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Old 04-28-2009, 01:36 AM   #51
clean 93
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Good job. Going to port my td05 soon.
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Old 11-12-2009, 07:53 PM   #52
mysuby
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everything i'm reading has been about the 2.5L, well my o3 wrx 2.0L i believe has boost creep. i just installed a tbe and now my boost climbs up to .12 bar (i believe thats almost 18psi) in 5th gear by like 5000rpms.. i've been reading about porting the waste gate opening,..but will this help my 2.0? also the pics that were in that thread..no longer are there or will open. i need to fix this prob asap..any help would be wonderful thanks so much.
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Old 11-12-2009, 07:55 PM   #53
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oh and i have a turbo xs mbc ...and still stock turbo with EM if that helps anyone, i'm pull my turbo off this weekend, cause i'm doin a header and catless up pipe,...so i figure while its off or almost off i should address this issue but not sure the best way thanks again in advance
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Old 11-12-2009, 08:17 PM   #54
quazimoto
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You do not get boost creep on a 2.0L.................boost spike and boost creep are two different things.
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Old 11-12-2009, 08:28 PM   #55
Chi_San
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Boost creep is caused by a wastegate that is too small for the boost (volume of exhaust gas) you are running, period.

You can get boost creep on a TD04, you can get it on a TD06, you can get it on a VVT.

The easiest way to get rid of it is to get a hybrid controller and control your boost more precisely in all gears, or to get an EWG that is large enough and can flow enough gas to keep your boost from getting out of hand.

Going to have to deal with this on my car soon. Gah.
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Old 11-12-2009, 08:39 PM   #56
bajozzy
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nevermind....
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Old 11-12-2009, 08:40 PM   #57
mysuby
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i understand the difference between spike and creep, i have creep..it slowly rises as rpms rise..doesnt drop.

i dont really have any money to throw at this problem right now, and i will have the turbo off this weekend....so like was sayin...is this porting of the wastegate hole a good fix too? will it work on mine? i also read a little bit somewhere about lengthening the wastegate arm...? any idea on if that would work as well.? should i do both or one or the other?
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Old 11-12-2009, 08:40 PM   #58
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Quote:
Originally Posted by dumdum View Post
You do not get boost creep on a 2.0L.
False. You certainly may get boost creep on a 2L engine.




Quote:
Originally Posted by Chi_San View Post
The easiest way to get rid of it is to get a hybrid controller and control your boost more precisely in all gears ...
False.

If your boost controller functions by controlling the wastegate (which it does), then changing controllers will do nothing for you.

If your wastegate is 100% open with type A controller (meaning type A controller is acting to spin your snail as slow as possible), then why would you expect different results by changing just the controller? Type B controller will also open the wastegate 100% - but the amount of exhaust flow bypassing the turbine wheel will be the same, because you have the same wastegate and the same flow dynamics.
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Old 11-12-2009, 09:06 PM   #59
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Quote:
Originally Posted by Austin View Post
False. You certainly may get boost creep on a 2L engine.






False.

If your boost controller functions by controlling the wastegate (which it does), then changing controllers will do nothing for you.

If your wastegate is 100% open with type A controller (meaning type A controller is acting to spin your snail as slow as possible), then why would you expect different results by changing just the controller? Type B controller will also open the wastegate 100% - but the amount of exhaust flow bypassing the turbine wheel will be the same, because you have the same wastegate and the same flow dynamics.
You fail to comprehend my point.

My point was to get something that can be tuned by gear for boost.

Also, if you get boost creep at 22 PSI, but you don't at 20 PSI or less, then you would want to set the boost to 20 PSI (or, if you're smart, 19 PSI for some buffer). If your MBC cannot physically let you set it to 20 PSI, it's either 22 or 14, then what's the point of the MBC?

Edit: Also, if you're using an EBC, and you overboost, you can get into that annoying overboost range. Having a hybrid setup probably would be a good idea then, at least from the Propaganda that I've seen, as they tend not to be so 'boost spike' happy (can you even overboost due to a boost spike?)
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Old 11-12-2009, 09:08 PM   #60
mysuby
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please... can anyone tell me an easy fix for this..... porting the wastegate hole? lenghten the wastegate arm? once again thanks all for the replies? and why the " nevermind"?
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Old 11-12-2009, 09:11 PM   #61
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Quote:
Originally Posted by mysuby View Post
please... can anyone tell me an easy fix for this..... porting the wastegate hole? lenghten the wastegate arm? once again thanks all for the replies? and why the " nevermind"?
Depends on your setup.

Big turbo? Big power? Don't mind a little more noise? Got a little money? Buy an EWG kit and forget the waste gate in the turbo. Don't forget to get tuned.

No money? Simple, turn down the boost.
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Old 11-12-2009, 09:20 PM   #62
mysuby
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money is pretty tight right now...that why i was asking about the fixes i had mentioned. i dont really have the boost turned up, just a tad over factory,

i have the stock turbo, and no i dont mind noise,, and my next mod i'm planning is a cobb ap just gotta save up some doe

does anyone have any experience with either of the fixes i've mentioned? or that is mentioned at the very begining of this thread
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Old 11-12-2009, 09:24 PM   #63
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Quote:
Originally Posted by mysuby View Post
does anyone have any experience with either of the fixes i've mentioned? or that is mentioned at the very begining of this thread
You should probably contact whomever posted at the beginning of this thread...
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Old 11-13-2009, 05:59 PM   #64
mplspilot
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Quote:
Originally Posted by mysuby View Post
everything i'm reading has been about the 2.5L, well my o3 wrx 2.0L i believe has boost creep. i just installed a tbe and now my boost climbs up to .12 bar (i believe thats almost 18psi) in 5th gear by like 5000rpms.. i've been reading about porting the waste gate opening,..but will this help my 2.0? also the pics that were in that thread..no longer are there or will open. i need to fix this prob asap..any help would be wonderful thanks so much.
3 ways to fix this:
better WG duty boost control throughout rpm
running higher boost
porting that internal wastegate divider hole
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Old 08-22-2013, 04:22 AM   #65
jaydnisevil
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Would be great if somebody could re-upload the images for this..
I've got an STi 2.0 with the VF35 and it's a creepin :P
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