Welcome to the SR20 Community Forum - The Dash.
Register
SR20 forum logo

Thread: Fuel Ratio for E85?

+ Reply To Thread
Posts: 21-29 of 29
2014-08-12 22:49:50
#21
If you are using a nismotronic, you can use the gm flex fuel sensor. It will automatically adjust the tune to compensate for ethanol content in the fuel.
2014-08-12 23:13:09
#22
Originally Posted by ebinkerd
If you are using a nismotronic, you can use the gm flex fuel sensor. It will automatically adjust the tune to compensate for ethanol content in the fuel.


that's a nice feature
2014-08-13 22:22:38
#23
Originally Posted by squirlz
Originally Posted by gomba
I just ordered:


For like $3.50 shipped on Ebay. You can calculate out the %: Write-Up: Is your E85 really E85? TEST IT! - XR-Underground


Thats a good link, some good discussion. Might consider running E85 if i can verify what % it is.


I have a feeling 90%+ of the places have at least 85% +/- 2 in the e85. Testing is probably overrated. I mean, if you find a place that has 85% and tune @ 85%, the only way you'd run lean is if you get e95 or something. I guess you could end up with e70 and run kinda rich as well, but if you tune e85 for 12:1 let's say, then even if you do richen up you at least will not be in dangerous numbers.
2014-08-13 22:32:16
#24
Originally Posted by mirrortints
Originally Posted by BlueRB240
Any of you guys running a E85 content analyzer?


Nice, but I purchased this...


Although most good stations will know and tell you what blend they have. If it's local, it's good to test 1 station and keep using that station. I keep "2" 5 gallon jugs in my trunk of extra e-85. Filled them up around Oct. 2013 and still test at 85% ethanol a few weeks ago, since the car has been down since then.



Neat tool, I need to get one. It also looks like something a Moonshiner would use.
2014-08-13 23:22:56
#25
The e85 content issue really is a non issue. I had many many miles on my boosted nx and never once missed a beat with e 85. What it really comes down to is safety measures taken to prevent the off chance that you get a contaminated batch. This is why I highly stress using an e85 sensor. Goomba is right. In the chance that you get a bad batch, you will see it immediately on your wideband.
2014-08-13 23:37:12
#26
Re: Fuel Ratio for E85?
Originally Posted by gomba


I have a feeling 90%+ of the places have at least 85% +/- 2 in the e85. Testing is probably overrated. I mean, if you find a place that has 85% and tune @ 85%, the only way you'd run lean is if you get e95 or something. I guess you could end up with e70 and run kinda rich as well, but if you tune e85 for 12:1 let's say, then even if you do richen up you at least will not be in dangerous numbers.


We only test during spring before we get a few gallons for tuning for this reason. Gotta make sure we have 85 or else risk leaning out. If the car is tuned for a correct mix it doesn't matter when we go to the pump. A few point richer won't hurt. Few points leaner however is different
2014-08-14 16:18:06
#27
There are a few things you definitely need to watch out for when using E85 or any alcohol based fuel in these older cars/tanks.

It tends to break down any of the built up sediment that is in the gas tank and that loose crap will end up in your fuel pump pick up/injectors and anything else with a filter.

The other issue is letting E85 sit in the tank or injectors for a long time without it being driven or used. I can't even count how many times I have had to send customers to get their injectors cleaned after letting it sit for a few months or barely driving the car.

These things don't happen to every car, but it is something to certainly keep an eye on if you do enough cars using E85. We have a station right across the street and literally have done hundreds of conversions in the past 4-5 years since they put it in. About 75% of the cars will run it on a daily basis and have absolutely 0 issues with it, but the cars that sit around for months at a time it simply gunks up and can cause some interesting issues.
2014-08-14 16:52:15
#28
Originally Posted by ebinkerd
The e85 content issue really is a non issue. This is why I highly stress using an e85 sensor.


I'm confused...
2014-08-14 23:54:28
#29
Originally Posted by mirrortints
Originally Posted by ebinkerd
The e85 content issue really is a non issue. This is why I highly stress using an e85 sensor.


I'm confused...


The flex fuel sensor automatically adjust your tune. You can go from 93 to e85 and back without ever having to change your maps. So in the off chance you get a bad batch, redundancy is in place to protect the engine.
+ Reply To Thread
  • [Type to search users.]
  • Quick Reply
    Thread Information
    There are currently ? users browsing this thread. (? members & ? guests)
    StubUserName

    Back to top