Right, I realize your using the factory housing, but the adapter basically is what ATP already uses with there housing.
So basically they are both going to have the same flow characteristics, rather than the exhaust flow straight down into the turbine, it has to flow down and back to the turbine...

 

From what we have seen, the reason the ATP kit has spool issues isn't because of the way the exhaust flows, but rather the tolerances between the housing and the turbine wheel. So yes, more power can be obtained with a manifold, but the spool is somewhat similar to that of a manifold equipped car.

 

What kind of dyno does Turbo XS has???

 

The highest reading Dynapak in the country. A stock Evo made like 255whp there.

 

Its actually a dynamic testing system, but they input a 400% humidity factor to make it read like a dynojet. and who could forget about the the temp probe.

 

that should be good for high 11s.

 

XS Engineering has a Dynamic Testing System, TurboXS has a Dynapack 5000. I saw he put TXS above, so I assumed that was the dyno he meant.

 

Does these dynos read higher than the Vishnu one???

 

Every dyno reads higher than Vishnu's!

 

Just curious, how do you think an AMS 3071 kit will compare to Vishnu's offering with the cast adapter?

 

AMS kit should provide earlier spool-up ... along with a painless upgrade path to a gt35r

I'm waiting for mine to be installed, hopefully I will have dyno numbers next week.

l8r)

 

You can put a 35R on the Vishnu kit too. It can take the full GT series.

As far as spool-up, there is less exhaust gas to be pressurized in the stock manifold since it is shorter, so we might see very similar if not earlier spool ups on the stock manifold.

The only thing that might slow the spool would be the angle that the collar forces on the exhaust before the turbo.

On the bigger turbos, an extrude hone on a stock manifold might add a couple of hp IF the stock manifold creates a choke point.

 

BTW, turbos show spool at different RPM on the same car, so be careful making a comparisons with Dynojets, Mustangs, Dyno Dynamics... .

Should be 2 kits, same or similar cars on same dyno imho.

 

I was under the impression that a tubular exh. manifold flows better than the stocker, providing more hp and better spool ... wasn't that the selling point of the original Vishnu stage 3 vs. stage 2?

l8r)

 

A tube header will be better at high RPM, provided the primary runners are long enough, but spoolup is better in a cast header.