Jump to content
SAU Community

Recommended Posts

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

  • Replies 139
  • Created
  • Last Reply

Top Posters In This Topic

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

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.

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

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.

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.

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.

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.

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...

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

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.)

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

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.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
    • Yep, this bit another local owner. I caught it before putting the transmission back into the car, what I noticed was the pressure plate fingers weren't flat and even. It's more obvious with the pull style clutch because the throwout bearing ring was visibly not flat once everything is put together. Nismo should really update their instructions to call out this specific detail. I'm not even sure the clutch as-shipped orients everything properly.
×
×
  • Create New...