as mlr is down its time to ask people who know about this stuff lol

on my evo my car runs an external watsegate, now for some strange reason i cannot get past 20psi of boost

my boost controlleris maxed out no more boost, it did run 24psi but since i had proper pipes madeup on the controller its wont do no more

but even then it will only do 24psi, so would this be the cause of my wastegate not being strong enough? i couldnt tell you what it is or what spring is in it as it was the car when i bought it, just know it says 38mm

if its not the wastegate then surely it cant be the turbo

im just stuck now as the car isnt punhy anymore, screamer pipe isnt opening either

 

sounds like a weak spring or faulty controller, there are alot of cheap wastegates out there..

 

posisbly, ive emailed the company for the controller, and the wastegate, i have no idea on what spring is in it at all

just dont understand why it cant go past 1.5bar

 

what controller is it? is there any makers mark on the wastegate?

 

its a gizzmo controller, no markings on the gate anymore lol, just read 38mm

 

if your screamer pipe do not open then your turbo is making all the boost it can as the wastegate is closed ,so i would say your turbo is faulty or you have a boost leak .

 

If it was a week spring your screamer pipe would be working earlier than before.

 

if i put it on low boost the screamer pipe works lol

i cant see how the turbo can not push more than 1.5bar considering they can push 2 bar

 

Take it to your tuner, only way to sort it

 

nearest tuner is miles away, and for something i can check myself id rather do before forking out labour charges only to say turbo or wastegate lol

 

Is your boost gauge accurate ? Does the engine run fine ?

Have you changed anything prior to this problem occurring ?

Is the controller plumbed correctly ?

Is the solenoid working ?

Is all plumbing clear and free from blockages ?

And can you explain exactly what you mean by the section I highlighted ? Ive no idea what "proper" pipes are.
But seemingly if that's the only change that has been made...they cant be that "proper"

 

i hope you got your controller plumbed for external wastegate and not internal, wat ports are you using on the solenoid?

 

easiest test is unplug the feed to the wastegate, but keep a very close eye on the boost level as it could go very high.
at first it sounded like a weak wastegate spring, but reading on it sounds like there is a reason why it won't make any more boost and not wastegate orientated.
boost leaks could be the cause though or cream crackered turbo.

 

yep, wastegate has been tried both ways, originally set up like actuator but is set up for external and no difference what so ever, even if boost controller maxed out still only gets 20.4psi, i dont go by boostgauge becuase the gizzmo records the boost pressure

pipes are banjo fittings that i had made up, i do have a feeling that i have a boost leak off turbo elbow into intercooler pipe, but its always had this and its very slight, last time i done a pressure check i wasnt losing much or it was very slow to release anyhow and that was at 2 bar

i will try taking the pipe off the wastegate to see what happens, if it goes past 1.5bar then ill know its not turbo

it should run 25 psi, i know 5 psi isnt a lot but it makes a hell of a difference on this car

maybe time for a gt35 and see how long a std engine lasts lol

 

are you increasing gain and duty? and are you using closed or open loop?

 

tried both ways

open or closed no difference, no spikes or even coreection just its it target and holds

duty and gain maxed out still the same cant get no more out of it, anything from duty 50 and gain 70 doesnt do anything

 

i would be sticking a good old bleedy on it and see wat it does then, but stiil have your controller plugged in to keep i eye on levlels,

 

have you changed anything else since running 2BAR previously?
if not, then something is getting tired i'd think, check for play in the turbo.

 

No play in turbo iI've pull vac pipes.off.compressor and wastegate and will only push 20 psi lol

 

is there a blockage in the exhaust?
could be creating too much back pressure and so not make any more power.
pop a pipe off and see if that helps, take cat out, could have collapsed.

 

Does that post mean you've tested it, or are going to test it ?

So you've removed all the boost control pipework to the actuator, and it still only makes 20psi ?


Is it a laggy 20psi, or does it spool as normal ?

Either the w/g is fucked, the exhaust is blocked, you have a massive air leak, or the turbo is fucked.

Gain access to the w/g to ensure it is fully closed and then apply compressed air to test it's operation.

 

exhaust isnt blocked, its decatted with, its a 3 inch system all the way through, even the turbo elbow has been changed, exhaust isnt an issue lol

ive tested turbo with pipes disconnected, it boosts to 20 psi like normal and doesnt do anymore

what im thinking is becuase the actuator is still attached even though not connected the pressure inside is opening the internal wastegate so the external one isnt doing its job properly

ive just took the actuator off and replaced it with a threaded bar and wound the internal gate shut so this will never open again unless the nuts come loose

the external wastegate has been taken apart and all is fine with no splits rubber,, still dont know spring pressure though but you can squeeze it

ive just done a boost leak test, and its a very slight leak where i knew it was leaking from before when i had 25psi, ive done my best to shut it up, but think ill need a new one

boost controller will be piped up as actuator settings this time for testing, now looking on the website my pipes before went like this

turbo to number 3 and wastegate to number 1, on the website they show it as turbo to number 3 and wastegate to number 2 so will swap these over and see if it makes a difference

if nothing works now, then its getting a full on hard pipe kit and a bigger turbo and manifold lol

some pics of the bar to keep penny shut and what wastegate it is

 

got it working

must of been the std actuator opening under pressure, not anymore with that simple threaded bar mod

gauge is spiking at 28psi and holding 23-25psi, its fluctuating for some reason between the two but think the controller is doing that

boost controller reading 25.6 psi aswell and my screamer pipe is all working again

finally simple fix all good, now to blow it up for a stroker kit lol

 

if only you said that you have a internal wastegate aswell as external..... at least it fixed..

 

i did, i said the actuator is still on but no used somewhere

 

Maybe on another forum, but not here

 

no your rite i never did i

never even said it was the std turbo, can see i was stressed leaving vital info out

but ive sorted it now

 

i'm glad we were of no use
as soon as i read that post with a second actuator i suspected spring failure, as did most after reading that too.

 

the thing is, the actuator has never been plumbed in, no pipes nothing, so its job was just to hold the penny closed which it was doing, but it must of been the exhaust pressure pushing it open slightly

got there in the end, gona have a play with the controller later to get my desired boost as im not keen on it spiking to almost 30psi else ill see a rod through the block