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Old 11-04-2003, 12:29 AM   #26
300blueballs
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Quote:
Originally posted by Davenow
My VF24 was creeping from 15 to 18.8PSI.
I ported the wastegate , same deal, more towards the flapper pivit, also severly rounded the passage into the wastegate.
No more boost creep! Although I did have to raise the boost numbers in my utec (which were VERY low anyway) to get the same boost.
Why did you have to raise the boost numbers after porting the wastegate? Doesn't the ECU monitor boost? For example if you had it set for 15lbs shouldn't it hit 15 lbs no matter how much the wastegate was ported (unless you ground it out more than the flapper diameter)?

I guess I am asking if the flap gradually and actively changes its position depending on the boost level (which should on the current wastegate actuator map - depending purely on the boost level and adjusting it to make it match the boost level specified in the programming throughout the RPM range) aka, does the ECU adjust the wastegate according to the new dimensions of the hole by the amt. of boost it sees.

Or is it alot simpler and it's more like if experiencing X amount of boost, open the wastegate by X amount....

(just want to make sure I will not be boosting lower than stock levels if I port mine)
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Last edited by 300blueballs; 11-04-2003 at 11:11 AM.
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Old 02-20-2004, 12:35 AM   #27
Kenneth2000
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Damn ... I wish I had seen this before I installed my turbo ...

Oh well ....

I guess I'll have to wait now ....
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Old 02-21-2004, 11:12 PM   #28
300blueballs
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I've had mine ported by the STi mechanic at my dealership who does aftermarket installs on the side. Boost creep is gone. I'm getting 15psi solid which is what I had stock so I am extremely happy.

He is doing this for a guy from out of state so I'll try to take some pictures then.
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Old 04-14-2004, 04:14 PM   #29
Pirana
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blueballs any updates
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Old 04-14-2004, 04:42 PM   #30
300blueballs
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Check this out Pirana:

http://www.imprezawrxsti.com/postnuk...ewtopic&t=8186

My boost levels are 100% fine after the port.

Anything else you need to know, I'll be happy to help.
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Old 04-15-2004, 07:32 PM   #31
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nice.
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Old 04-29-2004, 05:07 PM   #32
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Quote:
Originally posted by 300blueballs
Why did you have to raise the boost numbers after porting the wastegate? Doesn't the ECU monitor boost? For example if you had it set for 15lbs shouldn't it hit 15 lbs no matter how much the wastegate was ported (unless you ground it out more than the flapper diameter)?
The reason Davenow had to raise his boost levels if pretty simple. First and foremost he was/is using Utec to control boost. With the Utec you don't give it a boost level (i.e. 18psi) you give it a number that changes wastegate duty cycles and a couple other things. Also since the air can move through the wastegate so much easier now it now takes that path as the path of least resistance. By raising your boost values you raise your wastegate duty cycle which keeps the wastegate flapper closed more. If your stock ECU controls boost (stock or reflashed) it should be able to adjust to the increased flow through the wastegate. However there is a limit to how much it can adjust so quite possibly on very hot days you might not beable to hit full boost. I would remove just enough material to make it so that the boost doesn't creep and that is all. Unless of course you have a way to control boost (EBC, Utec, ECUtek).

I hope that wasn't too confusing. Damn did I say wastegate alot.
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Old 04-29-2004, 07:52 PM   #33
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Update:

Did my porting myself last week and happy to report that I'am back to full throttle and no boost creep. Steady at 15psi, which was the same I had before the intake and exhaust.
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Old 05-02-2004, 10:19 AM   #34
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K, so i am putting on a Helix DP and a HKS carbon Ti cat back exhaust on my STi later today. From what I am reading and correct me if I am wrong, in "theory" I will get boost creep correct?
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Old 05-02-2004, 12:18 PM   #35
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^Yes you will.

A buddy of mine and I just ported the wastegate on his sti to relive bc with a helix/blitz combo. We were able to remove the exhaust housing from the center section without removing the entire turbo from the car. Basicly we left the water lines on and were carefull not to doink the turbine blades when we seperated the ex-housing. Its really not that hard. The creep was gone after the port. Boost was good.
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Old 05-03-2004, 04:28 AM   #36
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i cant beleive this thread is stil around.. whoa!
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Old 07-15-2004, 04:16 PM   #37
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Great info ... after putting on my ScoobySport DP ... I'm getting creep ... this should take care of it.
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Old 08-31-2004, 06:02 PM   #38
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what about an external wastegate? anyone done this yet?
Greg
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Old 08-31-2004, 06:06 PM   #39
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I found the my Shiv dyno tuned EcuTek engine has a little bleed hole tube in the wastegate line ... when I taped over it ... I ended up with stock like boost. By carefully taping over half of the (-0.5 mm) hole ... I stopped getting boost creep ... while maintaining my proper 17 psi boost in high boost mode ... until I was able to get my ECU re-flashed from Vishnu/Shiv with the proper map that took my downpipe into consideration.
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Old 02-07-2006, 05:34 PM   #40
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Subaru Banner Help

HI
I am new in nasoic althought I have read a lot of information posteed.

