Just picked up a holset hx35 have a few ?'s

[Boosted DSM 32]

Hey guys just picked up a holset hx35 this weekend off a buddy its freshly rebuilt with a t3 housing. I dont have enough money for an external setup yet for it so im going to use the internal gate on it for a little bit. Im getting a t3 manifold off a friend for cheap and im going to need an o2 housing as well.. what type housing do i need? Am i going to need to change my downpipe too?

When the car is back on the road in the next month or so ill have Dsmlink v3.. Speed Density.. 880 injectors.. 255 fuel pump.. 3" exhaust and everything else you would need to run this turbo. I would like to see around 400whp on pump gas and i know that people have done it and it seems most are around 25 psi to get these numbers. Is it possible to see my goal with the internal gate on it? I really really want to see if i can get the car into the 11s with this setup if i can get 400whp i know its possible.

I also know that the oiling on these turbos has to be perfect for them to work properly but thats no much of an issue since my friend helping me build the car has used holsets before.

 

[WES_393]

Im not sure if any companies make an O2 housing or downpipe eliminator for the Holset 5-bolt flange. If they do, it'll most likely be with the wastegate portion blocked off. It's likely something you (or a shop) will need to fabricate. This is one of the reasons most go with the BEP housings (T3 or Bolt-On), there are O2 housing options available to them. And with pretty much any stock housing you'll want to rev higher than stock to take advantage of the power band, which requires some upgrades to the head. Not trying to shoot you down, but these turbo's won't bolt up without money and/or fabrication skills. I'd advise saving up for a proper setup and thoroughly researching in the mean time.

And even if your friend was a certified technician for Cummins, you should read and follow the oiling requirements yourself. It's not a simple task and your own car plays a big role in how to setup the oil system. So unless your friend is JusMX, be sure to check with the Holset repair manual.

 

[Boosted DSM 32]

Im not sure if any companies make an O2 housing or downpipe eliminator for the Holset 5-bolt flange. If they do, it'll most likely be with the wastegate portion blocked off. It's likely something you (or a shop) will need to fabricate. This is one of the reasons most go with the BEP housings (T3 or Bolt-On), there are O2 housing options available to them. And with pretty much any stock housing you'll want to rev higher than stock to take advantage of the power band, which requires some upgrades to the head. Not trying to shoot you down, but these turbo's won't bolt up without money and/or fabrication skills. I'd advise saving up for a proper setup and thoroughly researching in the mean time.

And even if your friend was a certified technician for Cummins, you should read and follow the oiling requirements yourself. It's not a simple task and your own car plays a big role in how to setup the oil system. So unless your friend is JusMX, be sure to check with the Holset repair manual.

I was just talking to my friend thats helping me and he said that were going to modify the downpipe to fit i didnt know you could do that (im learning new stuff everyday).But i know i plan to get cams and springs in it as soon as possible just not right at the moment because i dont have enough money because im a broke college student haha. I know you can still make good power on stock motor ive talked to a few guys that have went mid 11s on stock motor and i dont want to make maximum hp becuase my car is my daily and im still on the stock trans as well and dont want to be breaking stuff every time I race.

 

[TimF]

hey I am another poor college kid about to run a holset, and my 1g I am building is the same color as yours, were almost twins. I just picked up a hx35 to and already have the bolt on housing for it, but I read that the original housings flow better and was thinking about going to t3 rout with external gate. There are holset bolt on o2 housings on ebay right now I seen them a couple days age. Other than that what are the oil requirement for this turbo, I remember reading a bit about it and it needs to be regulated. The one I bought came with a SS feed line from the oil filter housing. My motor is not stock BTW but I am shooting for the same HP goals

 

[Boostdriven]

Every single diesel turbo I've put on my car or someone else's car I fed it from the clean port in the OFH with a #6 line for years and I have yet to have a problem. You can use #4 line, that will work too, but whatever you do don't use a restrictor especially if you have bep bolt on housing. Those holsets they can take some oil and I have facts to prove it. If you have enough oil pressure to kill a holset, which is not likely, then you have bigger fish to fry. If your oil pressure is under 100 psi at higher rpms (5000+) fully warmed up then I wouldn't worry about it. Always use good oil like valvoline 10w30 synthetic or regular, I use synthetic.

