EA82T Early Wastegate

[sundance95]

I have an XT with the EA82T, and I just installed a manual boost controller. It works fine, and I am now pushing 11 PSI, but the turbo is spooling up really fast and is wastegating halfway through all gears. Does anyone know how to fix this so that it hits 11 just after redline?

[Skip]

Sundance, your question is a bit nebulous - sorry.

We all hit max boost and "waste gate" when running hard though the gears. (The system is designed this way)

If you want (for some strange reson) to slow down the turbo "spooling" to max boost. "T" a bleeder hose into the line in place of your controller to the waste gate, trim and adjust the "bleeder" line so some of the pressure which would cause the waste gate to open is bled off.

You may want to consider a by pass valve instead.

[soobme]

So if I understand U right: U want to slow down how fast U hit max boost?!?! Uh......why?:eh:

A by-pass valve is a wonderfull thing, and good for the turbo too. If U are having the same torqu steer/ traction problems @ 11psi that I am, just use 4wd when U want to get on it:burnout:

I has made all the diferance in the world for me.

[sundance95]

I want to delay how fast I hit max boost because it is fruitless to be wastegating at 2200 rpm. The ideal situation is to hit max boost just after your shift point.

[Subarutex]

Most people when setting up turbocharged car want the full boost to come on as soon as possible. Here is the thought behind that.

 

Turbocharged cars don't have power until boost comes on. You want the biggest chunk of rpm range to be giving you full boost. Full boost for longer = full power through as much rev range as possible. Its OK to wastegate, its doing what its supposed to be doing, regulating the boost.

 

If it still is bothering you. Its really easy to fix it, turn the boost controller down.

[Skip]

sorry Tex, don't think he hears you.

Sure looks like he has the wording mxed up

maybe he means max torque RPM?

But that is where you want to hit the next higher gear ??

Wonder where he read this "fact"?

 

BTW if he turns the boost pressure controler down (i.e lower max boost pressure), don't ya think he will hit max boost (ie. wastegating) sooner, ?

The bleeder I sugg'd will leave pressure to the waste gate "vent" thus delaying the opening of the WG. This is also known as a "poor man's" boost control.

[Subarutex]

I learned this from Corky Bell's Maximum Boost. Its a great book! I think i missed the part about the bleeder. I agree that would work.

[Skip]

Tex, I to have C.Bell's book, good reading that

BTW I was questioning where Sundance got his info, not you.

 

I don't think Corky stoops to the level of the bleeder waste gate control. I should add that the bleed hose should have a small filter on it as it will suck air when the Imanifold is under vacuum

[45psi]

This is very simple, dont try to make it complicated, because its not..

 

- Take the wastegate actuator off

 

- Get a small spring, (example is a carburator return spring) something that has some spungy tension and isnt to stiff. You can go to the hardware store, junkyard whatever to get one.

 

- Loop one end of the spring around the wastegate flapper hole.

 

- pull tension against the flapper (keep tension so the flapper will stay closed) pull the end of the spring until it feels pretty tight, loop it around a spot off the block/turbo whatever, just something that it can hold onto.

 

- Go test drive, see if you boost, If its to low, put more tension against it, if its to high loosen it up a bit. Dont be worried if it falls off because then you will have 0 boost.

 

 

See the spring? now just pull tension somewhere, even the old wastegate mounting bolts might be good? probably not enough tension, but you could start their, I normally go off the block.

 

What does this do? basically its forcing the wastegate flapper SHUT, and the only way it will open is when enough pressure is forcing the flapper to open, this is where the spring tension comes into play. More tension harder it is for the flapper to open, Thus more boost. Doing it this way can make the car spool incredibly fast, but its a bitch to adjust.

[Dr. RX]

Since I taught the other Corky everything he knows (and then he goes and writes a book and gets money for my ideas), I can't believe what I'm reading here. Skip and Tex are on the right track. The wategate regulates the amount of boost being created by the turbo, if you are set at 11 psi and the wastegates starts to open at 2200 rpm (which I doubt), then that is where the turbo is creating more then 11 psi boost. If you choose to close of the wastegate, be prepared to detenate your engine. When the wastegate opens, it is just releasing the extra exhaust, not needed to create the desired boost, you will still be producing 11 psi, if not, then there is something else wrong. If you are wastegating at 2200 rpm, then that is where you have acheived maximum boost, most people I know would be happy acheiving max boost that early. In my WRX, max boost doesn't occur until somehwere around 6000 rpm, the turbo starts boosting at around 4000 rpm (and you'd better be hanging on when it does).