Can't turn boost down

[jdm9221]

I have a 97 eclipse GSX 16g,550cc injectors,walbro 255,hallman mbc, and a few other bolt ons. So I have the boost controller between the j pipe and and wastegate(yes it's hooked up right,and I've tried both ways). Before I was only hitting 13psi because it was leaking from my bov, replaced that(recirculated to the intake) and now it's hitting 26psi with the boost controller turned all the way down. Also on a side note I've been trying to set a base tune using my safc2 and my wideband. Hi throttle points are set -37 all the way across and it's still running 9.6 under boost, does this seem right to keep going lower considering they're only 550s and the safc maxes to -50? Any help is appreciated

 

[doubleclutch]

You don't mention any exhaust mods in your profile, so I doubt it's boost creep. 16gs are notorious for creep on a 3" catless exhaust, the usual fix being porting as gofer mentioned and/or a tubular O2 housing (02 dumps rarely help). I'm betting on the WG.
You definitely have something going on with your safc as 550s in a 2g should require very little adjustment. Make sure you don't have any boost leaks as they will make you run rich. You may want to invest in a afpr as some people have problems with a 255 over running the stock fpr.
http://www.roadraceengineering.com/newafc.htm

I mean...

It's a non port 16 and a thermal exhaust. Even at 26 there's no boost creep

Probably boost creep.

 

[jdm9221]

It's a 3 inch thermal exhaust

 

[livedsm4g63]

Does anyone read? He took off his mbc and its still running 26psi.
Not to mention, boost creep is gradual. Its not instantaneously. (Hence the creep)

As mentioned, unhook your wastegate cotter pin that is attached to the flapper and go make a run. You should make little to no boost. If this is the case, your wastegate is at fault.

 

[Vegas Smith]

The car is such a beast that it doesn't even bother with baby boost.

 

[PlanZero]

Jesus I don't know how I missed the exhaust. I assume no cat right? Meh, throw a couple washers behind the WG mounting bolts so it snaps shut better.

 

[livedsm4g63]

The car is such a beast that it doesn't even bother with baby boost.

Haha, its calling to its owner...booooost me.....I only have 7.8:1 compression....booooossttt meeeeee.

Jesus I don't know how I missed the exhaust. I assume no cat right? Meh, throw a couple washers behind the WG mounting bolts so it snaps shut better.

Typically the seals dry out in the wastegate, thus not allowing vacuum to move the actuator.

 

[jdm9221]

You don't mention any exhaust mods in your profile, so I doubt it's boost creep. 16gs are notorious for creep on a 3" catless exhaust, the usual fix being porting as gofer mentioned and/or a tubular O2 housing (02 dumps rarely help). I'm betting on the WG.
You definitely have something going on with your safc as 550s in a 2g should require very little adjustment. Make sure you don't have any boost leaks as they will make you run rich. You may want to invest in a afpr as some people have problems with a 255 over running the stock fpr.
http://www.roadraceengineering.com/newafc.htm

It is a 3" catless thermal exhaust

 

[jdm9221]

I'm gonna unhook the wastegate today and see if it makes boost. What are my solutions if it does or doesn't still make boost

 

[livedsm4g63]

If it still makes 26psi your flapper is seized. If it makes near none, theres something wrong with the wastegate. Chances are, its the wastegate.

 

[jdm9221]

Time for a New turbo or is there a fix to that?

 

[doubleclutch]

Yeah, you buy a new wastegate actuator.

Was that the problem?

 

[Vegas Smith]

You would just put on a working wastegate and that would take 5 minutes.

 

[jdm9221]

Haven't tried it yet. I get out of school at 2 and I'll try it then. Where could I pick up just the wastegate?

 

[livedsm4g63]

Post a wtb ad in the correct section of this forum? Nobody like holding peoples hands.
www.google.com

 

[doubleclutch]

Can we all agree to not post any more help until this guy disconnects the flapper arm and makes a pull? This is getting ridiculous.

 

[93AWDDSM]

Lol.