E85 Roush what’s needed?

[JVO21303]

What is needed to run e85 on a Roush setup. I am getting conflicting information. Any help would be appreciated.

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[K4fxd]

@engineermike

Mike should be able to help you out.

 

[engineermike]

Yes I have lots of info but I need to start with a few basic questions:

Is it a gen3?
Roush phase 2?
Are you wanting flex?
Is it otherwise stock?
Are you hamstrung by what tuners make you do?

 

[JVO21303]

Yes I have lots of info but I need to start with a few basic questions:

Is it a gen3?
Roush phase 2?
Are you wanting flex?
Is it otherwise stock?
Are you hamstrung by what tuners make you do?

Gen2 coyote
Stage one Roush
Built engine rods and pistons

 

[JVO21303]

Yes I have lots of info but I need to start with a few basic questions:

Is it a gen3?
Roush phase 2?
Are you wanting flex?
Is it otherwise stock?
Are you hamstrung by what tuners make you do?

And by flex you mean be able to go back and forth between 91 and corn? And i asked vmp what was needed to run corn and the said I need about 3g in parts new fuel system and injectors

 

[K4fxd]

FLex means just that. Pull up to a pump and put in 93 or E85 and run it. No tune change required.

 

[JVO21303]

FLex means just that. Pull up to a pump and put in 93 or E85 and run it. No tune change required.

I would like it to be able to switch tunes because people saying flex tunes are not as good when corn isn’t available

 

[K4fxd]

So you want dedicated.

 

[JVO21303]

So you want dedicated.

Yes one for 91 one for corn

 

[engineermike]

I’ve found that you can get way further on a single dead headed pump than most believe. A dw400 on a bap will support a lot of power. That said, the gen2 fuel system control isn’t nearly as forgiving as gen3.

Are you at stock compression ratio?

 

[JVO21303]

I’ve found that you can get way further on a single dead headed pump than most believe. A dw400 on a bap will support a lot of power. That said, the gen2 fuel system control isn’t nearly as forgiving as gen3.

Are you at stock compression ratio?

I have a dw400 already and what is a bap? My compression is 12.6 that’s why i wanted to see how much it would take to run corn.

 

[engineermike]

I have a dw400 already and what is a bap?

Fuel pump voltage booster to 18-22volts. I've hit low 700's lb/hr of fuel flow from a single DW400 at 22 volts. However, the boost from 18 to 22 was definitely diminishing returns. Fuel pressure was dropping into the 50's at that rate, though. It's enough to feed a Whipple 3.0 at 16 psi through a Gen3 at 7600 rpm in the 40-50 deg ambient range.

The problem with the Gen2 is that the computer (and logging) is blind to fuel pressure. So basically, the PCM assumes some pressure falling at high fuel flow and accounts for that in the pulsewidth calculation. But it doesn't know how much the pressure is actually falling. So, if the fuel pressure isn't what it thinks it is, then it has to use fuel trims to account for the drop in pressure. Furthermore, the Gen2 default is to NOT cut throttle if the injectors go static. This is an easy fix in the tune, though.

My compression is 12.6 that’s why i wanted to see how much it would take to run corn.

Yikes! That's sky-high for a supercharged port-injected motor! There's a lot of power on the table for you on E85...

 

[JVO21303]

Fuel pump voltage booster to 18-22volts. I've hit low 700's lb/hr of fuel flow from a single DW400 at 22 volts. However, the boost from 18 to 22 was definitely diminishing returns. Fuel pressure was dropping into the 50's at that rate, though. It's enough to feed a Whipple 3.0 at 16 psi through a Gen3 at 7600 rpm in the 40-50 deg ambient range.

The problem with the Gen2 is that the computer (and logging) is blind to fuel pressure. So basically, the PCM assumes some pressure falling at high fuel flow and accounts for that in the pulsewidth calculation. But it doesn't know how much the pressure is actually falling. So, if the fuel pressure isn't what it thinks it is, then it has to use fuel trims to account for the drop in pressure. Furthermore, the Gen2 default is to NOT cut throttle if the injectors go static. This is an easy fix in the tune, though.



Yikes! That's sky-high for a supercharged port-injected motor! There's a lot of power on the table for you on E85...

Thank you for your input. So pretty much upgrade the fuel system so I don’t run lean. I got a better understanding of why.

 

[JVO21303]

Fuel pump voltage booster to 18-22volts. I've hit low 700's lb/hr of fuel flow from a single DW400 at 22 volts. However, the boost from 18 to 22 was definitely diminishing returns. Fuel pressure was dropping into the 50's at that rate, though. It's enough to feed a Whipple 3.0 at 16 psi through a Gen3 at 7600 rpm in the 40-50 deg ambient range.

The problem with the Gen2 is that the computer (and logging) is blind to fuel pressure. So basically, the PCM assumes some pressure falling at high fuel flow and accounts for that in the pulsewidth calculation. But it doesn't know how much the pressure is actually falling. So, if the fuel pressure isn't what it thinks it is, then it has to use fuel trims to account for the drop in pressure. Furthermore, the Gen2 default is to NOT cut throttle if the injectors go static. This is an easy fix in the tune, though.



Yikes! That's sky-high for a supercharged port-injected motor! There's a lot of power on the table for you on E85...

I do have Arp main and head studs with cometic head gasket

 

[DrewT]

This thread has me wondering about a gen 3 coyote with Roush phase 2 SC. What would E85 do in that setup?

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