Miata Turbo Forum - Boost cars, acquire cats.

Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   DIY Turbo Discussion (https://www.miataturbo.net/diy-turbo-discussion-14/)
-   -   new garrett's (dualboost) (https://www.miataturbo.net/diy-turbo-discussion-14/new-garretts-dualboost-67461/)

hustler 07-27-2012 02:11 PM


Originally Posted by Braineack (Post 908714)
what's that from?

Your legacy.

Braineack 07-27-2012 02:14 PM

well someone got it all wrong. although I do like "30 rock"

RotorNutFD3S 07-27-2012 02:18 PM


Originally Posted by hustler (Post 908702)
I'm not very excited about the titanium aluminide.

Why? Their .pdf says they are not using it.

shuiend 07-27-2012 02:34 PM

Do they come in full v-band and same form factor as my current 2871?

Saml01 07-27-2012 02:42 PM

I find it interesting that the turbine side has no exducer, the wheels is one constant radius. I'm no expert but I assume that reduces back pressure.

Paging Joe Perez.

triple88a 07-27-2012 04:04 PM

1 Attachment(s)

Originally Posted by Saml01 (Post 908737)
I find it interesting that the turbine side has no exducer, the wheels is one constant radius. I'm no expert but I assume that reduces back pressure.

Paging Joe Perez.

Technically you're talking about the Inducer as on a turbine its flipped.
https://www.miataturbo.net/attachmen...ine=1343419444



On a standard turbine there is a radius between the inducer and exducer as the flow of exhaust is inserted from the vertical and exits on the horizontal.

On the dualboost design the flow goes from vertical to the horizontal via that heat shield and then it enters the turbine wheel horizontally and exits horizontally.

triple88a 07-27-2012 04:15 PM

Check this ---- out.

Honeywell Turbo Technologies » VNT

Full_Tilt_Boogie 07-27-2012 07:50 PM

Shits old. I saw turbos like this in a 50 year old book about stationary engine design.

Theyre just using an axial turbine instead of a radial turbine.

TurboTim 07-27-2012 10:29 PM

I like it a lot.

triple88a 07-27-2012 11:31 PM


Originally Posted by Full_Tilt_Boogie (Post 908821)
Shits old. I saw turbos like this in a 50 year old book about stationary engine design.

Theyre just using an axial turbine instead of a radial turbine.

Well i'm sure if we just reconfigure something the right way we'd be able to go light speed too.

soviet 07-28-2012 01:00 AM


Originally Posted by blaen99 (Post 908687)
Think 2871 power with 2554 spool.

where did I hear this before?

oh right here

Originally Posted by hustler (Post 908702)
I'm not very excited about the titanium aluminide.


Originally Posted by mazda/nissan (Post 908713)
I bet your muffler is.

so much love.

Anyways I think it's neat and all. Will the 2013 Indy Dallara chassis use this turbo? :party::party::party:

njn63 07-28-2012 09:39 AM


Originally Posted by soviet (Post 908884)
Anyways I think it's neat and all. Will the 2013 Indy Dallara chassis use this turbo? :party::party::party:

The fact they're using a Dallara chassis should tell you how much they care about using the best equipment. :giggle:

Braineack 07-28-2012 11:41 AM

nissan delta fan?

aaronc7 07-28-2012 11:45 AM

how long till dualboost churbo?

njn63 07-28-2012 12:15 PM


Originally Posted by Braineack (Post 908952)
nissan delta fan?

Negative, F1 fan. Dallara built HRT's first car and it was slower than the GP2 cars at some circuits. :rofl:

Braineack 07-28-2012 12:37 PM

can you believe they actually seriously submitted that to indy for the 2012 chassis?

hustler 07-28-2012 02:33 PM


Originally Posted by njn63 (Post 908960)
Negative, F1 fan. Dallara built HRT's first car and it was slower than the GP2 cars at some circuits. :rofl:

Ouch.

JKav 07-28-2012 05:50 PM


Originally Posted by hustler (Post 908702)
On a related note, double-stacked compressors is a pretty sweet idea, although I always thought turbos increased in efficiency as they grew larger due to tolerances dropping.

I'm not very excited about the titanium aluminide.

You are right, larger diameters generally eke out higher efficiency than smaller ones (b/c blade clearances do not scale with diameter). The dual compressors allow higher shaft speeds for a given mass flow, though, which the turbine likes quite a lot (it provides a more favorable blade speed ratio, improving turbine efficiency).

The axial turbine deal is pretty clever. Compared to radials, axials can't do high expansion ratios (which is why you see multiple axial stages on aircraft) but they can operate with higher efficiency over more of the operating range.

This efficiency advantage of axials is particularly large when the exh gas velocity is high compared to the turbine tip speed, precisely the situation that presents itself during an engine's blowdown period. The axial is simply better able to convert the engine's exh pulse energy into boost.

And compared to radial, the axial is inherently a tidier wheel (lower mass, less inertia). The inertia situation is further improved by the higher rotational speeds, which lets everything get smaller and less inertia-y.

On top of that, there's a big reduction in aero-induced thrust load on the rotating group. Less thrust load = lower bearing losses = more zippier turbo.

To me the coolest part is that the improvement in transient response comes without adding much if any cost. The construction of a dualboost turbo is basically the same as a traditional wastegated turbo.


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