What's the HP limit for the 21U turbine housing?

[Torques]

What's the HP limit for the 21U turbine housing?

As per title what is the the HP limit for the 21U housing due to backpressure?

(I'm talking about high flowed units)

 

Thank you!

Just found this, so 270RKW at best?

 

 

Edited February 8, 2017 by Torques

[-S-]

About 450 hp so 380 ish rwhp???

[admS15]

240-270 rwkw on 98, 290 - 320 rwkw on e85. Give or take a bit depending on type and brand of dyno.

[hypergear]

I pulled 293rwkws on a 21U once with a custom CHRA set and tones of work to the turbine housing. The problem is OEM housing does not contain enough materials to containing a big enough turbine wheel. For that experiment I deliberately broke through the rear housing then filled it back with blanks. I got pretty good result, but not for the time and efforts put in.   

[Torques]

Thanks for the replies ... I'm about to install a new hybrid with billet wheel.

My car has already a hybrid (21U) installed and makes about 14PSI @ 3500rpm  / 540NM @ 3900 and about 260KW at the rear.

I like the responsiveness but the engine gradually runs out of urgency from 5000rpm onwards (boost declines), so 280KW+ would be nice.

Now I could have the OP6 housing machined and put on that new turbo but I don't want to introduce too much lag.

(car is used mainly in traffic or around town)

 

I read here that I would lose about 500rpm for same boost levels ? (OP6 vs 21U)

 

 

 

 

 

[hypergear]

OP6 generally lose 500RPM of response and picks up 30kws of extra power. capable of alot more once externally gated.

 

[Torques]

Would you have a dynograph for one of your high flowed OP6 and 21U hybrids?

 

[hypergear]

Based on E85 fuel. G3 CHRA,

OP6 Internal and externally gated

 

21U internally gated:

 

 

[Torques]

Thank you ... very helpful.

Are both on RB25 (not NEO)?

Both make same torque/HP (350NM) @ 3500 rpm, but boost is different? (10 PSI vs 18PSI)

 

 

[hypergear]

Both R33 RB25det not Neo. using identical size core, the 21U is more responsive while OP6 made more power.  also correction on the dyno reading of the modified 21U rear housing on Friday's the 10th post, the correct reading has been updated (on P98 fuel) 

[Torques]

Here's a picture of the gas passages OP6 / 21U

OP6 definitely larger and possibly a more advanced design?

Edited February 15, 2017 by Torques