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Old 02-07-2008, 01:19 AM   #1
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Default Begi-s boost creep issues

Basically I have a begi s kit no intercooler with the gt2560 and am having some boost creep issues. The wastegate is rated for 6 psi, but I am seeing boost in upwards of 10-11 psi. Right now i have overboost protection on my ms set at 7psi, but this is only a temporary solution so i can drive the miata around town. I don't feel like removing the turbo to have it ported so is there anything simple i can do to combat the issue.
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Old 02-07-2008, 01:22 AM   #2
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Could it be a clearance issue with the DP now allowing the wategate to open fully? This was an issue with some of their other DPs.

Call BEGI.
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Old 02-07-2008, 01:28 AM   #3
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It seems to be hit or miss. Mine as well as my friends begi s kits are seeing boost creep, but i have heard other individuals kits holding at 6.
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Old 02-07-2008, 05:28 PM   #4
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What are the numbers on the side of the actuator? I just want to make sure you have the correct one.
Stephanie
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Old 02-07-2008, 05:32 PM   #5
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Read through this as well. Not exactly the same but some of the same issues might apply to you.
https://www.miataturbo.net/forum/sho...ht=boost+creep
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Old 02-07-2008, 11:55 PM   #6
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Quote:
Originally Posted by Stephanie Turner View Post
What are the numbers on the side of the actuator? I just want to make sure you have the correct one.
Stephanie
the number on the wastegate is 480009-9
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Old 02-08-2008, 06:47 PM   #7
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can anyone confirm if this is the correct wastegate
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Old 02-08-2008, 06:51 PM   #8
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That is the 7 psi actuator. What downpipe do you have?
Stephanie
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Old 02-08-2008, 07:06 PM   #9
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I have the standard downpipe included in the 1.6 s kit
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Old 02-08-2008, 07:10 PM   #10
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Interesting. That should not be happening. Let me talk to Corky and I will get back with you. Can you shoot me an e-mail?
Thanks,
Stephanie
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Old 02-08-2008, 07:11 PM   #11
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thanks and I will e-mail you as soon as possible
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Old 02-09-2008, 11:05 PM   #12
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I'm looking into the 2560 kit myself. Keep us informed guys. Thanks.
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Old 02-09-2008, 11:28 PM   #13
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Ditto - I have one on order.
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Old 02-21-2008, 06:04 PM   #14
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same here too
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Old 02-21-2008, 06:54 PM   #15
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The wastegate will need to be modified so when i have time i have to send bell engineering the exhaust housing from my turbo.
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Old 02-21-2008, 07:32 PM   #16
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My BEGI-S kit (with a GT2560) should be ready this weekend and BEGI should have the turbine housing ported already. I'll take pictures of the wastegate area after I pick up the kit.

So, I think the DP is designed to bolt to the stock exhaust. I think I will install it initially with the stock system, then go get the 2.5"-3" system soon after. It would be interesting to do a before-after to look at several things, including boost curve behavior. I'll have MSI by then so I can log everything except horsepower. I could do something simple like a 3K-7K RPM timed run in 4th gear on a flat road.

I'll be happy to do a before-after HP run if someone else wants to pay for the dyno time
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Old 02-21-2008, 08:14 PM   #17
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Its not a matter of porting the turbine housing, its a matter of the welded plate in the outlet flange that is not allowing the wastegate to open to its maximum potential.
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Old 02-21-2008, 08:48 PM   #18
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Quote:
Originally Posted by Saml01 View Post
Its not a matter of porting the turbine housing, its a matter of the welded plate in the outlet flange that is not allowing the wastegate to open to its maximum potential.
Paul runs the same gt2560r. His only issue with the turbo was the small WG port. After porting it he had solid boost control. He had no actuator issues like some see with the BEGI divider plate. So in reality, the port is too small no matter what if you have any kind of free flowing intake and exhaust. The fact that some downpipes needed adjusting was a completely different issue that only some were affected by.

Zx-tex. I strongly suggest you take your turbine housing off and take the time to port it. As hard as you plan to drive your car, it will be more than worth while to you.
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Old 02-21-2008, 09:14 PM   #19
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I exchanged e-mails with Corky a couple of times and he said the correct way to remedy the problem would be to port the wastegate, re-install the cat, or place a restrictor in the exhaust system somewhere. Installing the stock cat or placing a restrictor in my exhaust would be taking a step back so my only option is to port the wastegate. My boost creep issues are most likely linked to my test pipe and exhaust system. I know a few people running the kit with stock exhaust and the kit runs 6psi all day.
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Old 02-21-2008, 11:19 PM   #20
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I don't think this one is the downpipe. The BEGi-S downpipe has more clearance than any ever made. The flange is actually two welded together and the internal flange is completely open. It is the same flange we have been using for 10 years.

Corky has decided that we are going to port all turbos in an effort to reduce the chance of over boost. Hopefully it will do the trick.
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