1G What wastegate pressure for 16G

Bumbax · Apr 8, 2022

hi guys, i would like to buy a 16g turbo, to mount it on my talon tsi 1g (1991).
The seller has several options for the wastegate, what pressure do you recommend? considering that I would mount it on an engine that has not been internally modified...

AWD-Tony · Apr 8, 2022

The lowest boost you will run. Factory is 8lb spring iirc. You don't need to worry about internals for a 16g. It will handle anything a 16g can throw at it.

Bumbax · Apr 8, 2022

TK's9d2TSi said:
The lowest boost you will run. Factory is 8lb spring iirc. You don't need to worry about internals for a 16g. It will handle anything a 16g can throw at it.

Thanks, how much bar are 8lb? 0.5?

This are the seller options:

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AWD-Tony · Apr 8, 2022

1 bar is 14.5 psi. I would grab a .8 bar

Bumbax · Apr 8, 2022

TK's9d2TSi said:
1 bar is 14.5 psi. I would grab a .8 bar

Ok thanks a lot!

JusMX141 · Apr 12, 2022

OEM = 0.8 bar, but it ultimately depends on what you plan on doing with the turbo. There are a ton of variants like turbine backpressure and wastegate hole / flapper size that ultimately determine the base and peak holding pressure of any internal wastegate system, so even a 1.5-bar actuator may have a base boost pressure between 15psi and 18psi despite the spring cracking pressure being close to 22psi.

Also, this actuator selection is typically only something I've seen offered by some of the Chinese or Taiwan distributors. A word of caution- those units aren't what they're cracked up to be.

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1990TSIAWDTALON · Apr 12, 2022

Please correct me if I am wrong, but don't MAP sensors also include the vacuum as part of the "Bar" rating? I may be wrong, no doubt, but I was thinking a 4 Bar would measure up to 14.5 x 3 = 43.5 because it considers one of the "Bars" as the inches of vacuum or negative pressure. Is this wrong? I was reading on a Fiero website and came across THIS article. I don't want to give out mis-information so anybody that can clarify this, it would be good for everyone.
Thanks!
Marty

steve · Apr 12, 2022

1990TSIAWDTALON said:
Please correct me if I am wrong, but don't MAP sensors also include the vacuum as part of the "Bar" rating?

I think your referring to the difference between Gauge and Absolute pressure measurements and MAP sensors are by name Manifold Absolute Pressure Sensor. They measure from absolute vacuum (or as close as possible) so a 4 bar range sensor measures from 0-4 bar or up to 3 bar over atmospheric pressure.

The typical wastegates are going to all be psig values just like a tire.

Difference Between Gauge and Absolute Pressure Measurement

Pressure is as the force applied to an area. There are two common different systems of pressure measurement, absolute pressure and sealed gauge pressure

www.esi-tec.com

Function of the manifold pressure (MAP) sensor

The Manifold Pressure Sensor is used in an engine's electronic control system. Engines that use a pressure sensor are typically fuel injected...

www.delphiautoparts.com

Making sense of your sensors: MAP sensor

Typically found in fuel injected engines, the manifold absolute pressure (MAP) sensor is one of the sensors an engine control module (ECM) uses to calculate fuel injection for optimal air-fuel ratio by continuously monitoring intake manifold pressure information

www.delphiautoparts.com

MAP sensor - Wikipedia

en.wikipedia.org

1990TSIAWDTALON · Apr 12, 2022

Thanks for the clarification Steve! :thumb:

I would hate to be giving out bad info.

Bumbax · Apr 12, 2022

JusMX141 said:
OEM = 0.8 bar, but it ultimately depends on what you plan on doing with the turbo. There are a ton of variants like turbine backpressure and wastegate hole / flapper size that ultimately determine the base and peak holding pressure of any internal wastegate system, so even a 1.5-bar actuator may have a base boost pressure between 15psi and 18psi despite the spring cracking pressure being close to 22psi.

Also, this actuator selection is typically only something I've seen offered by some of the Chinese or Taiwan distributors. A word of caution- those units aren't what they're cracked up to be.

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it's a kinugawa, I don't think it's "gold" but not crap either

AWD-Tony · Apr 12, 2022

Bumbax said:
it's a kinugawa, I don't think it's "gold" but not crap either

I have used that wg before. It’s good quality imo.

Sirius1995 · Apr 12, 2022

so on stock 4g63t 0.8bar with 16g upgrade, correct?

ist dwa · Apr 12, 2022

I'd use the 1 bar spring IMO, Why on earth would you ever want to run less than 15psi on a 16g? Wastegaste spring pressure should be 1/2 what your total boost is going to be. So a 16G is good for around 28 psi divided by 2 = 14. You are welcome.

Bumbax · Apr 14, 2022

already arrived! they are very fast, let's hope it goes well, I have a lot of work to do first, I will have to wait before mounting it

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1G What wastegate pressure for 16G

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Bumbax

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1990TSIAWDTALON

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Difference Between Gauge and Absolute Pressure Measurement

Function of the manifold pressure (MAP) sensor

Making sense of your sensors: MAP sensor

MAP sensor - Wikipedia

1990TSIAWDTALON

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Sirius1995

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