Holset HX30
 

Hi well i'm planing on putting this turbo to my car(Mexican Stratus turbo 2.4 dohc engine 4cil) i want to push 300whp on dd so i want a decent spool. Can anyone tellme if the HX30 will be a good option for my goals.?


Congrats for such a nice forum. I wish in Mexico someday we have a forum like this.

Thanks in advance.
Carlos.

Re: Holset HX30
 

Why in Mexico? This forum isn't just for American's/English Speakers, though I'm sure many people on here want it that way. Anyway that turbo should do nicely for the size engine you're putting it on. I don't know the projected spool time.

Re: Holset HX30
 

Well i mean because all the forums in mexico have a bunch of hijacked threads. that's why..

So anybody here have any experience with such turbo HX30 ?

Re: Holset HX30
 

I'm the only one.

I already told you what I know on the jyturbo list.

Ask Pikas said (he's the guy I send people with Holset Q's to) he's looked for HX30 and never seen one.

I doubt there are more than four people on this forum running Holset HX-series turbos, and it's probably three HX35s and one HX40 if memory serves.

Re: Holset HX30
 

It is rated for applications no more than 240HP.

Re: Holset HX30
 

Is there anywhere to find specs on Holset turbos? I don't care about HP ratings, I want trim sizes, flange type and A/R's of the holset turbos. Anyone have them?

Re: Holset HX30
 

my friend either has an hx 30 or 35..don;t really remember. it spools up surprisingly fast for that size turbo. made big power on his d16 mini me swap...problem is that i couldn't find any rebuild kits for it..i tried the standard t3 bearings, and they don't fit.

Re: Holset HX30
 

Whitey, turbomustangs.com is a good place, a number of those guys are very savvy. Pikas haunts thirdgen.org and a number of mailling lists. Everything is primarily T3 or T4 flanges, and there are no ARs per se as Holset uses the (far more accurate) cm^2 nomenclature. General rule of thumb for the HX-series is HX35 is going to have 12 cm^2, HY35 (I think HX30 does too?) 9 cm^2 , and HX40 22 cm^2... although you can get housings in all sorts of different flavors both from a Holset dealer as well as from the yard.

staticchmbr, I'm sure you'll find Nissan Sentra engine bearings don't fit into Honduh engines, too. Yes, this makes no sense and is very confusing! I have no idea why it is done this way. I have asked for help with this problem, and people recommend I order parts for a Honduh instead of a Nissan ??? I can't understand why this ---- doesn't just fit right in, or why I should find a Honduh dealer... :l


I'm uploading HX30 vs .60/.63 T3 pix now from my phone, hang a sec guys. If they aren't up in ten min I got rushed for time before work + it will be tonight approx midnight EST.

Re: Holset HX30
 

Alright, the pics are a bit shitty, but what do you expect of a camera phone?

http://www.redpepperracing.com/galle...14153209_0.jpg

http://www.redpepperracing.com/galle...14154384_0.jpg

http://www.redpepperracing.com/galle...14154385_0.jpg

http://www.redpepperracing.com/galle...14154386_0.jpg

Physically, the turbos are almost identically sized in respect to outside dimensions. Pretty petite package.

As far as the wheels on them... turbine wheel on the Holset is slightly larger, probably equivalent to a "stage 2" turbine found on one of the T3/T04 hybrids. The compressor wheel, right at the entry, is pretty much the same size BUT (lacking pics this may be confusing but I'll try my best) the T3 wheel is more of a solid chunk, where the HX30 wheel is pretty shallow + has a larger OD at the base.

I found my notes, HX30 looked to be equivalent to .50 trim T3/T04E, but with Garrett GT-equivalent efficiency at 1.5+ pressure ratio. Basically, it's going to be about as good as a straight T3 "hp per psi"-wise until you go 10+ psi, and then it should start flowing pretty well. Expect 350 whp out of it, but you'll have to run some fairly high boost levels to get there. RJWaggs, keep in mind that hp is a function of tq @ rpm, and when Holset recommends the HX30 for 240 (crank) hp on a diesel... 2500-3000 rpm stationary diesel generator to be specific, which is what HX30 primarily come off of, that translates to a LOT of flow as tq is probably in the 400 ft/lb range at that point.

Re: Holset HX30
 

Yeah I'm on TM quite frequently and all I really see on Holset turbos is the generic "the HX35 is good to 350 hp" :-\

Why is the A/R's, trims and housing types such a secret?

Re: Holset HX30
 

Does a flow rate of .35(kg/s) do anything for ya?

Re: Holset HX30
 

:l

Actually, they most power I am aware of one pushing is 558 whp @ 30 psi on a DSM. Which is pretty fucked, the map goes higher than 30 psi for a reason, there is no excuse for not tapping 600+. It's optimized for high pressure ratio boosting w/ efficiency... if you're looking for OMG 300 whp at 9 psi on your GSR with Full-Rice kit, well, walk and shop baby walk and shop.

