speeder Posted July 1, 2002 Share Posted July 1, 2002 I have an L28, T3/T4 w/internal wastegate,HKS EVC-EZ, 370cc injectors, Electromotive, that was pretty well dialed - in before I went to a monster larger Intercooler, 550 cc injectors, and 3" exhaust from turbo outlet to tailpipe. Now I can't control boost very well - looks as if it tries to hold at a 12-15 psi setting before ramping up to almost 20 psi. Others have told me I should have sufficient wastegate control as-is to handle my setup. I've checked hoses, etc, bypassed the EVC and it still acts the same. Is there something I've overlooked, or is it time for an external wastegate or bigger turbine housing? Thanks for any advice you can provide. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted July 1, 2002 Share Posted July 1, 2002 What kind of waste gate actuator are you using? If you are using the stock nissan one, it is not up to handling the job. I have a dual port I bought from Topend and they fabbed me a bracket after I clocked the turbo and sent to them. I use a manual boost controller on the bottom port to add a little boost to keep the wastegate shut. It works well. I have not had any boost creep issue's, since using this actuator. You may be flowing to much air for the turbo to bypass thru the internal gate, which means you would need to go to an external wastegate, and the little turbonetics delta gate is no big enough, IMO. You could raise the boost some and see if that helps. What are the specs on your hybrid? Do you know what wheels are in it? That would help. Quote Link to comment Share on other sites More sharing options...
speeder Posted July 2, 2002 Author Share Posted July 2, 2002 The wastegate actuator is the dual port one that TEP sells. I have increased the length of the actuator arm so that there is minimum spring tension holding the swing valve shut, and still won't hold the boost down. One thing I will try is to decrease the arm length, but that seems to be tweeking in the wrong direction? This problem seems to be a case of not enough bypass flow.If this (arm shortening) doesn't help,I have decided to go to a Tubonetics Race Gate. I bought my turbo from TEP - Asked for a turbo sized to provide good response with respectable power - I don't know any specs - except that I have a "Super V" Compressor wheel. I like the response of a small turbine - But will definitely check Turbine A/R numbers while the turbo is off for manifold mods. (changed my sign ature to my log-in name) Thanks, Quote Link to comment Share on other sites More sharing options...
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