I was able to find another CT15B for my 4th gen 3sgte. I was looking for one so I could get it rebuilt and upgraded without taking the car down for a few weeks during track season. I just got it in today.


I am planning to send it off to ATS Racing to get the "Sweet ct16" done to it. I am pretty excited!

At 17 psi both ATS and MR2Prime are advertising around 320 hp to the wheels. It may be more with my stage 1 Brian Crower camshafts.
My concern is the wastegate. The problem with the stock wastegate is that when I get on it the boost will shoot 1-3 psi past the target then settles in at the boost level I am shooting for. There is no way to adjust the OEM wastegate, it is sealed shut, does not have an adjustable actuating arm, and it is welded to the bracket.

I am wondering if it is doing that because it is wearing out.

ATS offers a billet adjustable wastegate upgrade for an extra $200. You can chose to have a 12, 14.5, or 17 psi spring put into it. I am wondering if that is the best option because when they mean adjustable does that mean you can adjust the actuating arm or does it mean you can swap springs? Is it a 1 or 2 port wastegate? If I go that route I plan to get the 12 psi one but I am a little uncomfortable with my base pressure being 12 psi. It will make it hard for me to set up boost by gear when I go standalone with that high of a starting boost level. Is there an option to go with a Turbosmart 2 port wastegate? Then I could have a low base pressure and with a 4 port boost controller. Then I can multiply that by up to 4 times and get my boost extremely acurate. Which Turbosmart model would I need? Which bracket would I need for it? I am planning to e-mail a bunch of these questions to ATS but I welcome any of your thoughts.
This post has been edited by HardHead93: Aug 21, 2017 - 9:28 PM