Boost Creep

**anpato** · 11-13-2012 06:12 PM

Im getting a catless downpipe next week along with the Torqued Performance stage 2 map. I heard that with a catless downpipe you get boost creep. I own a 2013 WRX and I was wondering if anyone knew how to stop it or control it. Thanks!

**cflip2x** · 11-13-2012 06:32 PM

Boost controller and maybe External wastgate ?

**EJ257** · 11-13-2012 06:32 PM

Some cars have it, some don't. You won't know until you install the part.

**anpato** · 11-13-2012 07:48 PM

Originally Posted by EJ257

Some cars have it, some don't. You won't know until you install the part.

Yeah someone mentioned an external waste gate, but im hoping to avoid anything too expensive.

**EJ257** · 11-13-2012 07:52 PM

Originally Posted by anpato

Yeah someone mentioned an external waste gate, but im hoping to avoid anything too expensive.

A catalyst may help prevent it (it may not). The problem is with your turbo, though. You either need to do some porting or remove the IWG (go external).

**Mf645** · 11-14-2012 04:26 AM

Your tuner should be able to keep creep under control. I have a catless DP and custom tune by STI Mikey and no issues with boost creep. Mikey said it would not be a problem, he can control it

**Calvinball** · 11-14-2012 05:23 AM

Originally Posted by Mf645

Your tuner should be able to keep creep under control. I have a catless DP and custom tune by STI Mikey and no issues with boost creep. Mikey said it would not be a problem, he can control it

You can tune to help boost creep...sort of. It's not ideal.

It's really a mechanical issue that, if it is happening, should be addressed mechanically.

**Heide264** · 11-14-2012 07:11 AM

Originally Posted by EJ257

A catalyst may help prevent it (it may not). The problem is with your turbo, though. You either need to do some porting or remove the IWG (go external).

Agreed completely.

Originally Posted by Mf645

Your tuner should be able to keep creep under control. I have a catless DP and custom tune by STI Mikey and no issues with boost creep. Mikey said it would not be a problem, he can control it

This is false. You can't control it with a tune in any way shape or form. Anybody who tells you boost creep can be corrected by a tune is pulling your leg for some extra cash.

It may be minor enough that it is still safe to run. That is not the tune controlling it - that is the mechanical properties of the system.

On top of that, your car will most likely boost spike like a boss. It'll be near impossible to get a smooth controlled boost curve, whether you realize it or not.

Originally Posted by Calvinball

You can tune to help boost creep...sort of. It's not ideal.

It's really a mechanical issue that, if it is happening, should be addressed mechanically.

The tune really does nothing with it. You just set your wgdc tables and boost control tables and try a few runs and see what happens. If the boost creep is severe, you won't be able to taper your boost down to target levels - even with zero wgdc.

The issue everybody seems to always miss is that you can't add in "negative" wgdc. There is no way to cause your wastegate to open more than fully open. If more air is directed through the turbine than you want... and the turbine still has less resistance than the wastegate... you will continue to control boost despite what your tune says. Or Johnny's tune. Or Beth's tune. It just depends on whether the majority of the air prefers to go through the turbine as opposed to the wastegate.

**anpato** · 11-14-2012 08:32 AM

Originally Posted by Heide264

Agreed completely.

This is false. You can't control it with a tune in any way shape or form. Anybody who tells you boost creep can be corrected by a tune is pulling your leg for some extra cash.

It may be minor enough that it is still safe to run. That is not the tune controlling it - that is the mechanical properties of the system.

On top of that, your car will most likely boost spike like a boss. It'll be near impossible to get a smooth controlled boost curve, whether you realize it or not.

The tune really does nothing with it. You just set your wgdc tables and boost control tables and try a few runs and see what happens. If the boost creep is severe, you won't be able to taper your boost down to target levels - even with zero wgdc.

The issue everybody seems to always miss is that you can't add in "negative" wgdc. There is no way to cause your wastegate to open more than fully open. If more air is directed through the turbine than you want... and the turbine still has less resistance than the wastegate... you will continue to control boost despite what your tune says. Or Johnny's tune. Or Beth's tune. It just depends on whether the majority of the air prefers to go through the turbine as opposed to the wastegate.

So I guess an External Wastegate is my only option?

**Heide264** · 11-14-2012 08:35 AM

Originally Posted by anpato

So I guess an External Wastegate is my only option?

Depends.

If you don't get any boost creep... No worries. If you want to avoid boost creep, get a catalyst inline there.

If it is severe, you need to increase your wastegate size. You can do this with an EWG (the route I took - gives better boost control anyhow), porting the stocker out (touchy, be careful), or getting a turbo with a more reasonably sized internal wastegate (more ponies at least)

If it isn't severe, you may not need to fix it.

**anpato** · 11-14-2012 08:39 AM

Originally Posted by Heide264

Depends.

If you don't get any boost creep... No worries. If you want to avoid boost creep, get a catalyst inline there.

If it is severe, you need to increase your wastegate size. You can do this with an EWG (the route I took - gives better boost control anyhow), porting the stocker out (touchy, be careful), or getting a turbo with a more reasonably sized internal wastegate (more ponies at least)

If it isn't severe, you may not need to fix it.

I was eventually gonna get a Blouch 20g, but due to lack of funds Im stuck with the stock turbo atleast till the summer. My only worry is blowing S*** up.

**anpato** · 11-14-2012 08:41 AM

Originally Posted by Mf645

Your tuner should be able to keep creep under control. I have a catless DP and custom tune by STI Mikey and no issues with boost creep. Mikey said it would not be a problem, he can control it

Mind sending me his user ID? I cant find him on the forum.