need a bigger wastegate?

[thebeewantsboost]

i've got a 38mm ebay brand wastegate. basically a tial knock off. the spring is for 8psi. and it works like it should unless i'm racing, then in 3rd gear it creeps up to 13, feels amazing, and stays there lol.. do i need a bigger wastegate? its originally internally wastegated.. and it just clicked to me that maybe the hole for the wastegate may not be big enough... not allowing enought to bleed off... if i remember correctly most of the stock wastegate actuators were 13psi for these GN turbos maybe that's the issue... i need to be able to go down to 4 psi using a 4psi spring. in case my water/meth system fails. so i need to get this figured out. my wastegate is the 2 port style so i should be able to go up to 20 or so psi with a air regulator i think.

[3.4grapeofwrath]

Re: need a bigger wastegate?

The 38mm wastegate should be fine for your setup. Looking at your setup, from what I can see it looks like your downpipe piping needs to be corrected. The wastegate inlet pipe should come off of the turbo inlet pipe before the turbo not after the little port off of the turbo flange.
Can you take some more pics and angles of the piping?

[thebeewantsboost]

Re: need a bigger wastegate?

I dont think there was very much room preturbo especially for it not to be. At a 90 or anything. the manifolds merge right before the turbo. Could do twin wastegtes but seems like. Waste... Think I'm gonna try to port the turbos internal wastegate exit first... Lots of other stuff to deal with first, just looking for insight. Thank you. I'll try and post more pics. Anymore ideas are welcome.