astra 1.4 8valve lpg turbo.
Turbo Mini Forums

i have a msd dis 4 prog on it brett ,and gaps at .8 ...runs ok through the gears until high rpm high gear ,the lambda also drops off the chart .

Edited by robert on 6th Nov, 2014.

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

Sorry I meant relative to the boost pressure not atmosphere. My thinking being the decreed pressure difference at higher boost is reducing the fueling if that makes sense.

evaporator not keeping up?

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

ahh gotcha rob , its referenced to the inlet pressure ,so at say,10 psi boost, then fuel pressure will be 25 psi.

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

well , coming back at 6.45pm , for the 2 hour drive , i may have slightly had to use a bit more boost than really eco driving would dictate , but overall with the m4 queu an all i got 29.14 ...still running around 15:1 afr below 2k rpm . and around 17.5 on cruise on the motorway . now to step those a touch leaner .

my rpm limit has gone with a new tankfull , so thats all ok .

i notice it holds around 8 psi to 5k then climbs to just below 10 . i'd like it to be stable so may get underneath and try to tighten the rod a bit . and hopefully adter this 200 miles a day till sunday , i can get it on the dyno and see how it looks .oh and swap that fw over.

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

Could the wastegate need porting a little? I'm thinking that if the rod isn't tight enough, then boost would drop off as the revs increase, but a wastegate that's too restrictive would cause the boost to climb at high revs (Not 100% sure).

yes phil ,your right ...if i wanted it to stay at 8 psi,then i would need to either port the gate or make the exhaust after the turbo more restrictive .

my plan is to aim for a 9 to 10 psi steady reading across the rev range if i can get it .

so after my 200 miles today , i got 29.66mpg ...and i was really driving eco nosity ,more 80 mph m4 and country lanes 60 ish .so i think this turbo may have given me around 3 mpg more than i was at ,for that style of driving .( although this was at a different pump ..)

.still trying to tune the smith predictor .

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

back once again ...

so finally got the big turbo on the dyno ..


i like it !





bearing in mind its on lpg ,so around 5 to 10% less powerful than petrol,i would say it would make 170 to 180 on petrol , thats around 3 to 13 bhp more than my mini on 2 psi less.

i went through various steps....


heres a boost log ...pk boost at pk bhp is 10 psi.




firstly tried a multitude of mixtures ,here are a couple...









then a test on ignition timing ..there may be a little more to get here , but im playing it a bit safe ,and remember ,boost rises from 7 to 10 psi but most of the time its between 7.5 and 9.5.









then a comparison between turbo's and over the days progress scaled to show max detail..










lastly power and torque on a 0 scale to show real smoothness levels .








boost log for last runs ...psi bit higher at 10.477psi.boost control seems erratic!






then i had a play with low rpm torque i raised and lowered timing to see what i'd gain .turns out to be around 6 lbs/ft at 1800 ,noice.







phew .lots of runs... 35 in total .. engine stayed cool throughout ,and today i might have a go at economy tuning .. i did an experiment yesterday where i held the car at 75 mph ,and changed throttle opening to replicate cruise vacuum .i did it at 10'' and 5'' hg ,and got 7 bhp and 22 bhp .so that's my range .i plan to vary settings ,and watch injector pulse width ,lower the better for the same bhp .


regards
robert.



oh couple of boring vids...



http://youtu.be/Pi79uPNxbVY



http://youtu.be/eN68ZIlO5Gc

Edited by robert on 6th Dec, 2014.

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

You appear to have a dyno in your garage. F-ing awesome.

I want to see 200bhp next and some comedy garage attire + a fake moustache!

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

your a bad man !

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

thanks phil ,,,be even better when i finish the blockwork for the next 15 ft .

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

little bit of time faffing with the iac valve .

i noticed a tocking noice coming from it this morning , so thought ,hhm something is definately happening in there , so hoicked it out ,switched on the ign ,and the pintle ground its way out and got lose.

so looking in the ms2 pages , it seems that it should come out a bit ,then retract ..and what it was doing suggested it was wired wrongly .

so i swapped A with B ,and C with D ,

this was wrong ,because i was just swapping the polarity ,and whilst i thought that may make the motor spin the other way , the pintle still came out ,and sat there slightly forlorn.

so then swapped B with D and A with C ,,so then having swapped coils i tested it , it now would out then back in a little .this seemd good , and i fired the poor abused car up , it idled at around 1300 for about 10seconds ,then went back to normal 850.(cold engine).

each time i swapped terminals i removed the pins from the gm plug .. its a bit of a faff .

only thing i have not tried is now swapping A/B and C/D to reverse polarity again .

