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-   -   wastegate rebuild (http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/445578-wastegate-rebuild.html)

h20cooled7 12-09-2008 05:04 PM

wastegate rebuild
 
Bringing wastegate to replace diaphram and put 1.2 bar spring in. what am I getting into

A930Rocket 12-09-2008 05:43 PM

It's very easy, but if you have a vice or clamps big enough to slowly open and close the top, you'll be in better shape. Check the valve and valve guide for wear while your at it.

1.2 bar? Are you set up for that fuel and I/C wise? What are your other mods?

h20cooled7 12-09-2008 05:52 PM

i just got my WUR back from Brian Leask ,set it up for all my mods k27 ,******** full bay intercooler,fuel enrichment system, removed injectors to flush with a bosch injector checker, adjusting valves ,installing new plugs,rebuilding wastegate, and disconnecting manual boost and putting back to stock. Brian recommended installing the Innovate in cockpit air/fuel guage.

A930Rocket 12-09-2008 05:56 PM

The A/F gauge is a must. To be honest, I wouldn't go past 1 bar. That's what I've used for years with a rev limiter set at 6400 rpm. Makes the engine last a lot longer.

Just my .02

JBL930 12-09-2008 06:01 PM

1.2bar with stock internals? Have you done anything to the engine to cope with this? You need an awful lot more than an intercooler and fuel enrichment, which K27 turbo are you using? And who advised you to fit a 1.2bar spring anyway? If you do have a build that will cope with 1.2bar you won't want to run it at 1.2bar all the time surely?

h20cooled7 12-09-2008 06:02 PM

I'll take it , no mine would boost to 2 bar but I never really tried to go past a bar. I feel safer putting the 1.2 in it and see how it does. I was checking into a infared co checker but the Innovate seems more practical and about the same amount of money.

JBL930 12-09-2008 06:05 PM

Your 930 is set up to run 2.0bar :rolleyes:

h20cooled7 12-09-2008 06:10 PM

what is the stock boost anyway? I bought the car already modified. Its wicked fast so I just want to tone it down where I'm not gonna grenade it. Really not feeling finding a case for this thing. I'll get the wastegate broken apart and see what they did to it. Like I said this thing will wind up to 2 bar and I havent blown it in 2 years. I'll let you know.

h20cooled7 12-09-2008 06:11 PM

thats what the 2 gauges say

h20cooled7 12-09-2008 06:12 PM

stock 1 in the tach and the 935 gauge

A930Rocket 12-09-2008 06:13 PM

Factory is .8 bar.

A930Rocket 12-09-2008 06:16 PM

The stck gauge is very inaccurate. Is it a real 935 gauge? I believe they are inaccurate as well. A more modern NHS boost gauge would more accurate.

Quote:

stock 1 in the tach and the 935 gauge

JBL930 12-09-2008 06:30 PM

Anything over 1.0bar will require quite a bit of work to keep it together. To keep it together at 1.2bar would at least require stronger con rods and rod bolts, head studs and head sealing/flame rings. Then you would need good grade fuel and ideally twin plugs, at this point it is silly to keep the CIS system, you would junk this and go EFI. To go to 2.0bar you would need to have a magic wand, some magic beans and a magic carpet.

If your engine is stock internally do not take it above 1.0bar, definately get the Innovate LM1 or LM2 to help you dial in your adjustable WUR and also to keep an eye on your fuel regularly. It's good that you've got your injectors matched for flow as you'll be reading your AFR's from 1 sensor after the turbo, knowing you're getting equal flow is a good thing

gogomobil 12-10-2008 02:03 AM

did the engine get enough fuel for running 2,0bar?
It must be crazy fast with this pressure...

h20cooled7 12-10-2008 10:34 AM

ok the spring is a 1 bar spring thats going in. i understand the one side of the diaphram is held in the cup by a 10 mm nut how do you seat the other side of the diaphram?

RarlyL8 12-10-2008 06:22 PM

Could be a confusion of definition between measured boost and absolute pressure. Air pressure at sea level is 1bar. Some gages read in absolute which means 1 bar ambient + 1bar boost = 2bar.

Either way please do not use more than a 1.0bar spring, the stock air cooled 930 engines are not designed for it.

fredmeister 12-11-2008 07:36 AM

Quote:

Originally Posted by RarlyL8 (Post 4353237)
Could be a confusion of definition between measured boost and absolute pressure. Air pressure at sea level is 1bar. Some gages read in absolute which means 1 bar ambient + 1bar boost = 2bar.

Either way please do not use more than a 1.0bar spring, the stock air cooled 930 engines are not designed for it.

Great point.
I like the VDO gage that reads -0,5 Vacuum to 1.5 bar boost for this reason and like to see the vacuum on th engine when running low load or cruising. The 2.0 bar gage is like having a 200mph speedo in a Toyota Corolla.

h20cooled7 12-11-2008 09:00 AM

When I disassembled the wastegate I was more worried about getting shot in the head so I got ahead of myself. Just so I can sleep at nite can you verify that I did this right Almighty Porsche Gods. I removed the cup that holds the diaphram (10 mm nut w/ washer). Folded diaphram and put cup inside diaphram and tightend 10mm nut. Pulled lip of diaphram over wastegate housing . Put the shims on each side of spring and compressed and testsed. waste gate opens with compressed air and seems to be working ok. Does this sound rightbefore I install on car?

A930Rocket 12-11-2008 10:01 AM

Sound right, but any pics?

h20cooled7 12-11-2008 10:25 AM

No pics, should of took as I disassembled then I wouldnt be writing this. Ill try it out and see what happens


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