Buidling boost with open WG
#1
Buidling boost with open WG
For baseline tune purposes left the wastegate arm unhooked.... no boost till like 5k... then 5.8k or 6k or so boost suddenly builds really fast... this is a h1e/c holset on a 2.5l.... is this just because the internal gate is too small or what? just curious. I'm worried then that it will build like 30# when I only wanted 17 if the gate is too small... but I dont get how it could be! They run 17-23 stock.
#2
Re: Buidling boost with open WG
Originally Posted by ichbinsobose
For baseline tune purposes left the wastegate arm unhooked.... no boost till like 5k... then 5.8k or 6k or so boost suddenly builds really fast... this is a h1e/c holset on a 2.5l.... is this just because the internal gate is too small or what? just curious. I'm worried then that it will build like 30# when I only wanted 17 if the gate is too small... but I dont get how it could be! They run 17-23 stock.
#5
Re: Buidling boost with open WG
The wastegate on the holset turbo is not meant to regulate boost pressure like normal gasoline t3's are. The holset flapper is small and doesnt open very far because its used more or less to keep egt's in line on the cummins engine. It will work for regulating boost pressure but only so much. Thats why all the holsets you'll see on honda's either run external wg's or use the bullseye power turbine housing.
#6
Re: Buidling boost with open WG
Originally Posted by daubleaaron
The wastegate on the holset turbo is not meant to regulate boost pressure like normal gasoline t3's are. The holset flapper is small and doesnt open very far because its used more or less to keep egt's in line on the cummins engine. It will work for regulating boost pressure but only so much. Thats why all the holsets you'll see on honda's either run external wg's or use the bullseye power turbine housing.
#8
Re: Buidling boost with open WG
port that wastegate hole out... since its designed to regulate at 20+psi, its not gonna have to flow as much as if you wanted it to regulate it to 10psi, port that ---- out as much as possible... IIRC on my HY-35 the hole for the internal gate was tiny as ----.
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