possible wastegate blowopen solution?

[boosted86]

i just bought a 20g that has a 17c compressor housing on it . the internal wastegate that is installed i believe has a 5lb spring installed. the turbo will not boost over 20psi, due to the spring not being stiff enough ( wastegate blowing open) ive tried adjusting the rod all the way in and the max i can get out of it is 19psi ( with the mbc also screwed all the way in). so i was thinking of a solution that might put more force on the actual flapper ( to help keep it shut... i came up with installing a utilitly spring from the flapper arm to a solid structure ( wastgate bracket, fan housing etc.) ive attched a pic that i made real quick to better illistrate my idea....

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obviously, the amount of tension that will be applied will be directly related to the distance the spring is mounted and the spring itself, but in theory it should work? right.. lmk what you guys think.

 

[JusMX141]

This has been attempted and done somewhat successfully in the past. There is actually a version of an actuator available for diesel trucks that utilizes only an adjustable spring- no diaphragm or air pressure.

Your best bet is to upgrade your actuator head using a Holset actuator, similar to what I've done here:

http://www.dsmtuners.com/forums/tur...oking-strong-internal-wastegate-actuator.html

Check the latest post in that thread to see the results from an actuator that I built for pboglio just last week.

 

[boosted86]

damm should have had you install one of those holset actuators when you were rebuilding my turbo im going to try this out and see how it works... ill post back the results

 

[forcefed86]

i just bought a 20g that has a 17c compressor housing on it . the internal wastegate that is installed i believe has a 5lb spring installed. the turbo will not boost over 20psi, due to the spring not being stiff enough ( wastegate blowing open) ive tried adjusting the rod all the way in and the max i can get out of it is 19psi ( with the mbc also screwed all the way in). so i was thinking of a solution that might put more force on the actual flapper ( to help keep it shut... i came up with installing a utilitly spring from the flapper arm to a solid structure ( wastgate bracket, fan housing etc.) ive attched a pic that i made real quick to better illistrate my idea....

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obviously, the amount of tension that will be applied will be directly related to the distance the spring is mounted and the spring itself, but in theory it should work? right.. lmk what you guys think.

Yes it works just fine... Although even with more pressure than a holset actuator my boost did not increase anymore than the holset actuator installs.

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[pboglio]

I got mine from Jus, worked great in holding more boost. My buddy with his EVO is also trying the "spring" mod since he doesn't like spending money. I personally like the clean stock look of Jus's internal gate mod myself.

 

[forcefed86]

I got mine from Jus, worked great in holding more boost. My buddy with his EVO is also trying the "spring" mod since he doesn't like spending money. I personally like the clean stock look of Jus's internal gate mod myself.

Between all the piping and other misc crap, you really couldn’t see the springs. I was just testing the more spring pressure theory. Seems any more than 17-18psi doesn’t net any higher boost. Didn’t in my case anyway. I can take all the springs off and still reach the same boost levels. I think the problem is the 16G’s are running on the ragged edge to hold 30+psi. So once you’ve gone as far as you can with the WG, you have to spike the crap out of them and then port them to creep to maintain 25+psi to redline. I spike to 34-35 now and settle to 25 by 6k.

I’m sure with a larger turbo I could hit 35+ with my WGA and an internal gate.