BleedingSilver said:

Very true, I just favored how much cleaner and more compact everything is with an internal gate. Im trying to find a cheaper tubular o2 housing and 38mm wastegate for cheap but so far no luck. Then again I can't really do much till i get my tax check in hand

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If you know a fabricator or can fabricate fairly well on your own, you are set.


Pick up one of those eBay knockoff stainless o2 dump housings. Cut the dump pipe off right at the turbo flange, and reweld it with the dump pipe facing upward and outward slightly.

Now grab an XS Power 38mm external gate....any of these that I've seen come with two weld-on flanges, so you're set. Cut the dump pipe that is facing upward fairly close to the turbo flange. Weld the external gate's base flange to the small upward-facing curve that is coming out of the wastegate passage.

Now you're ready to mount the wastegate, and fab your dump tube using the remaining flange and dump pipe pieces.



You're essentially building one of these:




...out of one of these:




....for not much more than what it costs to get the internal gate housing option from Bullseye.

Gooberlog said:

Not to get off topic, but has anyone seen the episodes of Trucks on Spikes' Powerblock TV on Saturday mornings. The guys on trucks have been doing a build taking a 70's Ford crew cab body and dropping in on to a Late 90's Ram 2500 Cummins chassis. I just think its cool to see the Holset on TV even if they aren't relating it to a dsm. Today they showed they were clocking the turbo so that they were able to rotate the turbo and manifold assembly upside down to make room for the heater assembly on the Ford's firewall.

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Saw that episode today, actually. Yesterday I was too busy digging snow.

What I thought was interesting was they made it seem like they had an early-90's Cummins and Dodge truck frame, but the turbo was a 7-blade HX35 with the wastegate provision on the cover so it had to be at least a '99.

Still thought it was cool....they're so power hungry I would've loved to have seen them go for a HX40 and say they bought it from someone like Goldfarb.

jusmx141 said:

If you know a fabricator or can fabricate fairly well on your own, you are set.


Pick up one of those eBay knockoff stainless o2 dump housings. Cut the dump pipe off right at the turbo flange, and reweld it with the dump pipe facing upward and outward slightly.

Now grab an XS Power 38mm external gate....any of these that I've seen come with two weld-on flanges, so you're set. Cut the dump pipe that is facing upward fairly close to the turbo flange. Weld the external gate's base flange to the small upward-facing curve that is coming out of the wastegate passage.

Now you're ready to mount the wastegate, and fab your dump tube using the remaining flange and dump pipe pieces.



You're essentially building one of these:

You must be logged in to view this image or video.

...out of one of these:

You must be logged in to view this image or video.

....for not much more than what it costs to get the internal gate housing option from Bullseye.

Click to expand...

If I was good with Ebay I would be all over this idea now that you mentioned this. Hell Im old fashioned. I don't even have a paypal account. You order this for me and do the work and i'll send you the money. please.... pretty please...

jusmx141 said:

Simply put, the BEP internal gate housings can't maintain boost over 20psi because the flapper and hole are too large, and the Holset housings can't maintain boost under 20psi because the flapper and hole are too small and only pull from one side of the twin-scroll housing.

If you want the most out of one of these setups, going external is a must. The moral of the story is don't be a cheap-ass....you've already saved enough money by getting a 60lb/min turbo for $300 or less (in most cases), so why not spend the money you saved to assure that it will perform properly?

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Having the hole on one side of the housing doesnt matter too much if its used with a non-divided manifold. Id consider it a lot better than mounting a wastegate on only 1 runner of a manifold.

Not everybody needs to run less than 20psi, even though i got mine down to 18psi and could have gotten it a little better with more work. This was with the 8 blade though. I didnt go any further with it because i planned on always running 30-40psi anyways so i didnt put too much effort into getting it down. I didnt mind going the cheap-ass route because i put the whole setup together with parts on hand for basically nothing that outperformed the more expensive previous setup that cost me close to $1000.

BleedingSilver said:

You order this for me and do the work and i'll send you the money. please.... pretty please...

Click to expand...