When you consider Holset's blurb is the HX35 is good for .46 kg/s (75 lb/hrs) @ 3.0:1 pressure ratio... well, what amount of boost is 3:1 PR? Anybody care to speculate?


They aren't a secret. Holsets just aren't fluent in the gasoline world, compounded by most of the aftermarket enthusiast guys who've called Holset and asked Q's not pertaining to diesels have found themselves hung up on, or email communication suddenly goes ignored. I could go off on a tangent about how wierdfuk diesel guys are, they really aren't at all interested in going fast so much as they are in something "that pulls." Their eyes glaze over when they say pulls. Maybe you've tried talking to a few, like I have... :-\

But, yeah, Holset uses cm^2 nomenclature which is more accurate than A/R as it tells the actual aperature size at the point of intersection with the wheel... the actual shape of the "funnel" that the scroll is can them be optimized for various flow characteristics as it no longer needs to be a homogenous Area/Radius throughout, and the actual orifice size at the point of intersection of the wheel tells us everything we need to know about flow/mass/velocity as it pertains to spool, etc.

Housing types aren't secret, the info is just not publicly published. A lot of the Garrett stuff isn't, as well, but some people are good(ish) about disseminating the information to the aftermarket... but you notice between Precision, Turdbonetics, Innovative, etc, they all use different terms or names for the same part they all bought directly from Garrett. A number of the Holset compressor maps have been floating around the interweb recently, and you can derive a fairly good idea of where your point of spool will be based on anecdotal information. Not that it's going to be the same for two identical engine/turbo combos that have different manifolds, sometimes (Honduh world) it's as much as 1500 rpms spool difference!

If we haunted diesel forums, I am sure we'd have a better grasp, depending on our ability to infer aforementioned anecdotal evidence on the gasoline applications we are familiar with.



Flow rates are "the same thing" as the HP ratings Whitey said he doesn't care about. :P

Well, there are 360 seconds in an hour, and 2.2 lbs in a kg, so .35 kg/s turns into 57 lb/hrs :o General rule of thumb sez 570 whp!!

http://www.holset.co.uk/files/2_1_1_2-HX30.php

I think the Holset blurb on those is inaccurate, as that is HY35 power territory... there is a compressor map handed around for the HY35 that states it is for HX30 (Honda-Tech FI forum thread somewhere on or about page 24-28), although the poster said that this is not true. BUT it makes me wonder if there aren't different HX30 compressors?

Or maybe not... the HX30 wheel *is*... "shallow" for lack of a better word, but it's OD is about as large as HX35. There's a lot of it covered up by the compressor housing. And the Holset blurb claims .35 kg/s @ 3.1:1 PR, so it's map is good a bit above HX35...

---- it, I may modify the STD manifold for the red car to accept external wastegate and run the HX30 on the high CR SOHC. It's freshly built, no reason not to, y0!

Re: Holset HX30
 

Excelent.. that was the info i was looking. Now if the holsets turbo made that kinda of torque i hope my trany can handle that amount :D

As soon i have it done my car i will put some dyno sheets here to share !!

Thanks for all that info.

Re: Holset HX30
 

I wish I knew more about the turbo I owned. I feel like I gave you some good information, but if you read close I gave you a lot of speculation and guesswork, too.

Pick apart everything I said before you go with it... I have a problem with making ideas I'm fascinated with sound like a sure thing, when they're NOT.

Re: Holset HX30
 

Lol, I said "generic statement," I have no idea what an HX35 was rated at HP wise. :8

Re: Holset HX30
 

.46 kg/s = 75 lb/hrs.

At 3.0:1 pressure ratio.

3.0:1 PR is what psi?

Wouldn't it be funny? If HX35 is actually 750 whp turbo?? But nobody has the balls to push that high because OMG HP PER PSI is all that matters?? :l :l :l :l

Ben Strader would laugh at such volumetric efficiency bullshit, although he's required to teach it because, and I quote, "It's what everyone expects me to teach."

Re: Holset HX30
 

Thanks one more thing can you please give me all the stamped numbers you have please ?

BTW i will like to push it something like 17 psi for the street and 25 psi on the drag track.

uhm if i'm not wrong 3.0 PR is 29.4 psi

Re: Holset HX30
 

I'll have to go back to the turbo and look *real* close, it'll take a couple days. Somebody ground on the number tag when trying to grind the "HOLSET" raised logo off the compressor... I had to squint real hard in bright light with the turbo cocked to the side to read the numbers. They were still legible, but turning the turbo 1/16" too far made them blurry.

I ordered a kit for it from a Holset dealer in Johnston City, TN... they took forever about ordering/shipping it to me, and then the thrust washer was completely wrong. I ended up re-using the original thrust washer as it was fine - I guess the whole turbo was fine, but I'm ---- and only have $225 in it as it sits. Had too many used turbos go belly up on me.