After searching I couldn't come up with the reasons to go top or bottom mount. I assume top mount for larger framed turbos, and bottom mount it if you can. I could see charge piping, waste gate, and downpipe being factors as well. where would a gt28 frame sit the best.

 

Are you going to be making your own DP? What about IC piping? Internal or External wastegate? Keeping AC and PS?

 

You've pretty much got it. Bottom mount has sucky access but the downpipe routing is much better for heat and flow reasons. Top mount is the opposite, easy to access turbo/dp flange and depening on your imtercooler routing easier charge pipes, but the dp needs to do a ~110* turn straight out of the turbo, right next to heater lines, brake lines, throttle cable, and ocasionally electrical bits.

 

The joy of bottom mounts is that you can easily mount the turbo on the manifold before you mount the manifold in the car. If you dont do a v-band on the turbine exit the downpipe can be a bit tricky to get on. As curly said, downpipe routing is great coming out of a bottom mount downpipe. Keep in mind with bottom mounts you also need to deal with your mixing manifold but its not really all that difficult to be honest.

Side/top mount will leave you more room for your AC/PS bits if you have them. For a GT28 turbo i'd go bottom mount, but I could be biased =P

 

Bottom mount FTW!

 

AGREED 100%
Im going bottom mount (more stealthy for when I get pulled over )

 

What's this pulling over you speak of

 

That is a side benefit of heat shielding

 

go bottom mount!

ill be going this route when i upgrade all my shitz!

 

Bottom mount if you can. DP routing is much cleaner, less heat near your brake master cylinder.

 

You are a bottom mount.

 

I'll do either, I'm not picky.

 

The bottom mount is best if you can go without the ac.

 

Umm bottom mount works with ac, even with a 'big' 2871 compressor.

 

rear mount all the way baby

 

Just like the dog you are.

 

I find mounting it on the side of the engine is quite favourable. That way there's no hood clearance issues or problems knocking it off on speed bumps.

 

looks like im going to need help with all this mounting business, should i aim it for 3 oclock or let it shoot straight down?

 

bottom mount if you can. easy to work on, smoother downpipe with less bends, and possible to mount the wg where it can be accessed..

 

hf-mx5t, get in the Race Prep section, now.