I would man, but I'm far from being a good welder. I know good welders, but they won't work for free....and price is what we're shooting for here.

Not to mention this is something you kinda need to fit to your particular application. I'd build it and the wastegate would hit your rad or something because of the angle I set the flange to.

jusmx141 said:

I would man, but I'm far from being a good welder. I know good welders, but they won't work for free....and price is what we're shooting for here.

Not to mention this is something you kinda need to fit to your particular application. I'd build it and the wastegate would hit your rad or something because of the angle I set the flange to.

Click to expand...

I'm still teaching myself how to weld. welding is one of those things though that your never done learning how to do. Theres always a technique to improve on. I'm not sure if I can trust my welding yet to support weight or deal with the abuse of heat that a wastegate dump would produce. I don't think you could manage to hit my rad or really anything for that matter. I don't have power steering and I have the alternator relocate kit. I understand though

Out of curiosity, how many people actually choose the hx35 for a daily driver/evil street car. I am going to have some fun with my gsx this spring/summer when I get some money and the goal is 400+ awhp but It's a pain to pick a turbo thats enough, but not way to much. It's between and hx or fp green at this point.

spartan69x said:

Out of curiosity, how many people actually choose the hx35 for a daily driver/evil street car. I am going to have some fun with my gsx this spring/summer when I get some money and the goal is 400+ awhp but It's a pain to pick a turbo thats enough, but not way to much. It's between and hx or fp green at this point.

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Why on earth would you even consider a FP Green? Go with the Holset. It's my street/daily driver and I love it. And it cost way less than any of FP's turbos.

dsm-onster said:

14.4psi absolute air pressure (psia) at the inlet.

Below is the 7blade hx35/hy35 compressor map. Mass flow in lb/min is corrected to the inlet pressure and inlet temp on top right. All holset compressor maps assume 85*F and 14.4psi at the inlet.

(PIcture)
Below is the hx55 compressor map and airflow (.75kg/sec)

Click to expand...

This map smells funny to me.. I have put a HX50 (h2c) on a LS1, and honestly I am about to give him one of my HE351ve's, because I think it will make more power... There are too many variables to go by that map with any real stock in it... As I think the few he531VE's are a bit on the small side as well.

60mm inducer, with a 8Xmm exducer does not promise 800whp in my book.... But I do understand that most HX50's were 67mm... so the confusion starts there for me as to why everyone considers H2c = hx50.

And just because i havent seen this posted before... I will add it.

jusmx141 said:

Saw that episode today, actually. Yesterday I was too busy digging snow.

What I thought was interesting was they made it seem like they had an early-90's Cummins and Dodge truck frame, but the turbo was a 7-blade HX35 with the wastegate provision on the cover so it had to be at least a '99.

Still thought it was cool....they're so power hungry I would've loved to have seen them go for a HX40 and say they bought it from someone like Goldfarb.

Click to expand...

Yeah i heard them referring to it as a early '90s cummins, and i was thinking, i'm pretty sure in an earlier episode i heard them say "this 7blade HX-35 turbocharger" yada yada yada, and i was like, "That's the one i want!" I thought it was so cool to see this on tv even if staying on it's original platform. I guess when they are going back in forth between a late 90's dodge and a '70s Ford, they figure, what's the big deal as long as we're referring to the truck with in 10 years of it being made. I love those shows though, i'll watch the power block every saturday and then go work on the laser. Even if they do make some of the stuff seem a lot easier than it really is... IE: 5 min in to the show "and now we're just wrapping up this STS Turbo kit on this LS1 Camaro" (me exaggerating of course.)

I've actually heard one of the shows give a local shop a plug on Horsepower once. Was for Mandrel Bending Solutions. They're about 25 min from me, and have an online store where you can buy mandrel bent exhaust piping, inter cooler piping, clamps, hardware, couplers etc. I was going to have them fab up a 3" exhaust to dump in front of my rear tire, but i found a cheap turbo back instead. They told me they are the only people around MD and this area in general that can mandrel bend 3". And they can go as big as 4" if i recall. Was pretty cool to hear a show based in TN to plug a shop that's in MD.

darkhorizon said:

This map smells funny to me.. I have put a HX50 (h2c) on a LS1, and honestly I am about to give him one of my HE351ve's, because I think it will make more power... There are too many variables to go by that map with any real stock in it... As I think the few he531VE's are a bit on the small side as well.

