Recommendations to low lag Hx40

TAMA_player · May 27, 2017

Asking for a little help to avoid waste of time and money here (I have a new baby so money is not to spare

)

I just found a very good deal on a HX40 and i want some inputs on how make it work for my car.

My goals for the turbo is about 38~42 lbs/min flow
The lowest lag possible on a HX40 (im not looking for HP here so sacrifice peak HP for lower lag is very welcome)

I will make this change because i get tired of turbos dying pretty soon (just 21psi at 7124 ft altitude), so wanted a more low octane gas friendly turbo, and also a turbo that can flow and last. Mostly a turbo that can last long!

So a bep .55 will be the best choice or maybe a divided manifold? or something else? I can get a divided manifold more easily btw....

I really looked at old post, but seems old the post are looking for maximum flow and trying to sacrifice the less spool time. So seems they are a very different approach..

I appreciate any help

red_devil · May 27, 2017

If you want quick spool and less than 42lb/min then why not just go evo3 or FP68?

No matter what you do a hx40 won't start moving some real air until 4k rpm. And the .55 isn't exactly pump gas friendly past 25psi. Depends on what your goal here actually is..

TAMA_player · May 27, 2017

My goal is to maintain low boost. To help with turbo longevity and also make it more pump gas friendly.
Actually if that 4K rpm is real, sounds like very good news to me! Is exactly the spool time i was looking for. I've seen lots of dyno sheets with late 5k or late 6k spool times. And that's not good.

Right now i have a big16g but its being pushed hard. And it needs rebuilds. More than my patience permits

And also this year i want a little more power. And the little turbo seems will not hold it.

19gsx91 · May 27, 2017

From what I''ve read from other peoples setups Quick spool and Hx40 don't really play nice together unless your in the restrictive .ar housing and Twin scroll.. @1990TSIAWDTALON didn't you just break a turbine running an hx40 in the smallest available bolt on housing?

If you were asking 50lbs/min I'd say sure.. but 38-42?! I'm logging 47lbs/min and hit 20psi at 3600 and 25 at 4k in my v168hta. Seems a waste of ann HX40 to me.

boostdawd · May 27, 2017

Twinscroll divided manifold with stock 12cm holset housing should give u the quickest spool. If u don't care about big hp but spool than an hy35 may better suit ur needs.

TAMA_player · May 27, 2017

boostdawd said:
Twinscroll divided manifold with stock 12cm holset housing should give u the quickest spool. If u don't care about big hp but spool than an hy35 may better suit ur needs.

So stock divided housing, mated with a divided manifold will give me the best spool up? right?
In fact that is the easy route i can get. Get another housing will cost me more $$$ than making a custom mainfold.
Please confirm this.

lasershark · May 27, 2017

TAMA_player said:
Get another housing will cost me more $$$ than making a custom mainfold.

Unless you can make the manifold yourself... twin scroll mani's are some serious coin! easily $900+, with such low airflow goals I would also recommend getting a smaller turbo more suited to your goals.

boostdawd · May 27, 2017

Twinscroll manifold is about 900. Plus u need dual wastegates which is another 550-600 bucks.

boostdawd · May 27, 2017

May be more cost effective to get an hy35 and t3 manifold.

I have a twinscroll t3 hx35 right now but the build is still coming along. Should be ready by this fall.

19gsx91 · May 27, 2017

boostdawd said:
I have a twinscroll t3 hx35 right now but the build is still coming along. Should be ready by this fall.

Well get to it! My transmission will be in before you finish your car!

TAMA_player · May 27, 2017

lasershark said:
Unless you can make the manifold yourself... twin scroll mani's are some serious coin! easily $900+, with such low airflow goals I would also recommend getting a smaller turbo more suited to your goals.

The car is in Mexico. Territory of the cheap Custom Fabrications. I just measured myself a manifold gasket that almost was be put by in Solid Works for the machine works to will put me a head flange to spec in the cheap. And as soon as i get in my door the HX40 i will be making the same solid works drawing for the twin scroll flange and wastage. It will be machined by the en of the week by cheap. And my the muffler guy will be bending tubes and soldering and making the manifold. also in the cheap. Again It is Mexico territory of the cheap Custom Fabrications.

So if custom twin scroll is the best for low lag. It will be cheaper than a 16g. And i currently have a 16g

I just need to know what to do. Twin scroll manifold or purchase a housing. Seems making a twin scroll manifold and stock divided housing is the way to go? as far as two thread responses?

Please guide me in the right direction.

Archer Fabrications · May 27, 2017

I had the hx40 60mm on the .55 bep housing saw spool by around 4k. At 21psi i managed 398whp on english racing's dyno. Had it up to 30psi on 94 pump gas. But it gets a little sketchy with 91/92octane at 27psi as far as knock goes.

Also I'm going to be making a stock replacement manifold soon thag will spool quick and have good flow, it is a smaller runner then the others to aid in a street friendly setup.

