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Old 04-30-2004, 05:10 PM   #1
GirlsRFast2
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Default How to port and polish vf39

I took my turbo off with plans to p&p and I cant find any instructions or a how too. I did a search and cant find anything any help would be appreciated

Thanks Cole
(Crap Im in my girlfriends account)
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Last edited by GirlsRFast2; 04-30-2004 at 08:01 PM.
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Old 05-01-2004, 05:12 AM   #2
nhluhr
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what do you want to port? Do you want to do a performance port or just the wastegate to prevent boost creep?
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Old 05-01-2004, 11:43 AM   #3
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this is a sticky at the top of the page:

http://forums.nasioc.com/forums/show...hreadid=477715
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Old 05-01-2004, 03:04 PM   #4
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Default Re: How to port and polish vf39

Quote:
Originally posted by GirlsRFast2
I took my turbo off with plans to p&p and I cant find any instructions or a how too. I did a search and cant find anything any help would be appreciated

Thanks Cole
(Crap Im in my girlfriends account)

I also did a search and read all the previous posts on boost creep and porting. I'm still not very convinced I can do it myself without screwing something up.

My biggest fear is I will screw up my turbo. That would suck worst than my mild boost creep.
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Old 05-02-2004, 05:57 PM   #5
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Be careful, it only takes a little slip to cause problems. We have had to fix several within the past few weeks that were done incorrectly.
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Old 05-03-2004, 08:50 AM   #6
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Deadblot what was it tha you had to fix about incorrectly ported turbos wastegate stuff or from performance porting?
what are some of the issues i just ported my wastegate yesterday i hope there wasn't a bunch of stuff that could have gone wrong
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Old 05-03-2004, 12:40 PM   #7
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Quote:
Originally posted by DeadBolt Enterprises
Be careful, it only takes a little slip to cause problems. We have had to fix several within the past few weeks that were done incorrectly.
Not really. The only to keep in mind is to not go over any sealing surfaces.
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Old 05-05-2004, 04:06 AM   #8
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Hey its not that hard. If you stay away from any sealing surfaces and make sure the flapper has enough margin to form a seal you'll be fine. I ported mine to stop boost spikes and creeps and it worked fabulously. If you have a dremel, get a carbide cutting bit and it will go pretty fast. They are numbered 9000 and up.

I pulled the whole turbo, it was much easier than messing with the uppipe! Took about an hour to remove the turbo and I was taking my time.

After porting the wastegate, the turbo pulls hard without spiking or creeping, just hits the target boost and stays. In fact it flowed so well that I had to modify the inline restrictor supplied by Vishnu to get to target boost as the wastegate was getting pushed open too easily after porting.

Before this mod, using ecutek, I had to lower my target boost and boost duty cycles to keep from spiking and overboosting. Now I can set at normal 100% for the map and its perfect.
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Old 05-05-2004, 07:34 AM   #9
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Porting a wastegate is usually easy for most people, and common sense will tell you to stay away from the sealing surfces, however all the ones we have had to repair were either ported too far, past the edge of the flapper, or had the clean edge of the flapper scarred up badly. A very light mark on the wastegate such as with sandpaper will not be a problem, however, using quick cutting tools like carbide cutters leave you far less room for error, one slip and you can make a deep gouge.
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Old 05-05-2004, 07:42 AM   #10
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Quote:
Originally posted by DeadBolt Enterprises
Porting a wastegate is usually easy for most people, and common sense will tell you to stay away from the sealing surfces, however all the ones we have had to repair were either ported too far, past the edge of the flapper, or had the clean edge of the flapper scarred up badly. A very light mark on the wastegate such as with sandpaper will not be a problem, however, using quick cutting tools like carbide cutters leave you far less room for error, one slip and you can make a deep gouge.

But carbide is so much faster than stones. Rough it out with the carbide and do finish work with stones and flapper wheels.

TMS
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Old 05-05-2004, 10:57 AM   #11
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-- Kinda off topic question --

Is it legal in AutoX classes to p-n-p the wastegate to prevent boost creep? I can't imagine that it is...

