I cannt get my boost any higher?

[jpedro]

ive run many turbos with wastegates removed, and i know many other people who do it to and have never seen a problem yet,? what happens to the turbo that you might have to replace it. i get no turbo flutter when i let off like most turbos and i get boost like a turbo would normally boost it just doesnt go up to as much preasure as i think it should, it goes to 15 and just sits and i have no boost leaks anywhere i can tell so it must be the waste gate not closin properly against the hoursing. o have to pull the downpipe and see whats going on, just have to put some penetrating fluid on the studs and wait a couple days just keep adding more keep it wet so the shouldnt be to hard to pull.

[stewardc]

My Garrett T3 will boost up to 30 psi easily, but you need one of these.

http://www.vwdiesel.net/forum/index.php?topic=18289.0

[jpedro]

that cover is just as good as putting a Bolt in place of the BOV spring.... so i have to still wonder if im only limited to 15psi cause the wastegate isnt close all the way how can i tell its got some huge honey comb deleee on there.... and the waste gate has no vacum control on it, only operated by boost pusing it open it says KKK on the turbo so is 15 the limit?

[gldgti]

My vote is for something nobody has yet mentioned - the wastegate spring has gone soft!

If the wastegate spring is soft, the exhaust pressure will push the WG valve open..... no more boost.

My VW T3 is currently a bit tardy and only lets me have 20psi, with wastegate disconnected. To ge a little more, I actually plumbed vacuum to the wastegate can to try and hold it shut, but the diaphragm is leaky so i only got about 2psi more :-(

i've lately been considering removing the top of the wastegate can and making a kind of spring balance for the valve, so all I have to do to adjust the boost pressure is to adjust preload on a spring, and let the wastegate open with exhaust pressure as its normal function.

[Smokey Eddy]

you do not want to block your wastegate. you want a boost controller. if you block your wastegate, you will be replacing the turbo sooner rather than later. and you get FULL boost at like half pedal now, instead of full boost with full pedal.

unless you set your build up right. I have no boost control and she drives beautifully. no excess boost ever.
40-50 mpg and she'll see 30psi if my foot says so. it is possible to set it up to not need any boost control but thats just my personal experience.
people think that if you have no boost control you run 100 psi on idle or something?
the only time the turbo is going to wear excessively is when it's boosting outside it's efficiency range and when does that honestly happen? when racing and when merging onto the highway and passing people...
small turbos i guess there is a problem?
is my T3 considered large?

[Smokey Eddy]

My vote is for something nobody has yet mentioned - the wastegate spring has gone soft!

If the wastegate spring is soft, the exhaust pressure will push the WG valve open..... no more boost.

My VW T3 is currently a bit tardy and only lets me have 20psi, with wastegate disconnected. To ge a little more, I actually plumbed vacuum to the wastegate can to try and hold it shut, but the diaphragm is leaky so i only got about 2psi more :-(

i've lately been considering removing the top of the wastegate can and making a kind of spring balance for the valve, so all I have to do to adjust the boost pressure is to adjust preload on a spring, and let the wastegate open with exhaust pressure as its normal function.

Edit: people will say im stupid and im going to waste my turbo but i never see pressures over 11psi in normal driving anyways (which is the stock max setting)

fill the holes with JB weld and you will see limitless boost only controlled with fueling. thats how i run mine and it's perfect.

[Rabbit on Roids]

you do not want to block your wastegate. you want a boost controller. if you block your wastegate, you will be replacing the turbo sooner rather than later. and you get FULL boost at like half pedal now, instead of full boost with full pedal.

unless you set your build up right. I have no boost control and she drives beautifully. no excess boost ever.
40-50 mpg and she'll see 30psi if my foot says so. it is possible to set it up to not need any boost control but thats just my personal experience.
people think that if you have no boost control you run 100 psi on idle or something?
the only time the turbo is going to wear excessively is when it's boosting outside it's efficiency range and when does that honestly happen? when racing and when merging onto the highway and passing people...
small turbos i guess there is a problem?
is my T3 considered large?

when i had the WG disconnected on my audi, it made way too much boost, i would get 15 psi before 3000. and i wanted around 20 right before wide open.

you dont have enough fuel for your turbo yet ed. if your pump were turned up, you would need some sort of boost control. josh has a K24 with no wastegate and it spikes 44 psi. i dont want that kind of uncontrollable boost. my VNT has no WG, and it makes about 30 psi maxed out, and it sounds like the compressor wheel is about to fly apart. lol.

[Smokey Eddy]

Yes Kevin, but the point im making is that you never see those numbers unless your foot is on the floor.
my gauge will pin if i hold my foot down in 3rd from about 50-110km/hr

but i see what you are saying, you want the engine to run much richer than it would if  it were allowed all the boost the turbo is making. i see i see.

[MJF]

Itīs the fuel that makes power. If you have to control boost with fuel, you wonīt make real power.

[Rabbit on Roids]

Itīs the fuel that makes power. If you have to control boost with fuel, you wonīt make real power.

yes, thats what im saying... i would get way too much boost for the amount of throttle that i had. and then i would back off the throttle, because i only had a 30 psi gauge and it would peg it fairly easy.

[jpedro]

so how do i go about checking to see if my wastegates stuck open a bit whats the best/easitest route seeing as its so tight between there and the firewall.

[Rabbit on Roids]

so how do i go about checking to see if my wastegates stuck open a bit whats the best/easitest route seeing as its so tight between there and the firewall.

you can see the wastegate if you pull the downpipe off. it points toward the brake booster.

[arb]

My vote is for something nobody has yet mentioned - the wastegate spring has gone soft!

If the wastegate spring is soft, the exhaust pressure will push the WG valve open..... no more boost.

My VW T3 is currently a bit tardy and only lets me have 20psi, with wastegate disconnected. To ge a little more, I actually plumbed vacuum to the wastegate can to try and hold it shut, but the diaphragm is leaky so i only got about 2psi more :-(

i've lately been considering removing the top of the wastegate can and making a kind of spring balance for the valve, so all I have to do to adjust the boost pressure is to adjust preload on a spring, and let the wastegate open with exhaust pressure as its normal function.

Edit: people will say im stupid and im going to waste my turbo but i never see pressures over 11psi in normal driving anyways (which is the stock max setting)

fill the holes with JB weld and you will see limitless boost only controlled with fueling. thats how i run mine and it's perfect.

I welded an aluminum plate over the hole my BOV left when I removed it. JB will work to, I just love using my TIG. After my issues in divorce court are over (5 years after it was "final") then I'll install my EGT and close off my waste gate ;-)

[Rabbit on Roids]

running with a blocked off wastegate is a bad idea tho. just unhooking it isnt as bad, because at around 30 or 40 psi drive pressure, the exhaust will blow the wastegate open no matter what, just as long as it can physically still move. if you weld it closed or block it with something, it will not let any gasses by no matter how high the drive pressure gets. and then your turbo MIGHT commit suicide. and may take your engine out with it.

[gldgti]

Roids is right - when i had hte prothe merc t3 on, i bolted the wastegate shut because the actuator fouled on the firewall (a3 chassis). i turned the fuelling down about 3/4 of a turn from where i had it with my t2, and i could easily peg the guage (30psi) at less than full throttle (and way under full revs). i continually had to wuss out of going fast for fear of making something explode.