HX40 Overboosting like crazy

[Clinical]

I feel like this has to be something stupid and simple, but I'm running out of ideas and patience.

I put my HX40 setup on my car in April.
I never had an issue with my car on its 16g setup that ran consistent mid 11's on 23psi. Boost would creep from 23-26psi.
At that time I ran: evo3 16g, 2g manifold /w 38mm wastegate flange added to it, stock o2 housing, tial 2-bolt 38mm wastegate. Flapper welded shut in the hotside. Home-depot made MBC. ETS Street fmic core /w junk homemade piping. modded 1g bov.

Now I have: 7blade HX40 fresh rebuild by Justin, BEP .55ar housing, SIM tubular o2 housing /w 38mm wastegate flange open dump, Tial 38mm MVS V-band wastegate, stock 2g manifold, tial Q bov, Hallman Pro MBC. Punishment Racing FMIC kit /w piping customized for my setup. There's no wastegate flapper or anything.

When I first put the setup on the car in April, I didn't have an MBC on the car. I just ran a 17.4psi wastegate spring. The car though would go to 22psi and creep to 25psi yet felt super slow. Ended up running mid 12's @110-112mph.

I threw an MBC on it, and it'd boost to 25psi and then shoot to 30+psi.

I bought my nice hallman, took the car apart and fixed a bunch of fitment issues with my FMIC piping, modded my piping to fit my old freshly rebuilt N/T throttlebody, etc - put the car back together. Now again, with a 17psi spring in the wastegate and boost controller turned all the way down - I'll get into it and it'll go to 20psi or so and creep a bit and then suddenly shoot to 30+psi.

Now tonight I yanked the wastegate off, took it completely apart - inspected everything. Replaced all my boost vacuum line. Checked the nipple off the turbo for anything out of the ordinary. Took apart the boost controller. Took apart my bov. I changed the wastegate spring to an 8psi spring. I went out and got on it - it started at about 12psi, creeped to 20psi, by 20psi it was at 5000-5300rpm and then it'd shoot to 30psi+ again.

Thing is when it creeps and shoots up - it's not like the car is gaining power. It feels like it's just falling on its face.

I'm at a loss.
is there something stupid I'm overlooking? Here's some random engine bay pictures. Mostly still the same though now I have a nice custom 4" aluminum intake pipe to replace the FP.

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[lil corb]

Have you boost leak tested it? How is the a/f when it starts to creep? Getting richer? Could be a boost leak around injector seals or anywhere post boost gauge hook up.

 

[bastarddsm]

What happens if you take the boost controler off all together?

 

[Archer Fabrications]

You need a vac line on the wastegate, and not the top port (you have a barb on the top one that is not needed unless you run electronic controller) and make sure that the compressor nipple goes to the bottom port of your hallman , and the side port goes to the wastegate bottom port and zip tie everything.

Are you able to post a log? And or a video of it happening?
Over boosting and falling on it's face dont really go hand in hand unless you habe fueling issues.

 

[Clinical]

If I take boost controller off all together, when it was on a 17psi spring setup it would boost to 22 and ramp up to 25+psi and still feel like it had no power.
I can get a log sometime. A/F's are in the mid 12's (on e85). I have the wastegate line ran correctly, just had the extra barb in the top port in that picture. Actually one of the extra side ports blew out its plug so I had to take the barb off the top and put it on the side and put a vacuum cap over it. I have the line ran to a different barb on the side.

It's not so much that it hits a brick wall or anything, and the car doesn't lean out. It just feels like it's seeing 10psi+ at best when its overboosting at 25-30+.
I'll try to grab a video of it.

 

[Archer Fabrications]

What fuel pump are you using? And are you 10,000% sure that barb that blew out and is now capped is actually sealed? That would do it right there, and you didn't me tion anything about it initially, anything else you wanna share? Lol

I dunno if you know hownthe mbc controls boost but basically it has a bleader hole to let air out so it doesnt let the gate open until more pressure is reached, if your blown out barb is leaking AT ALL you will boost more than what you want. I had a ziptie on my old setup melt and popped off the gate boost line and i was seeing 44 psi and was wondering why i didn't hear the gate open... At all .

 

[1990TSIAWDTALON]

BLT that thing.

 

[Canadian_CD9A]

Just curious, how and where are you measuring boost?

 

[bastarddsm]

It sounds like your gate is sticking. Take it off and use compressed air to open it. Should take 20-30psi to open it since you don't have exhaust pressure helping.

 

[babyviper]

your wastegate is not properly setup. Hook it up like this and make sure your are not confusing vacuum ports with coolant ports. The MVS gate ports are labeled.

http://www.tialsport.com/documents/MV-Install-Guide.jpg

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[Archer Fabrications]

Fyi you can't confuse the vac ports for the coolant ports because they are different sizes and the barb doesnt fit on the coolant port, nor does the coolant port come with a block off.

He has a leaking barb because one of the air ports stripped out he said, this would cause over boost due to the similr effects of a bleeder valve.

 

[bastarddsm]

I don't think it's a leaking barb. It would do the opposite of what he has, spike and fall. He's got a severe creep problem.

 

[Archer Fabrications]

He says he has two barbs on one wastegate, one barb is stripped with a vac cap, and the other goes to the boost controller, if it leaks enough.....

 

[babyviper]

The MVS is supposed to come with three plugs, did you lose them? why did you use a hose plug instead of the threaded block-off plug?