begi shanghai overboosting bad, spacer between turbo and dp? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-05-2015, 01:40 AM   #21
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I went ahead and got a 1/2" flange. If that doesn't work I'll tinker with it further. I think I need to make a build thread soon to log my progress
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Old 05-05-2015, 12:11 PM   #22
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Quote:
Originally Posted by DNMakinson View Post
This tells me that the problem is more likely in the actuator or some binding that is occurring only when the actuator is attached.

You are saying that the DP is preventing opening, yet with the WGA disconnected, that problem goes away.
^this

If it only makes 2psi with the actuator disconnected then the problem isn't the flapper opening. FWIW, my chinacharger was rated for 6-7psi but went to 9-10 out of the box. I got a 3psi actuator and it went to 6psi without a boost controller. You need a lower pressure actuator if you are going to run wimpy pressure.
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Old 05-05-2015, 12:15 PM   #23
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Quote:
Originally Posted by DNMakinson View Post
This tells me that the problem is more likely in the actuator or some binding that is occurring only when the actuator is attached.

You are saying that the DP is preventing opening, yet with the WGA disconnected, that problem goes away.
Quote:
Originally Posted by Lanceam24 View Post
I went ahead and got a 1/2" flange. If that doesn't work I'll tinker with it further. I think I need to make a build thread soon to log my progress
You need to listen to what David is saying before adding a crappy band aid that will add more failure points and potential leaks to your exhaust stream.

If you're not creeping with it disconnected, then this "spacer" is not the solution you're looking for.
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Old 05-05-2015, 12:18 PM   #24
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You're overboost is set to 8.7 psi....You have a 6psi wastegate, and 2psi of boost creep. TURN UP OVERBOOST. Your problem will be solved.

Or get a lower pressure wastegate, but thats money.
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Old 05-05-2015, 12:21 PM   #25
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he THINKS he has a 6psi wastegate. with begi, the chances of parts being the right ones are like 1 in 10000. so that may or may not be the problem. just cause its cutting out at 8.7 doesn't mean it won't go all the way to like 15. I think a log would probably show us more than OP is describing anyway
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Old 05-05-2015, 12:40 PM   #26
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I'll turn the over boost up and see how that works. This mainly worried me since I was running the kit just how it came (non intercooled). I was only trying to run what they advertise which is 6-7psi. I recently installed my ic so I'll turn it up and see how that works.
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Old 05-05-2015, 12:52 PM   #27
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Wire wastegate open and see what happens.
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Old 05-05-2015, 12:53 PM   #28
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Also, for the love of god stop just telling us numbers and post a log.
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Old 05-05-2015, 01:05 PM   #29
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Quote:
Originally Posted by aidandj
You have a 6psi wastegate, and 2psi of boost creep. TURN UP OVERBOOST. Your problem will be solved.
Quote:
Originally Posted by concealer404 View Post
Wire wastegate open and see what happens.
Quote:
Originally Posted by aidandj View Post
Also, for the love of god stop just telling us numbers and post a log.
THANK YOU.


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turn off overboost, and post the log to redline.
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Old 05-05-2015, 08:23 PM   #30
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Please call me at home: 830-885-2144 I should be able to help. You are also welcome to use email: [email protected]..... It may require more than one try.

I'll be home for another three weeks trying to heal up some neck surgery and the boredom is such a killer I've even resorted to looking at this forum.

Your call would be a nice relief,

corky
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Old 05-07-2015, 01:01 AM   #31
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ok, bolted everything back up.

first, wired wg flapper open. Logged a quick run and max kpa was 106...

then, attached wg back to flapper, set overboost to 250 and did another quick run. Max kpa was 155 (didn't take it quite to redline, but I never really do anyway).

now, the rod is adjustable on the actuator and I just barely screwed it in. I will go out in the morning and turn the threaded adjuster to make the rod shorter and see what that does.

seems to be fine now, maybe nitrodann was right and I just had to unbolt it and reposition it. Anyway check out the logs and tell me what you think because im a noob hah
Attached Files
File Type: xls datalog201505062156.xls (1.14 MB, 3 views)
File Type: xls overBoost250.xls (1.04 MB, 2 views)

Last edited by Lanceam24; 05-07-2015 at 01:04 AM. Reason: forgot second log
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Old 05-07-2015, 01:38 AM   #32
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Hard to tell what is going on without a working TPS signal on the graph, are you not going WOT until after 3500 RPM or are you WOT from low RPM and just making zero boost until you get over 3500 RPM? Can you get some logs where you go WOT from idle to redline in 3rd (or if road conditions allow 4th)? That will tell us spool, creep, max boost etc.

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Old 05-07-2015, 01:49 AM   #33
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not going wot until around 3500 or so, ill try again starting from idle
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Old 05-12-2015, 11:02 AM   #34
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Just to chime in with a similar situation, my shanghai downpipe prevents the wastegate from opening more than 20-30 degrees. I will test it this week with the actuator disconnected but I had the EBC set to 100 kpa and was getting full boost at ~12psi with creep up to ~14 at higher RPM. Even if it isn't the problem, a spacer would make me feel better from a fluid dynamics perspective and it looks like I have the clearance for it behind the turbo.



Attached Images
File Type: jpg IMG_20150509_1235016961_zpsbkhcnsco.jpg (252.9 KB, 72 views)
File Type: jpg IMG_20150509_1235113741_zpsaqesjl59.jpg (238.3 KB, 72 views)
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Old 05-12-2015, 11:13 AM   #35
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A spacer would not make me feel better becuase it's a janky band aid solution while adding another potential failure point. See if you can re-adjust like OP
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Old 05-12-2015, 11:21 AM   #36
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I was thinking if the spacer was steel I could just weld it to the DP flange and take out that failure point but I'll take your advice and pursue the cheap advice you guys have posted already
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Old 05-12-2015, 11:25 AM   #37
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I see. Well I guess if you welded it, that might actually be ok
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Old 05-12-2015, 11:39 AM   #38
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I wish I still had my setup to show the crack that is the T3 outlet.
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Old 05-12-2015, 11:43 AM   #39
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I'm just happy to have a cast manifold now instead of the swiss-cheese fake-SS ebay manifold that came with the car...
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Old 05-12-2015, 11:51 AM   #40
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Quote:
Originally Posted by Braineack View Post
I wish I still had my setup to show the crack that is the T3 outlet.
I wish you still had your setup for lots of reasons. King of MiataTurbo should have a TurboMiata. [or a bicycle, of course]
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