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-   -   Wastegates? (http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/327917-wastegates.html)

JMA-RUF 01-31-2007 02:01 PM

Wastegates?
 
What aftermarket wastegates are you guys running?

I know of the Tial units, but they are expensive :(

The OEM ones look big and HEAVY :(

Anyone used the JDM or XS Power 46mm Wastegates, or have any experience with them?

Porschefile 01-31-2007 05:21 PM

I'd stay away from those Taiwanese/Chinese knockoff wastegates you can find on Ebay. They are inferior quality and I've heard of many problems associated with them, such as failing in the closed position, not sealing properly (poor wastegate to seat clearancing), etc etc. Japanese wastegates like HKS, Trust (Greddy), etc are all pretty decent quality and work well though no one compares to Tial IMO. Honestly, I'd just spend the money on a Tial as it's the last wastegate you'll ever have to buy.

JMA-RUF 01-31-2007 06:01 PM

Hmmm.. I guess the wastegate does an important function, so probably best not to skimp there, for the sake of a few dollars :confused:

BoxxerSix 01-31-2007 06:28 PM

Quote:

Originally posted by JMA-RUF
Hmmm.. I guess the wastegate does an important function, so probably best not to skimp there, for the sake of a few dollars :confused:

Yes....inferior/cheap wastegate = poor performance = possibly sticking and boost overrun = expensive collection of metal behind you.....

Tial, a bit pricey but you get what you pay for.

930LDR 01-31-2007 06:48 PM

James... I am taking off my TiAL and will be selling it. Has about 3000 miles on it and comes with a variety of boost springs.

Let me know if you may be interested.

beepbeep 02-01-2007 03:44 AM

I find OEM wastegate very good. It's rebuildable and big enough to support really big HP-numbers.

Smaller wastegates will work, but there is a chance of running into problems if you start using big turbochargers and less-restrictive exhaust. The less backpressure you have pre-turbo the bigger wastegate you need to re-route the gases around turbo.

WydRyd 02-01-2007 01:51 PM

Quote:

Originally posted by beepbeep
I find OEM wastegate very good. It's rebuildable and big enough to support really big HP-numbers.

Smaller wastegates will work, but there is a chance of running into problems if you start using big turbochargers and less-restrictive exhaust. The less backpressure you have pre-turbo the bigger wastegate you need to re-route the gases around turbo.

Goran/anyone, are there custom boost springs available for the OEM wastegates? Like, 0.7bar springs?

Was the factory spring 0.7 or 0.8bar?

Jeff Hail 02-01-2007 04:23 PM

Re: Wastegates?
 
Quote:

Originally posted by JMA-RUF
What aftermarket wastegates are you guys running?

I know of the Tial units, but they are expensive :(

The OEM ones look big and HEAVY :(

Anyone used the JDM or XS Power 46mm Wastegates, or have any experience with them?

Thats BIG and HEAVY
http://forums.pelicanparts.com/uploa...1170379414.jpg

BoxxerSix 02-01-2007 04:47 PM

Quote:

Originally posted by WydRyd
Goran/anyone, are there custom boost springs available for the OEM wastegates? Like, 0.7bar springs?

Was the factory spring 0.7 or 0.8bar?

.7 bar.......I believe Powerhaus sold 1.0bar springs for the 930/965 wastegate. Not sure about Andial...Andial is the only place I know of that still sells the boost diaphram for rebuilding the wastegates so you may want to give them a shout.....

WydRyd 02-01-2007 05:11 PM

cool - for some reason I always thought the stock 930's had 0.8bar springs :confused:

juan ruiz 02-01-2007 06:45 PM

Im not sure if anyone has or makes the next generation of blowoff valves and wastegates, In our never ending quest for power with our new race car we came across a company that is making this products like I have never seen them before, they actualy use a valve with a valve seat and a valve guide.

we will be testing them and we see the results.

Externally clock able pressure ports- For ease of installation
2.25" V-band connections- For 2.25" OD pipes and tubing (2.125" ID). Includes clamps and flanges
60mm SS valve- Big enough for even the largest turbochargers holding low boost
Silicone O-ring and piston type actuator- For long cycle life and easy track side repair if needed.All CNC machined construction- For style and excellent tolerances
3 Series SS valve housing- For excellent corrosion resistance
Nickle Aluminum Bronze valve guide- For very high exhaust temps and anti-seizing properties
V-band actuator fastener - For quick and easy service
Includes - Std., Medium, and Large springs
http://forums.pelicanparts.com/uploa...1170387917.jpg

BoxxerSix 02-01-2007 10:25 PM

Quote:

Originally posted by WydRyd
cool - for some reason I always thought the stock 930's had 0.8bar springs :confused:
Maybe they are :confused: My stock 965 always read .7 bar when I got it and before I tore into it so I just assumed. Could have been weak or a bad VDO reference sensor in the IC too. Don't know, it didn't stay stock for long..

WydRyd 02-01-2007 10:29 PM

Maybe the 930's were 0.8bar and the later 965's were 0.7bar?

beepbeep 02-02-2007 12:05 AM

1. There is no "speed quest" in designing BOV's and wastegates. BOV is active only during throttle liftoff and is kept shut during accelleration. It doesn't "provide speed" in any way. Unfortunately, it provides millions of youngsters a chance to dream about being one of characters in Fast and Hilarious when they drive around in their sneezing VW 1.8T's. When it comes to wastegate, it just opens a valve and let the gases go around the turbo. Albeit wastegate is more critical from material standpoint then BOV, I really don't think engine will notice if 40mm valve is OEM or Greddy or chinese copy or whatever. It's just a valve.

2. Installing harder spring in wastgate in order to raise the boost is not recomended. It's much better to keep OEM 0.7 bar spring and raise boost trough boost controller or T-orifice. That allows you to go back to stock setting if needed w/o tedious process of opening the wastegate and swapping the spring.

WydRyd 02-02-2007 01:35 AM

Totally aree BeepBeep... what I'm trying to determine is whether the OEM wastegate was preset to 0.7 or 0.8bar. This is for a friend's high compression bolt-on setup. The difference in 2psi can blow his engine, so I need to know if the OEM setup was 10psi or 12psi :)

ben parrish 02-03-2007 07:02 AM

Who makes rebuild kits for the factory wastegate? How/where can you get a .5bar spring?
Thanks,
Ben

Porschefile 02-03-2007 12:43 PM

Agreed Beepbeep. Too many people think you actually gain power with BOV's. ;) Though, there are definitely improvements that you can make by using them. In my experience, the stock 951/965 type Bosch plastic bypass valve is relatively weak and easily wears out. I've had the problem multiple times on multiple cars where they get worn out and don't remain 100% closed in off boost conditions. Because of that, then you see increased spool time initially as well as between gears. There are aftermarket units like Forge BV's that are just made of better quality materials and function better, so there are improvements to be made. Not to mention, there are some BOV's like the HKS super sequential which have a pull type valve. I personally love those a lot as it's physically impossible for them to leak, so basically you'll never have a problem and you can still recirculate if you so desire. Anyways, the only thing BV's/BOV's will ever do is eliminate lost power and lost response, though they certainly don't "add" power.

NathanUK 02-03-2007 02:36 PM

Quote:

Originally posted by BoxxerSix
Maybe they are :confused: My stock 965 always read .7 bar when I got it and before I tore into it so I just assumed. Could have been weak or a bad VDO reference sensor in the IC too. Don't know, it didn't stay stock for long..
You are aware that the stock gauge only goes upto .7bar ?


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