You have to make sure that you have a nice oil return line. I've used modified stock return from a dsm with success. Another thing you need to make sure is that you have good crank case ventilation. If you're still using the PCV valve in the valve cover going in to your intake manifold you need to get rid of it. When in boost you loose ventilation out of that port. Take the hose off the intake manifold and either cap that nipple or you can use it for your bov. On the valve cover, take that PCV valve out and replace it with another fitting that you can put a hose on and run it either to your catch can (preferably) or intake pipe before the turbo. That will give the crank case an extra port to breath out of when in boost.

If you do eliminate that hose from the intake manifold to the valve cover you might have to adjust your biss screw in the throttle body a bit by turning it out. By taking that hose off you just took away a little bit of air that your engine is used to taking at idle when in vacuum.

 

[TimF]

I am running a catch can with 8an fittings. I am debating between using the bolt on housing and running a Evo 3 exhaust mani with 38mm wastegate or going with a punishment racing t3 tubular with 38mm wastegate.

 

[Boostdriven]

If you already have a bep bolt on housing for it then evo 3 will be a cheaper rout for you. You will get faster spool up with it. If you plan on running external wastegate with it then you will need to get a custom o2 housing with a wastegate welded off of it where the original wastegate hole is in the exhaust housing.

With tubular manifold, I'm assuming there will be external wastegate of the manifold then you can use the stock 12cm exhaust housing just weld the internal wastegate flapper shut or drill and tap the flange (o2 housing) and put a bolt in it to hold the flapper shut.

 

[TimF]

Sorry I forgot to mention my evo 3 manifold has a wastegate flange already. But yes I have a bolt on housing already. I am just worried cause I read they dont flow as good as a actual holset housing

OP you can use one of these if you have a 5 bolt flange, there are also 4 bolt ones. Turbo T3 T4 Elbow Outlet O2 Stainless Downpipe DSM Eclipse Talon | eBay

I have yet to see a vband clamp one for holset

 

[Boostdriven]

Yes the stock 12cm housing will flow more then bep bolt on and if you're planning on pushing that turbo to its limits (30+psi) I would use the stock housing, otherwise bep will work just fine.

That link you posted for the o2 housing looks like its for a garrett housing. I'm not sure if it will bolt up to holset housing and even if it does you will still have to weld the factory flapper shut or do a bolt mod unless you're planning on using the internal wastegate with the stock 12cm housing.

 

[TimF]

I could be mistaking, it said t3/t4 flanged and I thought holsets had a 5 bolt pattern or vband stock

 

[Boostdriven]

Yes they both are 5 bolt but I'm pretty sure the bolt pattern is different. The stock flange on a holset should bolt up to the housing on one side and have a v-band flange on the other, it kind of works like o2 housing. They do have factory holset housings with v-band out but I think those are off of older turbos.

In your case since you already have bep bolt on housing I would just run it, you can always upgrade later. This will make your install a lot easier and you will love that turbo. I've ran bep housing on my HX40 before and it work good for my power goals at that time. HX35 has a smaller exhaust wheel then HX40 so it should work even better in that housing.

If you don't buy an after market o2 housing make sure you port match your stock one to the exhaust housing. If you end up using your wastegate on the manifold then you will need to weld the wastegate hole in the exhaust housing unless you buy o2 housing that does not use a dump tube but has a solid flange where the wastegate port is.

Post some pictures of the parts you have, if you can't email them to me and I'll look to see what might be some good options for you.