60mm inducer, with a 8Xmm exducer does not promise 800whp in my book.... But I do understand that most HX50's were 67mm... so the confusion starts there for me as to why everyone considers H2c = hx50.

And just because i havent seen this posted before... I will add it.

You must be logged in to view this image or video.

Click to expand...

Don't forget that above map is refering to holsets own massflow perameter. The horizontal axis is NOT rendered in lb/min. It is accurate for the 58mm hx40 and the super40 (60mm). So that is the real map for the hx52. But you have to convert the units to lb/min.

Do you mean h2e? The h2c is not the older version of the hx50. The h2e is. And even then we're talking just frame sizes. The h2e frame size has several compress options as does the hx5* frame size.

An h2c compressor:


About 700cfm, close to the flow of an 8blade hx35. I'm sure this is a smaller h2c compressor map than what the 60mm h2c would have. But remember then hx40 60mm compressor only flows 68lb/min and that is with revised aerodynnamics to the h1 and h2 era turbos.




An h2e compressor:


Right at the same flow as the 60mm hx40. Slight less efficient and a bit narrower: characteristics of altering the blade count and angle . . . As you can see the horizontal axis at the bottem is in that same mass flow perameter as that holset flyer. And the top horizontal axis is the conversion to lb/min.

I wanted to show what I did with the waste gate actuator from BEP. It took some cutting, drilling, and welding but it works great.
http://www.dsmtuners.com/forums/attachment.php?attachmentid=106064&stc=1&d=1265654732
http://www.dsmtuners.com/forums/attachment.php?attachmentid=106065&stc=1&d=1265654727

It is an HX-35 with .55 BEP bolt-on housing. I substituted the bracket the wastegate actuator came with for one of the clips that holds the turbine housing to the center section.

Wow, I could see why! GVR4's have NO rad-to-turbo clearance!

joyfil2001 said:

Why on earth would you even consider a FP Green? Go with the Holset. It's my street/daily driver and I love it. And it cost way less than any of FP's turbos.

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TY for the imput, now I shall look for one, and find a bolt on housing and external gate setup.

The stocker fan shroud even had to be cut in order to fit but I already purchased a Mishimoto 10" slim line fan to replace it with.

i dont know about the gvr4's but with my 1g i was able to put the slim line in front of the radiator to gain some room, maybe that would help you

I haven't looked but my gut tells me that there is not nearly enough room on a GVR-4 to fit as a pusher. The clearance of the slim line I bought is significantly better than the stocker, 4 inches better. All I need is to be able to clear the turbo inlet enough to get a turbo pipe installed.

Did I buy the wrong HX35W to use a BEP bolt on DSM housing? There are only 4 bolts instead of 6 on the exhaust housing.

Poor guy is runnig about 7psi on a non MWE turbo... that barely reads on the map at that PSI..

force it in - It looks like you have an HX35 but with a WH1C turbine housing. The BEP housing should work

Thanks I'll try it this week and report back.

spartan69x said:

TY for the imput, now I shall look for one, and find a bolt on housing and external gate setup.

Click to expand...

PM Justin. That's where I got mine.

force it in said:

Did I buy the wrong HX35W to use a BEP bolt on DSM housing? There are only 4 bolts instead of 6 on the exhaust housing.

Click to expand...

All factory HX35 housings that I've seen mount with (4) bolts.

If you have a HX35, it will fit into a BEP housing.

force it in said:

Did I buy the wrong HX35W to use a BEP bolt on DSM housing? There are only 4 bolts instead of 6 on the exhaust housing.

Click to expand...

The BEP housing will fit, it comes with new clamps and bolts (3 new clamps and 6 new bolts)

Thanks guys. You don't know what a relief it is to hear that. I've been reading these Holset posts for quite awhile now. Now I'll be jumping on the bandwagon.