okay, bear with me as I know what most of your responses will be on this one, but I am desperately seeking compressor and turbine maps for our little buddy the HX35. A compressor map would be stellar, but a few maps for the 12cm through 18cm would be a plus.

I've devised a variable scroll turbine housing for a large Garrett which I have maps for (and they are pefect), but before I can finish it, I want to see the flow and pressure numbers for the stocker. This will help me decide what to do with compressor wheels/housings, as well as turbine housings.

I've done some theoretical number crunching pertaining to outlet air temperatures, volumes and pressures and how the the turbo stages will either work or fight one another, and have come to a startling conclusion that way more efficiency can be had by intercooling the stages, either chemically or mechanically. There is some interesting propaganda regarding pre-turbo water injection out there. Most would think compressor wheel erosion would be a problem, but it boils down to WHERE you inject the water and at what spray angle/droplet size. Chemical intercooling such as this could raise the small turbo's efficiency range by as much as 30%, and negate the need for complex and bulky mechanical intercooling to get the big turbo's outlet air temperature down to a respectable temp prior to entering the little stuffer. Follow this by more common intake manifold water/meth injection and thee are some real impressive air numbers that result. Just a thought.

Anyway, the meat and potatoes of this post is to find those 35 maps....so any help would be greatly appreciated!!

 

You mention chemical and mechanical intercooling, but not thermoelectronic Just another angle would be to attach a peltier onto your cold pipe, but this would generate a lot of heat on the opposite side. Here's a link

http://www.tetech.com/

Can't help w/ the maps, but thought I'd throw my screwball idea in

 

I can't help you with the turbine maps, but on the holset website, you can get the compressor maps.

And by the way, you are absolutely, 100%, dead on correct about the intercooling (as in real intercooling, meaning between the compressor stages) being a massive improvement. I have also run the numbers and the results are stunning. When I do my compounds (twins, for most of the folks on here) I will be intercooling and aftercooling.... whatever the mods required to make it fit.


PS, I bet you've also figured out just how small the secondary compressor can really be if you intercool.....

KP

 

What most don't seem to understand is even if you have a nice efficient fat map on the primary, inlet air temps can be a couple of hundred degrees in the secondary!! We try so hard to get cool air to turbo inlets with various CAI kits, but throw it all out the window when we tie two compressors together without intercooling somehow, leaving the nasty job of trying to cool down 400* expanded air to the aftercooler that was never designed for it!! A primary turbo doesn't need that much kick start out of a primary providing your keeping everything else realistic down the line. I too, will be intercooling in one fashion or another that's for sure.

Thanks for the tip on the maps...never thought of looking on their site...duh.

 

I have maps on HX35 compressor side I've found in the net. I can email them over if you gimme your email addy. Feel free to PM me.

On many forums people do say "have a look at Holset web site, the maps are there". I don't know whether maps have been hidden beyond dozens of tabs and links, or have they renovated their site - and removed those maps completely. I however have not found any maps on Holset web site. Period.


Since we're on the subject, I have a question to dish out.
Does anyone know how to actually measure up Holset turbine housing?
What precise measurement is this 12cm² or 14cm² ...?

 

I failed to point out - anyone on this forum can ask the map. I'll email it over.