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Old 11-16-2009, 08:45 AM   #1
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Default Car won't hold boost for crap!

If this has been asked before and you know which thread it is feel free to direct me.
Ok so my turbo won't hold boost for ****! As soon as I go on boost it spikes to like 16psi then it goes down to 14psi where it should be and by 6k it's down at like 12psi. It really pisses me off cause I'm loosing 10-15 hp at top and my torque drops like a bitch. If you saw my dyno graph it also didn't help that I was going rich at 6k. Soooo what can I do to fix this?
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Old 11-16-2009, 09:42 AM   #2
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stock greddy wastegate right? look to replace the actuator or run some helper springs.
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Old 11-16-2009, 09:59 AM   #3
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Yes indeedy, my boost needle was all over the place until I replaced the greddy actuator. You'll probably end up with boost creep though. (positive)
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Old 11-16-2009, 10:16 AM   #4
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Yep- most IWG actuators start to flake out around double the rating in a boost controlled environment. BTDT. Logging a run with the wg wire shut does wonders for trouble shooting. Just make sure you've got your boost cut where it needs to be for the run.
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Old 11-16-2009, 11:14 AM   #5
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Which wastegate do you guys recomend?
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Old 11-16-2009, 11:54 AM   #6
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Old 11-16-2009, 08:10 PM   #7
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Where are you getting your signal for your wastegate from?
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Old 11-16-2009, 10:01 PM   #8
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I replaced my wastegate actuator with one from a new GT2871 and I got boost faster and held MUCH better than the Greddy unit.
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Old 11-16-2009, 10:10 PM   #9
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Quote:
Originally Posted by Fireindc View Post
Where are you getting your signal for your wastegate from?
Compressor
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Old 11-17-2009, 12:05 AM   #10
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Quote:
Originally Posted by miataspeed2005 View Post
Compressor
Then check out this thread my friend.

https://www.miataturbo.net/forum/t32479/

Should at least help the issue.. if not resolve it altogether.
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Old 11-17-2009, 02:25 AM   #11
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Quote:
Originally Posted by curly View Post
You'll probably end up with boost creep though. (positive)
If hes not getting boost creep now that means hes got plenty of flow bypassing the turbine so he wouldnt later.

What he has is boost spiking.


Here is where the WG is tied to.. (the line in the background is an oil line and doesnt connect to the wastegate in any way..)
DSCF0043.jpg
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Old 11-17-2009, 09:05 AM   #12
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Quote:
Originally Posted by Fireindc View Post
Then check out this thread my friend.

https://www.miataturbo.net/forum/t32479/

Should at least help the issue.. if not resolve it altogether.
Why is that not a sticky? That is awesome information, I'm going to try that and upgrade my wastegate. Tune my fuel towards redline a little and hit a dyno again should make a 10-15 hp difference
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Old 11-17-2009, 10:16 AM   #13
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Quote:
Originally Posted by miataspeed2005 View Post
Why is that not a sticky? That is awesome information, I'm going to try that and upgrade my wastegate. Tune my fuel towards redline a little and hit a dyno again should make a 10-15 hp difference
shoulda looked at how mine is plumbed when you had the chance...



The nipple just before the TB feeds the wastegate actuator. My boost is so steady you can rest your drink on it.
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Old 11-17-2009, 10:26 AM   #14
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Quote:
Originally Posted by Braineack View Post
shoulda looked at how mine is plumbed when you had the chance...
You shoulda looked at mine and helped a ***** out when I was complaining about my boost drop at the dyno
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Old 11-17-2009, 10:47 AM   #15
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hahah. or that. I was just trying to find someone for you that knew anything about the DINK ecu.
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Old 11-17-2009, 07:23 PM   #16
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Isnt your BOV open at idle/vacuum sir?

Quote:
Originally Posted by Braineack View Post
shoulda looked at how mine is plumbed when you had the chance...

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Old 11-17-2009, 07:32 PM   #17
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a little crack...why?
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Old 11-17-2009, 07:41 PM   #18
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Just curious since its still an unfiltered gap
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Old 11-17-2009, 08:17 PM   #19
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I don't care about things like that.
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Old 11-17-2009, 08:40 PM   #20
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Quote:
Originally Posted by triple88a View Post
Just curious since its still an unfiltered gap
Does air even get sucked into it? I'm pretty sure the airflow is always out the BOV never in.
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