when is a deka 80 truly done on e85
Staging Lane
Joined: Feb 2013
Posts: 91
Likes: 0
talked to a very nice tech guy at efisource and was told that as long as I can add numbers to the fuel table and it gets richer that I am not out of injector yet. he also said the required fuel numbers are a pre set of values and that is where the precieved duty cycle comes from. he said once I max the injector I will not be able to control the afr from slowly going lean at rpm but to make sure the fuel pressure is rising at that time as not to mistake a maxed out injector situation with a maxed fuel pump issue.so just add numbers and fuel pressure until I cant any more then its time for bigger fuel components.
Has anyone done this yet ? So we have an answer to when the 80s are truely out of steam. Im going to be building a 5.3 and don't want to buy injectors that are to small and have to buy again.
Anytime I’ve peaked 100% DC, upping the VE from that point did nothing to richen AFR. Sure I’ve run over 100% DC in the logs, but it’s not applying anymore fuel at that point. If you can make a pass at 100% DC and add 30% DC and your AFR richens, there is a problem with how the software is calculating the DC.
A lot of people don’t monitor fuel pressure during a run and don’t realize the injector isn’t done, but the fuel pump and /or lines are. I’ve seen 855whp on E85 on a mustang dyno. 3 255HP’s 70psi base. Car backed up the power at the track.
I think a lot has to do with the plumbing and fuel supply. Add a mechanical pump with a 100 psi base and AN10 feed and the 80’s will go pretty darn far! Not so much with a dinky pump and factory lines. Assuming you had the pump. You could run a 5:1 FMU instead of a standard 1:1 fuel pressure regulator. That way you could run at a normal 30-40psi base and have some serious pressure in boost. Would extend small injectors a ton!
A lot of people don’t monitor fuel pressure during a run and don’t realize the injector isn’t done, but the fuel pump and /or lines are. I’ve seen 855whp on E85 on a mustang dyno. 3 255HP’s 70psi base. Car backed up the power at the track.
I think a lot has to do with the plumbing and fuel supply. Add a mechanical pump with a 100 psi base and AN10 feed and the 80’s will go pretty darn far! Not so much with a dinky pump and factory lines. Assuming you had the pump. You could run a 5:1 FMU instead of a standard 1:1 fuel pressure regulator. That way you could run at a normal 30-40psi base and have some serious pressure in boost. Would extend small injectors a ton!
Last edited by Forcefed86; Sep 29, 2017 at 10:49 PM.
all I can tell you for sure is they are enuff to run a 5.3 to 22.5 psi boost and go 9.30 at 145 mph so far at 3500 lbs on e85. but we are going to the track tomorrow and we are going to see how much more they will supply. if the track prep lets us.
I know of a different car that has made 750 to the tire on e85 at 18 psi on a 6.0 as well. I think we are getting close but we will see.
I know of a different car that has made 750 to the tire on e85 at 18 psi on a 6.0 as well. I think we are getting close but we will see.
TECH Fanatic
Joined: Jan 2010
Posts: 1,074
Likes: 17
From: sarasota fl
all I can tell you for sure is they are enuff to run a 5.3 to 22.5 psi boost and go 9.30 at 145 mph so far at 3500 lbs on e85. but we are going to the track tomorrow and we are going to see how much more they will supply. if the track prep lets us.
I know of a different car that has made 750 to the tire on e85 at 18 psi on a 6.0 as well. I think we are getting close but we will see.
I know of a different car that has made 750 to the tire on e85 at 18 psi on a 6.0 as well. I think we are getting close but we will see.
Staging Lane
Joined: Feb 2013
Posts: 91
Likes: 0
Anytime I’ve peaked 100% DC, upping the VE from that point did nothing to richen AFR. Sure I’ve run over 100% DC in the logs, but it’s not applying anymore fuel at that point. If you can make a pass at 100% DC and add 30% DC and your AFR richens, there is a problem with how the software is calculating the DC.
A lot of people don’t monitor fuel pressure during a run and don’t realize the injector isn’t done, but the fuel pump and /or lines are. I’ve seen 855whp on E85 on a mustang dyno. 3 255HP’s 70psi base. Car backed up the power at the track.
I think a lot has to do with the plumbing and fuel supply. Add a mechanical pump with a 100 psi base and AN10 feed and the 80’s will go pretty darn far! Not so much with a dinky pump and factory lines. Assuming you had the pump. You could run a 5:1 FMU instead of a standard 1:1 fuel pressure regulator. That way you could run at a normal 30-40psi base and have some serious pressure in boost. Would extend small injectors a ton!
A lot of people don’t monitor fuel pressure during a run and don’t realize the injector isn’t done, but the fuel pump and /or lines are. I’ve seen 855whp on E85 on a mustang dyno. 3 255HP’s 70psi base. Car backed up the power at the track.
I think a lot has to do with the plumbing and fuel supply. Add a mechanical pump with a 100 psi base and AN10 feed and the 80’s will go pretty darn far! Not so much with a dinky pump and factory lines. Assuming you had the pump. You could run a 5:1 FMU instead of a standard 1:1 fuel pressure regulator. That way you could run at a normal 30-40psi base and have some serious pressure in boost. Would extend small injectors a ton!
might be a silly question, bare with me i'm new. If you turn up the base fuel pressure from say 43.5 to 58/70psi or whatever, are you putting a heavier load on your injectors duty cycle wise? And if so running the injector closer to 100% or over is just abusive to it ? I'm asking because I want reliability so it makes more sense for me to buy a bigger injector and run it at 70-80% if its less abusive and will last longer than to buy say semien deka 80s and run them at 120% and have them last half aslong
Ex.
43.5base 875cc at 80% to 58base at 1xxx cc at say 1xx% ?
Last edited by phluxx; Oct 1, 2017 at 01:56 PM.
