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External Wastegate: where does the top nipple go to?

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6.6K views 12 replies 7 participants last post by  Rockwood  
#1 ·
I've got a Tial 38mm, and the side port is connected to the turbo, currently the top port isn't connected. Should it go somewhere?

thanks,

Chuck
 
#10 ·
ecoliburger said:
Top port is to run boost back into using a B/C. It lets you run higher boost say you have a 3# spring, your WG would open at 3psi. The port allows you to force the valve closed using boost pressure. Thus you can run higher boost with a lower spring pressure.
yes, only through an electronic boost controller though. if you are going to run a mechanical boost controller with an external gate, i would hook it up between the boost source and the nipple on the side.

dont plug the top nipple into boost lines without an EBC. if you do, the WG will only open under vacuum. this will result in as much boost as your turbo can supply, which is probably somewhere past 30 psi if you have a larger turbo. not good.
 
#12 ·
sonnypippo said:
what if you're not using any boost controller? do you just leave the top nipple alone and the side nipple goes to the boost source? i'm asking about a 35 mm tial... never seen one in person.
That's exactly how mine was setup by the fine folks at J&M Motorsports in Meriden, CT, as I'm wastegate only at the moment w/my T3. I think it's simply how it is supposed to go, but I was under the car checking hoses and such, and thought maybe something popped off. It sounds as if it is supposed to be unused if you don't have an EBC.

-Chuck