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Discussion Starter #1
Hey guys.

Currently will be aiming for 25 - 30 psi on my built D16z6. Currently running a Garrett Gt3040 Turbo with a tial 38mm External wastegate. Running a hondata S300 with the Hondata boost solenoid. Is there a good 'rule of thumb' ratio that should be used or not exceeded when boosting to levels this high? I have herd myths that you cannot go double the wastegate spring with the solenoid and have steady boost levels. Eg 10psi Spring with the EBC solenoid = 20psi max.

Therefor would i be better useing a 15psi spring and useing the EBC to take it out to 25 - 30 psi ? Also when useing a high spring psi will that effect the way / rate a engine will build and/or maintain boost pressure etc ?

Thanks guys

Lyle
 

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You should really still be fine with a 38mm. But you can always upgrade to a 44mm if you would like
 

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Discussion Starter #3
more specifically the spring in my wastegate. It is a 11psi spring at the moment, will this be too small, to try extend out with a EBC (hondata)
 

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38mm will be fine. Think about it. The more boost you run the less exhaust the wastegate has to bypass. You would need a bigger gate if you were trying to run like 5 psi on a turbo that spooled really early.
 

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Oh, about your spring psi question. Yeah, its a good idea not to more than double the psi level output of that of the spring in your WG. I opted with a 14 (1 bar) psi spring. I ran off WG on low boost on the street and 20-21 psi high boost off my manual/switched boost controller on the highway (only twice). 400+ whp is scary fast on the street!
 

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more specifically the spring in my wastegate. It is a 11psi spring at the moment, will this be too small, to try extend out with a EBC (hondata)
You will be fine on that spring. My gate is an 11psi spring. Thats how i street drive/pump gas race the car. Then when i switch to race fuel, it see's 30-32psi in 3rd and 4th. Also using an aem solenoid and hodata to control boost.
 

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Discussion Starter #7
Sounds good mate ^ But more to the point could i achieve boost levels of 25 - 30 psi with a 11lbs spring and a ebc? or would i be better off useing a 15lbs (1bar) spring)
 

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