- Miranda
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Old 05-05-2004, 11:02 AM   #12
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I'm pretty sure it is. Besides they can't take your turbo off at inspection to check. There is nothing in the rule book that say you can't port your wastegate for boostcreep.

Andrew
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Old 05-05-2004, 12:12 PM   #13
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how do you know if the individual has gone too far? I'm getting a port this weekend, and want to make sure I'm aware of any screw up ASAP. what should I be on the lookout for?
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Old 05-05-2004, 03:32 PM   #14
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Quote:
Originally posted by Qbushido
how do you know if the individual has gone too far? I'm getting a port this weekend, and want to make sure I'm aware of any screw up ASAP. what should I be on the lookout for?
Just curious, where you getting your turbo ported?
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Old 05-05-2004, 03:40 PM   #15
Qbushido
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out in LI, pm me for more info.
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Old 05-05-2004, 06:45 PM   #16
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Quote:
Originally posted by Midnight_Gold
-- Kinda off topic question --

Is it legal in AutoX classes to p-n-p the wastegate to prevent boost creep? I can't imagine that it is...

- Miranda
Only in prepared or mod. Any modification to the turbo is illegal in Stock, Street Touring, and Street prepared. Silly rule but true.
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Old 05-06-2004, 04:36 AM   #17
nhluhr
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Quote:
Originally posted by TheMadScientist
But carbide is so much faster than stones. Rough it out with the carbide and do finish work with stones and flapper wheels.

TMS
how much faster does it need to be?

Using my air grinder, the past three wastegates I ported took a whopping ~20 minutes each.

That's using the tapered stone to rough the hole open, using the medium flapper wheel to smooth the roundness, and the abrasive sponge bit to polish it shiny. - and i didn't just enlarge the hole but i also improve the passage getting to the hole.

Carbide bits on a dremel are a severely bad idea for porting large objects like turbos... They remove material in sharp cuts instead of smooth arcs. Porting is properly done with a stone and a grinder, NOT a dremel.

Don't get me wrong - i'm not hating on dremels - i use my dremel probably more than the average car guy.... but it has it limits. Using a dremel for porting turbos is like using a felt-tip pen to paint a wall.

Last edited by nhluhr; 05-06-2004 at 04:42 AM.
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Old 05-06-2004, 04:39 AM   #18
nhluhr
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Quote:
Originally posted by deadbolt
Only in prepared or mod. Any modification to the turbo is illegal in Stock, Street Touring, and Street prepared. Silly rule but true.
yep it's not about what the rulebook Doesn't say is prohibited. It's about what the rulebook Does say is allowed. And for STU it does not allow turbo work so you don't get to go there.
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Old 05-06-2004, 08:02 AM   #19
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Quote:
Originally posted by nhluhr
how much faster does it need to be?

Using my air grinder, the past three wastegates I ported took a whopping ~20 minutes each.

That's using the tapered stone to rough the hole open, using the medium flapper wheel to smooth the roundness, and the abrasive sponge bit to polish it shiny. - and i didn't just enlarge the hole but i also improve the passage getting to the hole.

Carbide bits on a dremel are a severely bad idea for porting large objects like turbos... They remove material in sharp cuts instead of smooth arcs. Porting is properly done with a stone and a grinder, NOT a dremel.

Don't get me wrong - i'm not hating on dremels - i use my dremel probably more than the average car guy.... but it has it limits. Using a dremel for porting turbos is like using a felt-tip pen to paint a wall.

I am not just porting the wastegate. I am gasket matching and polishing. I use a die grinder with carbide bits for as much as I can reach. Then switch to a flex shaft tool for the work further down inside the turbine inlet. After the carbide bits I switch over to the stones and do it all again to get rid of the marks left by the carbide bits. Then I got to sanding drums and then to flapper wheels and then to scotch bright pads.
The carbide bits make the initial cutting and shaping go so much faster than stones alone. Also the carbide dose not wear as fast as the stones.

TMS
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