How Much Boost With E85?

[arrydjay]

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

[wolverine]

Are you tuning the car?

[boostn0199]

Yeah its best to ask the tuner how there confortable with it they all we have a certain boost they belive is safe and which e85 they want to tune on.

[GTScotT]

Until it stops making power or it pings.

[GTSBoy]

Or until the conrods call it a day and stop doing their job.

[Manuel Kasko]

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

[GTScotT]

Or until the conrods call it a day and stop doing their job.

Thats what I call a happy ending.

[hypergear]

I say about 20psi is the safety limit for a stock motor. Also depending on who does the tune and relevant supporting mods.

[The Mafia]

Look into one of these also

http://www.zeitronix.com/Products/ECA/ECA.shtml

[34GeeTeeTee]

Look into one of these also

http://www.zeitronix...s/ECA/ECA.shtml

Being fitted to mine this week

[SS8_Gohan]

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.

[Piggaz]

Being fitted to mine this week

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

[34GeeTeeTee]

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

Thats the plan

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]

Thats the plan

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.

[The Dan]

I'd keep it under 40psi for E85 on a standard engine. The gudgeon pins will thank you later. The turbo will fail before the engine will as long as your tuner is competant

[arrydjay]

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?

[TiTAN]

neither of the two you have mentioned.

link, vipec, autronic, haltech, etc

[75coupe]

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]

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

[Daz]

Yep get right ecu and be prepared to beef up the fuel system