HOHN

I managed to find a compressor map for an HX60 variant today.

With this variant (980 compressor), it's on the map at over 4.4PR, and will flow well over 110 lb/min.

So, this turbo is affordable, high PR capable, has a wastegated housing available, and is overall a VERY strong candidate as a twins primary. It would work well with a 62mm S300 on top.

I'm trying to see if Cummins has an employee purchase program that would allow me to pick one up cheap someday.


Also interesting was tech report I dug up showing mpg and other improvements just by switching to an HX60 from an HT60.

Newer generation turbos really are much more advanced than the older ones.

I want to see if I can dig up info on the latest and greatest on the much-vaunted HE series. Like, can you get one without all that VGT stuff and such..

JH

Fishin2Deep4U

Where's the map Justin?

And what does the turbine section look like?

Dave

HOHN

The map is safely located on the Cummins servers, protected by a NDA that I signed on my first day of employment.


Let's just say it looks like a GT4202 map, only shifted to the right about 30#/min with bigger efficiency islands.

This is probably the best street/strip primary of come across yet on paper-- it's perfect for the high HP guy who still wants to tow. The wastegated housing is a huge plus, imo.

At the price they go for, I'd say a bargain is to be had. Compared to a JB 4202, this will make more power and cost less. But a 4202 will spool earlier while being less efficient. The HX60 should have lower TIP and comp discharge temps, too.

jmo (see sig)

PaulDaisy

Twins...
Maybe THAT is what I need to be thinking about, driving and towing in thin air and as much as I dislike making any smoke at all... So, which one would be faster that HX35 for the top one to go nicely together with the 60?

Fishin2Deep4U

HX35 just chokes too quickly if you are going for any big power. It can be run with an external gate to help, but it just does not work that well.

A smaller primary with an HX35 would give great spool and limit HP to 500 or less. Bigger primary and you can extend that HP range at the expense of staging.


Justin, I had to try!!!



Dave

HOHN

Paul, in thin air, I'd go with a smaller primary than the HX60 to go with the HX35. The 60 is too big to match the 35 very well.

I'd suggest a rather small primary with a tight housing- like a GT4294 or 4202 with the 1.15 housing. THey have journal bearing versions of these that don't cost a fortune like the BB ones do.

Twins with the 35 on top aren't for big power. They are for utility and EGT control up to 450hp or so.

JMO

Erska

So hx 35 with changed 14cm exhaust housing is not enough for 600rwhp with big primary?
Like second stage Borg Warner S4 series turbo?

How big is a "second series" S4 turbo? Is that the same turbo than schwitzer s400?

I really dis-like shops turbo listings because of the lack of details! It just does not tell you anything if someone is selling a modified hyper-super stage 2 turbo....

HOHN

The HX35 in a set of twins has been taken over 700hp. But it's not very effective and quite a crude arrangement-- not at all the right tool for the job.

jmo

Fishin2Deep4U

And those probably have been housing and or externally gated correct?

I don't think you can get enough volume with the internal gate. But still impressive to say the least!

Dave

HOHN

Yes, the twins set that did that was Jim Fulmer's 12V with am 18.5 housing on top, and I'm not sure if a gate was used (I'm tempted to say yes).

Needless to say, Jim's twins are a little bit different these days

2141pete

This might be what i need to make a home brew upgrade for my BD twins then huh?

Mike Holmen

Hohn, is the 60 available in VGT? That would be a sweet primary turbo. It shouldn't be to hard to get to work. Use a BB garrett for the secondary. Any ideas on approximate price yet? Last time I looked at a VGT turbo, it made the garrett look cheap.

HOHN

The newest turbo to look at in this size range from Holset would be the HE531. The VGT version is HE531V.

In the OEM config, the VGT actuator is ECM controlled on a 24V circuit.

There are a LOT of different configurations with Holset turbos, including this one. You can get wastegated and non wastegated housings. VGT or not. Titanium compressor wheel, MFS (machined from solid-- basically billet), and regular cast AL, water cooled bearing housings or not, and at least two different compressor wheels.

Even a non-VGT HE531 would be a super sweet primary because the newest Holset turbines and compressor wheels are *the* state of the art in turbocharger world. The Cummins turbo business (holset) is booming as other manufacturers are turning to Holset chargers-- I've heard even CAT was running some Holsets in some cases!

I'll try to dig up a part number for an HE531 variant, but I've not had any luck thus far. So far, it's been a "spare time" work project, and new guys have very little spare time.

Justin

HOHN

Oh, and here's the part number I have for the HX60 with the larger 980C compressor: 4024855NX

I think it has the bigger compressor, anyway.

Tate

The VGT versions, are they all electronic, or are there pneumatic versions of them as well?