[musc]

Originally Posted by artsoasis

I'm going that route. Stage 2+ 335iS will be a beast.

Excited to see this and see how things hold up!

[Redbmwm33]

I'm not going to push anything too crazy. Probably going to be in the lower end of the TRQ range compared to other cars. I don't want to kill my dct

[jippii ensio]

Originally Posted by The Ghost

Clipping works well in many situations. Currently, the only results have been with the 20Ts and clipped (including the WR held by a large margin). There were 19t results but they were very poor. There are no "better designed" twin turbos out there. Next closest are stage 3's or single turbos but are double the cost and have way more lag.

In my experience, VTT has been awesome to work with and CS was ridiculous. He'll respond to messages at night, etc.

My advice is to go by the real-world, independent customer results. The 20T 2+ is pretty unmatched in the 500-700whp range in spool and in power. Proven power, durability, and a company that stands behind their products. My $0.02

Clipping makes the wheel flow more, but turbo manufacturers do not clip the wheels. They design a better wheel.

You are talking about your own results which are a lot better than what others have got with 20t + clipped wheels. People don't want to post up results that they or the turbo vendor are not happy with.

Instead of saying that your car is a freak or it was a high reading dyno, I trust your results are legit, since this is details business. You've put a lot of effort in everything that can have an impact in your results and no wonder other stage2+ results are not even close.

The housings are tiny and the 2+ wheels are too big for the stock housings. The stock wheels designed for the housings are a lot smaller. Stage 2 wheels are a lot bigger than stock, but from the turbo design perspective, not too large. Stage 2+ wheels in the tiny housings are out of proportion. I cannot call them a good turbo design by any turbo design standard.

The stock housings are maxed out. Going bigger than the so called stage 2 (RBs / VTT) should be done with bigger than stock housings. Out of proportion wheels will push very little more peak power due to the housing limitations, but will be less responsive and less quick in real life.

I believe RB, SMS and VTT (Hexon too?) are all developing twins that address the housing limitations when larger wheels are applied.

[musc]

Originally Posted by artsoasis

I'm not going to push anything too crazy. Probably going to be in the lower end of the TRQ range compared to other cars. I don't want to kill my dct

Same plan here. Something less than 550 lb ft and focus on more peak hp. I'm not ready for Dodson clutches yet!

[Jnat]

New twin housing sound good with a 20T, how far out are we from this happening>?

[Redbmwm33]

Originally Posted by musc

Same plan here. Something less than 550 lb ft and focus on more peak hp. I'm not ready for Dodson clutches yet!

So what turbos are you going with?

[musc]

Originally Posted by artsoasis

So what turbos are you going with?

Undecided at this point. Kind of gathering all the info I can on them all. It'd be nice to have a big single but i just dont think the DCT will be the best candidate. Too many unknowns. I am at 530-550 rwtq now and everything seems solid. No slipping and shifts fine. My goal is at least 600 rwhp and keeping the torque manageable just for the sake of the transmission.

[The Ghost]

Regarding repeatability, VTT made 640whp which I was able to reproduce without any effort. I then put in real effort and made 680whp. In my posts, you'll see all sorts of data including dynos (from 280whp though 680whp all on the same dyno). 280whp is the FBO map 0 baseline which is not at all high reading (perhaps even low reading).

Originally Posted by Jnat

New twin housing sound good with a 20T, how far out are we from this happening>?

Some have already come out but the results were much lower than people expected. I'm sure we will see more great turbos in the future.

I always go by actual results versus theory. Some things just work.

[jippii ensio]

Originally Posted by The Ghost

I always go by actual results versus theory. Some things just work.

Going by actual results, the basic, no frills cast wheel RBs (=stage 2 turbos with a decent wheel - housing match) hold the stock frame records in quarter mile times and the highest WHP. If you would go by theory instead, you would be able to claim that in theory, some other stock frame turbos could reach the same if not even slightly higher peak WHP.

VTT said themselves they are developing twins that should have better power/spool than their 20t and clip. They are not the most knowledgeable people, but even they are able to see the mismatch they came up with.