Got a quick question here fellas hoping someone can help me out. how do you test for a bad turbo or what are the signs of a turbo goin bad??? i recently did a turbo swap in my 94 lancer gsr 1.8t, basiclly put an evo 2 TD05H in. with the stock TD04H it does .8 bar and fully spools up at around 3000. now with the TD05H in it only goes up to .5 bar and it fully spools up around 4000. thanks bros

signs of a bad turbo, while holding the turbo in your hand, are the main shaft being able to be "wiggled" around.

bent, chewed up blades.

looking inside the compressor housing and seeing a large gap between the blades and the housing, or grooves where it looks like the blades have come into contact with the housing.

On the car, typically with that much shaft play, the oil gets past the bearings and oil seals, and leaks into the intake piping. this gets into the combustion chamber, and goes out the tail pipe as blue-ish smoke, much like worn piston rings look like.

There is also the infamous turbo death whine.

hope that helps.

Thanks bro... that turbo whine of death, is it super loud like a baby crying or is just suttle, cuz i know that the turbo makes noise on spool up sooo... yeah

depends on how bad the turbo is. the longer you run it, the more it will scream like a crack whore.

is it an actual mitsu turbo, or a knock of brand...?

what did you all swap over? just the turbo, turbo + wastegates, change out headers, turbo, wastegates, everything?

Did you check well for exhaust leaks?

it's no suprise that a bigger turbo will spool later in the RPM band, but it should produce more overall boost unless it's an inferior turbo design.

its a mitsubishi turbo... got it right off an evo 2. the guy was junking the car cuz he smashed the rear end in so he parted it out. but anyways the turbo doesnt make any noise aside from the normal noise that all turbos make. the swap was just the turbo but i hooked up a different 02 housing, the actuator pipe opens a foot off the turbo, so it get really loud when the actuator opens... anywho thats all i changed. my machanic said that the actuator on the turbo might be broken so im gonna replace that if i ever find one. and i was thinking it might be just that maybe its not closing all the way or something cuz when i stomp on it i can hear the actuator dump slightly open... so hope fully that will fix the .5 bar and slightly bring my spool time down

So you have O2 dumps?

well, anywho... I'm still confused. did you use the actuator off the new turbo or the old?

the actuator on the new turbo may be set to open at .5 bar.

you can change that by getting a boost controller.

**WARNING - I take no respondsibility for anyone else's car, even if they follow my advice. my car gets enough abuse from my stupidity without adding other poeple's cars to the mix. Use this advice at your own risk END WARNING**

or you can test the turbos by removing the vacuum line to the turbo.

This should keep the wastegates closed. Be careful, though, as you'll easily overboost your engine, and you WILL kill it. If you still hear the dumps opening, then yes, the exhaust is forcing the flapper open.

Just get on the gas progressively, and if you see the boost go higher than .5 bar, let off instantly, as I have no idea what your car will safely boost to.

Which is another point that should be made. with a bigger turbo, at .5 bar you may have the same CFM going in your engine as the old turbo at .8 bar. you will need to watch your A/F and knock count.

If the wastegate is opening, you can "shim" them with washers, ghetto style. or get helper springs.

Or hook up an air compressor and see if the waste gate moves... that may tell you something. (like it's set to open at .5 bar.... :) )

hope that helps.

thanks fro the help bro

http://www.slowboyracing.com/more.php?id=4850&

here is the link to the o2 housing that i put on there. as you can see the actuator side i open so thats why i can here when my actuator really opens up cuz it gets really loud. my problem is the actuator is open a little, just a crack, while boost is building up i know this cuz i can hear it. the actuator cant hold the flapper down so its leaking, so that might be why it takes forever to reach that .5 bar. and no i didnt use the old actuator i used the one from the evo that was already on the turbo. well anyways im going to change the actuator and see what happens. i could just put a boost controller on there but it wont fix the boost leak problem, but i will put one eventually. thanks again for the help bro... :57: