(03-11-2014, 11:20 AM)mike-81-240d From what I've read over on DSM and Evo forums they all switched to Holset HX35's from Precision turbos. Something to do with the internal design of holset turbos allowing for noticeably quicker spooling versus their previous precision and Garrett turbos of the same size.

(03-11-2014, 11:49 AM)Duncansport

(03-11-2014, 11:20 AM)mike-81-240d From what I've read over on DSM and Evo forums they all switched to Holset HX35's from Precision turbos. Something to do with the internal design of holset turbos allowing for noticeably quicker spooling versus their previous precision and Garrett turbos of the same size.

So i've noticed. Also there is a great write up from http://www.turbodirect.co.za/site/index.php?option=com_content&view=article&id=778&Itemid=21.

I may settle on the HE351cw and ditch my Big H1C. I really like the BorgWarner EFR turbos as they have a lot to offer at a reasonable cost.

(03-12-2014, 09:07 AM)EDH_Performance

(03-11-2014, 11:49 AM)Duncansport

(03-11-2014, 11:20 AM)mike-81-240d From what I've read over on DSM and Evo forums they all switched to Holset HX35's from Precision turbos. Something to do with the internal design of holset turbos allowing for noticeably quicker spooling versus their previous precision and Garrett turbos of the same size.

So i've noticed. Also there is a great write up from http://www.turbodirect.co.za/site/index.php?option=com_content&view=article&id=778&Itemid=21.

I may settle on the HE351cw and ditch my Big H1C. I really like the BorgWarner EFR turbos as they have a lot to offer at a reasonable cost.

Anything is better than the old h1c How high is your hp target?
We have now an hx30 with 50/78mm compwheel

(03-12-2014, 01:57 PM)Alcaid Build a proper twin scroll manifold with seperate external wastegates for each runner and be surprised

(03-12-2014, 01:57 PM)Alcaid 350-375bhp would be 50-55lbs/min

The Holset 78/54mm comp wheel flows 56lbs/min
The Holset 78/56mm comp wheel flows 60lbs/min

HY35 turbine is too small to flow this amount so HX35 turbine is needed. Build a proper twin scroll manifold with seperate external wastegates for each runner and be surprised

78/56mm comp wheel never came in the HX35/HE300 series turbos but it can be made. I have billet wheels in stock and custom compressor housings on the way to build these

(03-13-2014, 03:44 AM)erling66 Twin scroll on a 605? How are you gonna do that? or maybe you forgot that it is one of those strange 5 cyl engines

(03-13-2014, 06:51 AM)Duncansport The HX35 and my Big H1C use the same turbine wheel (same part number even), i also am using a .63 A.R housing. So going to an HX35 seems a bit of a lateral move. I do think the compressor of the H1C is of an old design, but it's not far off from the HX35's wheel. Also it does not have the MWE groove cut in it, but that would be easy to do on the lathe. I like everyone in the world would like the the shortest time to boost threshold.. My mind keeps wanting to think he compound route is the best answer, but i think it would turn into a huge mess that wasn't reliable. Therefore a modern turbo and good gas flow is the answer.
F.R.A.S. is offered a nice piece at a very reasonable price, that may just be my route for a manifold.

(03-14-2014, 08:57 PM)Gearbound What about a hx35/40 hybrid? the he351 W/G will be my next move. Precision 6566 and others do great on the 3.0 supras. another turbo with bang for buck is the s300 Borg warners. Id like to see a s366 .91A/r on a 606 it maybe a bit laggy on 605. The borg warner S series likes to whistle.