Mike,

Given my experience at this point (both driving/tuning/testing) with various combinations, these are my observations:

A local car that I know well and have driven is Drifto's HTA3076 2.0L with 1.06 divided T3. With E85, we know it spools like gangbusters, has V8-like response, and it's good for ~570whp with E85:

https://www.evolutionm.net/forums/ev...e85-33psi.html

Regardless of what you are dealing with (e.g. 35R, 3076R, etc.), we know that turbine housing can support enough mass airflow to deliver at least that level of power with appropriate equipment.

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As for the 1.06 TS T4, it gives superior spool and transient response characteristics to anything equipped with a 0.63 A/R T3. This is my HTA3582R setup tuned on 98 RON (93 U.S.) with a 1.06 TS T4:
https://www.evolutionm.net/forums/ev...82r-93oct.html (see post #43)

Now, despite the fact that my 2.0L engine is 'hindered' by the largest intake ports possible (literally), large cams, and large tube exhaust primaries, the difference in transient response between my car and any 35R open T3 2.0L car is abundantly clear (and that is putting it mildly).

I managed ~585whp with 93 octane before calling it quits. I haven't finished tuning E85, but it's generating more power.

There is a forum member who demonstrated 766whp through a 1.00 A/R TS T4 and GT4088R, so we know what's possible with respect to mass airflow handling capacity.

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The only one of these turbos (AFAIK) that can be used with either divided T3 or T4 housings is a GT35R (although I heard a rumor about a TS T4 3076R housing). The 1.06 TS T4 has a larger internal volume than the equivalent T3, so a logical guess is that it's going to handle a bit more power.

I hope that helps.

 

yes that does help, Thanks Ted B

Thanks for your input too Geoff.
Expect some 3076/3082/3582 testing coming up in the future

 

I have a 1.06 T4 if you are interested for testing, open scroll though.

I went from .82 T3 to 1.06 divided T4 and picked up over 30 ft lbs of tq, Not to mention however much headroom the bigger housing gave me if I were to push it to it's limit.

Scorke

 

hmmm, i must be doing something wrong... my TS t4 1.22 A/R turbo makes 20 psi at ~3750 rpm in third

 

1.22 for what turbo

 

BWs200sx

 

On a T4TS 1.22 A/R? You sir, have a unique setup. You should post pictures and data.

 

A graph overlay would be helpful for the members if you have one.

 

So approx the equivalent of a .74 A/r single. I have a .64 on a 3.0L that spools at 2500, so this seems very believable. I would be interested in seeing some logs with shifts where you lifted to shift and the time back to full boost.

 

I don't want to have to explain boost logs, camshaft reports, compression tests, octane checks and everything else that comes along with that!

Pump gas, low boost.

If you are doubting twin scroll at this point your saying that a FP Red, Black, BBK, GT40R and larger have no use, for either street machines or all out drag cars. Times change,
now you can do this with twin scroll at more power levels because of the offerings from different manufacturers.

Scorke

 

My only defense is that I thought he was talking about a regular scroll T4. It was my bad for not reading the OPs post completely. I have never used a TS T4 so I wouldnt know, but as for a regular scroll I stand behind my testing. My apologies to the OP for rushing and not reading his post

 

Fair enough.

TedB and Drifto have made great efforts to show how much they BELIEVE in TS, just as you BELIEVE in SS.

Just as much as I'd like to see an even comparison that proved TS superior, I'd love to see somebody else prove other wise.

Fact of the matter is that if something truly works, fair testing done by either side would show the same results. Yet all we have really seen thus far from vendors is odd comparisons that seem to be grasping at straws in an effort to sell parts.

 

i say stick with the twin scroll t4 housing opose to the tw t3
my twin scroll HTA gt3582r with the t4 1.06 housing can get 20psi in 3rd gear on the stock 2.0. definately spools way faster than any singile sfroll gt35r i have seen

 

some people can't make 20psi in 3rd gear?

 

open scroll gt35r's on stock 2.0 engine definately do not come close to making 20psi by 4k rpm in 3rd gear