Hx 55? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 04-14-2009, 11:06 PM Thread Starter
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Hx 55?

What, if anything do you guys know about the Holset HX 55? There is a guy close to me selling one for $200. I dont know to much about turbos. Is that big enough to make a set of towing twins if combined with my stock HX 35? Any info is appreciated! Thanks guys.

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post #2 of 10 (permalink) Old 04-14-2009, 11:31 PM
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That is a prety good size bottom turbo.. I would atleast do ahx40 or s300 to spool it....

Jordan

95-dodge 2500 built to the hill... - sold to litle brother
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post #3 of 10 (permalink) Old 04-14-2009, 11:34 PM Thread Starter
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Quote:
Originally Posted by blackcloudCTD95 View Post
That is a prety good size bottom turbo.. I would atleast do ahx40 or s300 to spool it....
Well, heres the deal...If it will work with what I have, I think I'll buy it and build a kit, but I dont want to have to buy another turbo, ya know...

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post #4 of 10 (permalink) Old 04-15-2009, 01:38 AM
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Hx55 will work just fine under a stock turbo. It is very similar to the h2e that I am running. You will want injectors though and as large a housing as you can find for the exhaust side of things. With stock injectors, that set up will be a dog to get spooled. I would suggest running at least a 100hp injector.

With my set up, hx35/h2e with a 38mm external wastegate on the hx35, I can't break 1100* with my 110's and the drag comp cranked all the way up. Also, with a re-torque on the head bolts, you should be fine for boost.
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post #5 of 10 (permalink) Old 04-15-2009, 03:54 PM Thread Starter
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The other question I have is the guy said it has a bit of shaft play. He claims it would work fine, but recommends a rebuild. What would I be looking at price wise for something like that, and can I do it myself? And the real kicker, is it worth the $200 to get it if in fact it needs rebuilt? Thanks.

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post #6 of 10 (permalink) Old 04-15-2009, 04:10 PM
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Rebuild kit will run you about $100. As for it being something you can do yourself. That depends on how well equipped/machanically inclined you are. I've never rebuilt a turbo, so I can't tell you what all it takes. But it shouldn't require any machining if it isn't too worn. also the shaft play that you are worried about is a end to end. Even my brandnew H2E had a little bit of play in it.

Here is a link for purchasing a rebuild kit.
http://www.gpopshop.com/holsetkits.html

Also, keep in mind that the hx55 may use a T4i flange instead of the t4 so flanges can be a little harder to come by.

T4i-2.75"x3.5"
T4-2.75"x3.25"

Flanges are available but they are hard to find, and I have only found them in 3/8" cnc'd plate, and I prefer to use at least 1/2" plate, many people use 3/4" which would work as well.

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post #7 of 10 (permalink) Old 04-15-2009, 04:36 PM Thread Starter
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Here is the post of the HX55. He gives some specs on it...Sean, is that what I'm looking for?

"Used HX55 with a little shaft play. Could probably be used as is, but I would rebuild it for good measure. Spins free and the fins are in pretty good shape.

Would be great upgrade for a dodge cummins, honda, or mustang. I was going to use it to turbo my mustang, but now I am going a different route. Excellent for custom turbo apps due to not have an internal wastegate that would need to be blocked off anyway. This turbo can put out pretty good horsepower numbers. The numbers I found are approximately 1230cfm which could support 990hp on gas or 735hp on diesel, in theory. Another source rated it at 1050cfm. In any case, it should have at least 1000cfm.

Air inlet size: 4"
Compressor out: 3"
Exhaust outlet: 3.5" pipe, 4.75" flange

Price of $200 is slightly negotiable. Will consider all trades."

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post #8 of 10 (permalink) Old 04-15-2009, 11:35 PM
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Yeah, they are really a bit closer to 1050cfm, however, cfm isn't a great way to compare turbos because there are a bunch of different factors that play a part in air density. Pushing 700hp out of this turbo is a little unrealistic, but it should make a fine bottom charger for anything in the 450-550hp range. One thing to also keep in mind, that exhaust outlet is probably actually 4 9/16" and will work with a 4" pipe. However, the Vband clamp and flange to mate up to it are probably going to run you nearly $150, they are very pricey little suckers.

I had a lot of people try to push me away from the H2e in my twins, because it was "too small" at roughly 64mm inducer. And conventionally speaking, it is pretty small for the bottom charger in a set of twins. The hx55 is a little bigger, roughly 67mm and (I think should be directly interchangeable with my set up). I have no issues with mine, and it will actually allow for quite a bit more fuel, I have some 200's to throw at and see how it does.

So my opinion is, that it will work fine unless you are shooting for numbers higher than about 550. The stock turbo will limit pretty much any set of twins to around that range in hp. However, the hx55 won't flow enough to support a larger turbo up top so that is your limiting factor.
Sean

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post #9 of 10 (permalink) Old 04-16-2009, 05:27 AM Thread Starter
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Sean, thanks so much for all the info! Yea, I'm not looking for crazy HP numbers at all. My main goal is to have fun with a build like this, and make it a little easier on my truck to tug around our bobcats. I have nearly 270,000mi. on the truck, and want it to last MUCH longer, so reliability is key. From what I understand from your posts, reliability should not be an issue if I go with a conservative set of injectors with the compound set up, and don't try and push crazy boost numbers. Is that the gist of it?

Thanks again...

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post #10 of 10 (permalink) Old 04-16-2009, 08:00 PM
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Yep, if you take the precautionary steps of at least re-torquing your headstuds, with a set of compounds that small you shouldn't have any issues with reliability at all. The main issue I see after that, is that your trans won't like it. Also, if you do the sticks at the same time that you do the twins, you won't feel like you lost any spool up. You will have a little bit more smoke down low when the box is cranked up, but that will clear up quickly.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
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