TAMA_player · May 27, 2017

Archer Fabrications said:
I had the hx40 60mm on the .55 bep housing saw spool by around 4k. At 21psi i managed 398whp on english racing's dyno. Had it up to 30psi on 94 pump gas. But it gets a little sketchy with 91/92octane at 27psi as far as knock goes.

Also I'm going to be making a stock replacement manifold soon thag will spool quick and have good flow, it is a smaller runner then the others to aid in a street friendly setup.

If you can make a manifold thats will be great for the DSM comunity. Because, maybe in mexico is cheap to make a manifold, but ensure it is optimum, thats not cheap, and granted people better will be saving the money to buy the sure thing.

boostdawd · May 27, 2017

19gsx91 said:
Well get to it! My transmission will be in before you finish your car!

I'm taking tranny donations Lol. Blew up my output pinion shaft and collecting parts for a rebuild or maybe getting another trans.

@bastarddsm ran a true divided housing but saw slow spool time. The runners and pipe type have a lot to do with how well the exhaust will be moved to spin the turbine.

19gsx91 · May 27, 2017

There is a 1g AWD trans for sale on eastern NC craigslist for 200 right now? LOL

1990TSIAWDTALON · May 27, 2017

19gsx91 said:
From what I''ve read from other peoples setups Quick spool and Hx40 don't really play nice together unless your in the restrictive .ar housing and Twin scroll.. @1990TSIAWDTALON didn't you just break a turbine running an hx40 in the smallest available bolt on housing?

If you were asking 50lbs/min I'd say sure.. but 38-42?! I'm logging 47lbs/min and hit 20psi at 3600 and 25 at 4k in my v168hta. Seems a waste of ann HX40 to me.

Yeh, I've broke two. One sheared off the exducer clean the other was utter carnage. It needed a bigger housing with what I was doing and putting it through. She's been playing nice so far with a .70 T3 setup. I don't see full boost until around 47-4800 so you either pick the right gear or wait on the turbo.

AdR · May 28, 2017

I understand wanting lower boost and the same amount of power, more if you're from a hot environment where knock is ever present. But it has been discussed a few times that the HX40 with the BEP 55AR housing is not recommended. Couldn't you achieve your goals with an HX35 instead? You'd get fast spooling like the big 16G and the equal amount of power at lower boost pressures.

91talonts1 · May 28, 2017

The altitude will probably make the HX40 in the.55 even worse. I second the HX35, should reach your airflow goals even that high up, and spools very quickly in the .55.

ceedawg · May 28, 2017

I'd go hx35 or 40 and stock holset 12 or 14 cm ts housing. That was a great suggestion by someone here. Then get ArcherFab to make you a ts Mani and done. Only thing is like someone mentioned the wastegates will cost you. Economic way just get a .70 open t3 hsing. Get T3 open housing Mani from Archer Fab.
Hx40 in a 55 turn housing means certain turbo death. You'll be buying another turbo in no time.

94allwheeldsm · May 28, 2017

I have a T/S manifold with 1.5 runners, 6 blade hx40 in the t3 18cm housing...i don't have access to my laptop at the moment but it spool ridiculously fast. Once it it's 5 psi, 30 psi is there like right now. When I get the garage I'll post some real info.

1990TSIAWDTALON · May 28, 2017

94allwheeldsm said:
I have a T/S manifold with 1.5 runners, 6 blade hx40 in the t3 18cm housing...i don't have access to my laptop at the moment but it spool ridiculously fast. Once it it's 5 psi, 30 psi is there like right now. When I get the garage I'll post some real info.

A 35 will work for most and there aren't the problems that come with the 40 in a .55. My spool doesn't wait, once it sees 5psi, it sees 40 with in about a second. It is a hard hit.

94allwheeldsm · May 28, 2017

Before this setup I had an FP manifold, bep. 55, 7 blade hx35, bc 272s....that was the best Dailey driven setup I had. No wait for boost.
I prefer the hx40 twinscroll though....

19gsx91 · May 28, 2017

94allwheeldsm said:
Before this setup I had an FP manifold, bep. 55, 7 blade hx35, bc 272s....that was the best Dailey driven setup I had. No wait for boost.
I prefer the hx40 twinscroll though....

Why is that? I'm curious as to what your fitment was like with the HX35 in the BEP housing

94allwheeldsm · May 28, 2017

Had to dent water pipe some. The 40 pulls so much f*cking harder(obviously) at the same boost and spools just about the same.

TAMA_player · May 28, 2017

94allwheeldsm said:
Before this setup I had an FP manifold, bep. 55, 7 blade hx35, bc 272s....that was the best Dailey driven setup I had. No wait for boost.
I prefer the hx40 twinscroll though....

Thank you for your first hand experience. That give me hopes.

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Recommendations to low lag Hx40

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