e85 afr on a procharged car 11psi.
04-08-2012, 07:44 PM
#1
e85 afr on a procharged car 11psi. I am switching my ta over to e85 and wanting to know what my target e85 afr should be under boost. On 93 octane I run it around 11.5 to 11.7 from 4500 to 6200 rpms. I am going to run my wideband on a gas scale so 7.0 is equal to 10.5 afr. 7.0 is what I am hearing as being rich side afr under boost for a e85 car. Is this correct? What is everyone running in their e85 cars? Thanks for the help.
04-08-2012, 09:35 PM
#2
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on my particular application, LQ4/z06cam/241 heads/4l60/tc78, we logged faster acceleration in the 10.8-9 range.
We spent a few hours that day testing different things, everything from what some would consider very lean, 12.3 down to the "normal" 11.3-5 area, and we went quicker going fatter.
This was just our particular application, and ive hear similar stories from other people, as well.
I have no time slips to prove this, just logs timing 0-100 on the same stretch of road over and over again.
We spent a few hours that day testing different things, everything from what some would consider very lean, 12.3 down to the "normal" 11.3-5 area, and we went quicker going fatter.
This was just our particular application, and ive hear similar stories from other people, as well.
I have no time slips to prove this, just logs timing 0-100 on the same stretch of road over and over again.
04-09-2012, 08:30 PM
#5
Fired it up this evening on e85. Initially it fires right up. Long term fuel trims are pulling quite a bit out so I am taking some fuel out of the ve table in a few areas. The exhaust smell is hard to describe. I like it, lol. Going to drive it on Wednesday so I will update with how it does. Thanks, Josh
04-09-2012, 09:10 PM
#6
im hearing about e85 mixtures being different each time the tanks are filled at the station which offers an inconsistency and in the event you are pulling max timing would require on the spot tuning almost after each fillup...so to avoid this I am guessing timing will be kept more conservative, and I am wondering what timing you are running and would love to see if it can be kept there without consequence.
04-10-2012, 04:17 AM
#7
im hearing about e85 mixtures being different each time the tanks are filled at the station which offers an inconsistency and in the event you are pulling max timing would require on the spot tuning almost after each fillup...so to avoid this I am guessing timing will be kept more conservative, and I am wondering what timing you are running and would love to see if it can be kept there without consequence.
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04-10-2012, 03:30 PM
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im hearing about e85 mixtures being different each time the tanks are filled at the station which offers an inconsistency and in the event you are pulling max timing would require on the spot tuning almost after each fillup...so to avoid this I am guessing timing will be kept more conservative, and I am wondering what timing you are running and would love to see if it can be kept there without consequence.
04-11-2012, 08:53 PM
#9
I drove it today and wow. I love it. I noticed that the car pulls real strong throughout the rpm range. I am getting a slight pop out the exhaust in the 5000-5500 rpm range. I tried glancing at the wideband, but couldnt see what it was doing. I was trying to keep the car straight, lol. I think its too rich, what do you guys think? Otherwise the car is a freaking beast with this fuel. Coolant temps seems to be quite a bit cooler as well.
Last edited by Cam72aro; 04-12-2012 at 08:13 PM.
04-12-2012, 08:50 AM
#10
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I have had good results running my setup around .72 on the lambda scale with a e95 blend. I'm currently running 11-14 psi with 22* timing. I probably have around 1500 miles with no issue. Here's a more informative scale.
04-12-2012, 11:05 AM
#12
I run a mixture of 25% E85 and 93. I seem to get most of the benefit of having strait E85 without as bad of DD mileage. It also makes tuning it a little easier. If I notice it seems a little lean on the WB, I just go to the gas station and put a gallon or two of 93 in it and it will richen it up without having to mess with the tune. If its fat, I just leave it and let it be fat and happy. I shoot for 11.2-11.5 AFR in boost 
04-12-2012, 11:40 PM
#13
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I run my almost stock LM7 5.3L engine on E85 and around lambda 0.80 on a street tune with 11.5 psi boost and ramping ignition from 11 deg to 18 deg@top rev range 6700rpm.
TR6 plugs seems to be ok for that.
