Hey guys, I am going to do a rear mount turbo project on my 09' GMC Canyon with the 5.3. I have been talking with Trick Performance about building the actual kit for me, but I need help with sizing the right turbo for my application. My truck is and will always be a daily driver with no converter so I need decent power throughout the rpm range and not just at 4-5K+! Might do a small cam later, but that is the furthest I am willing to take it. Looking for 500-550hp. I am leaning towards 67mm compressor and exhaust wheel, but have no idea what size a/r housing i need for a rear mount with 3" exhaust? .70,.82,.96, or somewhere in between? What do you all think? Not set on 67mm either, was just my initial thoughts.

 

With those goals in mind, I would get the smallest wheel/housing combo you can find.

 

Thought I would add that the turbo will be ceramic ball bearing and the truck has 3.42 gear ratio.

 

I'm going to be running a 72mm compressor 64.5mm exhaust with a .81 A/R on a lq9

 

The a/r will depend on how far the turbo is mounted back.
housings are cheap to swap out if you need to.

 

Does the a/r housing need to increase or decrease in size the farther the turbo moves to the rear?

 

It would need to get smaller the farther back u go. 67-70 mm turbo with .80ish a/r should work good for your goals

 

My GT67 with .81ar was located in place of the muffler. Pipes wrapped, it would start to hit hard at 2800-3000. At 5lbs or so with the 20s I dropped .64 in the 1/8th (9.54 to 8.90) going from 3.42s to 4.10s with the 275/55x20s. Stalled at 2000. From one week to the next, same weather right when I got it back from TRT. Those tires were pretty tall and heavy.

 

Smaller a/r or wheel the farther you get away from the heat source, and exhaust pulses.
If there is interest in this set up, we can build some fixtures and do a group buy at one time.

 

At what rpm was your peak boost on this setup? Would that 67mm turbo run our of breath in the upper rpms (5K-6K) or was it still pulling hard all the way through the gear?