Minor Threat

Turbo that big is also out of it's peak efficiency range at only 7psi on a B16. Talk to J. Davis about Holset turbos, he knows his ---- about 'em.

EDIT: Looky, a big thread on Holsets, with maps. I know you're running an HY35, and there's no map in the thread, at least for the pages I've seen so far, but my guess is 7psi is still gonna be a ways out of the efficiency rating.

http://208.186.78.102/forums/showthr...1&page=1&pp=25

Jays91DXhatch

From what I hear, you need to be in the 15psi range to be in the effeciency island on these turbo's.

So bumping up the boost would help with lag.

topspeed

is it loud when it spools up? you should post a video.

model x

Ya its pretty loud when it spools, it had a silencer ring in it, but it was only held in with a snap ring. Sounds like a Mack truck. I love it. In car vid coming soon.

Ya I need a mbc so I can crank up the boost. But 15 psi, yikes, that might be a little high for stock pistons. I'll go 10psi and see what that makes. I'm still running the stock clutch

The HY35 only came on automatic '01 trucks. They're supposed to spool a tiny bit quicker than the HX35.

topspeed

ya ---- that silencer ---- haha if i could make my turbo louder i would haha its the best sound.

sohc_mshue

I don't understand why you would run a turbo that big on a stock block...you'll be pushing your motor to its limits trying to get in that turbo's efficiency range.

Tom-Guy

What does "15 psi" and stock pistons have to do with anything? Either you are controlling combustion temps in the chamber, or you aren't, and your engine lives or dies accordingly. Well, make up your mind about what you care to do, and leave "15 psi" and "stock pistons" out of the discussion.

I doubt you are making 200 whp at 7 psi. I doubt you are doing any better than Hoggy did at 7 psi with his HX35 on a B16 - 160-180 whp or so. Once you get to 1.5 pressure ratio you'll hit the GT-equivalent efficiency and air flow to charge temps will be more in line with what you're thinking of when you compare the HY35 to an SC61 - the Holset should be a little better than the SC61 in that range, just like the SC61 is a single digit psi monster on the GSR.

FYI, to go offtopic, if you run a split turbine setup like the HX35 and want a LOT faster spool, do like the tractor pull guys and block off one of the turbine ports. You can also get a modestly faster spool from pairing up your cylinders and feeding them seperately into the split turbine, like you're supposed to. Your hp-per-psi-which-has-nothing-to-do-with-anything numbers will dissappoint every last HT poster [color=Pink]EVAR, but you will have more cylinder scavenging and less thermal mass held trapped inside your engine than the other Honduh boys, and if you have to run "7 more psi" to make "the same power" the heat trapped in/detonation potential of your engine will be less hp for hp - but who really cares if I can make more power more safely with "more psi?"

Anyway, I digress. I am ASSUming that the HY35 can be fitted with a smaller turbine housing if the spool is killing you - B16 is peaky, but you gotta be able to drive it - Jaymez at Diesel Injection in Cincy can probably hook it up for you.


I think Brood on HT eclipses my knowledge by a good bit, and Mark Pikas is who you turn to for the larger chassis HX40-80 sized stuff. When you don't break down and call Jaymez at Diesel Injection Service like a good little bitch - I do.

I can tell you that the DSM forum you linked to - while it had good tech - was diluted by DSMtards talking out of their asses. HY35 is 9 cm^2 turbine housing, not 12, the 94-03 HX35W was 12 cm^2. HY35W was made in the 90's, btw. HY35 compressor is *not* HX35 compressor - there is a difference of 3-4 lbs of air peak, and the posted up charts on the first page reflect that.

twisted civic

lookin good shane, I started installing my stuff the other day, I'll drop by the shop when i'm done, colin said yours was sick above 5500rpm, good job man.

gt350

Tom-Guy

GT350, sounds about right, but they made the HX35 until 02 or 03. After that, the Cummins B5.9 got an HX40.

FYI, htturbo.com has a hot swappable HX40 compressor wheel + housing for $200, for when you absolutely need 700 to the wheel in a gas application...