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Joshstix
Forums Junkie

Toymods Vice President

Location:
Sydney
Registered:
May 2002

Re: 1g boost after new cooler	Fri, 17 September 2004 03:00

Real and Apparent boost, you say. The reason why this situation happens is that we are taking two pressure measurements at two different locations of the system. Your boost guage is connected to the intake manifold, this means that the air pressuring your boost guage has to make it's way through all of the restrictions in the system. The wastegate on the other hand is generally plumbed straight into the compressor housing so it measures boost before any restrictions. What does this mean? Lets say we've got a "10psi" spring in the wastegate. The wastgate will always open when the turbo is making 10 pounds of boost. Now if we have an intake tract that introduces 3psi of pressure drop then your boost guage is going to read 7psi. Reduce the restriction of the intake tract between the turbo and the plenum and you will see the boost level at the plenum increase. As to the limits of the turbines, I believe this is more to do with turbine rpm than actual pressure levels. In your situation the turbine speed at the after modification low boost setting should be roughly the same as it was on the "before modification" low boost setting. Whether you should run more boost now would be dictated by your supply of replacement turbos in my opinion. [Report message to a moderator]

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