trying to wrap my head around E10

[efizjb]

I'm trying to wrap my head around E10 and the long threads give me headaches as many times as I try to slow down and understand in simple terms


For sake of argument and calculations, can I refer to E10 stocih as 14.1 and regular fuel of 14.7 (I know there's decimals to carry out but for simplicity...) and an understanding of approx .6 diff...

Assuming stoich was set at 14.1 for ECM and LC-1 gauge was set at 14.7 (.6 difference) and for use of a AFR # say the gauge read 12.5 at WOT what would that 12.5 acutally be? would it be of more realistic of 13.1?

Now with that being said would both ECM and lC-1 set for 14.1 and gauge on a WOT run showing 12.5 would that be real, or do you still add .6 to LC-1 reading (some threads point that LC-1 is going to read actually no matter what, and this is what throws me...)

The whole E10 thing in reading the threads has me lost in what an LC-1 would read with E10, and what the LC-1 should be set at. I also understand that the point has been made to think and use EQ/lambda, not AFR, and I can learn to think that way, but if I can get the theory understood in AFR first, I can make that leap....

[mr.prick]

It depends on how you are getting data from the LC-1.

For analog you take the programmed Lambda values and stoich AFR ({B3601} ect.) and make a new PID.
For serial you change the fuel type to custom (.1 precision) and match it to your stoich AFR {B3601}.

If this is for an Fbody w/V2 & serial LC-1 simply change {B3601} to what you want, log {GM.EQIVRATIO} & {EXT.WOEQR1}
Then a new BEN factor PID can be used ({GM.EQIVRATIO}/{EXT.WO2EQR1})

[WeathermanShawn]

efizib:

Try doing a log running both a Calculated Pid for 14.1 as stoich and also 14.7 as stoich.

Leave B3601 as is. Then compare each. You will see how the percentages work.

I think Joecar and Mr. Prick have the Calc Pids. Works easier with Serial Connection.

It is not hard to calculate your two examples, but I agree it gets confusing. For myself, utilizing the Calc Pids is a far easier way to understand it.

Are you Analog or Serial?

[efizjb]

Analog. The tutorials were for analog hook up, I didn't think I would ever be using serial...this is making a little more sense

[efizjb]

Mr Prick, i just realized you have a link in your signature!

[joecar]

...
Works easier with Serial Connection.
...

+1.

[joecar]

efizjb, do you have FSV1 or FSV2...?

[Gordy M]

You might test the percentage of alcohol in your gas locally to set the right AFR. A friend was using 14.07 and we found a 120ml graduated cylinder. Put 30 ml of distilled water and 90 ml of E10 gas and mixed. Ended with 37 ml of water/alcohol solution which yielded E7 gas. Another friend in Oregon did it and found his gas (41ml) is really E11. Then change your AFR accordingly.

[mr.prick]

Good idea.
Alcohol test tubes can be found on ebay.

Maybe the EQ BEN PID could be included in the next update.

#Units            Low       High       Fmt        Expression
#------------ ---------- ----------- -------- --------------------------------------------------------------
*CLC-00-007
factor           0.00       2.00        .2        "({GM.EQIVRATIO}/{EXT.WO2EQR1})"
# ==========================================================
#Code                      PRN         SLOT            Units          System                Description
#--------------------- ----------- ---------------- --------------- -------------------- 
CALC.EQ_BEN                F007       CLC-00-007       factor           Fuel       "EQ BEN" 

[Chevy366]

Here are two tun files , one that I threw together , one has the tables from a L59 Flex fuel tune copied to it (I tried not to miss any differences in tables) and the other is just for comparison (can't open different OS tun for comparison , V8 soon) .
Notice how GM uses the VE (added 6.5 , 4000 rpm and up) , timing to compensate for E fuels and injector size and flow .
Gives us a perspective as to how GM looks at E fuel .