So I'm going holset

[jimmer009]

So after doing the single turbo conversion I was stuck with to small of turbo. But I just happened to stumble on a holset for 100 bucks. It's a hx35. The thing looks like monster and I feel like I should feed it my current turbo.

The inlet is 4 inch and its gonna be a tight pita. Has any one else been down this road??? Once installed daz will do the tune.

So my other question witch no I have not searched the crap out of is; I will need rods at the minimum run the turbo to 90% of its limit. I heard I can do them with out pulling the motor?? I can't find a diy on it. I have a lift. But my big question is can I do pistons from the bottom to??? I have a ring compressor. But is the bottom of cylinder tapered. Some motors they are some they are not.

[jaychen]

So after doing the single turbo conversion I was stuck with to small of turbo. But I just happened to stumble on a holset for 100 bucks. It's a hx35. The thing looks like monster and I feel like I should feed it my current turbo.

The inlet is 4 inch and its gonna be a tight pita. Has any one else been down this road??? Once installed daz will do the tune.

So my other question witch no I have not searched the crap out of is; I will need rods at the minimum run the turbo to 90% of its limit. I heard I can do them with out pulling the motor?? I can't find a diy on it. I have a lift. But my big question is can I do pistons from the bottom to??? I have a ring compressor. But is the bottom of cylinder tapered. Some motors they are some they are not.

Heads need to come off.. therefore pistons go out the top. Don't know how you are thinking you'll fit the rod/piston out the bottom past the crank.. watchu talking bout willis?

[jimmer009]

I read you can replace the rods from the bottom. But it seems like a hassle vs just pulling the head off. It's something I plan to do down the road. So now its timing chain rods and pistons.

[getslideways]

It's a hx35. The thing looks like monster and I feel like I should feed it my current turbo.

When I first read this I thought you were talking about a compound turbo setup, and I started to drool lol

Had a friend who ran an HX35 on an RB25 and was a great little combo.

[christianb5s4]

I read you can replace the rods from the bottom. But it seems like a hassle vs just pulling the head off. It's something I plan to do down the road. So now its timing chain rods and pistons.

No, you can do this on the 1.8t but not on the 2.7 if I recall correctly.

[jimmer009]

A Compound set up would be sweet. I don't think I'm am going to have to worry about spool up time. From what I read this turbo spools very quickly for the size.

What I read was saying the 45 degree angle of the heads let you get the rods out. So it couldn't of been for a 1.8. But none the less I think if your going to do job do it right. But by the time I save up for rods and pistons I'll need to do the timing chain to.

I think there is a heavy spring on the waste gate. Like 30psi. Should I change that out for a more stock spring??? I don't want to hit 30 psi or Will the n75 be alright to handle it??? Thanks for your input.

[Corradovolksb]

That's a bad ass turbo and will for sure bend a rod on stock bottom end. You can replace rod bearings in the car without pulling the heads but not rods. It will be a bitch doing rods in the car your best bet is the pull the motor.

[Corradovolksb]

Yes the stock WG is around 30psi and that's the lowest amount of boost your turbo will make at 0% n75 duty cycle. You should run external WG and weld the stock WG shut. That's what my buddy did with his Holset on his 1.8t and it's worked out great.

[getslideways]

I think there is a heavy spring on the waste gate. Like 30psi. Should I change that out for a more stock spring??? I don't want to hit 30 psi or Will the n75 be alright to handle it??? Thanks for your input.

you cannot go lower than what the waste-gate spring is set at. A boost controller (manual, electric, n75) can allow MORE boost pressure than the wastegate is set for, but it cannot set boost pressure LESS than the wastegate spring.

My buddy just ran an external wastegate, but I think aftermarket wastegate actuators are a possibility due to the holsets popularity, but dont quote me on that.

[aysix]

Stock bottom end on HX35, unless you're running E85.

[jimmer009]

I was hoping not to run an external waste gate. But I guess I have to do it. I'm just running pump gas with water meth injection. I'm planning in keeping the boost down around 15ish. That will give me the #/min for 450hp.

And I won't be turning it up and pushing power out it until a motor rebuild. And yes an engine pull. But then its on.

[redline380]

No, you can do this on the 1.8t but not on the 2.7 if I recall correctly.

Have you ever put pistons in any motor? They have to go in from the top. No way are you going to line up the ring compressor down there and pop them in.

OP might as well pull the engine. It will overall be less hassle since he will have to remove the pan anyways.

I was hoping not to run an external waste gate. But I guess I have to do it.

