what are the differences?? I figured its a small frame but would that limit the size of the exhaust wheel?? and limit the A/r choices ?

tia

 

Depends on who makes it. I believe the only difference is it has a T4 turbine housing and you can only get those with the 83 or 87mm and maybe the new 92mm Turbine wheel also. .90A/R, 1.00A/R, 1.10A/R, 1.25A/R.

I'm running a S480 with a 1.00 a/r T4 83mm turbine wheel on my truck and love it. When the same time and speed on this turbo at 11psi as I did with the Magunum bb 72 at 15psi.

 

thanks. so it should work with my 6.0 and not be maxed out or out of the map? Still finding out what A/R is on it.

 

Ya, It should work fine.

 

what might be any downfalls of a .90 A/R?

 

compressor
INducer 74.6 ex 105.4

Turbine
inducer 83.4 ex 74.3

real close to the s475 but smaller, but how would you compir the 1.32 vs .90 A/R's?

 

I wouldn't be afraid of a .90 a/r on a 83mm wheel. That's still a high flowing exhaust housing compared to a TC76-78 with just a little 68mm wheel and a .96 a/r. A/R is just a ratio of the T4 inlet and the turbine wheel outlet, not a measured size like the turbine wheel,

To give you an example, these are both .96 a/r T4's, the left is a PT88 with a 94mm turbine wheel and the right is a MP T76 with a 64.5mm turbine wheel. Same a/r, See the difference?

 

thankyou. good info.