Hit dat turbo button DAWG!! lol seriously though

Ok so here goes, I got this idea while in the shower .
Keep in mind this idea is based on logic and my understandings, i post it up so you guys can fill in with any info that i left out of my knowledge and understandings. Dare to consider! Remember if my "ways" don’t "Work" out that doesn’t mean that the idea is a failure.

So some one sarcastically said in a thread that they would even turn the turbo off when they didn’t want them. So I got to thinking.

What if you could totally bypass the turbo/s,
I was thinking you could have two electronic cut out valves, one in between the headers and exhaust inlet pipe for the turbo, then the other in-between the throttle body and the boost pipe.

When the exhaust cut out was open the exhaust gases would circulate through the turbine then out of the turbo, into the down pipe and out the tailpipes. When it was closed the exhaust from the headers would then enter a pipe that spliced into the down pipe thus bypassing the turbo.

Now when the intake cutout was open it would just complete the connection between the boost pipe and throttle body. When it was closed it would lead to a air filter so the engine could breath when the turbo was bypassed.
The mass air meter would need to be in between the throttle body and intake cut out so it would measure in both forms of operation.

This would only work on an engine that is not built around the turbo. one with like a 9:1 compression ratio so it could run both under boost and N/A.
It couldn’t have to big of induction path "I.e. heads/intake". This idea would be for something like a stock or mildly built engine.

The only problem i have run across is the air fuel ratio.
Switching from artificial atmosphere to Natural aspiration would pose problems with the engine running rich or lean depending if your injectors, fuel presser is set up for Boost or N/a.
The fuel system would somehow have to be a compromise "as the rest of the engine would be" Between running low to medium levels of boost and running N/A.
Obviously the stock computer would not do the trick so to maximize performance in both forms of operation and make the car drivable the engine management would need to be able to switch between two different mild tunes, one For Boost and one for N/A.

So there is my idea.
Is It practical? Maybe.
Is it cool? **** YEAH!
Is it expensive? Probably.
Can it work?? I believe so!! :flag:

I don’t give a **** how much money it might cost or how much more power you could make with something else or how practical it is.
I ask that you guys give me your input on how to make something like this work and to point out ANY flaws in my thinking and any technical data.

So some punk runs up to your car and says "YO Dawg is dat Button Fo Da NOS??"
Your answer
"No, Bitch that’s the boost button" :banana:
 
IF you have a dial-a-boost unti (real product) you can dial out boost to zero psi boost and the engine will run like it has no boost. No special valves or inlet routing needed. Bascially it dumps the boost out the blow off valve.

Early 80's Porsches had turbos that dumped excess boost into the exhuast right after the turbo outlet so you never heard it dump the boost.
 
Only thing to consider that I didn't mention is a the tune. The computer would need a tune or something to let it know the correct ammount of air was goign tothe engine so it didn't dump a ton of fuel into the chambers killing fuel economy.

Actually might not need that. Under ligth throttle turbos don't make much if any boost and the computer somehow knows this and adjusts. :shrug:

I'm not a turbo guy, but I know a little bit about it. Not sure on this part.
 
If you dont load up a factory'ish turbo'ed car, the boost is very very low. My saab 9000 barely boosted at all since I drove it in high rpm "by gear" than low rpm "by load". A low boost situation is just as good as a turbo bypassed car trying to wheeze by on a bypass with an air filter at the end. Simpler system=less parts to fail=better survivability=superior system.

When presented with 2 choices, take the one with less switches, relays, computer chips, sensors and actuators.

Just tune the thing right and you'll get good milage. No need to bypass.
 
tjm73 said:
IF you have a dial-a-boost unti (real product) you can dial out boost to zero psi boost and the engine will run like it has no boost. No special valves or inlet routing needed. Bascially it dumps the boost out the blow off valve.

Early 80's Porsches had turbos that dumped excess boost into the exhuast right after the turbo outlet so you never heard it dump the boost.


its dumped through a waste gate. blow off valves just let a little out to prevent damaging the TB when it closes, such as during shifting.