone wants to stay na. ****, I spent over 1k$ on an exhaust and gained nothing more than a great sound so e85 doesn't seem like a bad idea. the key is, to get tuned via ecutek for everything from e85 to e10 so you can run whatever feul you want.