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Discussion Starter #1 (Edited)
First off my truck is a '98 5spd manual 24v with DDIII injectors and a PMax Competition from TST.

My truck originally had an HX35 factory turbo that seemed to run really well but I was pushing it to around 50psi of boost. It lasted for around 110,000 miles before it started rubbing on the housing and I had it replaced. The diesel shop I went to suggested a Super 40 with a 16cm housing and that's what I got. The turbo sticker says it is an HX-40 so I don't know what the Super means.

The new turbo runs ok but it is wastegated to 36 psi because I didn't want to tear it up. The problem is that this turbo doesn't seem to spool up nearly as well which means that I am constantly driving around without much or any boost and leaving trails of smoke where I didn't before. Even if I am very easy on the go pedal it smokes. Then if I really get onto it and have the engine up around 2500 RPM it still smokes like crazy.

What I am trying to say is that I really don't see any improvements over the HX35 I had. This one doesn't even seem to run noticeably cooler! Would a 14cm exhaust housing help me out?

Keith
 

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it doesn't spool cause you've got a 16cm housing on it, what makes it super is they probably have a HX 35 shaft in it cause from what I remember they are better shafts....First off I'm gonna say you need some timeing all you're throwing at that engine is fuel TST and Injectors...you should prob stack the TST with some sort of a timing box...Smarty or something of the like! a 14cm housing would help you spool it faster and the only place you're gonna see much cooler temps with the 16cm as apposed to your old HX35 is far top end...so I say throw some timing in and go with the 14cm housing you'll be rockin'
 

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I agree. Get a 14 housing and some timing and you'll be good to go. An EZ stacks really well with a TST and can be found pretty cheap used. A smarty stacks great with it as well and can be found for a decent price used.
 

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Other than his low dyno numbers Tyler knows what he's talking about, and since he agrees with me I know I did something right!
 

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Discussion Starter #5
Ok. That is what I was thinking and also what a friend agreed with me on as well. It is my daily driver and I use it to pull a car trailer sometimes but generally I just like to have the extra power to play around with.

Keith
 

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I personally wouldn't have chosen a super 40 (old technology) but it's a good turbo as long as you keep the boost at 40psi and don't bark it to much.
 

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Discussion Starter #7
I also have a 3 piece ATS manifold if that makes any difference.

I have never heard the turbo bark even on my HX35 that was running 50 psi of boost. I have always tried to listen for it so either it isn't doing it or it is much quieter than I expect and I am not hearing it.

Keith
 

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Barking happens when your at full boost and let off the throttle real quick. You'll know it the second that it does it. It sounds like a wooof woof.
 

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I also have a 3 piece ATS manifold if that makes any difference.

I have never heard the turbo bark even on my HX35 that was running 50 psi of boost. I have always tried to listen for it so either it isn't doing it or it is much quieter than I expect and I am not hearing it.

Keith
50 PSI out of an HX35???!!! I thought these things had a tendancy explode after 45PSI??:thud:
 

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Discussion Starter #10
Maybe I was lucky. I only used it up to those pressures racing around on the street, not pulling a load or anything. It lasted me that way up to 110,000 miles.

Anyone know a good source for a 14cm wastegated HX-40 housing?

Keith
 

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Discussion Starter #12
Wow that is steep!

How would I find out which wheel I have? Do I have to pull the housing?
 
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