wastegate

[1990talondsm]

Does anyone know of an after market wastegate for the Evo III 16g or a factory replacement.

 

[talonalex92]

Go external. Whats wrong with your wg?

 

[1990talondsm]

I'm not willing to buy a new manifold. to much and not worth the gains. Mine stays closed I am over boosting and I just bought a new Hallman boost controller.

 

[cruisintalonawd]

I know a brand new one for a 14B is like 200 from slowboyracing so you could spend the little extra and go external

 

[Mr Peepers]

What do you mean by overboosting? Does it go out of control as soon as boost hits, or slowly rise in psi as rpms go up?

Hallmans are ball and spring type so it matters which way they are routed. If boost instantly rises to an uncontrollable amount, make sure you have the MBC routed correctly and that it isn't adjusted too tight.

If boost keeps rising past the set boost level at high rpms, this is boost creep, and is very common with 16g's and a free flowing exhaust. You can port the wastegate passage using Oldman's porting methods and/or an assortment of other tricks. Going external shouldn't be necessary with a turbo as small as a 16g, unless you are having trouble holding high amounts of boost to redline. Even then, there are cheap tricks for that too.

 

[1990talondsm]

slowly rise as rpms go up 20psi.

 

[cruisintalonawd]

are you saying its going to slow for you then???

 

[1990talondsm]

I want it set at 14 psi. I don't want to have to worry about it over boosting. The boost controller was put in three days ago.

 

[1990talondsm]

It is boost creep how can I fix this. do I really need to port the turbo.

 

[cruisintalonawd]

Is it going to 20 then to 14.......what boost controller are you using

 

[1990talondsm]

I want it to be at 14 and is rising to over 20psi. I have two Evo II turbos and put my second ones wastegate on it and it is doing the same thing.but it was bent to begin with so i wasn't expecting it to work. If I went with external Id need a new manifold and waste gate. I don't have the money How can I fix boost creep without buying these things. Do you think its the turbo.

 

[iwannagofast89]

how is you boost controller set up first

 

[1990talondsm]

Its a Hallman Evolution RX Boost Controller Kit. I followed the instructions and I double checked it. It was doing the same thing before the Hallman Evolution RX Boost Controller Kit with the stock boost controller (boosting to over 20psi). the Hallman Evolution RX Boost Controller Kit has an inlet for the wastegate and a boost reference from the turbo outlet.

 

[iwannagofast89]

ok have you tried hooking the wastegate straight to a boost source so see what it did???

 

[Mr Peepers]

http://www.dsmtuners.com/forums/art...rcooler/96678-boost-spike-vs-boost-creep.html

http://www.dsmtuners.com/forums/art...oler/186525-how-cure-boost-creep-porting.html

 

[LTUDSM]

Forge Motorsport makes Adjustable Wastegate Actuators. and it goes for 165.00$ at ExtremePsi

 

[Mr Peepers]

It may be adjustable, but does that mean it has any more throw than a stock MHI actuator?

Boost creep is caused by not being able to bypass enough exhaust gas around the turbine. Putting a WGA with a stronger spring will do nothing but raise the minimum amount of boost he could run. The problem lies within the wastegate passage(turbine housing), the flapper, and the ability to get the the bypassed exhaust gases out with the least restriction possible. If that forge unit has more throw than the stock one, it will open the flapper farther(only 30* or so stock) and allow more exhuast gas to bypass the turbine if that is the bottleneck of the system.

 

[1990talondsm]

It just started doing this shortly after I put in the new motor. It was plugged into the factory boost controller and ran 8psi. Isn't an after market boost controller suppose to control the boost.

 

[iwannagofast89]

Yeah have you put that on its lowest setting to mark sure its np that

 

[Mr Peepers]

Did you happen to start running your catless 3" exhaust around the same time?

A MBC can only do so much for boost control, the problem lies within the wastegate.

 

[iwannagofast89]

If it two different waste gates then I would think it something else. Hook the waste up to the boost source and see what goes on. That would truely tell if its the waste gate

 

[1990talondsm]

I have a bigger o2 housing. Im not sure what brand it is but Im sure its not stock do to the big size of it. Peopl are saying that this would help. I have had the 3" exhaust since I bought the car. Who would you recomend sending the exhaust housing to if Im not able to do it myself or if i dont completely understand how to do it.

 

[iwannagofast89]

Have You Messed With The Boost Controller

 

[1990talondsm]

I turned it all the way down to see if I could stop it from creeping and it is doing the same thing going to 20psi. Its a brand new MBC. its a Hallman ball and spring. is it possible to buy a bigger flapper and put it on yourself.

 

[90laserRSfwd]

so what your saying is that with no boost controler connected the boost only goes to 8 psi ? (vacuum line from the outlet pipe nipple to the wastegate actuator (no boost controler)? and when you hook up the boost controler it goes up to 20 psi? or do I have this all wrong, please elaborate....