The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support Rix Racing
Please Support STM Tuned

Holset Turbos, PART 7

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Status
Not open for further replies.
Does anyone have a list of the holset turbine housings in cm converted to a/r? or is there a formula of some sort? May be going a different route now and I am looking for a twin scroll T3 Holset turbine housing that is about .82 a/r. Also does anyone know if there are any somewhat small T4 holset housings?

The smallest divided T4 housing that I know of 16cm which is pretty close to 0.83 A/R which I had a lot of trouble fitting it on a bottom mount manifold. So be pretty happy you found an .82 A/R divided T3 cause that's probably the smallest you'll find.

Holset doesn't make small housing. They are for diesel trucks and semis. But if you're wanting to find smaller divided housing and need to know the cm to a/r equivalences it did mention them in past Holset threads.
 
He didn't find one he's lookin for info on one that siZe
 
Since the Holset thread seems to be so popular witht eh 7 seperate threads and 3xxx posts, a lot of stuff gets asked and repeated. I think it would be wise to make a general Hoslet turbo FAQ. All numbers listed for each turbo model and year of the modle that it was available on. It would cut down on the amount of questions asked and lower the size of these threads. What kind of oiling system to go with, exhaust manifold, which hotside housing (.55, .70, etc) reasons and benefits to each, major differnece to the 35, 40, H1. If this was attempeted already then I'll delete this post but as I said, a general FAQ for the Holset would be great. Setup like how the Newb section with the general FAQ. Any one with that idea?
 
He didn't find one he's lookin for info on one that siZe

I quoted Kevin_TSI post, he was asking for more than that, like if there was any smaller divided T4 housing compared to his 0.82 a/r.


Since the Holset thread seems to be so popular witht eh 7 seperate threads and 3xxx posts, a lot of stuff gets asked and repeated. I think it would be wise to make a general Hoslet turbo FAQ. All numbers listed for each turbo model and year of the modle that it was available on. It would cut down on the amount of questions asked and lower the size of these threads. What kind of oiling system to go with, exhaust manifold, which hotside housing (.55, .70, etc) reasons and benefits to each, major differnece to the 35, 40, H1. If this was attempeted already then I'll delete this post but as I said, a general FAQ for the Holset would be great. Setup like how the Newb section with the general FAQ. Any one with that idea?

It wouldn't hurt to Google cm^2 to A/R.

Here is the equivalences:

9cm^2 - .48 A/R
12cm^2 - .63 A/R
16cm^2 - .83 A/R
18cm^2 - 1.00 A/R
22cm^2 - 1.15 A/R
 
Yes, that's good, but have ALL the info compressed into a simple FAQ for people to go over instead of skimming over hundreds of posts looking for info.

I don't need the info personally right now, but come the time it would be nice to look at a single page to be directed to other pages OR look at that page and find most if not all the info I needed.
 
Yes, that's good, but have ALL the info compressed into a simple FAQ for people to go over instead of skimming over hundreds of posts looking for info.

I don't need the info personally right now, but come the time it would be nice to look at a single page to be directed to other pages OR look at that page and find most if not all the info I needed.

Right, if you want that to happen just PM Ludachris who takes care of DSMTuners, but I sure he'll laugh it off. Holset it really a big thing in the DSM world compare to the truck world which you'll most likely find your answers there.
 
See, that's just it. Yes you may find yout answers on the Cummins forum, but how many people are actually going to go and sign up over there to find some info when it's all here already? My idea is to make it simple and easy and would take the 7 pages down to 2 or 3 or 4. Either way it would be a lot less than the 7 and everything would be compressed into a simple click on link and recieve anser deal :thumb:

REAL eggnog is freaking awesom btw! Yeah...I had to call off work this morning..
 
Last edited:
See, that's just it. Yes you may find yout answers on the Cummins forum, but how many people are actually going to go and sign up over there to find some info when it's all here already? My idea is to make it simple and easy and would take the 7 pages down to 2 or 3 or 4. Either way it would be a lot less than the 7 and everything would be compressed into a simple click on link and recieve anser deal :thumb:

REAL eggnog is freaking awesom btw!