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

It sounds like it was doing what it should in the first instance. If it was making a noise then it could be a problem with the motor rather than the wiring.

If you took the IACV out after cycling the ignition a couple of times, the pintle would have come lose. It is programmed to initially close from whatever position it may have been in.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

oh noo!!

i hope your wrong paul ..nearly put my back out doing those blasted pins .

i probably got it wrong , but id read it as , upon 'ign on' , the pintle will go to closed position ,then open up a certain number of steps ?

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

The pintle does not know where the closed position is when you turn on the ignition because it may or may not have been open when you last turned the ignition off.

So it will always "try" to move the maximum number of steps in the closing direction when you turn on the ignition, even though it may not move at all. It will then move to the cold start position depending on the CLT reading.

Sorry

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

http://www.jbperf.com/

No, we are not.

Robert is thinking that the valve will move to a specific "closed" position, whereas I'm saying that it will move as far as it can up to the maximum number of steps.

EDIT: Bear in mind that he has removed the valve from its housing.

Edited by Paul S on 12th Nov, 2014.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

ok doke , so , if i take out the iac , and strap a bar across the face of it around 5mm from the pintle ,then turn on the ignition , the pintle should move out to the bar ,stop and then move back to its set point for starting ?

and i can faff around with the wires until it does that .hopefully!

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

Yes, sometimes worth playing with the "Time Step Size (mS)" value if it is misbehaving.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

well,

good news and bad news .

on the one hand , i stuck in another iac , with a slightly different design ,and it worked ! i now have no need to brake /throttle/clutch all at the same time .


on the other hand ,it looks like around 1.5c is when the injectors refuse to click ,even with my 12v bypass relays.bummer.

i found that , if i start cranking ,then turn on the gas supply , it will start , if i dont remember to do this ,then the gas builds up to 15 psi ,and then i have to loosen a clip and bleed some pressure out to 0 before they will start to open .

hmmm. i wonder if playing with the inj characteristics might help .

Edited by robert on 24th Nov, 2014.

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

ohoh scrub that, the iac appears to have a bit of a mind of its own , starting to work after about 5 mins of driving ,and then being a bit erratic ....engine braking is an adventure ..sometimes its there ,sometimes not so much !once warm its ok .

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

so a bit more detail so i can remember where i am ..

with the idle , it works then doesn't ,then does ,then goes to 1500 then 2000 then 1500 ,and then seems to stay atound 1500.

if i readjust the c/steps page to ,say, 400 , the thing shuts and i have my 1k tickover back ,then next junction , its back up to 1500 again .

i tried increasing open steps from 150 to 160 to 170 , didn't fix it , then tried 255 , and that seemed to get it down to 1k again . i'll see what happens today .

apart from this , i now , with a ball and spring dawes device in the wastegate line , have my steady gauge 10 psi from 3100 to 7k. the guage is now on the servo line ,,,but ms2 is logging pressures around 11 to 12 psi .

,also suffering a feedback loop and surging around 20'' vac cruising ,so increased derivative to 5% on the PID.....

i think i will move my map take off from near the butterfly to a dead area off the servo take off , following the theory that air pressure oscillation around the butterfly may be causing or helping the feedback loop.


hopefully it will then log the same as the gauge.

car is now feeling fast..... ,and i need to fit some poly bushes !

oh...also moved rev limiter from 6800 to 7200 ,pulls harder from 6500 upwards.

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

well iac SEEMS to be working now , its a bit notchy with only 20c as my normal tickover possible level , but hey it works (so far).

it occured to me that it would be nice to have a mpg gauge in the car , and found out i can wack a gps thing on the ms2 ,and it will give me mpg etc .but i don't have a carputer or a way to have a permanent screen ,unless i get a megaviewer thing for 200 bucks .

so then found this ..

http://www.reveltronics.com/en/shop/17/6/o...r-utcomp-detail



which looks good , just have to rig up a sensor and magnets on a wheel or hub ,which is a bit of a pain , unless the astra has some sort of speed sensor i don't know about ?


more research needed , also need a square wave for it , so cannot use my mass of vr sensors ... i think...

Edited by robert on 8th Dec, 2014.

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

Robert does a model of Astra have abs that you can pilfer a reluctor ring and sensor that will bolt on to yours?