I have a 06 wrx I installed a hks down pipe and up pipe and greaddy full 3'' cat back, perrin air intake. I was having turbo creep and a friend of mine that has a machine shop and I did the porting in the waste gate I removed 0.177" of material in the waste gate when I reinstalled my turbo I installed a perrin boost controller and the intercoller house kit, everything was find until today that I decided to remove the boost crotroller because (I wasn't happy with it) I was not boosting more that 13 psi (before the porting and boost controller instalation I was boosting 18 psi) so I run it to try and I got boost creep ( fuel cut and engine light and cruise control light went off on the dash) The car with out the boost controller run much better I was boosting close to 17 psi when I hit fuel cut.

The question is has somebody had the same problem before or I need to do some more porting to the waste gate.

Thanks to the pictures and Information provided by austin I did it but I don't know what to do next....
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Old 02-07-2006, 05:47 PM   #41
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Quote:
Originally Posted by 06subiwrx
when I reinstalled my turbo I installed a perrin boost controller and the intercoller house kit, everything was find until today that I decided to remove the boost crotroller because I was not boosting more that 13 psi (before the porting and boost controller instalation I was boosting 18 psi) so I run it to try and I got boost creep

If you're not overboosting with a boost controller hooked up, you don't need more porting.

If you're not overboosting with a boost controller hooked up and then you do overboost when you remove the boost controller, your vacuum lines are wrong and/or restricted. You're somehow venting air from the boost control lines, which lowers the pressure exerted on the wastegate actuator, which keeps the wastegate shut longer (or, shut to a greater pressure), which causes your turbo to spin faster & create more boost pressure.

If you run a straight (meaning no other connections) vacuum line from the turbo outlet (highest pressure source) to the wastegate actuator, your boost pressure should max out at wastegate spring pressure. If your boost creeps up above wastegate spring pressure, you have boost creep. If your boost creeps up to a level higher than you want, you need more porting.

With your perrin controller removed, what are you running for boost control?
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Old 02-07-2006, 08:12 PM   #42
06subiwrx
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Subaru Banner boost creep

I just reconected the stock "boost controller" (the stock conection turbo to wastegate) the stock lines and I am geting the boost creep. What I don't understand is why after instaling the perrin boost controller my boost levels went down, and know that I reconected the stock lines and my boost increased by a 25 to 30 % per gear (it feels like a diferent car) just know I reconected the perrin boost controler and again no boost creep but boost levels low.

Is there a problem with the boost controller or I did not conected it right but I gonna try I direct line from the turbo to the wastegate. If I do so it is better that the MBC or should I reinstal it the MBC. What do I do with the stock holes I mean when I install the boost controller what happend with the stock lines.

Thanks
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Old 02-07-2006, 11:04 PM   #43
06subiwrx
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At the Track boost

I connect the turbo to the wastegate without any boost controler and the car is running better that the MBC so I would like to know if I am going to have any problem

thanks
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Old 08-30-2006, 01:24 PM   #44
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Thread revival...

Are there any other benefits to this porting? Does it spool more quickly? I've read somewhere to port some part of the VF39 to get it to spool more quickly, but I can't find the thread.

Also, what type of grinder bit is needed to grind away the metal?

Thanks,
Greg
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Old 11-02-2006, 05:50 PM   #45
Greg555
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I aslo have a question.

Is boost creep a problem if you are running higher boost levels? (reflashed ECU?)
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Old 12-31-2007, 05:04 AM   #46
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very very informative
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Old 02-23-2008, 11:38 AM   #47
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Blueballs, that link is dead.

I am putting on a Perrin divorced wastegate DP today. What kind of tool does one use to accomplish this task. My buddy has a garage full of em.
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Old 03-21-2008, 10:05 PM   #48
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noticed some boost creep lately

2005 wrx stage 2, with catless uppipe and Cobb downpipe w cat.
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Old 03-21-2008, 10:08 PM   #49
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tools ... first put penetrating oil/spray on the nuts
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Old 12-25-2008, 10:06 PM   #50
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Just installed a Helix catless dp and got this ****ing boost creep. How hard is it to port? Is there a list of tools that i need? Want to buy a used VF 39 exhaust housing
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