what do u think of the garrett t04z(ball bearing) and garrett gt3540....
in term of power, drive ability and lag......

 

I have the gt35r (3540). I love the driveability on the street and with my porting there is very little lag. I had 1 bar of boost by 3500 rpm. I'm not sure on power as I haven't dyno'ed but it's a great street turbo.
-Nic

 

I believe the T04Z is an HKS specific model...

 

The T04Z is made by Garrett to be sold exclusively by HKS. The T04Z would probably compare more powerwise to the Garrett GT40R.

 

i was told by my mechanic that he can get me the garrett t04z......
however i want to know like will it be very laggy....
my car setup is large extended port, dowelled, 3 mm apex seal, upgrade injectors, pump, fmic,microtech ltx8, avc-r....

so now i'm thinking of which turbo to go for between the two....

 

T04Z (cheaper alternative: PT67GTQdbb) should get full boost somewhere between 3800-4500rpm's depending on your motor, manifold, and some other factors.

 

Well if its between the T04Z or the GT35R then you will just have to decide if you want a little more power. Both turbos are bual ball bearing and spool quickly, however the GT35R is a T3 flange and the T04Z is a T4 flanage. The GT35R should reach 1.0Bar boost by 3200-3500rpm and make 380-400RWHP on a 13B and the T04Z should reach the same probably around 3700-4000 and make 430-450RWHP. Both turbos will have great response. Both are efficient to much higher boost levels so you can get plenty more power out of them on higher octane gas. So I guess your decision should be based on if you think you will be happy making 400rwhp on pump gas, why get a larger turbo than you need? But if you want to make a bit more than most other RX-7s are at the same boost levels, then got with the T04Z.

 

i've seen a guy running a t04z at 1 bar of boost...but he only make like 350rwhp.....
that a bit low isn't ..if it were to compare to what icemastr said....

 

My numbers are based off US dynos, typically Australian dynos like the dynapack etc are going to read less by about 15%, but 350 at 1.0bar is a little on low side, it should be more about 380-400 at the hubs on an australian dyno.