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Old 05-24-2012, 05:54 AM   #31
EnJoIthaReX
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Well my only dilemma is, I have a long tube header now. So with FSWerks I would have to purchase a turbo manifold.
If you want to turbo you have to purchase a manifold period. FSwerks or whatever. Unless you want to use the stock zetec manifold.
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Old 05-24-2012, 05:57 AM   #32
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I have a top speed kit with an fswerks tune
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Old 05-24-2012, 06:12 AM   #33
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If you want to turbo you have to purchase a manifold period. FSwerks or whatever. Unless you want to use the stock zetec manifold.
My point is that the top speed comes with a manifold and fswerks does not.
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Old 05-24-2012, 06:18 AM   #34
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Psi doesn't matter. It's CFM that matters. 10 psi from a turbo the size of a T88 would probably blow your motor. 10 psi from the size of a t25 you could run on a stock block.

Figure out how big you want your turbo. Then do things like a compression check and a leak down to give you an idea of the condition of your motor. From the readiing I've been doing its hard to say how much power the stock block can hold. It seems like everyone overbuilds their car. But I think I have read maybe around 300hp is probably the max for a stock block zetec.

But doesn't the turbine push a certain psi based on wastegate springs? In return only pushes a certain CFM correct?
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Old 05-24-2012, 07:27 AM   #35
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My point is that the top speed comes with a manifold and fswerks does not.
Fswerks uses the factory manifold and just uses and adapter to go from 3 bolt to 4 bolt


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Old 05-24-2012, 07:39 AM   #36
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Well my only dilemma is, I have a long tube header now. So with FSWerks I would have to purchase a turbo manifold.

Therefore, the top speed is becoming more appealing.
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Old 05-24-2012, 08:03 AM   #37
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Or get a cheap stock one from a junk har or I'm sure someone on here would give one away to you very easy to come by. I actually just threw one out last month lol
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Old 05-24-2012, 08:29 AM   #38
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Yea that's a possibility
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Old 05-24-2012, 11:16 AM   #39
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But doesn't the turbine push a certain psi based on wastegate springs? In return only pushes a certain CFM correct?
The term "PSI" is a measurement of restriction. One turbo may have to spin much faster than another to obtain a the same psi. If you're running a certain turbo passed it's efficiency range, you're only heating up the exhaust gasses/intake charge and losing hp. This is why you compare compressor maps to see what is the best size turbo for you.

Remember 10psi is 10psi. The increase in power is achieved by a cooler/denser intake charge. More air molecules can occupy the same space with a lower temp. Not only this but a larger turbo will help to reduce back pressure which will increase your overall VE of the engine.

The CFM rating is not dictated by the turbo, but instead by the displacement of the engine and the rpms you're at. That is a constant unless you change something in the system.
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Old 05-24-2012, 12:23 PM   #40
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Originally Posted by amoosenamedhank View Post

The CFM rating is not dictated by the turbo, but instead by the displacement of the engine and the rpms you're at. That is a constant unless you change something in the system.
This is not accurately stated. The CFM most certainly is dictated by the turbo, by both the turbine side and the compressor side.
A small turbine housing will restrict flow, and a small compressor will restrict flow.
There is too much over-simplification in your explanation and the original poster needs to do far more reading on their own rather than expect to get all the answers here by non-professionals, including myself.
Go to the Garrett website and read everything before accepting anything you read here as fact.

EDIT: I'll add that I recommend not buying a single piece of your turbo kit until you can read, understand, and plot points on a compressor map relative to your power goals.
If you don't want to do any of this, then just buy a pre-made kit from a company that has done all the research already.
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