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Old 06-30-2004, 04:08 PM   #1
SloRice
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Default Port, Polish and Clipped VF39?

I know this has been covered but I'm gonna ask again.

I'm thinking about getting the stock VF39 compressor housing, and exhaust housing P&P'd and a bigger flapper for the wastegate. They are going to charge me $100. Does this sound like a good deal?

Obviously, I'm going to get rid of the boost creep with the new flapper but with the P&P, will that give me more power too (preferably top end)?

I'm also wondering if anyone has ever got the stocker clipped? If so, what kind of affect did it have on lag? And top end power? I do a lot of auto-xing, so I want minimal lag, but you all know what happens when a punk pulls up next to you on the highway....

Any info would be appreciated.

thanks.
Tim
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Old 06-30-2004, 04:47 PM   #2
V6TurboTA
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Quote:
Originally posted by SloRice

Obviously, I'm going to get rid of the boost creep with the new flapper ...


Tim
This is an incorrect assumption.

~v6
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Old 06-30-2004, 04:53 PM   #3
SloRice
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ok, let me restate it: I'm am going to get rid of the boost creep with the larger diameter wastegate hole and larger flapper to seal up with said hole.

you're a smart guy and i agree with a lot of what you say, but lets stay on topic and not hash out my grammar
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Old 06-30-2004, 04:59 PM   #4
V6TurboTA
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Quote:
Originally posted by SloRice
ok, let me restate it: I'm am going to get rid of the boost creep with the larger diameter wastegate hole and larger flapper to seal up with said hole.

you're a smart guy and i agree with a lot of what you say, but lets stay on topic and not hash out my grammar
Que pasta?

Porting the wastegate will not nessacarily fix your boost creep problem.

All I was saying.

~v6
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Old 06-30-2004, 05:47 PM   #5
carguy19
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Its a waste. The turbo is too small for the STI.
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Old 06-30-2004, 05:49 PM   #6
V6TurboTA
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Too small

Did you miss where he said Auto-x? He wants the smallest turbo possible imho.

~v6
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Old 06-30-2004, 07:06 PM   #7
SloRice
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why will porting the wastegate not always solve the problem? I thought it did?

My main desire in this whole matter is to get rid of boost creep. If I do the port and polish while I'm at it and get a little more top end, more power to me I guess.
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Old 06-30-2004, 08:20 PM   #8
STiLL WILL
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Quote:
Originally posted by V6TurboTA
Que pasta?

Porting the wastegate will not nessacarily fix your boost creep problem.

All I was saying.

~v6

I can only speak for myself, but my Deadbolted VF34(Monster PnP, BlackHole wastegate flapper) cured my creeping and spiking problem on my STi. Boost is solid at 1bar in gears 1-4 and it just flirts with 1.1bar in 5th gear WOT while tapering down to .9 bar. Before it was sent to Deadbolt, I it pegged to 1.35 bar in 5th and I hit fuel cut.


-Matt
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Old 07-01-2004, 12:28 AM   #9
StatiK
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porting my own stock vf39 cured my creeping prob also
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Old 07-01-2004, 12:52 AM   #10
V6TurboTA
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I would say from my asking around about 1 out of 10 people that get a P&P still had boost creep.

Some people get a P&P before ever even driving the car modded so when they say "I dont have any boost creep" thats fine and good, but they might not have had any in the first place. I know of multiple people with turbo backs on STi's that dont have any creep at all. That doesnt mean you can say "I got it ported and it solved the problem" If you never experienced the problem, how can you say you fixed it?

That is why I shake my head at people that say stuff like "Im getting a VF 34, and having it ported to solve the boost creep problem" before they even get the parts in hand.

1, you dont know if you will have boost creep
2, you dont know that porting the wastegate will ultimately fix it.

This is not directed to the original poster, just my thoughts in general.

And as a final thought. Porting the wastegate can solve the problem, but is not a "sure thing".
Also the porting done can fix the boost creep, and on the same note it can cause other issues.

~v6
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Old 07-01-2004, 02:27 AM   #11
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Quote:
Also the porting done can fix the boost creep, and on the same note it can cause other issues.
What are the other issues?
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Old 07-01-2004, 03:01 AM   #12
V6TurboTA
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If its not done correctly the wastegate might not close correctly, or may have leaks around the flapper. This is not good.

If you pay a pro to do it, I wouldnt think that would be a problem at all.

I have heard of other storys, but they were just that, storys. I still think its safe to say you can run into other problems tho.

The whole P & P can do great things, or it can horribly effect the turbo. All depends on the knowledge and skill of the person doing the job.

I wouldnt send my turbo to anyone with less that 5+ years experience anyways. The turbo is one of the only parts on my car I refuse to modify myself. Mainly because I know better from exp. Its not a piece of the exhaust like a muffler, its a very high precision piece.

~v6

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Old 07-01-2004, 08:33 AM   #13
SloRice
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I agree with you completely. The turbo is definately not something you want to screw around with. I'm probably going to be taking my turbo to Buschur Racing for the port and polish. I know they aren't extremely big into Subaru's, but they know turbos and turbo cars.

Couple questions I would like to get answers for still:
- What will porting the exhaust and compressor side do for me power-wise?
- Has anyone ever clipped the stock turbo? Does it add good top end without sacrificing lag?

thanks,
Tim
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