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Old 05-31-2007, 08:33 AM   #1
Ole
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Default About to install greddy...

I just got my Greddy.. I have made the relief cuts, and are about to go out an buy some new and better bolts and some stuff for drilling the oilpan...

However, I have read that you recomend to tighten upp the wastegate?

Can anyone tell me why, and how much? What is the gain of doing this? Better spool up?

Ole
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Old 05-31-2007, 10:46 AM   #2
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Ole. Im not sure, but I am curious, What all are you going to be installing on your miata?
Thanks.
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Old 05-31-2007, 10:48 AM   #3
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the wastegate regulates your boost level. the shorter the wastegate rod, the higher the boost, to a certain level, probably around 7 or 8psi. the stock greddy level is around 4.5psi, and by tightening the wastegate rod a few turns, you can safely have 5psi. not a huge difference but a free one.
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Old 05-31-2007, 10:52 AM   #4
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so you cant turn up boost without doing this to the wastegate?
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Old 05-31-2007, 01:02 PM   #5
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yes with a mbc or ebc. both can go higher than the wastegate. some have used a die on the greddy wastegate to make more threads, and to be able to tighten the wastegate that much more. I'm not sure what the psi limits of shortening the rod are though
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Old 05-31-2007, 01:21 PM   #6
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Oh ok thanks. Hay curly, my set up is gonna be VERY similur to yours. what hp are you seeing and at what boost? 1/4 time?
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Old 05-31-2007, 01:33 PM   #7
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Also, if you don't tighten the wastegate a least a few turns, it will rattle at the stock setting. Very annoying.
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Old 05-31-2007, 01:53 PM   #8
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Also if its too loose it can pop off, stripping the threads. Then you need to JB weld that bitch back on (yes I speak from experience).
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Old 05-31-2007, 03:02 PM   #9
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Slidin'miata: 1. dunno 2. dunno 3. dunno. no wait, I'm at 7.5psi, I do know that. its faster than a stock miata, I know that too.
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Old 06-01-2007, 04:20 AM   #10
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I too can vouch the wastegate will rattle unless tightened. Just snug it up, but make sure the rod doesn't spin while you do this.
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