Can anyone point me to a succinct summary of how to do this? Thanks for helpin the newb!

 

Picture is worth a thousand words



2 should be worth twice that.




phox

 

what...on...earth...does that do????? that has got to be the weirdest "mod" i have ever seen...

 

Your turbo shouldn't need it.

2001-ish through 2002 auto tranny equipped trucks, and all the 3rd gens(I think) couldn't use the boost elbow (included with most fueling boxes) to keep their wastegate from opening,
as they had a hardlined boost actuator.

The turnbuckle, or combo turnbuckle-spring, keeps the wasegate from opening and dumping boost, allowing more than the stock 19-21psi boost to be achieved.

You need more air when you add more fuel, otherwise you start melting things like pistons.


phox

 

ahhh, I see. So I could toss in an elbow then, and still be able to get higher boost?

 

Only if you had a boost fooler, which tells the computer there is less boost than there actually is, otherwise it turns down the fuel.

Most fueling boxes have built in boost fooler.

Also, have to have more fuel to make more boost, which requires more boost,
which requires more fuel, and so-on.


phox

 

ok, got it. so I should install and tap my edge comp first, then elbow the sucker. Thanks phox, for the help. its much appreciated!!

 

How much power do you need??
I can easily exceed the posted speed limits with anything I can hook onto with the gooseneck.
My truck is stock.

 

Jerry,
Could you just unhook the circlip on the vaccum actuated rod so that it doesn't operate the wastegate?

 

I'm not sure.

If you could, why the turnbuckle.

Maybe if you disconnect the actuator, the wastegate fully closes, the actuator is actually keeping it open?


phox

 

Jumping in here, if you disconnect the hose leading to the wastegate diapragm that will not keep the wastegate puck seated, and will not increase the boost- your exhaust will still blow it open, that is why there is spring tension in the wastegate holding the puck tight, increasing boost.

wastegate works like this, truck builds boost with the puck closed, compressor housing puts pressure on the wastegate to control boost, if you restrict the flow of air from the compressor to the wastegate, it will increase the boost... thats why you see the small diameter hole in the aftermarket boost elbow, it decreases the air to the wastegate and makes more boost.

Turnbuckling the wastegate shut doesnt allow the wastegate arm to travel, allowing for more boost, what your boost pressure is, well, i think it differs from autos and manual trucks, your auto has a smaller exhaust housing, will get hotter sooner if you have the boost up high.
I dont think your boost level is controllable with the turnbucke style, its just peak boost and how much fuel you throw at it... please correct me if i am incorrect about this!

I need to take a boost controller off one of my buicks, its design is real neat.

this ceramic ball type brass bleeder valve, it stops all pressure to the wastegate to a preset boost level, then allows air to the wastegate to control the boost. So it works 2 ways, it increases SPOOL UP because the wastegate is shut till the ceramic ball shifts, and it increases boost pressure with the dial...... You dont need to adjust the factory wastegate rod length.

works fairly good if you ask me
BW

 

Ah..... Now I get it.
But it would seem that in an overboosted situation, you'd be building an awful lot of heat awfully fast, creating a potentially awful situation?

 

that's the downside of disabling the wastegate, no max boost limit. an adjustable wastegate is optimum for tuning, either a spring for the HY35 (auto trucks) or an adjustable boost elbow for the HX35 (manual). neither of those stock turbos is particularly efficient above ~30-32psi (HY35) or ~34-36psi (HX35). no matter how much fuel or boost you build, you just create more heat and LESS power. hotter intake charge is less dense, i.e. less mass of air.
two things are necessary for higher boost in the computer controlled trucks:
1) mechanical wastegate control (elbow or turnbuckle)
2) electronic boost fooler to keep the ECM from defueling above ~20psi