freddysEF

Hey everyone, i just have a question about the tail waste gate. I have the 38mm with 11 psi spring, do i have to have a boost controller or just having the spring will be fine??

Or what are some ideas you guys have?

TheShodan

iTrader: (14)

11psi means that 11psi (based upon a good vacuum source) is the minimum amount of boost that is allowable. anything more, requires a boost controller

fv8s

a tail is a part of an animals body, like a dog or cat. TIAL is a company that makes turbo parts. and TheShodan is right.. if you want to boost more than what your spring is rated you need a boost controller. the wastegate doesn't just magically make more boost when you snap your fingers

freddysEF

ok so i dont need one? i dont mine being at 11psi for a while

mechanix619

No, you don't need a boost controller unless you want to make more than 11psi.

HamiltonRex

don't be alarmed if you see slightly more then that (tuned properly ofcourse) due to some manifold/wastegate design, it can't regulate boost pressure exactly as per spring. Especially on bigger turbo's

samuraijackass

What map sensor are you running?

fusion645

I was wondering myself that question. Im using a 3 bar map sensor and will be boosting more than 11psi. I always thought they could up the boost on a tune? and i always thought, if you got a boost controller...wouldn't that ruin the tune? because you would be putting more air than fuel into the motor causing it to burn lean or rich? That what i though of.

Silva Bullit DC4

Aftermarket MAP sensors don't do anything more but allow you to run more manifold pressure (boost) than your stock MAP sensor can read (which is an estimated 10.5 to 11 psi max). As stated earlier, some turbo manifold designs have odd wastegate flange placements that will cause boost creep, resulting in your WG spring to read more psi than its desired rate. If you are running a pressure related reference source to your WG (ie: turbo compressor housing), you may see at slight psi drop (1 to 2 lbs. at best, depending on quality of the intercooler), from what the desired spring rate is, but depending on WG placement, creep may come into play & equalize that effect.

As for the boost controller, it's imperative that you have one installed BEFORE you tune, if you need to adjust boost levels accordingly, to reach a certain power level.

This will depend on the level of power you shoot for when tuned. As Shodan said, 11 psi is just that. The level of pressure that's measured at the intake manifold & MAP sensor. Your tuner will use whatever psi your setup will give him to make the power goal you choose to do.

State your power goal, it may need more than 11 psi to achieve it, which at that point, you'll need a boost controller & an aftermarket MAP sensor.

TiAL

fixed

TheShodan

iTrader: (14)

Pressure source found based upon the Vacuum source used from say an intake manifold, smarty.

TiAL

would still be wrong :p

freddysEF

thanks for the info.

I not sure what map sensor im going to run i got to talk with the tuner guy.

so should i run the WG vacuum hose to the turbo or manifold or should i get the golden eagle vacuum manifold

mechanix619

turbo to WG bottom, leave top open

Tial WG use a pressure source, not vacuum.

Silva Bullit DC4

PM mtber (John Vega) from Phearable.net & cop you an OmniPower 4 bar MAP sensor. It's a direct bolt on replacement for the stock one. Get your tuner to install it right before the tune, as your car will have to be configured for an aftermarket MAP sensor. Keep your stock one on the car until you get there.

As for the WG reference source, TiAL Sport recommends you run a pressure source to the WG, rather than a vacuum source. If your turbo compressor housing does not have a place for a reference source, you can drill & tap it (1/8 NPT). It's good to use 1/4" I.D. rubber vacuum hose.

sp00led

TIAL, what's the difference between running a pressure source versus a vacuum source for WG reference? I have a line on my WG from the intake manifold and it performs as expected.

mechanix619

Tial just recommends using a pressure source because they say using a vacuum source can damage the valve. A vacuum source will appear to work just fine but they say it can eventually damage the valve.

TiAL

that and if you develop a boost leak the turbo will still be controlled, you take the source from the manifold and you will free wheel that turbo and could possibly kill it.

most turbos do not like 200,000 RPM

mechanix619

Awesome point!!!

Schister66

There's no need to be such a douchebag about it...just answer the question, correct his spelling if you find it necessary, but leave the attitude at home. This is why people hate asking questions on this site....

TOPHERS-RACING-LOGISTICS

You do not want to put vacume to the bottom of the gate. Only boost source between the compressor and the throttle body. The valve in gate is not air tight so you will get a small vaccum leak. there is no need for vaccum on the gate only the BOV.

fusion645

Ok im a noob on a boost controller. I know it controls boost but my question is where do you hook it into????

fusion645

Can someone also send me a vids on WG i don't quite understand why you would need pressure to the WG as you guys were recently discussing. I would like to learn more about it.

mechanix619

What boost controller, manual or electrical?

mechanix619

WG's control the boost pressure.


http://www.youtube.com/watch?v=LStlqe64m4M