 

[TimF]

What would I use for a oil return? and pm me your email and I will send you pics

 

[Boostdriven]

You can use your stock return tube. Since are using a bolt on housing the holset drain might not be that far off from where the stock one is and you might be able to manipulate the flex in the stock drain to match up both flanges. You will need to cut the top flange bolt holes open to the outside to fit the larger bolt pattern of a holset. If you have some tools port the inlet of the top flange to at least some what match the drain hole on the holset, make sure you open up the gasket as well. Best thing to do would be to go to a parts store and buy some gasket making material and cut out your own gasket to the right size.

If you can not band the stock tube to match both flanges, you can cut the flex section out and just use some oil resistant 5/8" hose with good clamps to connect two tubes together. If the upper flange is to small to cover the holset drain hole then you might have to get a custom flange made or buy one on line. Take a piece of stock drain tube, enough to put a hose on and clamp it and weld it to that flange. This would be the cheapest way to do it if your trying to save money but it will work.

 

[greene]

you can manipulate the drain tube but be carefull as you bend it , if it requires more then a small tweak i would get an aftermarket oil drain to compliment your feed , oil to the turbo/motor is somthing i would want to make sure is done correctly

 

[Boosted DSM 32]

My car already has a stainless line coming from the oil filter housing so thats not an issue i just need to check and see if it has a restricter in it or not. I plan on making my own return so that its alot bigger and lets more oil flow through it. My buddy has used a holset before so he said that hes going to help me out with the setup...

Im getting a 3" megan racing downpipe and believe im going to go with a internally gated t3 mani to bolt up the turbo with. From what my friend was telling me we are going to have to modify the down pipe to bolt up to the holset hotside? I also am almost positive that with the t3 manifold im going to have to run slim fans because my stockers will be too large and get in the way of the turbo.

I am going to be running the internal gate on it simple for money reasons.. does anyone know how the internal gate will hold up up top of the rpm's? Im guessing that its going to fall off some towards redline.. but still dont think i should have any problem making atleast 350whp with a good tune on the internal setup with my supporting mods.

 

[Boostdriven]

My car already has a stainless line coming from the oil filter housing so thats not an issue i just need to check and see if it has a restricter in it or not. I plan on making my own return so that its alot bigger and lets more oil flow through it. My buddy has used a holset before so he said that hes going to help me out with the setup...

Im getting a 3" megan racing downpipe and believe im going to go with a internally gated t3 mani to bolt up the turbo with. From what my friend was telling me we are going to have to modify the down pipe to bolt up to the holset hotside? I also am almost positive that with the t3 manifold im going to have to run slim fans because my stockers will be too large and get in the way of the turbo.

I am going to be running the internal gate on it simple for money reasons.. does anyone know how the internal gate will hold up up top of the rpm's? Im guessing that its going to fall off some towards redline.. but still dont think i should have any problem making atleast 350whp with a good tune on the internal setup with my supporting mods.

If you plan on using a stock 12cm housing with internal wastegate I think you might have boost creep issues. The stock wastegate hole and flapper is a kind of small and might not bypass enough exhaust if you try to run around 20 psi of boost. I've never used it like that so I don't know for sure, maybe someone who has can chime in and give some more input.

 

[Boosted DSM 32]

If you plan on using a stock 12cm housing with internal wastegate I think you might have boost creep issues. The stock wastegate hole and flapper is a kind of small and might not bypass enough exhaust if you try to run around 20 psi of boost. I've never used it like that so I don't know for sure, maybe someone who has can chime in and give some more input.

Would porting the housing out help with that problem? If so i can port it out no problem the guy helping me has all the tools to do that as well.. I plan to go external ASAP just money is really tight with going to school

 

[Boostdriven]

Would porting the housing out help with that problem? If so i can port it out no problem the guy helping me has all the tools to do that as well.. I plan to go external ASAP just money is really tight with going to school

You can try to port the wastegate hole. The flapper on the stock 12cm housing is about 28mm so you can open up the hole to about 24-25mm but I'm not sure if that's going to be enough. You can try it and and see if it works if it don't work that well then you will have to take it easy on the car until you get external wastegate set up.