Hi, i started building my custom turbo kit for my 04 lancer es and there is some things i don't have answers to...im going to be using a 16g6 td05hr 9.8t evo 8 turbo. I was wondering how much psi is the spring on the stock wastegate? Iv heard from different people it was 9..some say 11...some 14 psi. And i was wondering how high octane fuel i need to use on a stock internals setup at 9 psi of boost. Trying to have everything setup and ready before i start the engine and tune it. Thanks, Alex

 

search.....for the love of god....search

 

use the highest they sell around you. Around me its 93 so I use 93

 

And how much psi spring is the stock wastegate?

 

Its too high so your gunna have to get another waste gate. You'll need to run the highest octane you can get. A lot of questions are answered in stickeys/ build threads

 

This doesn't answer my wastegate question though...

 

If you hit up the evo forums here and type evo 8 wastegate I gaurentee you will find it in less than 5 mins

 

i'm willing to bet the misinformation is similar to the older 4G63/DSM situation, where the stock wastegate actuator is rated for like 7-8psi, but a boost solenoid (stock boost controller) bumps it up to like 11.5-12psi or something like that...for my build i used the internal wastegate, and just bought a 9psi actuator, i run 91 octane, but i have a very good tuner

 

I did try to look but i can't find anything that confirms the stock spring rate w/o the boost controler!....

 

if you have or can use an air compressor with a regulator that is graduated for 0-15psi (most small portables are not accurate below 20psi) you can set the regulator to 5psi, and connect a vacuum hose from an air duster to the wastegate and slowly increase pressure till it opens.

 

Google stock boost on evo 8. Answer in Seconds

 

you still find a mix of answers cause people post wastegate pressure, and manifold pressure (pressure as a result of boost solenoid) etc. OP, i would just get an aftermarket adjustable actuator if you're worried about it.

 

Yea that's what i was thinking of doing with the compressor stuff....but to know the spring rate the wga has to be completely (100%) opened to know how much psi is the spring right?

 

yeah, it'll give you a pretty good idea...

 

I saw they sell wga springs at some places...can you change the spring only or there is no way to open up your stock wga to change it? thanks