astra 1.4 8valve lpg turbo.
Turbo Mini Forums

blimey tom , you have penetrated my astra thread cloak of invisiblilty lol

i think there are mk3 astras with anti lock brakes , so they must have a nice little hub n ring n sensor on them , i think a trip to the scrapyard might be in order .

also on the ecu inputs i can find on the wiring dia in the haynes book of fibs , i found an input called distance sensor , this might just be to do with parking , or might be to do with a sensor in the speedo to let the ecu know the service interval..time will tell.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

mk4 astra rear bearing with built in ABS stuff should fit i *THINK*



EDIT obv you need a 4 stud version.

If i recall correctly the fronts are like cavvy's etc of the same vintage and have traditional abs rings on the CV's and sensors in the hubs.

Edited by evolotion on 9th Dec, 2014.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

thats an interesting gizmo , thanks denis .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

I would also follows Tom's suggestion if possible, but the one Denis has just linked appears to have a two wire connector in which case it's almost certainly VR, not Hall.

And I agree with your reading of the computers instructions that it wants a square wave not sinusoidal.

For my TC setup I just used the very common VW/Audi/Skoda ring - 1J0614149 - which can be made to fit any hub with a bit of maching or a plastic sleeve - and a small Hall switch. (pictures somewhere in one of my threads).

Also, there are several aftermarket pickups which piggyback the speedo cable from the gearbox.

Re. the IACV irregularities, have you changed to the MS-Extra code yet or are you still on the old B&G code - there is so much more support/knowledge with the MS-E code.

Schrödinger's cat - so which one am I ???

Rod, im reasonably sure they are not VR sensors, but some kind of hall effect like the sensors used by ford from ~2001 onwards. if you test them with a multimeter they read different resistances depending on polarity, infact if you use a meter with a diode test function they perform like a diode.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Denis,

It's possible if they used the physical body of the sensor as ground but, as a general rule, Hall needs three connections (power, ground, signal) whereas VR just has the two alternating outputs from the coil.

I've yet to see a hall switch that relys on the body of the sensor for ground but I freely admit I'm a bit out of touch with the modern stuff.

Schrödinger's cat - so which one am I ???

they dont use the body as a ground, but i confess i dont know how they work, never looked into it. I test by using some home made extension leads to "swap" sensors on an axle to rule out an ABS unit fault, on most cars you then simply replace the abs/hub assembly on the offending side. once the wiring etc checks out. The exceptions are peugeot 307 and mondeos where the sensors are seperate (but still 2 pin non VR) and they are very susceptible to corrosion upsetting the sensor gap and crap getting between sensor and the magnetic ring and chewing one or the other up. These sensors always seem to be used with the magnets imbeded in plastic style reluctor rings, i dont think they function with regular toothed wheels

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

some googleing

http://www.bimmerfest.com/forums/attachmen...=1&d=1244685334

explans how it works, if it loads lol

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Interesting Denis,

From that link (yes, it did work) it seems the Hall element only is in the sensor and the power, ground and other bits needed to create the square wave output are in that "box" which seems to be called "DSC control module" (which then includes ground).

Hall elements by themselves are only two wires but it's very unusual to have the support bits in a separate package in normal electronics applications.

They are normally assembled as a three wire switch (with or without magnet(s) included) in one package with all three wires being provided.

The only 2 wire example I could find in Farnel's catalogue is here. All the rest are three wire.

http://www.farnell.com/datasheets/548633.pdf

So, yes, I guess a two wire hall "sensor" is possible providing the other bits needed to produce the square wave are elsewhere.

Maybe the automotive industry have just found it more economical to put the element only down in/on the hub and the other bits elsewhere perhaps particularly for ABS outside in the open (cam and crank on my Mondeo are both three wire Hall)

From your description of what you see on a DVM diode test that would certainly match the element only.

Schrödinger's cat - so which one am I ???

blimey , what a lot of good info thank you rod ,and denis , .

i have yet to find out if there is a pulse off the speedo ...

