I'm looking to lower the stock boost on an Evo 8. The best way I can think is to either dismantle the current actuator or to take an actuator from another turbo that is made for about 5-6 psi. I couldn't find any DIY that's include this and I haven't been able to find an actuator for the turbo that is under the stock 11 psi. I have heard of people cracking it open and cutting away at the spring, but that's kinda brute force and also I don't know how to weld.

If you're just going to criticize as to why the hell someone would do that, then I'd rather not hear the comments. I have my reasons and I don't feel like going into a full explanation.

Has anyone ever done this? And if so what's the best/easiest way?

 

Good luck finding that one out, I've never heard of anyone trying to do that. sorry....

 

Ease up with your right foot or take the WGA arm off the WG flapper.

 

How much lower do you want it? Set up ECU Controlled boost and run it at 15 or 16 psi that's probably the easiest way.

 

He wants to run less than stock WGA pressure of 11 psi. Why? Who knows...

 

Uhh hey guys I wanna get laid less... does anybody know how I can do this???????

 

How about an adjustable/threaded wastegate arm and adjust the boost there? I know HKS makes some for some other japanese cars ... start there ...

 

I dont get this.

 

Wastegate pressure makes our cars dogs, like civics, and the fuel economy is great. I can only think of 2 reasons. 1. Broke, can't afford gas, being economical. 2. In trouble with the law and can't stop speeding so wants to make his car as slow as possible.

Rent a Hyundai for 18/day

 

psi has nothing to do with MPG. The ecu will compensate for psi changes in the a/f and load maps.

Lowering boost will not get better MPG. A proper tune will.

Keeping your foot out of boost also helps with MPG.

 

If you can't afford gas maybe you should consider a different vehicle.

 

take off the wga?

seriously though, whats the story behind this one?

 

Dont know why anyone would want to but to each his own. You can run WGA psi like others have said but what about looking into the 1st gen dsm's they ran 11psi from the factory. maybe try to set it up the same way, might be something to look into. Im trying to figure out how i can run 30psi safely, ha.

 

what it looks like

http://www.hksusa.com/products/?id=665

 

If all you want to do is to keep your 11# base pressure turbo from going over 6#, than you could install a VTA compressor bypass valve with a 6# spring. The 1975 BMW 2002 factory turbo cars were not equipped with a wastegate whatsoever. Boost was controlled at 7# via a simple compressor bypass valve located on the charge pipe right before the throttle body.

You should be able to order one of these 7# bypass valves along with its flanged bolton base and gasket set, from the BMW dealer if the 1974-75 2002 factory turbo is in the parts counter´s computer files.. Thus, equipped the bypass valve would control maximum boost eventhough the turbo´s base pressure is set at 11#.