How To: E85 Conversion

[VR4-GASM]

Originally Posted by Gushers248

If my pump outflows the need for that much line pressure without a hotwire, why hotwire it? My understanding was that because e85 needs 30% more fuel to burn correctly. and 360 x 1.30 is 468 and 450cc is 4% off which a 4% difference isn't a bad tune stock with the ecu right? or is that not how you tune?

Math...

Hopefully someone can chime in about this.

[green-lantern]

Originally Posted by Gushers248

If my pump outflows the need for that much line pressure without a hotwire, why hotwire it? My understanding was that because e85 needs 30% more fuel to burn correctly. and 360 x 1.30 is 468 and 450cc is 4% off which a 4% difference isn't a bad tune stock with the ecu right? or is that not how you tune?

Your math is correct but you will need some way of fine tuning. You will be in the ball park but not in play.

[uhlig]

30% is incorrect, it's around 20%. It's not E100 we are talkin' about here.

I would not run E85 without at least an SAFC2 and Wideband 02, since it's not always as straight forward as calculations. They'll get you close but you really need to jump in and find out what's best for you by actually using real time feedback via the WB02.

I run 780cc injectors and I have my car PLUS 17% to make it idle correctly, just a weird litle quirk that I found to be true with other cars running E85 as well. Even with say 450cc injectors, you will still need to richen it up around 15-20% or so at idle to see proper A/Fs.

[green-lantern]

Originally Posted by uhlig

30% is incorrect, it's around 20%. It's not E100 we are talkin' about here.

I would not run E85 without at least an SAFC2 and Wideband 02, since it's not always as straight forward as calculations. They'll get you close but you really need to jump in and find out what's best for you by actually using real time feedback via the WB02.

I run 780cc injectors and I have my car PLUS 17% to make it idle correctly, just a weird litle quirk that I found to be true with other cars running E85 as well. Even with say 450cc injectors, you will still need to richen it up around 15-20% or so at idle to see proper A/Fs.

Thanks for the info man.

I started to sign up for the DSM forum yesterday and between the image verification and the stupid question on my 6th attempt I said fuck it. I hate those GD things! I will try again later when I have more patience.