It almost maxes out (injectors see about 82-83% DC top rev range) Siemens "83lb" injectors @3.5bar base pressure on boost referenced fpr.(945cc@3.5bar)
Twin external Bosch 044 pumps.
On mustang dyno it outputs about 535 rwhp through unlocked converter and 4L60E with Ford 8.8 rear , small 63mm turbo.
On engines with 2.5 times more power output per liter i usually lean out more up to lambda 0.83-0.85 in racetune , EGT´s usually maxes out @880 deg C on a qmile run with good traction on those engines.
On street tunes/longer engine loads on those engines i have tuned the egt sensor/injection to start adding fuel when passing 880-900 deg C EGT´s , initially in steps of 2% and increasing if egt increases over time.
Difference when switching from gasoline to E85 is about 100 deg C.
Mixing fuel (gasoline/E85) is not recommended if not constantly monitored with WB lambda.
I only mix RedLine SI-alcohol to the E85.
Unfortunately i haven't had the opportunity to monitor incylinder combustion pressures when tuning/maxing out ignition (mbt) , it has only been to reference on what dyno output in power is.
Tuning of ignition until max power is passed and then backing of ignition.
The "professionals" say that E85 i harder to ignite but burns faster resulting in higher top peak pressures.
TR6 plugs seems to be ok for that.
It almost maxes out (injectors see about 82-83% DC top rev range) Siemens "83lb" injectors @3.5bar base pressure on boost referenced fpr.(945cc@3.5bar)
Twin external Bosch 044 pumps.
On mustang dyno it outputs about 535 rwhp through unlocked converter and 4L60E with Ford 8.8 rear , small 63mm turbo.
On engines with 2.5 times more power output per liter i usually lean out more up to lambda 0.83-0.85 in racetune , EGT´s usually maxes out @880 deg C on a qmile run with good traction on those engines.
On street tunes/longer engine loads on those engines i have tuned the egt sensor/injection to start adding fuel when passing 880-900 deg C EGT´s , initially in steps of 2% and increasing if egt increases over time.
Difference when switching from gasoline to E85 is about 100 deg C.
Mixing fuel (gasoline/E85) is not recommended if not constantly monitored with WB lambda.
I only mix RedLine SI-alcohol to the E85.
Unfortunately i haven't had the opportunity to monitor incylinder combustion pressures when tuning/maxing out ignition (mbt) , it has only been to reference on what dyno output in power is.
Tuning of ignition until max power is passed and then backing of ignition.
The "professionals" say that E85 i harder to ignite but burns faster resulting in higher top peak pressures.
Last edited by MarkoLBR; 04-13-2012 at 12:07 PM.
04-13-2012, 09:22 AM
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Stock turbocharged OEM engines @WOT with E85 /75-100hp per liter output run lambda 1.0 under 3500rpm with moderate ignition.
Full boost @2000rpm.
Lambda@rpm:
3500rpm 0,96
4000rpm 0,94
4500rpm 0,94
5000rpm 0,94
5500rpm 0,92
6000rpm 0,88
6500rpm 0,85
Requirement for cooling of the engine components increases as rpm amongst other things increases,thus the increased amount of fuel.
This is OEM tune , and lambda only
Regards Marko
Full boost @2000rpm.
Lambda@rpm:
3500rpm 0,96
4000rpm 0,94
4500rpm 0,94
5000rpm 0,94
5500rpm 0,92
6000rpm 0,88
6500rpm 0,85
Requirement for cooling of the engine components increases as rpm amongst other things increases,thus the increased amount of fuel.
This is OEM tune , and lambda only
Regards Marko
Last edited by MarkoLBR; 04-13-2012 at 09:44 AM.
04-15-2012, 12:41 AM
#16
I think I am actually done with e85. I might save it for the dyno for some numbers, but the mileage I am getting is downright stupid. I am going to go back to 93 for now. I am on the fence about dumping the procharger and doing a twin turbo setup.
04-15-2012, 08:33 PM
#17
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What are you seeing for mpg? I'm on the fence about switching to E85. Making 600hp 600 ft/lbs with 10psi on a conservative tune. Only have 1 E85 station within 5 miles, the rest are 15 or so miles away. I've already got a very limited range with 91 octane.
