E85 tuning notes
I run the same type of timing..With a good afr it refuses to knock above 5000rpms..But before that I keep it minimal just because my car spikes a bit.
you can run between 16 and 17:1 cruise on E85 without misfire and run 40* of timing at cruise.
Timing maps will generally look the same at peak boost as a pumpgas map (with more boost to makeup for it), run lower timing numbers to about 5500, ramp harder to 6k and then about 10 more degrees to 8k on a stock turbo...samples would look something like this:
This was for an ETS 57 trim on E85 with stock MAF, Stock cams, 3.5" FMIC, pipes, and 28psi. It made 440whp and like 351 torque on a dynojet that always seems to read low torque (maybe rpm sync?)
Timing maps will generally look the same at peak boost as a pumpgas map (with more boost to makeup for it), run lower timing numbers to about 5500, ramp harder to 6k and then about 10 more degrees to 8k on a stock turbo...samples would look something like this:
This was for an ETS 57 trim on E85 with stock MAF, Stock cams, 3.5" FMIC, pipes, and 28psi. It made 440whp and like 351 torque on a dynojet that always seems to read low torque (maybe rpm sync?)
I forgot to add on the timing, thats without adding in for the EGR dynamic advance tables that we messed with earlier in the year. Stock timing those can add up to 5-6* all on their own in most cruise ranges.
Yeah like rick james said...its a helluva drug
Yeah like rick james said...its a helluva drug
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No there isnt any performance gain, its only working in closed loop when the EGR is functioning from what we learned I thought? Maybe I misunderstood that point back when it first came to light. The advantage is that it adds timing during cruise automatically to help keep the ethanol firing off.
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A few notes:
Fuel economy on my second tank of E85 was 15 mpg which is only a 25% reduction in mileage compared to the 33% higher fuel requirement to hold stoich with E85 compared to gasoline. My third tank is looking to be 15+ mpg. Strange but good.
I've been doing power tuning for the last week now. AFRs are now ~11.8:1 across the rpm range. I'm still in the early stages of tuning, so I'm just working on optimizing timing with my gasoline boost curve. I started by ramping up the timing starting from 5500 rpm. I've been able to add 4 deg of timing at 7000 rpm and still no knock at all. I've picked up an average of about 15 whp at 7000 rpm, but it seems that my last change of +1 deg more timing from 6000-7000 rpm made little or no effect on power in this rpm range. The more I mess with E85, the more I get the feeling that its possible to hit MBT with no knock. I'll post up some logs and timing maps tomorrow.
Fuel economy on my second tank of E85 was 15 mpg which is only a 25% reduction in mileage compared to the 33% higher fuel requirement to hold stoich with E85 compared to gasoline. My third tank is looking to be 15+ mpg. Strange but good.
I've been doing power tuning for the last week now. AFRs are now ~11.8:1 across the rpm range. I'm still in the early stages of tuning, so I'm just working on optimizing timing with my gasoline boost curve. I started by ramping up the timing starting from 5500 rpm. I've been able to add 4 deg of timing at 7000 rpm and still no knock at all. I've picked up an average of about 15 whp at 7000 rpm, but it seems that my last change of +1 deg more timing from 6000-7000 rpm made little or no effect on power in this rpm range. The more I mess with E85, the more I get the feeling that its possible to hit MBT with no knock. I'll post up some logs and timing maps tomorrow.
I'm soaking this all up like a sponge......nice thread thanks guys 
We are getting an e85 station real close to home so i'm thinking of making the switch when it opens in th enext few months
We are getting an e85 station real close to home so i'm thinking of making the switch when it opens in th enext few months
I've been able to add 4 deg of timing at 7000 rpm and still no knock at all. I've picked up an average of about 15 whp at 7000 rpm, but it seems that my last change of +1 deg more timing from 6000-7000 rpm made little or no effect on power in this rpm range. The more I mess with E85, the more I get the feeling that its possible to hit MBT with no knock. I'll post up some logs and timing maps tomorrow.
I've found, depending on the setup, you can indeed find and pass MBT without knock.
This isn't our fathers pump gas.
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BTW, I got 15.7 mpg on my last tank with standard closed loop 14.7:1. I'm really interested in reenabling my closed loop adjustable AFR patch to see if I can get 16.5 mpg or better.