hi all
first of all happy new year
i need to calibrate my etb gauge, however instructions state i have to drive car for a mile to do this. the car is not road legal yet and dont wish to be caught on roads just yet.
the manual also states you can enter a "Pulse/distance ratio"
does anyone know what this figure is?
car is using sierra running gear with 1.8 cvh engine if it makes a differnece
thanks
steve

can't you do it in the software? You should be able to put your wheel size in and it does the rest.

With mine (also etc) you rolled the wheel a couple or several times, measured the distance and divided by the number of revs (to give accurate wheel circumference. Take this number, times it by the number of magnets on driveshaft then check this off against a huge spreadsheet that was on the etb website, and enter the code onto the back of the speedo unit.

This was about 6 years ago, so things may have changed and all I've said will be of no help whatsoever

ATB

Simon

first off you need to know how many times your wheel turns in one mile

some tyres manufacturers will quote a revs/mile or rolling circumference - but you can check it by marking the tyre rolling the car forward/backward as many full turns as you have space for then measure the distance its moved.



The next bit depends on where and how the sensor is setup…

e.g. If your sensor is pointing at the 6 bolts on your driveshaft (assuming you have any) and your tyres turn 820 times in a mile then that’s: 6 x 820 = 4920 pulses per mile

but if your sensor points at the 4 magnets or bolts on the propshaft them you need to allow for the diff ratio so that would be 820 x 4 (bolts) x 3.92 (diff ratio) = 12857.6 pulses per mile

If your using the sensor in the gearbox then you'll need to find out how many pulses it produces per rev of the propshaft, say 10 pulses per turn of the prop x 3.92 (diff ratio) x 820 = 32144 pulses per mile

(someone correct me if that’s wrong - I'm not really awake yet this morning….)

There should be a note in the setup instructions telling you to round it so that it over reads slightly (rather than under reads) - i.e. your allowed to have a speedo that says your going 60mph when its really only going 57mph, but not say 60mph when your actually going 62mph



[Edited on 6/1/2012 by mcerd1]

thanks for replies.
all sounds bit more complicated than i was hopinf for but will give it a try.
there is no way of entering info into program.
i have 2 magnets on prop so i take it i multiply the figure by 2?
thanks
steve

ETB Calibration Thingy
Its a bit awkward to use as it seems you have to scroll around a bit but:
Toolbox>Calibration
Might help?

quote:

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Originally posted by flibble
ETB Calibration Thingy
Its a bit awkward to use as it seems you have to scroll around a bit but:
Toolbox>Calibration
Might help?

---

I phoned ETB. Told them gearbox, diff ratio and tyre size. They told me the number to plug into the gauge. Took about 3 minutes including the call.

Cheers,
James

quote:

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Originally posted by James
I phoned ETB. Told them gearbox, diff ratio and tyre size. They told me the number to plug into the gauge. Took about 3 minutes including the call.

Cheers,
James

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Department? They're a bit small for that aren't they? I got the feeling I was very much phoning a one-man-band type operation when I spoke to them.

TBH, it was quite a long time ago so maybe policy has changed. Shame, as they were super helpful with me over that and a few other issues.

Cheers,
James

hi james
rang them again and this time they gave me the figure.
very strange. either spoke to different guy or i caught him on a bad day
anyways all sorted now
thanks again
steve

good to know easy to sort it was easy to sort in the end, planning on ordering som,e etb gauges in the near future

Thanks guys usefull info as I have to fit on soon