Caltex Gets Set To Pump Up E85

[icer]

'if the fuel is good quality'....exactly....how do you know? Will they have a reading on the bowser or something? lol....I suppose we could just tune it with a bad batch (as in whatever the lowest reading it will be). And anythgin with a higher reading is just a bonus.

[PSYCHO XRT]

So do several components of the fuel system need to be upgraded in order to run this fuel?

I hope we dont need to or this exercise can become quite expensive.....

[Panda Eyes]

to run on full e85 you'd need bigger injectors. 50/ 50 mix with 98 ron should be ok...

[wiresquire]

What is the absolute minimum that's required for an xr6t to run on pure E85?

Forget about power, performance, whatever. To just reliably run on E85, what's required? Any difference between BA series 1 through to latest FG? xr6t vs f6?

Edited 06/08/10 11:52 AM by wiresquire

[icer]

id say big injectors 1000cc? Donno how the nizpro 72lb's would go. internal fuel pump (and most definatlly recommended, a surge tank + external pump). Could go with new fuel rails and lines as rubber is no good and will most likely brake away over time.

[straughsberry]

Bigger injectors and fuel pump. You can work out your extra fuel requirements by using a higher BSFC for e85. Typically, a BSFC of .6 to .65 is used for forced induction engines. I used .65 to be safe for my big banger build.

For e85, I'm reading anywhere from 20%-30% more fuel is required. So if you multiply your BSFC by 1.2-1.3, you can work out how much more flow you'll need from your injectors and your fuel pump. Depending on what pump/injector setup you have, it will mean either a higher base fuel pressure setting or bigger pump and injectors.

Some calculations I used to work out injector and pump requirements. For normal fuel I used a BSFC of .65 and 'safe' duty cycle of .9:

To work out your injector flow:

fuel flow per injector = ((BHP x BSFC) / # of injectors) / safe duty cycle

To work out an injectors flow if you increase base fuel pressure:

new flow rate = old flow rate x √(new pressure / old pressure)

To work out a 'safe' max BHP figure for an injector:

max safe BHP = ((injector size x number of injectors) x (safe duty cycle)) / BSFC

To work out required injector size:

required injector size = √(rated pressure/new pressure) x required flow

To work out how much pressure your pump will need to work against (delta pressure):

delta pressure = fuel rail pressure + manifold pressure (boost)

To work out fuel pump BHP potential:

fuel pump BHP potential = (fuel pump capacity (lb/hr) / safe duty cycle) / BSFC

Edited 07/08/10 03:47 AM by straughsberry