Billet wheel upgrade? Or is my hotside too restrictive?

[TucsonTSI]

On the hunt for 9's I've been considering upgrading my current turbo (FP3052) to a billet comp wheel. There are a few options, including: 3076HTA or GTX, or the 3582HTA or GTX. My MAIN concern is that my hotside is significantly restricting performance above 6000rpm. Here is some good dyno testing of these turbos:

Garrett GTX Turbo Comparo Part 2 » PERRIN Performance Official Blog

Especially considering the car sees 6000-8000rpm all the way down the track, I feel that the hotside is holding me back. I don't want to go through the trouble of upgrading the comp wheel if doesn't net more power. Any thoughts? Thank you!!

Specs on the FP30 ex housing: approx 9cm2 .70 A/R not sure what ex wheel.

 

[The Shodan]

On the hunt for 9's I've been considering upgrading my current turbo (FP3052) to a billet comp wheel. There are a few options, including: 3076HTA or GTX, or the 3582HTA or GTX. My MAIN concern is that my hotside is significantly restricting performance above 6000rpm. Here is some good dyno testing of these turbos:

Garrett GTX Turbo Comparo Part 2 » PERRIN Performance Official Blog

Especially considering the car sees 6000-8000rpm all the way down the track, I feel that the hotside is holding me back. I don't want to go through the trouble of upgrading the comp wheel if doesn't net more power. Any thoughts? Thank you!!

Specs on the FP30 ex housing: approx 9cm2 .70 A/R not sure what ex wheel.

The FP3052 you have uses the standard GT3076R 60mm inducer 84 trim turbine wheel capable of about 490-520whp at its maximum efficient pressure of 30-34psi of boost pressure.

 

[JusMX141]

Look at the results for the old FP3065.

A FP3065 used a Garrett GT3082R CHRA, so it was a 61mm/82mm GT35R compressor on the same turbine wheel as your FP3052/GT3076R. That turbo seemed to work great despite the smallish turbine size, so I'd feel safe opting for a compressor upgrade if I were in your shoes.

Be advised a VSR rabalance is necessary if you do change wheels....ball bearing turbos are extremely sensitive to balance specs.