I got a turbo from @CSM and I went ahead and got it pulled down to rebuild it. While its apart I figure I would measure out the turbine and compressor wheels. Here is what I got. 

 

Compressor 

Inducer 60mm

Exducer 83mm

 

Turbine

Exducer 60mm

Inducer 69mm

 

From what I found online this is a HX40 compressor wheel. The HX35W is 56mm compressor wheel. So this should be a rather nice boost (pun intended). Waiting for my bearing kit to come.

Edited April 6, 20178 yr by Mopar1973Man

I've always been curious what drive pressure is with a hybrid like that.  You've got a tight twin scroll 12cm housing with a small straight blade 60mm turbine.  The he351's do pretty decent, but they've got a curved blade and a single scroll turbine housing.  Speculations.  Unless, someone were to measure it.... ????? lol

Lower cruise boost is a good thing, imho. 

 

40 psi with added timing is the number I'd be watching with stock head bolts, and that's with stock stocks. 

 

Since you increased exhaust flow its likely you are moving more air with the same boost pressure.... meaning 40 psi now could be similar to 43 psi with a stock turbine. It's hard to say how much, but it's good either way. 

Basically that what it looks like. So, that would be a curved blade wouldn't it?

11 minutes ago, Mopar1973Man said:

Basically that what it looks like. So, that would be a curved blade wouldn't it?

 

I consider that a curved blade...??

 

it also shows why your post 1 turbine labels are backwards. Inducer is bigger on the turbine. 

 

 

I'm sure the CR timing has a little to do with it, but I'd never call the drive pressure on a HE351 descent. 2:1 is super easy to get. 

Edited March 23, 20178 yr by AH64ID

Ok so I'm backwards... Corrected now...

 

Compressor 

Inducer 60mm

Exducer 83mm

 

Turbine

Inducer 69mm

Exducer 60mm

 

So it would be a 60/69/12 then right?

No, they measure turbine wheels by the exducer.  So it would be a 60/60/12.  

60/60/12, so very similar to a HE351 with a larger turbine housing which is a 60/60/9 by most accounts.  

Edited March 23, 20178 yr by AH64ID

So just the labeling was wrong but the measurement was right. 

22 minutes ago, AH64ID said:

26 minutes ago, Mopar1973Man said:

 

I consider that a curved blade...??

Yes, that is a curved blade.  Helps spool quicker, especially when using a twin scroll housing, like the one found on the 12cm HX35's

 

Yes, but words mean things..... I only had to mention it twice for you to notice :-) 

11 minutes ago, Mopar1973Man said:

So just the labeling was wrong but the measurement was right. 

Exactly.

 

Edited March 23, 20178 yr by trreed

I forgot these were in the garage. 

 

Stock HE351 wheels. I don't have any calipers handy. My reloading stuff is packed away. 

 

 

1 hour ago, Mopar1973Man said:

Basically that what it looks like. So, that would be a curved blade wouldn't it?

 

Yes the blades are curved, but in todays turbos that's referred to as a straight blade turbine.  The inducer side of the fins are parallel with the shaft.  Looking at AH64ID's HE351 pictures above, you can see the the inducer part of the blades are curved.

 

The straight blades make more turbulence which helps with spooling, but limits top end do to increasing the restriction.

 

I could never keep the inducer/exducer straight either till the obvious hit me like a brick.

Inducer = Intake side of the wheel.  Excuder = exhaust side of the wheel.

 

 

The HE351 is actually a 60/58/9.  Somehow they've managed to take a crumby HY35, redesign the turbine housing and compressor wheel, and turn it into one of the best sub 500hp options to date... 

 

The Stock HX35 Turbine wheel specs at a 60/70mm, but the inducer typically measures a little shy of 70mm, so it sound like you've got a stock HX35 turbine.

 

Edited March 23, 20178 yr by Cowboy

I need to measure that wheel I have. I've heard 58 from several sources but Holset told me 68x60 on the phone. 

Please do!  I'm curious what you find.  If yours is a 60mm, you'd be the first out of a dozen or so people I've talked to that measured one and got that number.  If you're familiar with Will at PDD, I talked with him and he said that he's measured dozens and only ever got 58.

 

I personally sat down with a HY35, HE341, and HE351CW, took the turbine out of each of them, sat them side by side and they were all identical, probably have the same part number.

 

 

 

I've always wondered where the 60mm thing came about, I must have been Holset themselves.  Just doesn't appear to be so by forum measurement standards.

 

Must be like Aston Martin rounding their 5.9L up to a 6.0L V12......  I've always heard of the he351 being a 60mm turbine exducer, so it's cool to learn the actual sizes

When i locate my calipers I'll do so. 

 

I have heard that those 3 share the same turbine wheel before. 

Stop it. Y'all are gonna make me start pulling my he351s and hx35s apart and build a hybrid for this 12v......

Do it. Then send it to me! If I had the machining ability to throw a he351 compressor on a HX35, id have done it by now.  I have a feeling most of the he351 success comes from the compressor wheel.

Better off throwing an hy35 cover on the he351.