I agree I have been following these posts for quite some time now and when I want to find a certain post or answer it is almost impossible without going back through 5000 replies, because lets face it the search function works but doesn't direct you right to the exact spot for what you are looking for but just the thread itself. I don't have much to do right now so maybe I'll start to put something together.
 
Deffinatly keep these threads going for the discussion, but any and all hard facts and ideas to be used get sorted and orginized into a new Holset FAQ that has a much easier function to get the info required.
 
Actually going back through some of the other holset threads Morphius summarizes the important parts of each thread by what page it is on and what topic was talked about. So in a way it is setup up. If you look that is why his 2-4 post on this thread are left blank.
It would be nice to have a main faq but someone will have to do it, I'm still gonna look at doing it but for now it is atleast summarized.
 
WTF
I quoted Kevin_TSI post, he was asking for more than that, like if there was any smaller divided T4 housing compared to his 0.82 a/r.




It wouldn't hurt to Google cm^2 to A/R.

Here is the equivalences:

9cm^2 - .48 A/R
12cm^2 - .63 A/R
16cm^2 - .83 A/R
18cm^2 - 1.00 A/R
22cm^2 - 1.15 A/R

Nope. Those numbers are a bit off. There was no answer given because there is no real way to cross turbine housing measurements across even differnt framse sizes (see .58 a/r t4 vs. .63 a/r t3), much less across brands.

Also with a 18cm^2 holset turbine housing the individual critical areas are about as large as the .63 critical area of a garrett. With a divided runner manifold, then spool will be about the same or faster for the MUCH larger 18cm^2 housing. Though there will be a bit more flow.
 
WTF

Nope. Those numbers are a bit off. There was no answer given because there is no real way to cross turbine housing measurements across even differnt framse sizes (see .58 a/r t4 vs. .63 a/r t3), much less across brands.

Also with a 18cm^2 holset turbine housing the individual critical areas are about as large as the .63 critical area of a garrett. With a divided runner manifold, then spool will be about the same or faster for the MUCH larger 18cm^2 housing. Though there will be a bit more flow.

Hey do you know which Holsets came with the divided housings?

I mean what year of Dodge truck? And also what years did the 8 blade hx40's come on and which ones were the billet wheels?
 
ALL holsets up to 2004. . . I think. If I'm wrong then up to an even later date. ALL hx35s H1Cs hx40s. Except the hy35 (on autos from 1998-2004) were twinscroll.

Hx40s don't come on pickups. They are an upgrade. They come on larger motors.
 
ALL holsets up to 2004. . . I think. If I'm wrong then up to an even later date. ALL hx35s H1Cs hx40s. Except the hy35 (on autos from 1998-2004) were twinscroll.

Hx40s don't come on pickups. They are an upgrade. They come on larger motors.

Ok thanks for clearing that up.

One more thing, and I wanted to ask you directly dsm-onster, do you know the part number for an hx40 8 blade? My friend works at Cummins and can get me an HX40, but need to give him a part number, specifically the 8 blade wheel.
 
Actually going back through some of the other holset threads Morphius summarizes the important parts of each thread by what page it is on and what topic was talked about. So in a way it is setup up. If you look that is why his 2-4 post on this thread are left blank.
It would be nice to have a main faq but someone will have to do it, I'm still gonna look at doing it but for now it is atleast summarized.

True, my intent is to try and summarize all posts in the thread with a short note in the first couple posts in the thread. However, I've haven't got it done yet and hopefully with winter coming around, I'll have more time to do this.

Until then, if you visit the first post in this thread (or the first post of most the threads), there is a general summary and links to shorter threads that discuss/summarize things such as part #'s and oiling. The results thread has a good listing of current users of Holsets and their particular setup. Only thing I could think that each of those people could add is detail on the oil lines used and what they use for an oil source. I'm sure if you asked politely, any one of those Results thread posters would gladly add that info into their post to share with the community.

