Converting to e85
Thread Starter
Instructor
Joined: Feb 2010
Posts: 172
Likes: 0
From: Louisiana
Converting to e85
Im looking to convert to e85 and had a few questions. First what is the best way to compensate for the 30% with hp tuners, changing the stoich to 9.7 or leaving 14.6 and adding 30% to ve table and 15% to cranking table. What is the best solution for helping with cold starts? Any other suggestions will be appreciated, I will be doing this myself via hptuners and am running open loop speed density.
Last edited by mustangracer; Aug 23, 2011 at 10:42 AM.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Depends on the year of your C5----From 2004 and later all C5's have an ethonal table in the ECM for both spark and fuel already there--they are just NOT being used---
If your car is a 2004 or newer--You can avtivate the system by adding the Ethonal fuel sensor to your car--This makes both fuel and spark adjust automatically for you regardless of the ACTUAL % of ehtonal in your tank--Every gas co. uses a different % mix--some use 70% some use 85%-- so it would be difficult to tune it correctly without the sensor--AND you will still be able to run 100% gas when needed
IF your car is a pre '04 there is NOT an ethonal tune in your ECM--
This is a harder thing to do--You would have to tune the spark and fuel tables manulally--It can be done BUT I wouldn't recc it as I mentioned it would limit the ECM to one % mix and you could hurt your eng---and you wouldn't be able to run 100% gas in a pinch---You can go to Holdencrazy and view some '04 cars to see how they tune them for ethonal--GM uses multipliers to add fuel and to add timing based on the % of ethonal mix--The multipliers add or subtract from the Gas tune
If your car is a dedicated race car that is something else--You can tune it permanently for one % mix--But you better be very familiar with the tuning software you use EFILIVE or HP--
here is the site to view ethonal tunes
http://tunefiledepot.com
These tunes use EFILIVE --- you can download a FREE demo program from their website to veiw the files-- http://efilive.com
If your car is a 2004 or newer--You can avtivate the system by adding the Ethonal fuel sensor to your car--This makes both fuel and spark adjust automatically for you regardless of the ACTUAL % of ehtonal in your tank--Every gas co. uses a different % mix--some use 70% some use 85%-- so it would be difficult to tune it correctly without the sensor--AND you will still be able to run 100% gas when needed
IF your car is a pre '04 there is NOT an ethonal tune in your ECM--
This is a harder thing to do--You would have to tune the spark and fuel tables manulally--It can be done BUT I wouldn't recc it as I mentioned it would limit the ECM to one % mix and you could hurt your eng---and you wouldn't be able to run 100% gas in a pinch---You can go to Holdencrazy and view some '04 cars to see how they tune them for ethonal--GM uses multipliers to add fuel and to add timing based on the % of ethonal mix--The multipliers add or subtract from the Gas tune
If your car is a dedicated race car that is something else--You can tune it permanently for one % mix--But you better be very familiar with the tuning software you use EFILIVE or HP--
here is the site to view ethonal tunes
http://tunefiledepot.com
These tunes use EFILIVE --- you can download a FREE demo program from their website to veiw the files-- http://efilive.com
Burning Brakes
Joined: Apr 2005
Posts: 1,123
Likes: 14
From: Booker Texas
Depends on the year of your C5----From 2004 and later all C5's have an ethonal table in the ECM for both spark and fuel already there--they are just NOT being used---
If your car is a 2004 or newer--You can avtivate the system by adding the Ethonal fuel sensor to your car--This makes both fuel and spark adjust automatically for you regardless of the ACTUAL % of ehtonal in your tank--Every gas co. uses a different % mix--some use 70% some use 85%-- so it would be difficult to tune it correctly without the sensor--AND you will still be able to run 100% gas when needed
IF your car is a pre '04 there is NOT an ethonal tune in your ECM--
This is a harder thing to do--You would have to tune the spark and fuel tables manulally--It can be done BUT I wouldn't recc it as I mentioned it would limit the ECM to one % mix and you could hurt your eng---and you wouldn't be able to run 100% gas in a pinch---You can go to Holdencrazy and view some '04 cars to see how they tune them for ethonal--GM uses multipliers to add fuel and to add timing based on the % of ethonal mix--The multipliers add or subtract from the Gas tune
If your car is a dedicated race car that is something else--You can tune it permanently for one % mix--But you better be very familiar with the tuning software you use EFILIVE or HP--
here is the site to view ethonal tunes
http://tunefiledepot.com
These tunes use EFILIVE --- you can download a FREE demo program from their website to veiw the files-- http://efilive.com
If your car is a 2004 or newer--You can avtivate the system by adding the Ethonal fuel sensor to your car--This makes both fuel and spark adjust automatically for you regardless of the ACTUAL % of ehtonal in your tank--Every gas co. uses a different % mix--some use 70% some use 85%-- so it would be difficult to tune it correctly without the sensor--AND you will still be able to run 100% gas when needed
IF your car is a pre '04 there is NOT an ethonal tune in your ECM--
This is a harder thing to do--You would have to tune the spark and fuel tables manulally--It can be done BUT I wouldn't recc it as I mentioned it would limit the ECM to one % mix and you could hurt your eng---and you wouldn't be able to run 100% gas in a pinch---You can go to Holdencrazy and view some '04 cars to see how they tune them for ethonal--GM uses multipliers to add fuel and to add timing based on the % of ethonal mix--The multipliers add or subtract from the Gas tune
If your car is a dedicated race car that is something else--You can tune it permanently for one % mix--But you better be very familiar with the tuning software you use EFILIVE or HP--
here is the site to view ethonal tunes
http://tunefiledepot.com
These tunes use EFILIVE --- you can download a FREE demo program from their website to veiw the files-- http://efilive.com
Le Mans Master
Joined: Jun 2006
Posts: 6,979
Likes: 31
From: Wichita KS
The inj size is in my sig below, I ended up having to go back to gas as the inj duty cycle was going over 110% @ 5000 rpm and my fuel pressure was dropping off, I plan on adding a return line and a adj FPR to go back to E85, its def some good stuff.
