Will My Boost Be Creeping?

[upnorth84]

I know this subject has been getting beaten to death but I'd just like to have some piece of mind. So here's how it goes, I bought a dud of a talon and its been out of commission for a while. I got a new engine for it then found out the turbo was bad also. I know, I know, I should have inspected this car more carefully but I got it for cheap. Anyways I'm replacing the t25 with an Evo III 16g. I don't have any supporting mods as of now so I just wanted to run it at stock boost levels. The problem is, is that it has a 2.5" exhaust and doesn't have the cat on. Everything I've read on here would indicate I should have boost creep but I'd just like to make sure. If I will get boost creep would porting the turbo and installing a 34mm wasegate flapper work? Or would it just be easier to install an external gate?

 

[GST racer]

I bought a dud of a talon and its been out of commission for a while. I got a new engine for it then found out the turbo was bad also. I know, I know, I should have inspected this car more carefully but I got it for a killer deal. Anyways I'm replacing the t25 with an Evo III 16g. I don't have any supporting mods as of now so I just wanted to run it at stock boost levels. The problem is it has a 2.5" exhaust and doesn't have the cat on. Everything I've read on here would indicate yes but I'd just like to make sure. If I will get boost creep would porting the turbo and installing a 34mm wasegate flapper work?

you probably shouldnt have any boost creep with stock levels on a basically stock engine. but porting the turbo wouldnt prevent creep , did you mean porting the wastegate? if you put the bigger flapper in, you should be alright. also maybe look into getting an atmospheric wastegate dump tube, that will help a lot.

just make sure you get an autometer boost gauge and keep an eye on things.

 

[upnorth84]

but porting the turbo wouldnt prevent creep

Ya I meant the wastegate.

And I was actually planning on going with a Prosports boost gauge, I've heard their pretty decent... and cheap.

 

[1992awdlaser]

You shouldn't get creep with the 2.5 inch exhaust. I would port the wastegate passage just in case though. No need to put a 34mm flapper on it though. An external will guarantee boost control with any turbo you have and any exhaust you have so it is the best way but is not needed.

 

[ICE_T]

put the cat, back to prevent creep.

 

[upnorth84]

Thanks for the help guys.

 

[kahl23]

porting the turbo wouldnt prevent creep ,

Actually you can port the wastegate passage out a bit and that would help combat creep.

 

[GST racer]

Actually you can port the wastegate passage out a bit and that would help combat creep.

he originally said port the turbo, which is nothing to do with porting the wastegate passage. Thats why I said "do you mean port the wastegate" and he agreed, it was a mistake. no biggie

 

[bvass]

put the cat, back to prevent creep.

+1

I ported my evo316g and I have a high flow cat on my 3 inch exhaust and still get boost creep. With a 2.5 inch and a cat you should be fine. Now will be a good time to port the turbo and exhaust manifold.