Maybe somewhere down the road, I might try a condensed FAQ of sorts that will summarize the discussion threads on oiling, etc.
 
WTF

Nope. Those numbers are a bit off. There was no answer given because there is no real way to cross turbine housing measurements across even differnt framse sizes (see .58 a/r t4 vs. .63 a/r t3), much less across brands.

Also with a 18cm^2 holset turbine housing the individual critical areas are about as large as the .63 critical area of a garrett. With a divided runner manifold, then spool will be about the same or faster for the MUCH larger 18cm^2 housing. Though there will be a bit more flow.

Sorry I got kind of lost with this. I was hoping you could clear it up. So are you saying that with a twin scroll manifold the spool on a 16cm or 18cm would be good or bad. I am torn between a machined 14cm, 16cm, or 18cm. The car is for drag racing and i'm looking to make some nice power but still maintain a fairly quick spool. Thats why I was hoping to find the a/r. Also I was looking for a T4 because I might be getting a divided t4 to replace our current T3.
 
Sorry I got kind of lost with this. I was hoping you could clear it up. So are you saying that with a twin scroll manifold the spool on a 16cm or 18cm would be good or bad. I am torn between a machined 14cm, 16cm, or 18cm. The car is for drag racing and i'm looking to make some nice power but still maintain a fairly quick spool. Thats why I was hoping to find the a/r. Also I was looking for a T4 because I might be getting a divided t4 to replace our current T3.

Dsm-onter was saying that the divided 18cm^2 is comparable to the .63 A/R Garrett housing and it would spool just the same or faster yet flow more. In other word, if you use a twin scroll manifold with a divided housing it'll spool just as fast as the .63 A/R Garrett housing but flow more which could lead to more power depend on which Garrett turbine you're compare it to.

As for your decision with which size to go with, the small spools faster but doesn't flow as much so you're giving up power that can be made for faster spooling. Although, just for reference my HX52 with a divided 16cm^2 T4 housing and twin scroll setup spool pretty damn fast. It gets 20 psi at about 4.5k rpm.
 
Since the Holset thread seems to be so popular witht eh 7 seperate threads and 3xxx posts, a lot of stuff gets asked and repeated. I think it would be wise to make a general Hoslet turbo FAQ. All numbers listed for each turbo model and year of the modle that it was available on. It would cut down on the amount of questions asked and lower the size of these threads. What kind of oiling system to go with, exhaust manifold, which hotside housing (.55, .70, etc) reasons and benefits to each, major differnece to the 35, 40, H1. If this was attempeted already then I'll delete this post but as I said, a general FAQ for the Holset would be great. Setup like how the Newb section with the general FAQ. Any one with that idea?
I agree with you.. That's something I've mentioned to some of the guys that seem to know alot about this turbos but no one took it seriously.
 
Yes, that's good, but have ALL the info compressed into a simple FAQ for people to go over instead of skimming over hundreds of posts looking for info.

I don't need the info personally right now, but come the time it would be nice to look at a single page to be directed to other pages OR look at that page and find most if not all the info I needed.

Please read post 165 here. (Goes for the other newbs to the thread too.)
 
Here is a little sneak peak of our setup for next year guys. Ended up getting a twin scroll manifold (still needs wastegate flanges welded on), twin scroll 18cm hot side HX40. Enjoy and expect some fast times I hope! Hoping to be the first to lay down some good 1/4 numbers with the hx40 since I can't seem to find many.
You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.
 
Nice looking setup Kevin. You'll need to beat 10.8sec at 134mph. But, there's a 139mph speed out there with the lower flowing 8blade hx40. That's the fastest I know of. . . so far.
 
Thank you. The manifold was made by MFGracing. We swapped our T3 top mount for it. We have the ability to make our own manifolds but unfortunately no TIG welder. Soon though haha.
 
Status
Not open for further replies.
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top