Just wondering if I can switch back and forth between maps? What I mean is if I go out of town on e85 and the gas is getting low can I just reflash the car for 93 oct, then when I am within a reasonable range of e85 stations I could flash back to e85?
I plan to have upgraded injectors and new pump.

 

i think the only problem with this is that, once your low what are you going to do, sit at the station at literally let it putter till its outta gas and shuts off?, cuz E85 is very potent gas, and if you were to have some left in when you switched to 93, or just had some and threw a tank in over top of it, i just don't see it going well. But i have no experience with it, i would wait till someone with some hands on comes in to really make your decision, im just going from the "Joe Blow instinct".

 

There is the Tephra mod that allows dual maps. All you need to do is hold down a button (usually cruise control). However, we are unlucky and own 09 Ralliart which do not have a Tephra mod maps. You can PM Tephra to see if he will consider making one foe the 09s.

 

Its not that serious switching back and forth. Here in Oregon we have E70 for ethanol and our regular premium is actually E10. If you had 1 gallon of E70 left in the tank and filled with premium you'd be at E14 which the ecu would easily be able to adjust for within the fuel trims.

 

Yes you can get a dual map set-up, pretty common. The stock ECU allows for 2 maps, inter-changeable at your discretion. There is no harm to the car from this. I don't think you need the Tephra patch for 2 maps, as his patch allows for multiple different maps (up to 8 IIRC); a competent tuning shop will be able to set u up correctly. And FYI, you will need a new fuel pump and injectors to accomplish this

 

You either need the TephraROM or COBB.

OEM stock roms do not offer map switching capabilities.

The advantage to the TephraROM is that it can instantly switch while driving. Advantage to COBB is you can have more than 2 maps.

However the new TephraROM will have more then just 2 maps offered.

 

I was under the impression that the stock ECU can hold 2 ROM's, but you will need to create a patch for switching (i.e. cruise control, etc). Is that not the case for these cars?

 

You just described the TephraROM.

 

I thought the Tephra patch has several more features to it. hmmmm, ok thanks
Edit: oh der, yeah. You still use his patch for the switching capabilities, but don't necessarily need to use the various other features

 

TephraXmod v1 has two things - map switching and KnockCEL.

Rich

 

kk i understand what your saying, but there still is a difference between ETHANOL, and 93 which is gasoline. I would still assume you cannot just throw a flipping full tank in over top of a quarter tank just cuz your running low. map switches or not they burn at very different levels.

Maybe im grossly overestimating the situation, but ive never used the stuff, its nowhere close to me.

 

Ethanol and gasoline are mixed already... E70 is 70% ethanol, 30% gasoline. Yes, you can just mix it cause its already a mixture. You just want to make sure you're almost empty, gas light on and you're good.

Also, don't assume E70 or E85 is absolutely perfect. Buschur has shown different stations to differ, they can be a good deal off. You may think you're getting E85 but end up with E7x or E9x just due to variances. Make sure you're fuel trims are solid for each tune, then the small difference should be adjusted out with a bit of driving naturally by the ECU.

BTW, I'm trying to simplify this so hopefully I'm not over simplifying and glossing over something. Ive been running ethanol since 2006, its not as mystical as you're thinking it to be.

 

i understand its not some form of magic, i just want to make sure that all grounds are covered before people tell the poor guy that you "can" do it. But that its not a intelligent thing to do, I'd rather him be informed then misinformed. That's what we are here to do! we are allies in the same cause.

 

And Im trying to explain to you that their is no "you probably shouldnt" to it. You keep trying to say you cant or shouldnt, but you CAN. Its how most people swap back and forth.

 

hows about instead of acting like an ignorant *** on the forums, you comprehend that there was only two sides to this thread before i spoke up, one side stating the generic now understood fact, that there is indeed a map. The other a man who does not have experience and asking the question(the OP). I was merely attempting to stimulate better answers for the op, which will help him understand, and be more comfortable with what he is about to perform to his car. But you put posts up like "its not magic" or the random post above which gives no vital information other then to down what i am trying to say or derive from you and others.

to attempt to move on........we DO NOT, I REPEAT DO NOT HAVE "E" ANYTHING IN MARYLAND, you cannot compare e70, e10, e whatever to 93. Who is to say that they have the same in texas..... I understand its gas but it is different fuel none the less. Doing some reading i saw that E85 can burn anywhere from 94octane to 110 octane according on who the manufacturer is of the product. That would be obviously higher then 93.....derp. Also doing some further reading on it, from other forums people were saying that it was safe to put the gas in over top of the other(93 on e85, and vice versa) as long as you, do it when she is near empty, and you do not perform WOT until its burned out. As someone stated in the nasioc forums when switching back from 93 to E85, it is imperative that you do not do any WOT or heavy boosting until you are for sure that the mixed gas has been depleted.

http://en.wikipedia.org/wiki/E85

http://en.wikipedia.org/wiki/Petrol