Originally Posted by marks73ta
Jeff what's your thoughts on the HY 35s? If I build my 370 I might use those for it. Mark L
lots of info here Mark
Post #9 has the hy35 from 2003-2004.5 map hy and hx35's other years will be different.
The entire thread is quite long but a good read. I say a very good match for a pair on a 370 but head choice and rpm range can alter needs quite a bit. I'm scrapping my 360 inch plan and going forward with my 59 389 at 400 ci(maybe 406) Initially I have barons old Rotomaster E flow rajays but I think the Holsets may be my choice if I dont buy new turbos.
The 2003-2004.5 hy35 on a 5.9(359) Cummins spools to 32 psi by 2200 rpm as a single turbo. Two would take @4400 rpm to spool there on the same motor.
Diesel exhaust is much colder so on a gas motor they would be able spool to that psi far sooner. I'd run a suitably sized balance tube between them with a large gate on it to keep things in check and tweak the stock integral gates as a fail safe maybe a psi(maybe equal) more over the single gate. (split the single gates exhaust as well). It doesnt have to be that complicated just sayin how I would do it. Taking boost down off the balance pipe may also avoid turbine housing "choke"(if any) at higher rpm.