question on 67 turbos

[Crypton2006]

I figure this by having built and owned many turbo cars. The OP stated goals of 450-500rwhp, attainable with a much smaller turbo providing a much wider power band. IE more "suitable street turbo" and less "dyno queen turbo" than a 67mm. IE less lag, more fun.

Having actually run 4 different size turbos on my built 7m i would have to disagree with you. I made almost 500 on a TO4E 60trim that started making boost at 2900 and had full boost by 3300-3400 and was very hard to keep under control. I am running 275/35/18 Nitto555's and if you wanted to race from anything under 50mph it was a spinfest! With the 67mm i would have to argue that the car is faster even at lower speeds because i actually hook up, not to mention how much harder the car pulls on the highway. To make 500 on pump gas you are still going to be at 18psi or better on the 67MM. pushing a smaller turbo to make thoses numbers means always running in excess of 20PSI.

 

[IJ.]

Having actually run 4 different size turbos on my built 7m i would have to disagree with you. I made almost 500 on a TO4E 60trim that started making boost at 2900 and had full boost by 3300-3400 and was very hard to keep under control. I am running 275/35/18 Nitto555's and if you wanted to race from anything under 50mph it was a spinfest! With the 67mm i would have to argue that the car is faster even at lower speeds because i actually hook up, not to mention how much harder the car pulls on the highway. To make 500 on pump gas you are still going to be at 18psi or better on the 67MM. pushing a smaller turbo to make thoses numbers means always running in excess of 20PSI.

Much the same experience when I went T04z here from the GT35R.