*IC Pipe size Q:*

[7MGTEJoe]

I know where you can get compressor maps for the GT series but you'll have to buy the software it's attached to. It's $20 US to download it, I don't know if you'd consider it worth it, but it's here:

http://www.turbocalculator.com/personal.html

if you want to check it out.

 

[IJ.]

Rajunz: My car is a DD and as such max effort runs are quite short so I can't see charge heating being too much of an issue!
(That and the new IC is HUGE both the barrel and the Water Pump compared to the one I'm using now!)

Thanks for the info though it's really interesting to read!

Do you have more pics of your car anywhere?

7MGTEJoe: Thanks!

I was able to find maps for the GT series after a bit of searching !
(When I first got mine they just plain didn't exist)

For such a responsive hard hitting turbo they have a nice fat island !

 

[kylemartin]

The general accepted point at which you need to increase the size of a turbo pipe is when the air speed inside the pipe reaches mach .3, or just over 200mph.

 

[IJ.]

The general accepted point at which you need to increase the size of a turbo pipe is when the air speed inside the pipe reaches mach .3, or just over 200mph.

Yeah about 500 cfm through a 2.25" = around 206 mph/.26 mach

Mach .4/304 mph is where drag in the pipe becomes a factor and performance suffers.