just wondering what you would expect when you compare the 2.

i know the physical size is larger entering the housing but how much of an effect does it have on top end power.

for example a 1.1 t4 verses a 1.1 t6.

also say you couldnt use a t6, your manifold is t4, how would you compare a t4 1.25 verses a t6 1.1, would they be comparable or would the t6 always outflow the t4 regardless of a/r?

 

T6 in my experience always outperforms the T4..

 

ah cheers enzo, can you make up for the loss on a t4 by choosing a bigger a/r......i know a 1.1 a/r t6 is perfect for my needs but due to getting a mint price on a manifold i was looking at using a 1.25 a/r t4.

i could always weld on a t6 flange onto it, but wanted to see if a large a/r would compensate for it

 

What is your realistic power goal?

 

well i need 700bhp at the flywheel, im guessing thats about 610whp.

Havent got access to E85 so will be on racegas.

Dont mind going up to 2bar to achieve it.

this is on a dyno dynamics rollers, no dynojets over here, was your red one adjusted for dynojet figures?

I know gus made 595whp at 22psi on a 1.1 t6 so in theory his setup is ideal.

but cant use e85 so id imagine ill loose some power but then i can run decent boost.

the power is required to take a record, not purely for bragging rights.

can rev to 9krpm but really dont wont to rev that hard if possible

i think if i wanted 700whp then t6 1.32 but 610whp maybe the smaller turbine wheel would do it?

On your red one i think you hit 1bar at 5300rpm, wouldnt mind that if needed, im on a streetport compared to your stock port but ive got a standard inlet so maybe equals out?