13ALPHA

Just wondering, would this combo work? Or would I need a smaller turbo than the HX? I am getting interested, I have the HX laying around and the HTT on...

92ford

That combo would not work well. The 62 would be a good start to a set of twins. If you were to add an s400 or a ht3b to it that would be a good set IMHO.

Fishin2Deep4U

Or the HX35 could also be used on top. S400 for bigger power, Gt42 for a bit less and K31 (big wheels) for a bit less still.

Dave

13ALPHA

I can't seem to find a clear explanation , the smaller, quicker to spool, turbo is the primary? Then you have the larger secondary turbo? Air flows through the primary first, putting compressed air into the secondary?

And you're saying the HTT would work as which? I thought because it spools a little slower (and seems big to me, that may be just me though) it would be the bigger of the two and I needed a small (s400<HX35?) turbo? Thanks for the info, so much knowledge here.

12valvesmoke

the smaller quicker to spool turbo is the secondary. the primary is what the bottom turbo that takes in the air first. the htt would be your top turbo. the turbo that the exhaust goes to first and the air goes to second after being compressed by the primary on the botton.. with those two smallish turbos you would just be setting your truck up for a blown head gasket. you would need to get a bigger turbo.

type in twin turbo cummins 5.9 into google then go to pictures and there are some pretty good views of how it works. just remember that the intake goes to the big turbo first

13ALPHA

Thanks, so I need a "bigger" turbo...

12valvesmoke

yes... i dunno much about turbo sizes and names and all those shinanigans but i know how they work. if you did try to make that twin setup i would prepare for insane boost insanly fast... meaning head gasket and studs.

if you do do it pm me some info on it i have the same delima my low mile stocker is just sitting there staring at me haha

Jared

13ALPHA

So, are the properties of each turbo full additive? You say it would be really high boost, is that just because both sort of light at the same time? In a properly paired set they spool not at the same time so the boost doesn't get that high?

I have the HTT still set at what it came from the shop with, ~40 psi. Would an extra 5psi (aiming for 45psi) make any noticeable difference in performance?

Canadian24v

That set-up works great if you use HE341 or HY-35. I ran this on my first gen made 55 psi with stock headbolts and couldn't get over 1100F check out the link. https://www.dieseltruckresource.com/...archid=2870448 It spooled faster than a single HX-35.

97 D-Tec

a hx-35/ with a 62 imo would be weak sauce for twins. u might as well keep the single if your going to do that because thats 2 primarys spooling and no top end (big secondary)charger. Twins are ment to have a small charger like a 62. this chargers supposed to spool up first and then this pressure hits the larger charger like a ht3b or k21. which means u get the quick spool of the smaller charger with the air of a big charger with out the lag.

RowJ

No. With your fueling level, it would do nothing extra.
Unless adding more fuel, the HX-35 on top would work well with a S400 on the bottom. Finished or unfinished kits are available HERE.

RJ

GLHS

Your hx35 and 62/71 combo is pretty close to BD's "towing twins".

RowJ

Not hardly, IMO.
HX-35 has a 54 mm compressor blade
The Super B (BD top turbo) is a 58 mm compressor.
BD's primary turbo is a 66 mm Compressor with a big 77 turbine blade and an A/R ratio of 1.10 (similar to S400).

RJ

GLHS

If you are correct, that's not quite as close as I thought.
A BD rep told me personally the little turbo had a 57 mm inducer and the bottom turbo was a Super B "Special" 64/71/14.

RowJ

Nope. I personally measured my primary compressor and turbine wheels and they are 66mm and 77 mm... respectively.
I'm taking their word for it that the A/R ratio is 1.10... that math is over my head.

And it's my understanding (from BD's turbo shop mgr) that the Super B Special is a Super B with a 16cm2 housing.

RJ