Questions about e85 tuning
Mar 11, 2007, 06:47 AM
#1
Questions about e85 tuning
I plan on adding about 30% fuel in the boost areas, what about vacuum? Will I need 30% more fuel there as well?
Any fuel addition needed for start up? Any other pointers?
Any fuel addition needed for start up? Any other pointers?
Mar 12, 2007, 07:10 PM
#2
Once you get the cruise and idle areas of the map running good, see how much tweaking you did to that area of the map, and adjust the load area accordingly (leaving it rich at first of course) and do the whole log and adjust a bunch more.
Lots of power can be gained with timing adjustments, but I am not as comfortable doing something like that myself.... all my initial tunning was done at Buschur and I have not touched the timing map at all since then, just minor adjustments to the fuel map due to the difference in gasoline concentration in variouse blends of E-85 from seasonal changes.
Keith
Mar 12, 2007, 09:05 PM
#3
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You're going to need double the amount of fuel. Like. 14.7 Gasoline = 9.04:1 Ethanol = 1.00 Lambda. 11.1:1 Gasoline = 6.82:1 Ethanol = 0.76 Lambda. Watch your Injector Duty Cycle. Setup an alarm if it hits 85%
Mar 13, 2007, 12:18 PM
#4
You have the wide band O2 sensor integrated in your AEM? Best advice I have is to add 30% to all areas of the map and then log your O2 sensor and make adjustments as needed. The 30% is just a "ballpark" figure to get you started.
Once you get the cruise and idle areas of the map running good, see how much tweaking you did to that area of the map, and adjust the load area accordingly (leaving it rich at first of course) and do the whole log and adjust a bunch more.
Lots of power can be gained with timing adjustments, but I am not as comfortable doing something like that myself.... all my initial tunning was done at Buschur and I have not touched the timing map at all since then, just minor adjustments to the fuel map due to the difference in gasoline concentration in variouse blends of E-85 from seasonal changes.
Keith
Once you get the cruise and idle areas of the map running good, see how much tweaking you did to that area of the map, and adjust the load area accordingly (leaving it rich at first of course) and do the whole log and adjust a bunch more.
Lots of power can be gained with timing adjustments, but I am not as comfortable doing something like that myself.... all my initial tunning was done at Buschur and I have not touched the timing map at all since then, just minor adjustments to the fuel map due to the difference in gasoline concentration in variouse blends of E-85 from seasonal changes.
Keith
Mar 14, 2007, 06:33 AM
#5
From our testing on E-85 we almost have double our fuel use. At 37lbs of boost and 2000cc of meth we were at 75% duty cycle with 1600cc injectors on the AEM.
When we were tuning for max power the E-85 likes to run lean like 12.0-12.2 all my data logs show no knock at the drag strip with it being at 12.0.
Now when we switch to the Meth and E-85 maps the meth wants to run rich and the E-85 wants to go lean lol. We have E98 mixed with 92oct showing up today and will post dyno #s soon.
As for start up in the cold Ive had to really run it lean to start up on the E-85.
When we were tuning for max power the E-85 likes to run lean like 12.0-12.2 all my data logs show no knock at the drag strip with it being at 12.0.
Now when we switch to the Meth and E-85 maps the meth wants to run rich and the E-85 wants to go lean lol. We have E98 mixed with 92oct showing up today and will post dyno #s soon.
As for start up in the cold Ive had to really run it lean to start up on the E-85.
Mar 15, 2007, 06:30 AM
#7
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Mar 16, 2007, 06:21 AM
#8
my 880cc are at 80% on 22psi and 93 pump gas with the 20GLT. I would go to 1000CC
I am thinking about switching to E-85 but i will have to get 1000cc injectors and the dual pump set-up also
I am thinking about switching to E-85 but i will have to get 1000cc injectors and the dual pump set-up also
Mar 16, 2007, 06:42 AM
#9
Buschur said the 880's would be ok with the dual pump set up. We'll see, I should have it installed shortly.
Mar 16, 2007, 03:35 PM
#11
I hope that is true about the 880cc working with the dual pumps. I can save some money then. My car is freak or i know what im doing cause im useing way more fuel than i already should be.
Are you running the stock turbo?
Are you running the stock turbo?
Mar 17, 2007, 02:30 AM
#13
Do any of you have an O2 sensor that has units that are calibrated for E-85? NOPE!
An oxygen sensor is just that, and oxygen sensor... it has no idea what your air fuel ratio is. Calculations done in the control unit based on the assumption that you are running gasoline will give a 14.7:1 A/F ratio at the stoichiometric ratio (lambda = 1) no mater what fuel you are running. The AEM can change units for different fuel, but it is pretty pointless since we are all familiar with the units used for gasoline and since the AEM does not have a E-85 setting in the units for the O2 sensor anyway.
Simply put, under WOT 11:1 is rich, 13:1 is lean, and somewhere between 14:1 and 15:1 for idle and cruise conditions. If you try and tune to 9.7:1 A/F ratio with your O2 sensor units still set for gasoline you will have trouble even getting the car to run let alone get it to run well.
Keith
An oxygen sensor is just that, and oxygen sensor... it has no idea what your air fuel ratio is. Calculations done in the control unit based on the assumption that you are running gasoline will give a 14.7:1 A/F ratio at the stoichiometric ratio (lambda = 1) no mater what fuel you are running. The AEM can change units for different fuel, but it is pretty pointless since we are all familiar with the units used for gasoline and since the AEM does not have a E-85 setting in the units for the O2 sensor anyway.
Simply put, under WOT 11:1 is rich, 13:1 is lean, and somewhere between 14:1 and 15:1 for idle and cruise conditions. If you try and tune to 9.7:1 A/F ratio with your O2 sensor units still set for gasoline you will have trouble even getting the car to run let alone get it to run well.
Keith
Mar 17, 2007, 08:42 AM
#14
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""Do any of you have an O2 sensor that has units that are calibrated for E-85? NOPE! ""
Why yes I do, my LM-1 can be calibrated for almost any fuel you care to run or custom set to almost anything for an AFR. Not as simple as just adding 14.7 pounds of air to 1 pound of fuel. But you're right it's much easier for most people to just look at it from a gasoline point of view.
Why yes I do, my LM-1 can be calibrated for almost any fuel you care to run or custom set to almost anything for an AFR. Not as simple as just adding 14.7 pounds of air to 1 pound of fuel. But you're right it's much easier for most people to just look at it from a gasoline point of view.