i know most of you guru's on here will think that i'm a moron, and that's fine with me. but in my boredom of driving a truck today, i wondered if it would be possible to turn the boost all the way down to zero, and just run the motor. or would that screw something up? just a curiosity question.

 

Its not possible. With the boost turned all the way down, the wastegate will still be running 11 psi.

 

I have seen that happens on a few of my turbo cars in the past only when the turbos were completly frozen.

If you have a MBC and turned all the way down you might almost get 0 psi as well. A partially open BOV or partially open wastegate actuator could also prevent you from building any boost at all.

Carlos

 

Not with the MBC, but you can run 0 boost if you disconnect the wastegate arm, I believe.

 

If you have a partrially open wastegate you might build absolutely minimum boost but most of the air would escape fast.

I am not here to contradict anyone though, I am not saying is not possible. I am refering to a situation where a opening exist and the turbo can't simply generate boost fast enough.

But I can confirm that 2 frozen turbos on a Stealth TT that I had gave me absolutely 0psi. If a turbo is healthy and unless you have a big big leak you should be able to generate at least minimal boost.

Carlos

 

Actually, there is an on-off switch for the turbocharger located just behind the hotside. Just kidding, what was typed above is true due to the wastegate.

 

nothing frozen or any problems or anything like that. i was honestly just wondering how the 4g63 did by itself without the turbo. may make for some closer races too

 

well, the car has a 11psi wastegate so unless you modify the wastegate you still will build boost...where in Milwaukee are you?

 

With 0 boost, the Evo is a dog just like any regular Lancer...probably slower than a Ralliart.

 

I can tell you exactly how it feels. It feels slower than the non turbo 140HP twin cam 16valves. The 4g63 shines when works with boost, without the turbo the engine revs up very slow and basicly takes forever to go above 5000rpm.

A frozen turbo still on the exhaust manifold is perhaps one of the worst things you can do to your car. The exhaust gases have absolutely no way to go, the tuirbo clogs the exhaust gases.

As I mentioned before, I once bought a Stealth R/T twin turbo with both frozen turbos(lack of oil to the oil supply lines due to poor quality oil and not cooling them down), the car ran approximately a 10 sec 0-60. It was way worst than the Non turbo version. The same theory here, the turbos when frozen are robbing you a lot of power.

Carlos

 

If you disconnect the wastegate arm, then the exhaust will take the path of least resistance out the exhaust. I'm guessing that not all the exhaust will pass through the wastegate in this situation, so some of it will end up going through the turbo, but probably not enough to build boost.

 

I absolutely agree. Perhaps slower, the air flow is non existent and the rpm can't just rev fast and high. It is a experienece that everyone should experience, it is very weird. The 4g63 is like a engine that likes to rev high when mate to the turbo, take the turbo away and the engine takes forever to rev.

Carlos

 

Your explanation is bullseye, I am still inclined to believe that due to the massive air leak through the wastegate there is no enough back pressure to keep flowing and despite having some flow going through the turbo it is simply not strong enough to generate boost.

Carlos

 

8.8:1 compression with 0 boost, ~3300lbs and AWD? Yeahhh much slower. lol.