Jump to content
SAU Community

How Much Boost With E85?

arrydjay

By arrydjay,
in Engines & Forced Induction

 Share

Recommended Posts

arrydjay Community Regular

arrydjay

Posted
Posted

Hey guys,

So I just bought a new turbo setup (Hypergear SS3-EG, 6Boost manifold, 50mm Turbosmart gate)

And Im going to bolt it all onto my R33 RB25 with Factory Internals.

Im planing on running dual maps with one for 98 and one for E85

I have heard that E85 allows more boost to be run safely, but have no idea where the limit is.

I was planing on tuning at 17psi for 98, what should I be running on e85?

Also, the closest servo that sells ethanol to me is in fact caltex which is e-flex which I will use most of the time.

When I tune the thing, I was planning on going and getting some proper E85, would it still be alright to run on e-flex after that, or should I do it the other way around?

Cheers

Link to comment
https://www.sau.com.au/forums/topic/400355-how-much-boost-with-e85/
Share on other sites
  • Replies 58
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Manuel Kasko Grand Master

Manuel Kasko

Posted
Posted

I was planing on tuning at 17psi for 98, what should I be running on e85?

I am currently running 20psi for 98

My tuner made it a safe tune to be able to run that.

So really depends on what he feels is good for your car.

I have seen people running 23psi on stock internals on E85

SS8_Gohan Grand Master

SS8_Gohan

Posted
Posted

what ecu?

i've never really ran more boost on E85, i know some people do... but Trent has always left the PSI the same.

if you're only running E-flex, don't tune on drum E85 - i've never seen Caltex higher than E70 - on a safe tune, driving on 85% wouldn't make a massive difference, but it's not something you'd want to do all the time.

If you've got a newer ECU which can accept a digital input, thinking about getting a flex-fuel setup.

34GeeTeeTee Grand Master

34GeeTeeTee

Posted
Posted

They're the best! Drive around and give no fark what's in the tank :D

Thats the plan :D

And yeah like SS8_gohan said, flex fuel setup is the safe way to go, but if its just running E85 there are heaps of cars doing it reliabily without it...... Just gotta remember to change the boost level under a certain % of ethanol apparently..

Piggaz Grand Master

Piggaz

Posted
Posted

Thats the plan :D

And yeah like SS8_gohan said, flex fuel setup is the safe way to go, but if its just running E85 there are heaps of cars doing it reliabily without it...... Just gotta remember to change the boost level under a certain % of ethanol apparently..

Drove on E85 without the sensor for 12 months. Didn't touch anything. Was a tad richer with the Caltex stuff (going off the wideband) but it never knocked.

arrydjay Community Regular

arrydjay

Posted
  • Author
Posted

Still in two minds about the ECU, tossing up between Nistune and PFC... Its just going to come down to whether or not I can find a PFC for the right price before Im ready to tune.

What ECU's suport the flex fuel sensor?

75coupe Grand Master

75coupe

Posted
Posted

Still in two minds about the ECU, tossing up between Nistune and PFC... Its just going to come down to whether or not I can find a PFC for the right price before Im ready to tune.

What ECU's suport the flex fuel sensor?

if your considering 'flex fuel' setup the above statement of finding an ECU for the 'right price' wont be an issue, the whole setup is exxy and cant be found at the 'right price'.... there is a whole thread on the flex fuel setup...

Link G4

Haltech

are the ECUs I know can take ethanol feedback for fuel trim... there are more Im sure...

SS8_Gohan Grand Master

SS8_Gohan

Posted
Posted

Go the G4, only a couple hundred over a PFC at the end of the day. Chequered Tuning were getting a few in so maybe see if you can jump in on that if you're keen.

Don't have to do flex-fuel straight away but if you have to buy an ECU anyway, you'd be mad not to get a flex capable one now

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • 25zenki
      S1 rb25/s14 starting problem

      By 25zenki · Posted

      Harness is for a s1 Rb25det, and it is engine and lower harness.  the old harness had broken off plugs and was in very rough condition/exposed wires and splices etc. it is not able to be put back on the car, I could visually inspect to see if they had rewired any pins on the ecu plug. The fuel pump definitly isn’t turning off it’s an external pump and very loud you can hear it. Will look at the other harness tonight, am also going to pull the fuel rail and watch the injectors spray, will update here with what I find. Pretty sure at this point it has to be something to do with injectors because car will fire up on starting fluid and cas is clicking the Injectors. Fuel pressure is steady 43psi 
    • Waders360
      M35 Brake caliper replacement

      By Waders360 · Posted

      Sorry. Front brake calipers
    • MBS206
      S1 rb25/s14 starting problem

      By MBS206 · Posted

      Check the injectors flow evenly, and are actually flowing what you and the ECU think they should be flowing. If it's starting up on starter fluid, you have a fuel issue. Is it possible under cranking your fuel pump is turning off?   The harness you replaced, is that the whole engine harness? Do yourself a test, and drop the old harness on and plug it into the Z32 ECU. It's possible they've wired things different. From memory S1 to S2 is different in RB25 and you may have a wrong loom
    • 25zenki
      S1 rb25/s14 starting problem

      By 25zenki · Posted

      I haven’t pulled the injectors to watch them spray yet but they are clicking from the cas and all of the spark plugs are wet with fuel. I’ve thought the cylinders were being flooded from the beginning and was hoping fuel pressure would fix it. Tonight I am going to pull the rail and watch the injectors spray. Don’t know how to test/diagnose if the plugs are firing in correct sequence but that should be a timing thing and as far as timing goes my car still has the half moon for the cas can only install it 1 way. And my mechanical timing is 100% correct I posted photos above. Confirmed with the balancer on and off. 
    • 25zenki
      S1 rb25/s14 starting problem

      By 25zenki · Posted

      I checked spark on all cylinders and they all visually have spark with the plug pulled and grounded, but plug 1 is the only one that fouled. This was a running swap that blew up and was rebuilt by a machine shop, put a new wiring specialties harness and did all gaskets, studs, and bolts while it was out.  compression is 135-150 across all cylinders. Aside from that from my understanding with the z32 ecu and maf the car should start regardless. The wiring for TPS and the dual 02 sensor/ dual knock sensor stuff shouldn’t actually stop the car from starting or even running well, (just slightly rich)  they just give fault codes. Car supposedly is supposed to start as long as you have z32 afm and ecu with the nistune base map and that’s info coming from a well known and trusted tuner who does a lot with SR/RB (Rsenthalpy). After more trouble shooting today where I’m at right now is that the cas is sending signal to the injectors they click while spinning the rotor, Fuel pressure is now set at 43psi, all cylinders have good compression and all of the plugs looked great (just wet with fuel) except for cylinder 1 which was very black (cylinder 1 has 150psi compression). all of the coils generate spark if pulled out and grounded out on the head. On the fuel pump car just pops into the exhaust. On starting fluid car will fire off. Hard to tell if all cylinders are firing off but definitley a couple. sounds like all of them but it’s only for 3-5 seconds hard to tell. 
×
×
  • Create New...