That isn't up to you. The stock holsets that come wastegated only have the gate on one of the turbine inlets, considering it is twin scroll. Only gating one of the sides will not be enough to control boost levels. Remember, it is designed for a diesel 5.7 engine.

There may be a single scroll gated hotside available, I do not know. But that will be necessary in order for you to run internally gated. Considering you have a multi bank engine, I can imagine you would want to take advantage of the twin scroll design, and thus you will be running two external wastegates.

[getslideways]

here is one guys solution to adding an external wastegate, claims it works, but sure aint the prettiest or most confidence inspiring, thats for sure lol:

[jaychen]

That's pretty fucking ugly, but loads of guys down under run their wastegate's straight of the turbine housing like that.

[DieselElectric]

Have you ever put pistons in any motor? They have to go in from the top. No way are you going to line up the ring compressor down there and pop them in.

I think he was referring to the fact that rods/pistons can be swapped on a 1.8 without pulling the motor.

Which is completely true, and is true for most 4 cylinders if you have the clearance to remove the pan. Just gotta pull the head too.

I agree, on a 2.7t it would be less time consuming to yank the motor.

I've also never heard of cylinder that wasn't tapered at the bottom.

[DieselElectric]

That's pretty fucking ugly, but loads of guys down under run their wastegate's straight of the turbine housing like that.

If the metal and welds are up to the task, whatever.

Personally, fuck that. I would rather run two wastegates off a tube manifold than potentially destroy a housing.

[Nichtknicken]

That isn't up to you. The stock holsets that come wastegated only have the gate on one of the turbine inlets, considering it is twin scroll. Only gating one of the sides will not be enough to control boost levels. Remember, it is designed for a diesel 5.7 engine.

There may be a single scroll gated hotside available, I do not know. But that will be necessary in order for you to run internally gated. Considering you have a multi bank engine, I can imagine you would want to take advantage of the twin scroll design, and thus you will be running two external wastegates.

I have heard of people drilling through the center divider in order to make the internal wastegate work, But I 100% agree that running the exhaust banks divided is a far better way to go.

OP which Hx35 do you have? exhaust housing size? Any pictures of your current setup?
Keep updating, I'm interested in how this goes for you, I have an HX40 18cm in my basement waiting for sometime that my S isn't a daily anymore.
( I Think there is a thread on Nefmoto from a guy running a VGT Holset ) Good Luck!

[jaychen]

more than one way to skin a cat, and frankly, it's an extremely effective way to minimise boost creep

[jimmer009]

I have replaced pistons before and I have set cranks before on 302's and a 350. I wasn't sure if Germans did something different. But I might as been reading some ones sarcastic remark as fact. I'll pull the engine when i do rods pistions and timing chain.

I'm not ready to blow a hole in the housing and bolt a waste gate to it. I have plenty of room on my header under the base plate for an external waste gate. I'll try the pics. There such a pain. I'm in a cell phone and a laptop. It's a custom single conversion we made our own headers and I have a cross over pipe. 3 inch exsaust 630cc injectors 85mm maf and a daz tune. Right now the turbo is a vf8. Way to small but we are fixing that

[NOTORIOUS VR]

I have replaced pistons before and I have set cranks before on 302's and a 350. I wasn't sure if Germans did something different. But I might as been reading some ones sarcastic remark as fact. I'll pull the engine when i do rods pistions and timing chain.

I'm not ready to blow a hole in the housing and bolt a waste gate to it. I have plenty of room on my header under the base plate for an external waste gate. I'll try the pics. There such a pain. I'm in a cell phone and a laptop. It's a custom single conversion we made our own headers and I have a cross over pipe. 3 inch exsaust 630cc injectors 85mm maf and a daz tune. Right now the turbo is a vf8. Way to small but we are fixing that

does your up pipe have a twin scroll flange on it?

[jimmer009]

No not yet. But I have the base plate made for it. Just have to put it on is all.

[NOTORIOUS VR]

Then just swap to a single scroll holset turbine housing... the HX35 is small enough not to worry about it needing to be twin scroll.

[Monty23]

Then just swap to a single scroll holset turbine housing... the HX35 is small enough not to worry about it needing to be twin scroll.

or plumb the wastegate into the up pipe, and add a SP QSV and really take advantage of the twin scroll housing...

[jimmer009]

It is not a twin scroll.

But what is add a sp qsv???

[jimmer009]

I was wrong sorry it is a twin scroll.

