boost creep/me being an idiot? help lol

[1990talontsi]

i recently purchase a hx40 and im having problems holding steady boost i seem to have a problem with boost creep or something
in first gear it goes to 15 pounds
second gear it goes to 15 then rises to around 20 closer to redline
3rd gear it goes to 20 then raises to 30
and 4th gear it goes to around 20 then goes to like 34 pounds

i have a 2.4 motor with a tial 38mm wastegate off the o2 housing

i have my boost controller setup and when it was off the car it would go to 15 and then seem to creep to 20-25
i cant figure out whats going on
do you have any ideas i have boost leak tested it and checked all my lines and i can hear my wastegate opening around 15 pounds but then closer to redline the boost just keeps increasing
any ideas ?

 

[canada4g63]

what kinda of booster controller are you running. When i had a shitty turboxs it did the same thing. Also i had a friend with a cheap home made one on his gti and his got stock at 30psi and sent a piston right thru the block.

 

[1990talontsi]

Im running a hallman pen style type.

 

[gofer]

Try "hogging" out the wastegate passage in the turbine housing, sometimes Holset users run into boost creep problems because of the abrupt turn to the wastegate.

You'll really want to concentrate on opening up this portion of the housing, making it easier for the exhaust gases to make the turn out of the wastegate passage, rather than over the turbine wheel and creeping.

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Once you're done it should look similar to this...

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[1990talontsi]

Its running a used bep manifold and the person before me never had any problems and he was running 25 psi. would like to see if theres any other thing going on before i rip the turbo off again if at all possible

 

[gofer]

Was the previous owner of your Holset setup also running a 2.4l engine? Your 2.4 pushes a lot more exhaust out and over the turbo than a typical 2.0 engine, something to keep in mind when comparing setups.

Basically all you can really check are your vacuum lines and maybe change where the wastegate/boost controller get their boost source from, if its correct or not. Where do your wastegate/mbc lines route from and is anything T'd into them? How do you have the top port of the Tial WG setup, open to atmosphere, plugged, or a vacuum source going to it as well?

 

[1990talontsi]

my wastegate is connected from the bottom to my boost controller and my boost controller is connected to the nipple on my turbo
the top port of the wastegate has nothing in it so i guess its to atmosphere

 

[gofer]

Your vacuum lines are ran correctly, your wastegate holds boost at 15psi (with the mbc out of the equation) and it still creeps to 25psi by redline. Guess what comes next?

I hate to say it but you either install a restriction in exhaust system (smaller dp, catalytic converter, catback) or you pull the back housing and port it. Sorry man, I've been in the war against boost creep before too and its no fun.

Out of curiosity, are you running E85 on this setup?

 

[1990talontsi]

DAMN
yes im running full e85
maybe its stopping at 15 because my boost controller is set to 15 and then its creeping up past that
if i set my boost to 30 i wonder if it will cure my boost creep or do you think it would creep even higher than before?
i have a built bottom end so 30 psi should be handled fine and i always heard in order to fix creep set the boost that its creeping to

 

[gofer]

Without the mbc installed (just a line from the nipple on the compressor housing straight to the wastegate) you'll be running the spring pressure of the Tial. A local DSMer always tells people "boost creep is your turbo's way of calling you a ####y," which in a way holds true. However, you won't want to run that much boost on pump gas or else you're just asking for trouble.

I recommend taking off that back housing and doing the port work.

 

[JusMX141]

Just run 30psi and leave the housing alone.

I think the reason you're reporting a problem that others don't seem to have is because nobody buys a HX40 to run 15psi.

 

[1990talontsi]

yes you are probably right but i like to be a baby on things before i go balls to the wall

hopefully i can turn the boost controller up and hit 30 psi and not creep anymore

i think thats why i was hitting 15 and then it would creep up more because thats where my boost controller is sat at
i turned it in 4 turns from being all the way out so its probably zero pressure on that line