holset turbo??

[rcrdps]

my hx52 has the feed and return flange bolt pattern are standard like the garrett's. if i remember the hx35 / 40 has the thread on the inlet hole, 12MM-1.5and the return has the standard flange

Check this out. This is what I'm planning on using to keep from getting custom lines. The RB turbo is 12x1.25. This bolt is 12x.1.5.http://www.atpturbo.com/Mercha...e=BCS

After I get mine installed, I hope to do a full writeup with all of these sizes. They've been a pain to track down. I can't seem to find extended studs to mount the turbo with a spacer. They are 10x1.25. I bought long bolts that I'm going to cut off and use as studs. Not the same, but it's all I have for now. EDIT: I just took off my studs, and they are actually 10x1.5 on the manifold side. They are 10x1.25 on the turbo side. So now I have to get new bolts in 1.5 pitch.

EDIT: This is for the HX35
Modified by rcrdps at 9:42 PM 3/31/2009

[rcrdps]

Oh. By the way. This will effectively remove the oil restrictor. It is originally in the stock banjo bolt. I'll measure the new bolt internal diamter when I get it. My HX35w was sent with the oil feed line. The fitting that went into the turbo was the restrictor, I believe. It had an internal diameter of .150. Pretty large. But Holset's recommended pressure is pretty high. If this bolt is too big, I'll just weld it closed, and drill it back out to .150.

Gene

Edit: I have taken off both banjo bolts for the stock turbo oil feed. It is restricted at both bolts. So I'm replacing the banjo bolt on the turbo side to be the right thread, and I drilled out the one on the engine block to .120. That was a compromise between .150 and .100 that some use.
Modified by rcrdps at 9:39 PM 3/31/2009

[Cjmartz2k]

After I get mine installed, I hope to do a full writeup with all of these sizes. They've been a pain to track down.EDIT: This is for the HX35

Sounds great!

[Largekid]

woot for holset powered rbs

[silviasgp06]

finally got my HX35w the other day...... and only paid $70 too but then again ive had a shop credit there for returning a MAF that cost me $80 a year ago when I did my swap. but $150 total real cost is awesome

[Nissan2367]

I just got my H1C on today and running and i love it! Its a cheap twinscroll turbo and spools pretty quick for its size! I would go holset over anything else for a turbo upgrade.

[rcrdps]

I just got my H1C on today and running and i love it! Its a cheap twinscroll turbo and spools pretty quick for its size! I would go holset over anything else for a turbo upgrade.

Post pics. Would like to see how you accomplished things like the downpipe, oil lines, and intake routing.

Gene
Modified by rcrdps at 8:50 AM 3/29/2009

[nyc240sx]

yea the hx50 is huge and heavy the exhaust housing it takes a 5 inch v band down pipe which i think is not gonna work and also forgot to mention my motor is stock i have the greddy intake manifold, greddy timing belt, i run 20w50 royal purple oil in the motor and royal purple in the trans too. Other than that its STOCK like a Mothe* Fu*****... Also am i going to have alot of turbo lag because of the diameter of downpipe...Any suggestions? Greatly appreciate itThanks

You know that thing is like GT40 size, right? What size exhaust housing? Built motor?

[Largekid]

with a fairly stock motor, you arn't going to see full boost till its time to shift and will probably be WAY outta that turbo's efficency range. Are there big plans to accomodate this turbo on your motor? cams/bore/nitrous/etx?

[nos487]

Be sure to post some pics and mods.

[Cjmartz2k]

I wouldn't say that about the HX50. It's big, but not THAT big. You could spool a GT40 by less than 5k rpm on a RB25. I have no experience with what exhaust housings do what on HX50's, but my buddy is running a HX52 on his RB25 with big cams and a P&P'd head and he's at 1.5 bar by around 4.5k rpm. It's a drag turbo for sure I'd say, but not unusable on a street car. Just don't plan on doing any auto cross with it

[MATTs14]

Exactly what size is the threaded hole on the oil feed side of the hx35 and also do i need a restrictor for it?? Been searching all day and still no luck. I read on some of the dsm forums that it was a -4 AN fitting but im not real sure

[rcrdps]

Exactly what size is the threaded hole on the oil feed side of the hx35 and also do i need a restrictor for it?? Been searching all day and still no luck. I read on some of the dsm forums that it was a -4 AN fitting but im not real sure

Quote from boostfab earlier in this thread - "if i remember the hx35 / 40 has the thread on the inlet hole, 12MM-1.5and the return has the standard flange"

Also, I have measured it myself and that is what I came up with too.

EDIT: -4AN is 7/16" which comes to about 11.1 millimeters. So yeah, -4AN is probably close enough.

[Nissan2367]

Here are some pics of my Holset build...zer...picks

[MATTs14]

EDIT: -4AN is 7/16" which comes to about 11.1 millimeters. So yeah, -4AN is probably close enough.

Im pretty sure the AN reading are supposed to be put over a denominator of 16 so if you have -4AN then put the 4 over 16 and it makes it 1/4" and so on. Just thought i would clarify

[rcrdps]

Im pretty sure the AN reading are supposed to be put over a denominator of 16 so if you have -4AN then put the 4 over 16 and it makes it 1/4" and so on. Just thought i would clarify

Yeah, but that's for the hose size. The thread size is different. I grabbed the 7/16th's number off of wiki. -4 AN is also 20tpi, which would be 1.27mm pitch. Pretty close to the 1.25 of this fitting.

Gene

EDIT: I just re-measured with a better caliper. It's .465 inches. That's 11.8mm. So it's definitely metric sized, but the AN size will likely fit.

[rcrdps]

FYI. I edited my posts earlier in this thread to show what I've found out since I've been taking my turbo off today.

Gene

[rcrdps]

Here's some info for this thread:

The internal wastegate on a HX35w, and on an RB20 can only get down to ~18-19 psi even with the wastegate held fully open. So, if you're shooting for more psi than this, then your cool. But you can't get any lower.

That is my delima right now. I had planned for 8-10psi, but now I've got to plan for 20psi since I built mine with the internal wastegate.

Gene

[Cjmartz2k]

Interesting. How much timing are you running like that? If it's on the edge of creeping, your exhaust manifold pressure and temps are going to be really high and I doubt you can put much timing into it. Did you port the internal gate any?

[RustspecS13]

Is there a smaller holset? Like a HX30 or something similar? Because I dont quite want a 400WHP capable turbo, but Im not sure an RB25 turbo will give me the power I want on my RB20.

Im just looking for a 300wHP responsive setup for DD and drifting, but I want a holset.

~Alex

[Cjmartz2k]

They do make HX30's, but nobody really plays with them much so there is not a lot of info out there about them. You could always be a pioneer though. 300rwhp is stock RB25 turbo range though.

[rcrdps]

Timing is stock. I did have my fuel at around 12:1, but since I couldn't get my boost down, I've bumped fuel pressure up to around 50psi. I think I'm going to go with 55psi. I haven't been able to keep the intake couplers on. Gotta find some t-bolt hose clamps.

So I haven't made any real long hard runs to get everything sorted out. A long run usually results in blowing a coupler off, and I have to limp back home.

I've got a couple things to do today. Gotta relieve some stress off an intake coupler( that might help it stay on). Fix some exhaust leaks( hopefully that will get my wideband reading consistently). And gotta fix a water leak. Then maybe I can get some solid runs in and see where I'm at mixture wise. Right now I'm going on theory.

Gene