[Monty23]

http://www.spracingonline.com/store/...ool_Valve/3659

[jimmer009]

That is very bad ass great idea

[redline380]

That is very bad ass great idea

Likely not needed, though. Would make more sense on a 1.8t

[jimmer009]

Yea I'm hoping not. I still like the quick spool idea. But I'm gonna how it goes first.

[Monty23]

Likely not needed, though. Would make more sense on a 1.8t

3rd gear - 30 psi at 4K is worlds different then 30psi at 4500. However the big plus side to variable A/R is you can run a much larger A/R exhuast side for top end efficiency and still have great response. But a speed sensor and EGT monitoring should really be used in conjuction with the QSV to ensure nothing catastrophic happens. The SP QSV also doesn't tolerate anti lag boom booms very well from what I'm told, so something else to keep in mind.

I will be using one with my future 07K swap.

[NOTORIOUS VR]

a 2.7 will have no issues to spool an HX35 with a properly chosen hot housing... there's no need to make any of this complicated.

[Nichtknicken]

a 2.7 will have no issues to spool an HX35 with a properly chosen hot housing... there's no need to make any of this complicated.

The common 14cm housing HX35 seems to be numerically equivalent size to the (2) 7cm housings that 770r's supposedly come with. I wouldn't be too worried about spool either.

[jibberjive]

If I were going through the trouble of building a custom setup to run a Holset, I would put the extra effort to go with a VGT turbo. May be just me though.

[martin0079]

Since he is single turbo already correct me if I am wrong but I think you can pull the heads with the engine in the car. I mean it would be way more annoying than just pulling the engine but doable with a single tirbo.

[a4kamila6]

Listen to what notorious vr suggested. Find single scroll housing for your turbo. Problem solved.

Quick spool valve is the kind of thing that will either make you happy, or blow your motor if it malfunctions or fails. Not saying it will, but i am not yet sold on it.

Quick spool valve on a EFR turbo makes more sense..integrated speed sensor, integrated boost recirculation valve, a few more goodies.

But being you got that holset basically free, just find a different a/r housing


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[jimmer009]

I'm gonna put it on this weekend. And see how it works. I am hoping I can control the boost n75 for right now. I just switched waste gate actuators. It now has a 7psi spring. But if I can't control it I'll get a external. I do drive it every day. But I also live 2 min. From my work. So I will just baby it.

I'm not ready to worry about vgt. I don't kniw enouh about them besides my buddy has one on his 6.0l and the thing is very fast. But I'm going to be careful with this. I know the turbo is to big for my motor. But daz is going to tune it after I figure out controling the boost.

I think it will spool up fine. But I am gonna want it at its best. So if there something I don't like I'll just go from there. Thanks for all the input. And yes I'm sure I will end up external waste gate

[NOTORIOUS VR]

I'm gonna put it on this weekend. And see how it works. I am hoping I can control the boost n75 for right now. I just switched waste gate actuators. It now has a 7psi spring. But if I can't control it I'll get a external. I do drive it every day. But I also live 2 min. From my work. So I will just baby it.

I'm not ready to worry about vgt. I don't kniw enouh about them besides my buddy has one on his 6.0l and the thing is very fast. But I'm going to be careful with this. I know the turbo is to big for my motor. But daz is going to tune it after I figure out controling the boost.

I think it will spool up fine. But I am gonna want it at its best. So if there something I don't like I'll just go from there. Thanks for all the input. And yes I'm sure I will end up external waste gate

The turbo is not too big for the 2.7t at all, I don't see any issues running your setup if it's all done and tuned correctly it should be quite nice

[jimmer009]

Thanks man. It's great to hear encouraging words as they can be few and far between in forms. From what I understand if I run over 15psi or 45#/min I'll be over the safe 450ish HP if I was to run 25psi the volume would probably bend a rod. That's all I mean by the turbo being to big.

[NOTORIOUS VR]

Thanks man. It's great to hear encouraging words as they can be few and far between in forms. From what I understand if I run over 15psi or 45#/min I'll be over the safe 450ish HP if I was to run 25psi the volume would probably bend a rod. That's all I mean by the turbo being to big.

You won't be anywhere near the safe limits @ 15 psi.... and you'll certainly want to run more boost for all the work you've gone through.

Stock motor does just fine, and I don't see why you wouldn't be able to run over 20

[DieselElectric]

I think the safe limit is closer to 500hp, and that's measuring at the wheels.

Crank it up.

Of course "Safe" might change from person to person. If you absolutely don't want to risk popping a motor, 450 is probably a pretty safe number...