The help posted so far is good (except for the recommendation to sell it if you want to DD it...I DD an HX35), but it seems as though you need to do some reading up on how to go about maintaining and modifying your car before slapping on a bigger turbo. You need to be aware of the necessary supporting mods. You need to be able to monitor the air/fuel ratio and boost pressure, and you need to have some sort of way to control fuel and timing. Additionally you should have a datalogger to log all of this.
Here's a really good starting point for learning EVERYTHING you need to know about DSMs. Note that some of the pages at the VFAQ are down. If this is the case, copy the LINK LOCATION for that page (not just the URL at the top of the page, b/c the VFAQ is in frames. To get the original url of the missing page, you have to right click and "copy link location", or open the link in a new tab or new window). Once you have the URL, go to
http://www.archive.org and type the URL into the "wayback machine" search. You should be able to find the old pages there.
Sorry if that sounded complicated. Here are the links, with the most important ones at the top:
(browse the categories)
Here's an absolute minimum list of what I think you will NEED to get to be able to install the turbo (this will be somewhat redundant):
- Front Mount Intercooler (FMIC) and piping. The 90 degree bend welded to the compressor outlet that has the coupler on it is designed for FMIC piping rather than stock side mount IC piping. You could have the turbo modified to have the outlet point towards the SMIC if you wanted, but you'll be needing a FMIC anyways for when you turn up the boost so you might as well get it now.
- After market O2 housing with provision for an external wastegate (because the internal waste gate was removed from the turbo)
- External wastegate (which can be bought with an O2 housing like Wally posted). Be *SURE* you order springs that will open the wastegate at STOCK boost pressure until you have bigger injectors and fuel control. I'm actually not sure how much PSI is safe to run on a 20g with stock injectors so maybe someone else can chime in here.
- Miscellaneous hardware like new crush washers for the oil and water lines, as well as turbo gaskets
- Boost gauge - you HAVE to see how much boost pressure you're making so you don't blow things up. I suppose you could rely on the wastegate to open with the proper spring pressure, but you won't really know how much pressure you're making.
Here's a list of what I think you SHOULD GET as soon as possible after installing the turbo
- Wideband air/fuel sensor with display. Air/fuel ratio is the most important thing to monitor to keep from blowing your engine up. I recommend Zeitronix for this but there are other choices out there. With zeitronix you can add a MAP sensor which will display boost too so you don't need to get a boost gauge. You can add a bunch of other sensors too.
- Engine management. You need to be able to control fuel and spark to turn up the boost. The most popular solution is DSMLink, but again there are other options out there. Some engine management solutions come with a datalogger. If you buy one that doesn't you should get a datalogger too.
- Bigger fuel injectors and fuel pump. These are necessary to supply more fuel when turning up the boost.
- Aftermarket intake/exhaust to be able to flow the air that the turbo will be pumping.
- Last, but not least, a boost controller. Most people want to install this first, but you really have to have fuel/timing control and datalogging capabilities along with a wideband to turn up the boost safely.
Also, if you check out the stickies in the tech section, there's a link to factory service manuals. These will have all the info you need for maintenance and installs.
