The ONLY Tial V Band GT42R available right now is has the 1.01 a/r. The larger 1.15 and 1.3 should be available soon though. If you go with the 74mm GT42 you'll be more than happy with the response and power.
And BTW, the GT42R outspools the T51R big time and makes alot more power doing so. Ray used to have the T51R on his FD and we overlayed his dyno with mine. No comparison.

 

Proof that divided housings work well. How much difference in spool did you see?

 

Almost 1500rpms

 

Thats a crazy difference. I thought maybe 8-900.

 

i think the 42R is a better turbo too, but you're comparing your full bridge spool to ray's streetport spool?

 

Now to complicate things even more, i have learned of a turbo called the Billet 76, Sean at a-spec was saying it will out perform an 80mm 45R with the response of a 42r, now I gotta start researching that turbo. Anyone have one?

 

Ive used them quite a few times and I was actually going to recommend one. I wouldnt get the straight 7675(billet 76) but instead get the GT4276. Its a Garrett 42R hotside matched with a Precision 76mm compressor. Ive had great luck with them on Supras, and I know other people who have also. If you dont need 1000+whp you should actually get the GT4271. Its the same thing but has a billet 71mm compressor.

The reason I say get the GT4276/4271 is because you get the divided housing(great for spool) and you have the awesome Precision billet compressors.

 

I sort of hijacked my own thread here, I started a new one about the billet stuff, feel free to keep posting on the 42r stuff.Also thanks for all the input, i hope i can decide soon.

 

 

This is what was recommended. As well as the 67 billet for his goals.

 

Im glad youre also steering him in the right direction I recommended the 67mm right off the bat because it would be more than enough for 600whp, but the GT4271R would be awesome on the car.