turbotater1

I am now at the point of working on the tune. Combo is L33 , 80 lb , 76 mm GT45 turbo , valve springs are the only engine modification for now. It has a PNP microsquirt with the " Denmah " tune loaded as delivered.

I was looking at the Required Fuel settings because as I understand it this is the major constant change for gasoline to E85 settings. Mine has a value of 14.7 which to me would indicate a gas tune not an E85 tune. I would think it would need a value of about 9.5 +- for E85 . The car starts and drives part throttle acceptable for an initial tune with slight lean surge issues . I have a displayed wideband value of 14's at idle and low 13's under part throttle acceleration .

I am just wanting to make sure stuff is ok before I start trying to make power.

Here is a thread talking about the required fuel table.
http://www.msextra.com/forums/viewto...le+e85#p388791

Here is a pic of my settings

ken6881

Sounds to me it's just set up on a gas scale instead of e85. The. Wideband really reads lambda which for stoiciometric is 1.0 then your computer or wideband controller converts that to14.7. My point is you can tune e85 on a gas scale and that's what is done many times you hear people shooting for 10.5-11.5 it's on a gas scale not an e85 scale.

tonypaul

iTrader: (2)

excatly---

I to thought the same thing when I looked over the e85 tune. I messaged Denmah/Matt and he told me that its on a gas scale..... Load the tune, start it up and start tuning...

turbotater1

so say i wanted to go back to gas if i am on a road trip with no e85 available. where are the mods at in the tune that differentiate from gas to e85?

yenkomike

iTrader: (2)

i think the best way is to close your e85 tune and open a gas tune in tunerstudio.

ken6881

Copy your tune. Put 93 in the tank and retune the car for gas keep a way to switch tunes with the car. You will have to look but pulling 30% ish fuel from the tune will get you close pull timing back and go from there.

aknovaman

iTrader: (7)

You guys are missing a huge point here.

Microsquirt has a Flex fuel sensor input wire specifically for E85 tuning. Go to the junk yard and get an E85 sensor then install it per the MegaManual. Tune the Micro for pump gas using the AutoTune feature in TunerStudio. Then populate the E85 settings so it gives you the required Lambda.

That way no matter what you put in the tank it will constantly adjust fuel and timing based upon the existing measured alcohol %. Thats what the sensor is designed for and how it works in a factory config as well as in Misrosquirt software.

Done.

turbotater1

is there a better sensor to get? Gm , Ford , car , truck etc ?

turbotater1

and i would still like to understand what the thought process was in the e-85 tune. it would make it easier to tune specifically for my car if i knew the thought process on the base tune.
If the VE table 1 is all that is modified thats just fine as i would just modify that. If there is another table that was modified for E85 it would help to know that.

aknovaman

iTrader: (7)

Look at the e85 modifier tables in Tuner Studio to see what it changes.

Also e85 is never truly e85. The alcohol percentage varies greatly from tank to tank. Especially if you mix it with pump gas. That's why you tune it for pump gas and let the sensor modify the AFR and timing based on what ever is measured by the sensor in real time (what is going through the sensor now), not what was in the tank when you tuned it.


Get the ford sensor as the fuel fittings can be unscrewed and AN fittings can be screwed into it. The GM has pressed in quick disconnect fittings. Also if you are using a return fuel line, it can be pleased anywhere in the fuel stream. Pressurized or return line.


I data log my 2002 flex suburban with hp tuners and the alcohol content of pump 87 octane is generally 13-18 percent alcohol here in Kansas.

turbotater1

i looked in tuner studio and saw no reference for an E85 modifier table , I went to the msextra forums and typed that in and found no matches. I am not sure what table you are describing.

thanxs for your help

Mike

aknovaman

iTrader: (7)

Mx3 data but it's still in the micro software too.

http://www.msextra.com/doc/ms3/flexfuel.html

http://www.msextra.com/forums/viewto...?f=131&t=40871

http://www.megamanual.com/mt29.htm#sf

turbotater1

so with the AFR target table set for 14:1 for idle cruise , 12:1 for low boost and 11:1 for high boost (remember E85) I am assuming that I would play with the VE table to do the majority of power tuning ?

I am still questioning the thought process ( not criticizing ) of the required fuel value being numbers that resemble gasoline and afr table that resembles gas as well.

LosLS2

You don't seem to be grasping that it doesn't matter what scale you are displaying. The wide band reads lambda. The number that it's displaying is just a conversion. So if you drained your tank right now of all e85 and filled it with 93 octane and the car is in closed loop, it should quickly find that same 14:1 or whatever you are targeting. The difference if you were logging it would be that the closed loop correction would be pulling a bunch of fuel because it take less 93 Oct fuel to achieve the same commanded AFR.

turbotater1

ok so correct me. the wide band reads lambda and using some math it displays some number . i have a good understanding that the O2 sensor just has a voltage output and we use some math to say X voltage = Y display .
somewhere when running different fuels with different fuel air ratio needs information would have to be changed other wise with no flex fuel type input device i could just pour in gas this tank and e85 the next tank and life would be fine.
so where is the information table at ( i am assuming VE table that is why i asked)
I have examined different strategies for tuning and it would make more sense to me if the gentleman that did the base tune was changing VE values that i would continue to change VE values instead of adding a new variable in altering required fuel as some do or AFR targets as some others do.

Maybe i am just not asking the question correctly, what makes this particular tune an e-85 tune and not a gasoline tune?

denmah

iTrader: (2)

easy answer,
leave it all alone
tune it just the same as gasoline

forget everything else

LosLS2

The values in the VE/Base fuel map primarily. At WOT, the e85 will take lots more timing also. At part throttle, should be about the same.

tonypaul

iTrader: (2)

Denmah said it best just tune like your tuning for gas. For example, in boost when your gauge is reading 11.7ish your e85 is really around 7.8ish. If your around 13.3ish the e85 is around 8.8ish.

Search for gas/e85 conversion table and it will make more sense....

My setup is almost like yours- microsquirt, 5.3, on3 76mm, 80injectors, ls6 cam, e85, but Im on a 58x motor. Depending on how soon you will start tuning, Im dyno tuning mine in 2 weeks and can send you my tune when its done if you need it...

aknovaman

iTrader: (7)

Devils advocate here.

If you tune it with E85, how will the Micro know when you are not running e85 (pump gas or mix) and make the changes necessary for Lambda?

E85 true alcohol % varies greatly and thus the true AFR will vary. Do you plan to run E85 from here to eternity at every fill up even when out of town?

So as I stated above, why not tune it for pump gas and let the E85 sensor make the real time, on the fly adjustments as designed since Micro has that capability already built into it?

All I am hearing is put E85 in the tank and tune it for that. Not why it is better in your opinion to do it that way.

turbotater1

thanxs for all responses

last night my son and i took the twin turbo firebird and his turbo malibu to a cruise spot and had plans to go to the track for his first passes down a dragstrip but there was an event at the track and we both had put in a long day so we drove back home. hopefully next week we will have a chance again.

tonypaul: I would like to see your tune when you get a chance.