In the middle of rebuilding my XS TO4S, I upgraded the comp wheel to a 67mm gt wheel instead of the 61mm old style wheel that it came with. I am told this is like a T67, but with a 1.00 hotside. I was making around 440-450rwhp at 17lbs with the old one so I am hoping with this upgrade plus the new Ground Zero LIM, and some polishing I can hit the 500 mark at 20lbs. What do you think?

 

So you now have a T04R. Seems like a good move, but is the hotside divided? Have any pics?

 

Yes, it is divided. I dont have any pics yet.

Also, anyone know what the efficiency range will be?

 

Should be nice.

 

radkins, will all this be accomplished on 91 or 93 pump gas?

 

1/2 93 and 1/2 100LL aviation fuel with hefty alcohol injection.

 

Q trim?

 

you still will be slower

 

That's what I have. The precision 67gtp. Ported shroud. It supports 75-100 hp
more than a t66 I am told. The sweet spot is 22-23 psi but it is pretty efficient
to 30psi, again, I am told. It made 405 whp at 15psi at 5500rpm. It went fat and
started to creep so we quit. Long story short, we are going tubular man and
50mm wg. I hope to see 420 at 15psi and 475-500 at 22psi. Then we are going
up to 27psi as long as fuel del. is fine. This wheel should be able to give 550-600
whp. It spools a ton quicker than my old t70. The exducer is smaller than a t66
and still gives t70 top end- gotta love gt technology! My exact turbo is on proturbokits.com website- go to turbos- precision street turbos. It goes back to
dyno friday. I'll repost results.

 

Hater

 

you should get some more HP out of it with the bigger wheel

 

Assuming 15hp per lb boost, you would be close to 500 with the old wheel.
I know it doesn't always work out that way, but 480 would seem probable.
I will be happy if I get 450 at 17psi. That would mean 550+ at 27psi likely.
The thing I'm excited to see is how my pwr air to water ic works(temps).