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

I remember the early GTi/GTe Astras had a digital speedo so, even though not the most common models, Vauxhall certainly had an electronic pickup of some sort available.
Whether it was off the gearbox or the ABS (did the early ones have ABS?) I don't know.

Schrödinger's cat - so which one am I ???

rod , i just noticed this bit

''Also, there are several aftermarket pickups which piggyback the speedo cable from the gearbox. ''


do you have any links to those?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

I didn't note it at the time, it might have actually been Graham who found it (we were debating how best to measure average front wheel speed for our TC setup but I went for individual sensors on the pot joints and did the averaging electronically) but if you google speedo cable adapter or speedo cable converter or speedo cable transducer you will find a few (transducer seems to be the most effective search).

Mostly in the US but here's a typical UK one (typical = expensive...)
https://www.merlinmotorsport.co.uk/p/speedo...18x1-5-sp-trans

The trick is getting/knowing the right threads. On that example they offer a few short conversion cables (inc A Series!) but vauxhall may already be M18

EDIT - typo and bit added.

Edited by Rod S on 10th Dec, 2014.

Schrödinger's cat - so which one am I ???

excellent , thank you rod .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Here you go Robert, a cheaper one
http://www.demon-tweeks.co.uk/Product.do?m...CFQrpwgodcHwAvQ

This may be the one we saw before but discounted because of the threads - I guess from the description it's M18 and your Astra will be M18 (but and A Series is not...)

Schrödinger's cat - so which one am I ???

thanks rod ,thats a nice bit of kit.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

ok wel little update , now im back from van , i have the fun of trying to start in -1.5 and lower . with the old battery on , not good ,bit hit and miss . crammed in a huge battery ,and with that ,and flicking ghe switch as it cranks , it appears to be mostly ok , unless i let it stop a few seconds after first start .then i have to get out and bleed the pressure off.

i think a bleed valve/injector feed into the inlet might be on the way .

apart from tht , i did my 160 mile commute on mon tues ,and it went well .boost is now v stable on the guage at 10 psi . but having moved the map take off to the end of the manifold , i think i may now be picking up a lower map signal to the ecu , so might have to adjust the timing a little .


re tickover , well it was all a bit up and downy ,i think due to the very narrow temp band im using ,eg 15c is 2000 rpm 30 c is 1000 rpm , so small changes in temp ,eg as you rev it ,moves the pintle ,and tickover goes up and down like a overdrawn politician.

i tried to smooth it out before my run ,and it stopped working all together.humph.

Edited by robert on 4th Feb, 2015.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

update :


fixed the cold starting by a) fitting a big powerful new battery .b) shimmed the injector coils so they could not move ,thus giving a bigger kick to the pintle inside .c)cranking then turning on the gas .

all been fine down to -5 so far.



new developments .


head gasket started allowing combustion gases into the waterway on number 1 when on boost .this got to the stage were it pushed the water into the header and starved the vap of heating ,so the thing froze and car stopped .


stripped ,and found the gasket pushed into the waterway on the screen side .fia gasket .

got a genuine payen ,and decided to re do the compression ratio for more economy ..after measuring it with the old fia gasket it was 9.77:1 ,so skimmed head on an old harrison mill ,and now at 10.14:1... will probably run lower boost .


chamber ,after 6 years looked like this ..






pretty clean, and the valves seated with only 30 seconds of grinding by hand ,no recession at all. :)


will be fitting a knock sensor ,with a visual tell tail this time.



im very excited to see what my higher cr does to economy and boost onset .

regards
robert

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Good work!

I'm waiting for the day we see you with a black sooty face with panda eyes were you've taken your goggles off.

Robert the gas man! :)

If something is worth doing, it's worth doing half of.

Robert what engine did the bigger valve cylinder head come off?

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

Never mind just seen its a 1.6 mph head :)

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

1.4 MPI mike.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM