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Hey,

Just wondering what size external gate I will need. I currently have a RB20DET. I am buying a 6boost high mount external gate manifold, and am going to run a 3076 with 0.82 rear housing. The rb20det is just a motor for now, i am going to start to build a rb30det. but in the mean time i want some more power on the 20 and since all these mods are transferable ill do them to the 20 just for shits and giggles.

I will probably run 16-18psi on the rb20, and around 18-22psi on the rb30. I just wanna know what size wastegate i will need. I have been told anywhere from 38mm-50mm.

Also what is the adjustment range, like if i have a 18psi spring can i run anywhere from 16 to 22? I dont get how they work and i have googled and cant find any info

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https://www.sau.com.au/forums/topic/247764-which-wastegate/
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Did you read the FI Guide?

http://www.skylinesaustralia.com/forums/Fo...ick-t66556.html

It contains very useful links, such as this one:

http://www.skylinesaustralia.com/forums/ex...zes-t43638.html

Which is all about wastegate sizing and all the math behind it, so you dont even have to use the search button... :P

Locking this thread as this has been done, and quite well.

Please post in the thread linked if you to believe it does not help.

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https://www.sau.com.au/forums/topic/247764-which-wastegate/#findComment-4301605
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