I Was Going To Switch To E85...

[SS8_Gohan]

i would think of running both, i wouldn't like to rely on just one - especially widebands

wonder what the GM (saab etc) cars do in the event of the content sensor failing... maybe just really detuned, it wouldn't actually matter

[R31Nismoid]

What if the E85 sensor packs it in?

What if a massive comet comes from outer space and crashes into earth?

As long as you change the sensor out every 100,000k or 50k if you are paranoid, then you will be fine. You could also argue about the e85 sensor and changing it out, but at $500 a pop?, hmm.

What if the fuel pump FAILS!

DANGER TO MANIFOLD

[scotty nm35]

Or you could save yourself the hassle and buy the V500 Ecu instead. It's pretty much the same price as the vipec/haltech/Autronic etc but does so much more. That's the beauty of running multi-controllers.

Then you don't need the E85 sensor, you just need a wideband o2 which are approx $125-$150

That might work with an RB but VQ25det is a different kettle.

I havent needed to adjust my map as the Caltex eflex has been nothing but consistent so far, no matter what servo I fill at. I just run a simple wideband and will trim the tune if needed using the injector size adjustment on my Emanage Ultimate.

[The Dan]

That might work with an RB but VQ25det is a different kettle.

I havent needed to adjust my map as the Caltex eflex has been nothing but consistent so far, no matter what servo I fill at. I just run a simple wideband and will trim the tune if needed using the injector size adjustment on my Emanage Ultimate.

Why is the VQ25DET a different kettle? It's an engine.

It's good to be able to make those adjustments yourself but what about the people who don't know what they are doing? With the appropriate ECU, it does it for you

[Birds]

i would think of running both, i wouldn't like to rely on just one - especially widebands

wonder what the GM (saab etc) cars do in the event of the content sensor failing... maybe just really detuned, it wouldn't actually matter

Probably no worse to an oxygen sensor or air flow meter detoriating - car simply won't run at optimum performance. I don't think it's much of a safety issue. As we've discussed earlier in the thread, the varying contents of ethanol won't put the car into danger territory unless you're tuned on a knife edge...and factory cars certainly aren't. The factory fitted E85 ECUs probably monitor both AFR and E content to make sure the mix is spot on...AFR might be a backup in case of E sensor failing, or who knows, car may go into limp mode.

Ethanol sensor might be expensive, well, $500 every 50,000km (conservative estimate here) I can easily live with...and changing it over for another one would be no harder than doing your fuel filter.

[Rolls]

wideband is more useful than ethanol sensor imo, because with wideband you can adjust the tune perfectly to suit, where as with ethanol sensor you are only guessing how much to adjust it by.

[Birds]

Agreed, but I'll only be using an ethanol sensor to adjust the fuel itself, rather than the tune.

[Dose Pipe Sutututu]

wideband is more useful than ethanol sensor imo, because with wideband you can adjust the tune perfectly to suit, where as with ethanol sensor you are only guessing how much to adjust it by.

stoich for ethanol is 9:1, and gasoline is 14.7:1. Say if your using a gasoline wideband, and running ethanol, then you're going to still read 14.7

So I'm quite confused, unless I'm missing something here?

If not another solution is to run 2x types of wideband sensors, 1x ethanol, 1x gasoline.

[JonnoHR31]

if you have it tuned for 14.7 on petrol and throw in e85 its not gonna stay at 14.7, it'll be down to around 11:1. easiest way is to always leave the wideband set to petrol and tune to the same afr's as you would for petrol.

[Piggaz]

stoich for ethanol is 9:1, and gasoline is 14.7:1. Say if your using a gasoline wideband, and running ethanol, then you're going to still read 14.7

So I'm quite confused, unless I'm missing something here?

If not another solution is to run 2x types of wideband sensors, 1x ethanol, 1x gasoline.

I spoke to the guy at techedge about this. The sensor reads a lambda and the converts it back. On my wideband if you want to run a E85 corrected AFR then you just have to change a few settings.. Easy as... OR look at the lambda reading.

[zebra]

I spoke to the guy at techedge about this. The sensor reads a lambda and the converts it back. On my wideband if you want to run a E85 corrected AFR then you just have to change a few settings.. Easy as... OR look at the lambda reading.

Which TechEdge unit do you have?

I have the 2J1...

[zebra]

if you have it tuned for 14.7 on petrol and throw in e85 its not gonna stay at 14.7, it'll be down to around 11:1. easiest way is to always leave the wideband set to petrol and tune to the same afr's as you would for petrol.

Wouldnt it go the otherway? being that there is only 15% Gasoline so would show something like 18:1? or am i thinking about it wrong

[JonnoHR31]

yer my bad, other way

[scotty nm35]

stoich for ethanol is 9:1, and gasoline is 14.7:1. Say if your using a gasoline wideband, and running ethanol, then you're going to still read 14.7

So I'm quite confused, unless I'm missing something here?

If not another solution is to run 2x types of wideband sensors, 1x ethanol, 1x gasoline.

You are forgetting its not straight ethanol.

I leave mine on petrol afr's and get it tuned for around 12:1 at WOT that gives me a little play room still incase Caltex change their brew. (and that way I never get confused converting from lambda.)

[Rolls]

stoich for ethanol is 9:1, and gasoline is 14.7:1. Say if your using a gasoline wideband, and running ethanol, then you're going to still read 14.7

So I'm quite confused, unless I'm missing something here?

If not another solution is to run 2x types of wideband sensors, 1x ethanol, 1x gasoline.

yeah but if you change the fuel the relative afr is going to be out, it doesn't matter what the number is, it just matters that you realise it has changed and can tune it to suit.

most sensors read lambda anyway and convert it

[The Dan]

Lambda 1 is stoich on all fuels

[Drift Motorsport]

Exactly, there should be a Lambda table and it will trim/add fuel as required to reach the target lambda.

A failsafe solution is to use a GM flex fuel sensor 0-5v analogue input to detect the amount of Ethanol in the brew and trim/adjust the E85 map to suit and then look into having a switchable map based on less than x% ethanol for a hybrid map/petrol map.

E85 is too inconstant for my liking to be used everyday unless the servo is consistent with their brew.

[scotty nm35]

E85 is too inconstant for my liking to be used everyday unless the servo is consistent with their brew.

Petrol is too prone to detonation for my liking to be used everyday.

[SiR_RB]

How many Kms to a tank are ppl getting roughly with eflex/e85 ?

Spoke to my mate yesterday with an evo, his getting 200kms per tank @ 260awkw with eFlex...that's horrible

[scotty nm35]

On the open road I can get over 500 ks from 70L, around town, 300 to 350. Sounds like he's either running rich or likes the throttle.