Thread: Turbo And Supercharger?

Why is it when you run a turbo kit you have to gut the supercharger? If this a "must" or do people just do it?

not really worth the extra strain... The SC is only offering you a benefit for a few milliseconds about 2 or 3 times each time you drive it.

Originally Posted by txslow6

Its not a must to gut the S/C however you will make more power on a turbo alone than you will twincharged.

And drunkiethebear have you actually tuned a twincharged engine or are you just spouting off something you read someone else say even though they weren't twincharged?

The guys who have a twincharged setup say its not as bad as people make it out to be.

I have heard that the twincharge is a great setup was just wondering why people don't seem to do it more. I think the rumor of the difficulty is far worse than the actual process itself.

@darkhorizon: My charger pully was broke for a while and the 3.8 spec engine without a supercharger is a lot slower so to say the supercharger only helps you a little is not at all accurate. The 3.8 without the S/C makes more power than the 3.8 with the S/C but not using it. Don t forget they reduce the compression on these engines so to compare a GP GT to a GTP without a S/C isnt a very good way to do it.

Originally Posted by KeithGTP03

I think the op was asking if you were just gonna run a turbo. They gut it so the impellers dont block the air flow.

Not what i was asking but this did answer another question of mine so thanks mate

The "twincharged" setup is fine in theory... the blower "turns off" when the turbo equals out the pressure above and below the rotors... All "proper" twincharged setups use a bypass valve that ensures that pressure stays balanced above and below the blower.

The blower turns into a fancy looking blender after your turbo starts making the boost... Does it increase volumetric efficency at this point? Probably, but is it worth the 10-15 horsepower to spin the blender... I would say no.

Having owned, built, and driven just about every setup out there... The fact that a turbo has some lag gives your tires some small chance of not melting off at 80mph.... Having a bit more power earlier is probably going to make you slower in most situations.

without a supercharger is a lot slower so

Apples and oranges here... N/A without any sort of intake manifold design is going to destroy wide open power... not to mention the motor has to spin the SC rotors with vacuum..... When you are putting 17psi from a turbo into a twincharged setup, or a regular turbo setup... the "non twin charged" will always make more power to the ground.

I know its already been said but the supercharger will actually restrict the turbo.

That is completely false. The SC increases VE due to the fact that the blower is a displacement blower, not a compressor.

Originally Posted by gtpsleeper

ya but if the turbo is pushing in more air, quicker than the supercharger, wouldn the supercharger restrict the air from the turbo because it cant "keep up" with it?

Its positive displacement... The blower doesnt move a specific mass of air, it moves volume (displacement). Turbo's operate on mass airflow, and displacement blowers work on the amount of space the air takes up. This is why a positive displacement blower only has one metric that determines efficency, and that is pressure ratio above and below the rotors... which is irrelivant to atmospheric numbers if you are putting 2bar worth of air into the top, and 2.5 bar is cooming out the bottom... you have a ratio of .5.

Now in reality, no twin setup even uses the blower under boost... so that arguement is even more pointless.

Which is why people run larger pulleys on TC setups, bruh.

Uh... you would run a smaller pulley if this was true... but it isnt even close to true.

Originally Posted by darkhorizon

Its positive displacement... The blower doesnt move a specific mass of air, it moves volume (displacement). Turbo's operate on mass airflow, and displacement blowers work on the amount of space the air takes up. This is why a positive displacement blower only has one metric that determines efficency, and that is pressure ratio above and below the rotors... which is irrelivant to atmospheric numbers if you are putting 2bar worth of air into the top, and 2.5 bar is cooming out the bottom... you have a ratio of .5.

Now in reality, no twin setup even uses the blower under boost... so that arguement is even more pointless.



Uh... you would run a smaller pulley if this was true... but it isnt even close to true.

What your saying goes in line with a few things ive heard about people doing twin setups so the supercharger is giving power when the turbo lags, and the turbo is giving power when the SC cant. Since these power adders work in total different ways to me it would make sence that to have both... you would never see any "lag"

Our base turbo kit will take a naturally aspirated 3800 from 200 to 300 HP+ non-intercooled and to 400HP+ intercooled. Adding our kit to a supercharged 3800 will net 400-700HP depending on your configuration.
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