10 blade vs 12 blade turbine in HE351CW

[100 Proof]

All- I am looking to replace the damaged turbine in my turbo (Don't ask). My primary goal is to reduce towing EGTs, although I am not adverse to other benefits as well.

I am looking to purchase from BAE (http://baeturbosystems.com/turbineshaftwheel.aspx) either:

Holset HE351CW 70mm x 60mm 12 Blade turbine,
Item Number: HHE351TS7060

Or:

Holset HE351CW 70.00mm Inducer 60.00mm Exducer 10,
Item Number: HHE351CWTS7060H

I have 3 questions,

1- What are the advantages and drawbacks of one vs the other?

2- What are the spool characteristics I should expect from one vs the other vs the stock 65mm x 58mm turbine?

3- Do I need to modify my turbine housing, and if so, to what specs?

I intend to post a write-up about this mod on when I’m done.

Thanks!

100 Proof

 

[promisedland]

I had TaterTurbo machine my exh housing and put a 12 blade wheel in... said to reduce back psi. Sounds WAY better! Mine is a 76-64 turbine wheel.
Drive psi shows lower to.

 

[100 Proof]

What did that run Ya?

100 Proof

 

[BILTIT]

His website shows $1100+core for a 63/65 he341/351, the 63/67 is $1200+core.

I cannot recall what the 62/65 was when i bought mine.

 

[promisedland]

I paid $1100 all done after core was refunded.
Mine is the 62-65. Larger exh wheel and a slightly bigger billet ext tip compresser wheel. Spools quick and sounds great!

 

[AH64ID]

I wouldn't go with BAE wheels, I have heard some not so great things about them.

Who is going to do the machine work on the turbine housing?

I highly reccommend shipping it off to Tom/Jay at Turbo Re-Source to have the turbo rebuilt and a 70x60mm wheel installed. They used the HE351VE wheel in my dad's 06 (70x60mm 12 blade) and it's a SWEET towing turbo.

Personally I see zero need to modify the compressor wheel as the compressor already outflows the turbine wheel/housing, which is evident by the very high drive pressure ratio the HE351CW runs. By increasing the turbine flow alone you aleviate some of the back pressure and still have enough compressor flow; however, when you increase both the compressor flow and turbine flow you don't do as much to aleviate the back pressure.. which IMHO is one of the main reasons to modify the HE351CW. Save your money and only do the turbine side.

I have heard good things about Tater, but he also doesn't have towing turbo combinations down yet.. or at least last I heard some first had reviews he didn't. He does do good work thou.

Unless you live at sea level I would stick with the 60mm exducer, which I also think is better for heat durability when towing.

 

[brillmtb]

I have been looking at compound turbo setups for towing, lower egt and more power. Concerned about passing smog on visual check although NV doesn't do that yet. Is replacing a single turbo that much of a benefit over stock for what I am trying to do to seriously pursue it as an option?