DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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Top or bottom mount

 
Old 02-11-2010, 12:28 PM
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Default Top or bottom mount

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.
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Old 02-11-2010, 12:36 PM
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Are you going to be making your own DP? What about IC piping? Internal or External wastegate? Keeping AC and PS?
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Old 02-11-2010, 12:38 PM
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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.
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Old 02-11-2010, 01:12 PM
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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
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Old 02-11-2010, 01:56 PM
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Bottom mount FTW!

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Old 02-11-2010, 02:31 PM
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Originally Posted by SKMetalworks View Post
Bottom mount FTW!
AGREED 100%
Im going bottom mount (more stealthy for when I get pulled over )
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Old 02-11-2010, 06:16 PM
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Originally Posted by proughj View Post
AGREED 100%
Im going bottom mount (more stealthy for when I get pulled over )
What's this pulling over you speak of
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Old 02-11-2010, 06:47 PM
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Originally Posted by proughj View Post
AGREED 100%
Im going bottom mount (more stealthy for when I get pulled over )
That is a side benefit of heat shielding
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Old 02-11-2010, 06:51 PM
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go bottom mount!

ill be going this route when i upgrade all my shitz!
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Old 02-16-2010, 06:44 PM
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Bottom mount if you can. DP routing is much cleaner, less heat near your brake master cylinder.
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Old 02-16-2010, 08:49 PM
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You are a bottom mount.
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Old 02-16-2010, 09:00 PM
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I'll do either, I'm not picky.
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Old 02-18-2010, 12:06 AM
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The bottom mount is best if you can go without the ac.
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Old 02-18-2010, 12:50 AM
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Umm bottom mount works with ac, even with a 'big' 2871 compressor.
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Old 02-18-2010, 12:52 AM
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rear mount all the way baby
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Old 02-18-2010, 01:17 AM
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Originally Posted by 18psi View Post
rear mount all the way baby
Just like the dog you are.
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Old 02-18-2010, 05:42 AM
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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.
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Old 02-18-2010, 06:39 PM
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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?
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Old 02-19-2010, 10:19 AM
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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..

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Old 02-19-2010, 12:59 PM
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hf-mx5t, get in the Race Prep section, now.
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