Another E85 Question

[rletzgus]

Hello,

I sent email to Andy at Dynotuneusa to get a custom tune.

I've been thinking(uh-oh). How come the predator does not have the range in the machine to adjust your own custom tune? i.e. Higher LTFT's or Spark. Wouldn't an E85 tune just be that, being able to adjust the LTFT's high enough to get 16:1(or so) stoichemetric burn for E85? Timing could be advanced pretty high cause isn't E85 like a 101 octane gas? I'm not confused i'm dissappointed that predator is not that adjustable. Just a thought.

[06MonteSS]

Depending on composition and source, E85 has an octane rating of 100 - 105...

16:1???!!! holy craaaap!!

good thing you can't adjust for that then, cuz the stoich value/point for e85 is only about 9.7:1.

[rletzgus]

Yeah, oops I was mistaken it did say 9:1 on Wikiedia. Either way I was looking @ my predator and wil l adjust the injector slope to -40 percent. We'll see what Andy from Dynotune says.

[S10HotRod]

We'll see what Andy from Dynotune says.

Please let me know. I have been thinking about getting the E85 tune since 93 just went to $4.06.

[06MonteSS]

wow, $4.06 is cheap!!!

I pay $4.38 for Mobil 93 here in CT...

[rletzgus]

I might go on a limb and when my gas is gone put like 3gal. E85 in and see what LTFT's look like. If I can't go high enough I'll just put some gas in it to dilute it back. If I can adjust LTFT's to 0 I guess just go from there with the tune with timing and such. Because an O2 sensor measures oxygen content left over after burn of fuel. Stoichometric of all fuel is LTFT of 0 percent. Correct? I may try it.

[CANUCKPREDATOR]

$4.38 I'm equal to 4.75 for regular, 5.03 for premium and my city is surrounded by oil wells :(:(:(:(:(

[mikel]

I have at least one customer who has tuned for E85 using the Predator itself.
I will say though, as soon as Andy saw what he was doing, he flipped and told me he'd rather send the guy a free tune than have to hear about how he blew the car up, so take that for what you will....

[rletzgus]

Mike,

Isn't LTFT's for O2 sensors the same for all fuel that have oxygen as the cat?

"An oxygen sensor, or lambda sensor, is an electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed. It was developed by Robert Bosch GmbH during the late 1960s under supervision by Dr. Günter Bauman" Wikipedia

Excess or no oxygen means, rich or lean condition? I hate to take away Andy's business, but I am not offering a service, but isn't this something that Diablo Predator is capable of?

[mikel]

Yeah, but your 02 sensors are looking for a 14.7:1 stoich value, not the stoich value of E85, so the corrections will be way off.