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Old 03-28-2008, 08:53 PM   #1
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Default Greddy wastegate/actuator being odd

Bought my Greddy kit used. Installed the turbo without messing with the wastegate settings. I was getting 3 psi on my boost gauge so I went to tighten the actuator rod to get closer to 5. I noticed that the actuator bracket had two washers betwen it and the compressor housing... interesting. I tightened the end of the rod down to where there were only maybe 3 more threads left unused on the rod, went for a drive and I wasn't even getting a solid 4 psi. So then I removed the washers - for some reason I was thinking they were setting the boost lower... went for a drive and I was at 2 psi. Obviously, the washers push the actuator farther away from the wastegate, so it tightens the wastegate actuator even more... so I found another washer and put it in between the bracket and the compressor housing, and I got 5 psi. The threaded rod is tightened down almost completely.
This seems odd since I thought you could adjust the Greddy wastegate up to ~8 psi by itself, and I've got ~1/4" of washers tightening the actuator down beyond what the rod can tighten down to and I'm only getting 5 psi max...
What gives? Could the actuator be leaky/bad? 4.5 doesn't come on until 4k rpms, but that's probably dur to the greddy downpipe and crap piping.
I'm installing my intercooler this weekend and will want to run 6 psi - as is, I don't think I can even adjust the actuator to get 6 psi.... what should I do?
-Ryan
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Old 03-28-2008, 09:14 PM   #2
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How much vacuum are you reading? I thought I had a similar problem until I realized that my vacuum was reading low -- something is wrong with my boost gauge or how it's hooked up.
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Old 03-28-2008, 09:20 PM   #3
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Eh, 8psi on the stock greddy wastegate isnt happening. 5-6 at the most is more like it. (if even, i get like almost 5 max).

Also peak boost at 4k is normal with stock dp and exhaust, get a MBC off ebay- then you can up your boost to 6 and have quicker spoolup.
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Old 03-31-2008, 12:41 AM   #4
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Thanks fireindc - sounds like mine is operating normally... any recommendations on which mbc to go with from ebay?
-Ryan
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Old 03-31-2008, 01:57 AM   #5
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Hmm, they are all pretty good from what ive seen.


This was my frist one, worked great and i sold it to my friend with a talon. Then i bought another one that was different but same basic design.

http://cgi.ebay.com/ebaymotors/NXS-M...em260224678655

this one is simple and works well.- cheap too. If you want one with more bling, there are others of the same style in diff colors.

I bought this one but have yet to install it.
http://cgi.ebay.com/ebaymotors/R-TUR...em170204442327

I like how the adjustment notches on it- but cant actually vouch for its performance.

Eh, any simple ball and spring MBC is ftw.
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Old 03-31-2008, 02:28 AM   #6
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Old 03-31-2008, 01:08 PM   #7
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I got 8psi with just my greddy WG. Added a spring and boost cut got me at 16psi
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Old 03-31-2008, 01:17 PM   #8
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im sitting pretty at 6psi with my stock wastegate, and it looks like i can tighten it more

take some pics of the waste gate actuator <-- that a long effin part name
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Old 04-01-2008, 01:34 PM   #9
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I'll take a picture of the wastegate actuator today to show you what I've got goinng on. I'll get a mbc but I've heard mention of a 300zx actuator supposedly being a lot better in some way? I can't find anything on that... would that be a good thing to upgrade too as well? Seems like it'd be inexpensive so if it helps, I'm all for it.
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Old 04-01-2008, 01:39 PM   #10
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MBC is less then 20 bucks.. how much more inexpensive could you get
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Old 04-02-2008, 02:29 AM   #11
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or go to home depot/ace hardware and buy a helper spring. **** you could make yourself a boost controller while your at it- but honestly the parts cost more than you can buy one for off ebay(at least thats what i found).
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Old 04-02-2008, 02:33 AM   #12
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I'm going to fit an FM1 WGA on mine after I get MS sorted out and feel comfortable in my ability to redo EBC tables.
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Old 04-02-2008, 03:00 AM   #13
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8 psi is possible with the stock Greddy wastegate actuator. Hell, 12 psi is possible. The problem, and why you need a helper spring, is that it won't hold boost through the powerband. I'll dig up a couple of dynoplots with the Greddy wastegate, with and without the helper.
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