my shonkey saff has lost a bit of hold boost ,still peaking at 32psi, but it used to hold between 26 and 28psi, now its only holding 20

what do you think, im heading towards a weak actuator, as its 3 years old, and has a "bit" of pre load

cant think of any other reason tbh, no leaks etc etc

 

could be a shagged actuator

 

thats what i reckon, i will call you if i get time later ,im working at the mo as usual

 

ok mate

 

are u using a amal valve..????

 

y do you ask that pete?

as mine was disconected last time at ava and now the boost is down...

 

yeah i have an amal, hence i still have the peak figure,

 

theres no reason why u shouldnt on one of stus conversions chap he would have jetted it corectly

 

i know mate ,the set up works very very well

 

try this................seperate the amal valve....top n bottom with a thin bladed knife..........inside is a spring and weight...take them out and put back together...........the amal valve still works, but not electricaly....i've done this on mine.....

 

how can the amal valve work, if it has no internals its just an electronic bleed valve,

i need the internals to work to get a peak figure , without the amal working i would only get a hold figure.....

 

...tell u what then, dont bother..............i've just said i've done it on mine......... ...mine works fuckn fine

 

it cant work wothout internals though can it its just an empty box

its not going to bleed electronicly when controlled by the ecu ,if it has no guts, it will just be dumoping air out of the return all the time...

 

heres a bit i wrote about amals a while ago...



Amal valve,or boost control solenoid as its sometimes called, this is how the ecu controls the amount of boost the turbo makes ,like an elactronic bleed valve in effect.

it also allows the boost to have a peak and hold figure, as the boost will spike when the valve is opening, then return to its hold figure when it closes off at the top of the boost range.

some people do away with them and just fit a bleed valve in between, but then you can only run the hold figure of boost and not have a nice spike to give a tad more torque where its needed

the amal valve basicly stops the wastegate actuator seeing the full amount of boost pressure coming from the compressor housing ,it does this by opening and closing a electronic valve, which bleeds some of the boosted air to atmosphere



take this example ,your wastegate actuator is set with a small pre load, and will open at 15psi.

the turbo is making 15 psi, so the wastegate should open preventing the turbo from making any more boost, BUT the amal valve is opening and closing very quickly allowing 5 psi to escape to atmosphere, all of a sudden your turbo is making 20psi before the wastegate actuator can see the 15psi it opens at. HERE IS YOUR PEAK FIGURE,

Then as the rpm climbs ,the ecu tells the valve to stop opening and it stays closed, the wastegate actuator can now see the full amount of boost made by the turbo and only allows 15psi before it opens the wastegate to prevent any more, HERE IS THE HOLD FIGURE.
__________________

 

dont bother then........easy...........if stu@msd said it u would say O.K......mine had this problem and Grove told me what to do.....its fixed

 

if you know how an amal valve works pal, removing the guts wont make it work ,simple as.

yes the car will still make boost ,but the amal valve will not be working, tbh you may as well have thrown it in the bin, and just piped from the wastegate to the comp housing, as fundimentally thats exactly what you have done

 

i have half a hole of preload (ish) and get a spike and a held figure....if ur valve is fooked or dodgy wirering.....this sorts it out.............if u dont want help/ideas dont ask..................tell u what it'll take 5 mins to do.....its ur problem not mine.................

 

pete so how will a solinoide still control boost with its internals took out which are itengral to control air flow ?

 

He doesnt know as Grove told him to do it. Cant you read

 

if you have half a hole pre load ,the actuator will open at a set pressure, you have nothing to bleed the air off as the amal valve isnt working

my valve isnt fooked, as it still has all its interanl organs and my wiring loom is new

 

just uses the jets.............i'm no expert fella........i had a simmiller prob,thought my wastegate penny was bent........it was a dodgy valve (wich was new) or wires.............it fixed my car.........

 

its normally the jets that are re-sized/removed to aid the bleed off of boosted air ,

not the valve internals

let me guess your problem was you couldnt get the boost high enough?

 

sorry for trying to help............... .........please dont listen me anymore.................

 

mm i see where you goin my mate is a old lancia techi he used to put a jet in the pipe from the valve in his grailie to get it to produce and hold more boost but never took the internals out

 

let me guess... your problem was you couldnt get the boost high enough?

im not being arsey, i can explain how it works pal

if im right ,your boost would have been capped at about 23psi ,and wouldnt go any higher, the fix would have been to remove the restrictor from the return to air filter port of the amal valve, thus allowing more air to be bled off, the valve basicly gets drowned by the increase in boost and cant get rid of enough to prevent the wastegate actutaor opening....

 

it stopped peaking and holding as much..........this eleviates an electrical problem............try it if u want...it'll not take long.............

 

ok, so if you wanted to reduce the hold figure, a simple turn off the pre load would have done that, and by playing with restrictor sizes the exact peak figure can be acheived, although i feel i am waisting my time here

 

it dropped from 30psi to about 26/27..and held 25ish instead of 28

 

why didnt you take some pre load off the actuator arm?

 

...................i cant be arsed anymore................the boost went down.........i fixed it.....it went back up again.........simple................

 

....wires crossed

 

you DIDNT fix it

 

take an engine for example... would it still work as it was meant to if you removed the pistons?

 

pete, jtechsaff seems to know how an amal valve works, please listen to him

 

Now i know fuck all but if you rip the guts out of the valve wont it just be open and bleed air off all the time? Almost like having a hole in you vacum pipe? or am i totally off track?

 

can someone take over here, i need a drink

 

no you are bang on the mark

 

when the valve is closed (hold) the wastegate actuator will see ALL the presure from the turbo, which opens acordingly

when the valve is opening and closing (peak) a percentage of the air will be bled off to atmosphere ,so the wastegate actuator doesnt see 100% of the turbo pressure so doesnt open untill much more boost is made, when it will see enough to open

 

cant say anymore really

 

Cheers J