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Holset turbos in 2023

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habitatguy187

15+ Year Contributor
3,635
253
Aug 20, 2008
Indianapolis, Indiana
Holsets used to be THE thing to do for awhile in the dsm scene. Just wondering what everyone’s stance is on that in 2023 with more and more turbo options becoming available? To be honest, I’m still interested in an hy-35 in the smaller t3 housing but I’d like to hear some opinions of others.
 
Holsets used to be THE thing to do for awhile in the dsm scene. Just wondering what everyone’s stance is on that in 2023 with more and more turbo options becoming available? To be honest, I’m still interested in an hy-35 in the smaller t3 housing but I’d like to hear some opinions of others.
I am still on a 7-Blade HX35 with the factory 12cm twin scroll T3 housing. It works great and the car is super fun for autocross, highway pulls, and just cruising around. The availability of repair parts and the performance per dollar is still good I'd say.

That being said, I'd be lying if I wasn't intrigued with swapping to a TS T3 GTX Gen 2 or go to V-Band and grab a G Series/EFR. Modern aero+ball bearing seems like it could be fun. But the cost barrier is pretty high and the car making boost earlier just strains the drivetrain more than it already is.

I think for 95%+ of people a Holset is still going to fit their power curve needs just fine and and do it at a much lower cost. The lack of readily available bolt on housings will start to change the math some. But there are plenty of aftermarket manifolds if you find a holset with the factory housings.
 
Holsets are one of the best budget turbos out there, people still rock them out. My brother just purchased an HX35 for his 4G swapped 3KGT.
 
I’ve still never ridden in a holset-powered 4g. I know that I’m hating the spool characteristics of this old school fp green I’ve got now.
Attached a set of graphs for HP/TRQ for my FP Race Manifold + TD06SL2 20G vs. 7 Blade HX 35, 12cm TS T3 housing, MF TS T3 Manifold. This was same dyno, same tuner, same engine/cam/intake manifold combo. The TD06SL2 20G is roughly the same as an FP Green. Full boost (28ish) doesn't occur until the mid 4k range on the Holset setup but it clearly carries way better up top with the T3 and the power down low is still improved. The car feels like a "big" turbo car with the boost ramp but it pulls nicely even down low as boost is still building. Not the same as riding in a car but maybe this helps some.

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Holset’s are still a good selection depending on the user’s goals, the problem is they caught on with ours and other platforms and it drove the prices up combined with certain turbine housings being much harder to obtain now that those housings are out of production. In the late 2000’s when they blew up they were throw away stock turbos to the diesel community that were taking them off their trucks to upgrade, meaning we could buy them in functioning order for 100 bucks or so, have it serviced for 200ish bucks for reassurance, buy a desired turbine housing for another 200 bucks, and have a super reliable turbo that made power similar to units that cost double and triple what you had into it. In todays age a lot of the hx35’s and 40’s and such I see pulled off trucks are nothing I would consider anything more than a buildable core and bring 250 bucks, combined with 400ish bucks to get it serviced and at least $200 to buy a turbine housing (more for the bolt on units and the .70 t3 bep isn’t exactly easy to come by either) that’s well matched to the set up, at that point in many’s eyes it makes more sense to spend a little less on one of the Chinese 3582 or 3076 companies like Pulsar and FP are offering that is a brand new turbo that outperforms the Holset. While they may not be quite as reliable, most people don’t keep turbo set ups long enough for it to matter as those seem to be doing quite well for what they are.

Not saying that takes away from the Holset’s, still great units with great performance for the dollar. Just explains why you’ve seen that popularity fall off. The hy35 as you mentioned is still a badass turbo for its class, the problem being theyre specific to only a few years and options on a much older Cummins platform it’s gotten hard to come by an hy35 that’s worth working with.
 
I am a avid Holset HX40 guy. They will run 40lbs of boost and never flinch, although I do have an FP 3582 also, which technically, is 2mm larger than the Super 6 6 blade that is 60mm where the FP is 62. I saw Kevin Jewers review of the FP unit and he was really surprised by it and it was very reasonable, price wise. My HX40 is laggy but when she lights, GD, she runs GREAT. My HX40 7 blade on my car comes in around 4500 and flows great for me up to 9200+. Holset has an 8 blade HX40 that spools sooner but it is a little smaller than 60, 58mm IIRC. I ran one for a while, and in a "street" car it is more fun than the 7 blade or the Super 6 6 blade.
Just my .02 cents.
Love my Holset but the FP is another good option.
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My he351 went 9s back in 2017 in a 3300lb DSM. Don't see much else going that fast with a 60mm inducer in a heavy car. I'd like to try a new pte or 62 just to see how they compare power wise.
It went 9s, but was it any fun on the street? Did it spool anything like these new uhf turbos are supposed to? After further research I may just want a hta68 v1.

Holsets are intriguing but making a new o2 housing is not.
 
Idk, never wanted to contaminate my car with that stuff. I would say it came on pretty quick for a 700whp setup, i made it laggier to kill some torque and try to keep the trans happier. The HY35 was a lot more responsive, but ya know 100whp less. Packages way easier too. I ran both on a turbonetics manifold, and I'm sure that gave up a lot of response over a nice small runner tube manifold. Just like a stock location deal is gonna do as well.
 
I don't own a dsm (not from USA) but I use holset hx35/hx40s, which imo still arguably best value for money turbo, assuming going to t3/t4 twin scroll manifold, for these reasons below.
Most hx35/40 already have t3/t4 twin scroll housing, which in my experience has most influence in quick spool/response and wider powerband. With most other turbos must purchase twin scroll housing separately with prices not much above whole hx35/40 turbo.
New hx35/40 and their newer designations like he351w (not cw, he351w has 12cm t3 twin scroll housing) are available from web shops in USA, Euro, Aussie, NZ, Asia, with prices competitive (usually cheaper) compared to newer high performance journal bearing turbos like borg s252/257sxe, garrett gbc35-700.
Competitive max flow based on compressor map :
54mm 7 bladed hx/hy35 maxed at 57.5 lb/min outflows s252sxe.
58mm 7 bladed he351w maxed at 66 lb/min outflows s257sxe, efr7670, gtx30/3576r gen 2.
60mm 7 bladed hx40 maxed at 70 lb/min outflows gbc35-700.
Hx35/40/he341w are cheap and easy to rebuild or upgrade (up to 67mm compressor and turbine, so should be competitive with s366sxe or gbc37-900).
Here is USA webshop selling hx35/40/he351w :
 
OP, I am glad you posted on this subject. I picked up my 3rd DSM back in July, been out of the DSM game for about 10 years. I'm older, smarter and wanting to build my car right. My goals is a 500whp + e85 car. Been looking at the HX-35 or HY setup. Of coarse I plan to work with JusTurbo's to build me the turbo hopefully. I had an HX-40 before on a 91 pump gas tune, made just over 450whp with DacowGod/Rix Racing as my tuner. So, i've been looking at this for months trying to decide what I want to get turbo wise.
 
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