gt2560r Wastegate porting for 3" exhaust ??? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-25-2014, 10:39 PM   #1
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Default gt2560r Wastegate porting for 3" exhaust ???

Curious if anyone can tell me how wildly you need to port the wastegate on a gt2560r to keep a boost level of around 10-12psi Im just looking for 220whp and would like decreased spool time with the 3" exhaust but dont want to run into alot of creep issues. so im asking this question before I order my exhaust

is this enough porting to run 10-12psi with 3" exhaust ?



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gt2560r Wastegate porting for 3" exhaust ???-0929122032a-1.jpg   gt2560r Wastegate porting for 3" exhaust ???-0929122031a-1.jpg  
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Old 07-25-2014, 10:43 PM   #2
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I'd widen the valley up to the width of the hole if I still had the housing off. If not, run it and see what happens.
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Old 07-27-2014, 04:54 AM   #3
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anyone else wanna chime in ? gotta be a couple thousand members on this site with a 2560 and 3" exhaust
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Old 07-27-2014, 12:08 PM   #4
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I just made this thread last week

https://www.miataturbo.net/general-m...aterial-80058/

tl;dr remove more material then I did, I still have creep.

Look at Kenzo and Erats pictures.
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Old 07-27-2014, 12:57 PM   #5
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your down pipe design could have something to do with creep. I have a 2560r only the inside being ported and it's fine. I have 3" exhaust too. 0 creep for me. by the way there are like 10 old threads wth multiple pages on this junk. search harder.
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Old 07-27-2014, 04:32 PM   #6
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Quote:
Originally Posted by Onyxyth View Post
I just made this thread last week

https://www.miataturbo.net/general-m...aterial-80058/

tl;dr remove more material then I did, I still have creep.

Look at Kenzo and Erats pictures.
You didnt touch the port under the flapper did you? Its hard to tell from my pics but i opened that area up a decent amount on mine
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Old 07-27-2014, 05:58 PM   #7
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I did not. I probably should have.
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Old 07-27-2014, 07:23 PM   #8
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Did some more porting on it today. Also added a little channel in my begi manifold to help the exhaust find its way to the wastegate port
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gt2560r Wastegate porting for 3" exhaust ???-cam00057_zpsgupckjta.jpg   gt2560r Wastegate porting for 3" exhaust ???-cam00062_zps7bmikd5v.jpg   gt2560r Wastegate porting for 3" exhaust ???-cam00063_zpsfpaoghfc.jpg  
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Old 08-15-2014, 02:32 PM   #9
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Did you buy this turbo form BEGi? they should have ported it then
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