E85 supercharged

[1toofastlt1]

hey i have a 97 z28 with a vortech blower running about 5 psi. im still running stock injectors with the FMU. what would it take to be about to run E85? also what do you change in the tune? can someone give me the run down on E85?

[Chris]

What is your duty Cycle with the stock injectors like. Just being nosey since I am interested in boost.

[1toofastlt1]

im not 100% sure, its been a while since i've looked but i think it was 80%

[1toofastlt1]

come on you guys. I know there are a bunch of smart people on here. lol

[94Blackbird]

I'm pretty sure you'll need new lines and injectors and stuff like that. I've heard that E85 eats up regular fuel system components pretty badly. Beyond that I'm pretty clueless though, and I know there are plenty of guys on here that know alot more about it than I do.

[1toofastlt1]

ok thats good to know. thanks

[1toofastlt1]

anyone else know where i can find the info? or can someone tell me what it takes to run E85

[MoeHorsePower]

It takes a lot of E85 vs regular gasoline, so you will need larger injectors. Larger than gas, Just an example, say you would need 40lb injectors for x amount of boost on gas, to run E85 you would probably need a 60lb injectors. E85 itself is not corrosive but since it is an ethanol base, it tends to hold moisture, I am not sure if running HEET ( a water remover for gas) is recommended or compatible with this fuel. Maybe an E85 expert will chime in...

[1toofastlt1]

ok thanks, so the big boy injectors? what about tuning? I imagine tuning the timing would be the same as gas but what should the AFRs be for E85?

[MoeHorsePower]

Here is an approximate:



Air/Fuel Ratios


Fuel Stoich Rich Limit Lean Limit
Gasoline 14.7.1 12.5.1 13.2.1
Methanol 6.4.1 5.4.1 5.7.1
Ethanol 9.0.1 6.4.1 7.8.1
E-85 9.7.1 6.9.1 8.4.1




FORCED INDCUTION OR NITROUS APPLICATIONS

Fuel Stoich Rich Limit Lean Limit
Gasoline 14.7.1 11.5.1 12.2.1
Methanol 6.4.1 4.4.1 4.7.1
Ethanol 9.0.1 5.4.1 6.8.1
E-85 9.7.1 5.9.1 7.4.1

Fuel Stoich Rich Limit Lean Limit
Gasoline 14.7.1 10.5.1 11.2.1
Methanol 6.4.1 3.4.1 3.7.1
Ethanol 9.0.1 4.4.1 5.8.1
E-85 9.7.1 4.9.1 6.4.1

[ksmyss]

I'm pretty sure you'll need new lines and injectors and stuff like that. I've heard that E85 eats up regular fuel system components pretty badly. Beyond that I'm pretty clueless though, and I know there are plenty of guys on here that know alot more about it than I do.e85 is pretty safe for our cars stock fuel system components. I have some friends who have run it for almost 3 years now with zero problems. all they did was get bigger injectors and work on the tune. methonal is the corrosive alk. the only real draw back is both ethonal and methonal love to soak up water.

you will need bigger injectors and a pump upgrade if you haven't done that already. if my car ever gets back on the road it will be running straight e85.

[1toofastlt1]

ok im have the bigger inline pump so i will need maybe 60lbs injecters and tune it for 9.7 afr stoich and around 6.5 afr at WOT? thats so rich. lol Im running the aem wideband gauge, will it even read that rich?

[ksmyss]

Will a wide band O2 sensor accurately read fuel air mixtures with E85 blends ?
To get an accurate AFR reading you need to switch the meter to Lambda or equivalence ratio setting rather than AFR. Most O2 sensors assume you are running gasoline and will report a stoichimetric mixture as 14.7:1 which is the proper value for gasoline. E85 has a Stoichemetric mixture of between 9.7 - 10:1 and a max power mixture of about 6.98-8.5:1 or so, where with gasoline it is 12.5:1-to 13.1.

If you must use an O2 sensor that only reports gasoline AFR information simply divide the numbers it reports by 1.47 - 1.50.
The O2 sensors would still work. They don't understand AFR, they only understand rich/lean. If you are using regular or E10 the stoich AFR is ~14.7:1 (as you well know) and when the O2s are switching, this is the AFR it is indicating. When you are using E85 (AFR 9.765:1), the O2s will still work, switching between rich/lean. It's just that the point they are switching at is 9.765:1. You have to know what fuel you are burning to properly interpret the information the O2 sensors are providing.
Lambda 1 is always Lambda 1 no matter what you drive your car on, the o2 sensor doesn´t care if the AFR are 14,7 or 9.765... it measures the available o2 in the exhaust gases.

[1toofastlt1]

i have the AEM Uego so i can switch it over to the other setting. ok so it just sound like some 60 lbs injecters is all i need. thanks everyone