Being the 1st gen newbie that I am, I must ask. (I did search but did not find the answer I was looking for.) How well would the HX35-12wg perform on my truck? I ran the stock HX3512 on my over-valved truck HARD as a daily driver (little to no towing) at 35psi and ~350rwhp for many miles with little or no apparent wear. Suprizingly I didn't have too much trouble keeping the egts in check. I could see where it would have gotten REAL toasty in a hurry towing heavy though, which I never do. I guess what I'm asking is would the performance be comparable between the two trucks given I had enough fuel? I am aware of the length difference btw wg and non-wg housings. Or does the 1st gen Cummins like the stock compressor (with HTT goodies eventually) with a 16cm non-wg turbine housing better? Would the HX3512 be enough turbo for ~300 rwhp that does not tow? I sure miss the NOW spool up of my 24v....I guess I'm trying to replicate that without too much coin involved. Sucks being poor!

By the way, you guys in Idaho watch out! I just got hired by the Idaho State Police today!!

 

Congrats on the new job and for obtaining a properly-valved truck

Simple answer, the HX-35/12 would be an awesome turbo for your truck as it sits. You're going to have to spend some more $$$ to hit 300HP regardless of turbo choice, but I think you'll find the disproportionate torque to HP of a 1st gen to be extremely fun

 

The cheapest route to go would be to buy a Stage 3 or 4 compressor from HTT and find a good used 12cm exhaust housing for instant spoolup. Then bring on the fuel

 

IMO go with the HX-35, besides turning the fuel up on my truck, its probably the best thing I've done to my truck. Near instant boost (1/2 second or less for spool up) and lots more boost to boot. I went from 18-19psi on my stock H1C to 24-25 with my HX-35, then I turned the fuel up some more and now I sit at 29psi. It just makes the truck easier to drive around town and passing people on the highway. So far I'm happy, and the sound it makes is sooo sweet!

 

agreed, your best bang for the buck is going to be spending $200-300 on a used HX35-12W and throwing it on there...

I don't understand polishing a turd like the H1C... do the HX35, pawn the H1C off on some chump on ebay for a couple bucks, and don't do any furthur turbo upgrades untill you've got the bread for a nice S300 hybrid!

 

I thought that it was recommended to use a modified W-H1C over a HX-35 for twins?

A H1C with HTT stage IV compressor housing and a 12 or 14 cm wastegated housing doesn't spool better than an HX-35?

 

my point is when it's all said and done, your'e going to have $500-800 in a turbo that isn't worth that much IMO... plus the downtime on your truck...

you'd be better off buying a good used S300 job for $1000-1200... FAR superior turbo.

I'd "live with" the HX35 for a while till you can afford a "real" turbo... it'll still be lightyears better than what's on there now

 

I was talking to the guy at HTT (Paul, maybe?) and he didnt like the HX35 in stock form any better than the H1C. Of course, he was interested in selling me a H1C upgrade, but the impression I got was that the HX wasnt that great of an upgrade. I went back to the H1C (paid for the pump rebuild with the HX35 and a 12), but kept the 14cm housing, and I have noticed little if any gain or loss of one over the other.

I guess it is in the eye of the beholder. I have way too much fuel available for my turbo, and I am just keeping my foot out of it for now. But there is a BIG difference between the 21 and 12. You literally go from one end of the scale to other.

Daniel

 

it's not that great of an upgrade, but you get a 12cm wastegated turbine housing a slightly better compressor wheel, and a MWE compressor housing... with no assembly required... and if you pay more than about $250 for an HX35-12W, I think you overpaid personally... Then throw your H1C up on ebay... if you can't get $75-100 for it, I'd be VERY surprised...

so now you're into your "upgrade" for under $200 with basicly no downtime on the truck, and no wrench time on the turbo (you ever go to bust the turbine housing off a 15yr old turbo w/ a couple hundred thousand on it? not my definition of fun)

roll with that for a while... you'll have plenty of other areas to address (converter/VB or clutch, injectors, etc.) and the HX35 will keep up pretty good... things will start getting hot, but just keep setting aside a little money and get you a nice 62mm S300 hybrid or heck, get freaky and hang an HT3B or S400 under that HX35 and have you a nice budget set of twins!

I've done the Holset HX series stuff... full 40's, hybrids (H1C and HX35 use the same turbine... basicly you're building a 35/40 hybrid) They just don't offer the spooling and cooling of the S300 based hybrids.

if I could pick up a nice 60mm hx40-16W for a few hundred, I'd run that, but otherwise, I'm done w/ the Holset HX stuff for good unless it's a cheap stocker.

 

I realize this is starting to turn into a war, but a Stage 4 wheel on an H1C will outflow, outcool, and outsound any HX-35. I like the point, I think it was forest that said it, that you're going to spend more on the H1C upgrades than on a used HX-35 that already has the 12cm housing. But, you never know what you get when you buy used turbos. I personally will never do it because I flat out don't trust people on ebay. Wannadiesel is running in the neighborhood of 350 horse on a stage 4 and a 16cm housing. An HX-35 will not support that much power. (I realize that he is still under-aired) There's hardly any differences from the H1C to the HX-35. The compressor wheel on the '35 is 2mm bigger, it has MWE slots, and the exhaust housing is smaller. These aren't big enough differences to justify a couple hundred bucks for a USED turbo. HTT's stuff obviously has MWE slots and you can pick the size of your compressor wheel. Anywho, I'm really sorry if I made anyone mad but I just thought I'd voice my opinion

 

don't buy a used turbo on ebay... buy from a DTR or TDR member... I promise you an sps62 will outflow/cool/sound a stage IV

 

just looked at the site... $325 + say $150 for a turbine housing + rebuild kit? + hassle of building the turbo = $500+ god forbid you'd go w/ a 14cm gated housing and be $700+

I'd sooner buy a used PDR40 from a board member for $600-800

and don't forget you're left with your working turbo to turn around and sell. with the right ad, getting $150-200 off ebay for an H1C isn't impossible, but I think your'e pretty much guaranteed $75-100.

do what you will, I'm just speaking from personal experience

 

What does this upgrade look like to you guys?

http://cgi.ebay.com/ebaymotors/ws/eB...2988167&rd=1,1

Is this worthwhile? It seems pretty inexpensive. I have a 92 which according to the charts has the 21 cm HC1.

 

hate to sound like a broken record, but I'd recomend doing a 35/12W instead of a 16cm on your stock turbo

 

If your H1C is in good shape and you already have the turbine housing you want, the HTT upgrades are the best way to go.

A used HX-35 is the way to go if you need a smaller turbine housing - and if you can find a good one for under $300. Otherwise upgrade what you've got - unless you have way too much fuel for a Holset hybrid anyway. Then you are best served by saving the money for an S300 based turbo. Wish I had.