WBXlog

Big lumps of metals and spanners. Including servicing and fluids.

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Re: WBXlog

Postby itchyfeet » 10 Jun 2018, 17:01

Oh the old baffle them with science routine :rofl
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Re: WBXlog

Postby itchyfeet » 10 Jun 2018, 17:36

I was never one for chemisty but my unscientific reasoning is : a fire needs fuel and oxygen ( and a spark) 98 ron has to be a better fuel so with the same measured ammounts it will result in less oxygen left and deliver more energy.... am I wrong?
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Re: WBXlog

Postby 937carrera » 10 Jun 2018, 17:39

Alright you asked for it, simple version (nicked, not checked) :)

2 C8H18 (petrol) + 25 O2 = 16 CO2 + 18H2O

Of course petrol is a blend of different chain length hydrocarbons and other components and additives, so it's a damn sight more complex than this in reality

Now spell stoykimetrik :rofl
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Re: WBXlog

Postby 937carrera » 10 Jun 2018, 17:40

itchyfeet wrote:.... am I wrong?


only occasionally, and I wouldn't be so presumptuous :)
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Re: WBXlog

Postby itchyfeet » 10 Jun 2018, 17:42

its wasted on me
anyway the advice you should have given is a four wire rich/lean sensor is useless for anything more than an indication , wide band lambda sensor and gauge is needed to know whats really happening :D
Answer courtesey of Marco Mansi :ok
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Re: WBXlog

Postby 937carrera » 10 Jun 2018, 17:51

I can only work with the tools I'm given :)

Does this mean you're going to replace the a/f gauge with wide band lambda ?

Next you'll be adding knock sensors and changing the ECU. I'm sure Marco can help with that, from what I have read he does turbo WBX so he will certainly be on top of the fuelling dynamics. :ok
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Re: WBXlog

Postby itchyfeet » 10 Jun 2018, 19:58

937carrera wrote:
Does this mean you're going to replace the a/f gauge with wide band lambda ?



probaby if the cost is not excessive
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Re: WBXlog

Postby bigbadbob76 » 02 Jul 2018, 14:36

itchyfeet wrote:2.1 DJ Air fuel gauge
on lower revs it tends to be jumping back and fourth unless on light throttle when its lean
High revs or low revs foot to floor its mid range to rich.
To those in the know does that sound right?


Yes, assuming you have a narrow band O2 sensor, wide band ones are expensive.
Jumping back and forth indicates you're as close to ideal as the gauge will tell you.
E D I T: The ECU makes it go rich/lean/rich/lean to give you an average ideal.
E D I T: Wide band sensors will tell you if you're slightly above or below ideal as well as if you're far above ideal.

https://www.haltech.com/wideband-o2-sensors-explained/
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Re: WBXlog

Postby itchyfeet » 02 Jul 2018, 14:49

itchyfeet wrote:At higher revs it is lean with up to and past half throttle


this is what worries me

I have been told wide band are cheap now but not loked yet as I was on my holidays when I wrote that

400 miles watching a needle, well when I.wasn't watching the oil pressure, temperature, revs or the speedo bouncing :lol:
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Re: WBXlog

Postby bigbadbob76 » 02 Jul 2018, 15:01

bigbadbob76 wrote:Wide band sensors will tell you if you're slightly above or below ideal.

Sorry, I didn't write that very well, yes they will so will narrow band ones.
but narrow band ones go full scale lean when you're only slightly lean and can't tell you if you're very lean.
If yours is going full scale it doesn't mean you're dangerously lean, just on the lean side of ideal.
However if you are dangerously lean it won't tell you. :lol:
Hope that makes more sense.
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Re: WBXlog

Postby itchyfeet » 02 Jul 2018, 18:42

I knew what you meant and just looked on ebay, and they are quite expensive 200 quid ish.

So continue in blissful ignorance or blow more money :?:
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Re: WBXlog

Postby bigbadbob76 » 02 Jul 2018, 20:33

I'd expect it to be on the lean side of ideal with light throttle openings so I'd continue in blissfull ignorance.
Unless something other than the gauge suggests it's very lean I'd leave well alone, the ECU will take care of it.
That's the whole point of computer controlled fuel injection.

I did a diy fuel injection conversion on my trike engine (2cv6) so was starting to learn a bit about it, got it mapped well enough to get out and running but it needs an mot before I can get it on the road and log some runs so that's on hold due to other projects.
I'll finish it one day and learn more about it. It's a mind boggling subject.
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Re: WBXlog

Postby itchyfeet » 11 Jul 2018, 18:48

Finally got around to fitting the PCV in place of the broken breather tower now oil filler.

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Re: WBXlog

Postby itchyfeet » 13 Jul 2018, 17:46

I'm going to try a VDO oil temp gauge as this cheapo one is not very responsive.

looking at to m10x1 sensor but what connector goes on this?

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Re: WBXlog

Postby 937carrera » 13 Jul 2018, 17:53

If it's like ones I have seen before a simple spade connector, just try one
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