Would be interesting to see one of full races twin scroll manifold up against the cbrd setup just for datas sake. The pic on the cbrd Instagram of the evo 9 kit looks quite amazing though.

The nasioc thread linked above has some very interesting data, I just don't think it transfers over to our motors very well personally.

 

I just wanted to chime in and say that WRX's make TERRIBLE points of data when evaluating turbos. The top mount setups inherent in subies make top end efficiency GARBAGE and the torque dropoff is way more dramatic than typically seen in an evo. Not only that, i'm pretty sure 95% of all exhaust manifold setups on subies have interference exhaust pulses (the signature boxer sound) that makes for extra backpressure up top. What does that mean? That means the only takeaway from this data is that there is some amount of decreased boost threshold a TS has, and some amount of increased top end an open volute may have. Disregard everything else.

 

local guy with a forged 2.65 litre STI did 485 HP @crank on T25 7163, and that was after they custom made a equal length manifold for the car... of course now it doesnt sound like a subi anymore..

 

our track car was 2-3 seconds faster around a small 1.4 mile track with a change from twinscroll 35R to Vband open scroll 35R with 100more whp at the same boost- and about a 285-300 rpm loss in spool- it was a 440 to 550whp bump at the same psi

cb

 

even Goeff from from full (who we talk to every other day- and share information with) will agree-

TS will pickup a few hundred RPM but lose 30-40 peak whp on a nuts to nuts EVO build like this-

cb

Ill get some more info of the RBX open scroll setup on here soon- we werent on here to sell anything though- I was trying to get some flow/hp data up in the smaller range 6758-7670 range- most of the guys on here were asking about 8374 etc- which isnt a kit we are interested in building at the moment!

cb

 

I absolutely believe you, it would be interesting to me to see exactly where in the power band the changes are on our motors. But it's also probably data we could live without (the effect was pretty well shown in that sti dyno, however there was a good point made that it may have not been on the same header type).

I just like data....that's why it takes me 2 years to make decisions in mods lol. Plus I'll already have to sell multiple organs for an efr kit anyway...so I might as well be sure

 

LOL!


we like data too- thats why we've been partial to get feedback from guys like MRfred etc over the years- we like third party evaluation too!

but we do our best here!

cb

 

If you guys are horny on t4 transient and spool pickup, just wait till the BWTS VTV device hotsides are released. We have tested every EFR turbo(6258-9180) with a QSV style valve built into our 2.2L i5 Audi manifolds, and the results are insane if you control them correctly. It takes a bit of work to get a valve like that happy, as you are virtually dropping EMAP when you open the other vein, much like a wastegate does. With good PID controls, it isn't too bad though.

The eventual BWTS offering should be even better, with better durability and slightly higher top end due to not having a blade in the flow vein.




Raw data 7163 EFR .80 T4 2.2L i5 20vt. Black valved, red open t4 e85





EFR7163, .80 T4 with Valve, 2.2L 20vt i5 e85

 

Wish I had the time and money to try your kit this time. I'm quite in favor of TS as well, but with the light turbine wheel, perhaps the SS turbo still has great transient response compared to currently available alternatives and at the same time makes more power.

 

Looks fancy, but still a few years away.

 

Bbk-b kills this data
And HKS 7460 knocks it out of the water

10psi at 3000,
Bbk-b on my E8 did 10psi at 2500rpm...15psi at 2750....by 3000 all in.
I swapped to Bbk-because before it the HKS 7460 was even "worse": spooling to 12+psi before 2500, surging despite best effort to control.

Have to believe 7163 can do better!

 

AHAA! I was seeing this even from just running the Garrett "Boost Advisor" app on their web site, and wondered if it was real. Guess it is!

 

I wouldn't be surprised if it was 36 months out, but my bet is closer to 18-24.

Here is some 6758 data on the valve. Our Land and Sea awd dyno reads about 3% lower than both local mustangs to us, and about 16-17% lower than 2 dynojets local to us. This is done on our test mule Audi S4




6758 .80 t4 on e85 2.2L i5 20vt with Valve and without valve(solid lines) Green boost, red Whp, blue WTQ and black TSS





6758 .80 t4 on e85 2.2L i5 20vt

 

I dont see a BBK-B-BB making the power of the 7163 when we have final testing published

but The 7163 isnt spooling like the BBK-B-BB either- to be expected

here is a pic of our EVO X kit with 7163 IWG

on a stand before installation

 

We are excited to try the spool valve setup- however packaging again will limit the use on most applications-

It's nice having Borg giving us support-

cb