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Old 04-29-2008, 12:31 AM   #1
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Default Rear mounted turbo?

Been looking around the forum for a couple months now doing some research before I try anything or say anything stupid but...

I searched but couldn't find anything on this and was wondering if anyone had tried a rear mounted turbo on a miata. I know a friend who put an STS rear mount on his rx8 and is running 7-8 PSI pushing out about 350 RWHP. I'm not sure where there would be room for a turbo under a miata but it seemed like a decent idea to keep the engine bay temps down. I'd like to know what you guys thought about this system. Thanks in advance...

STSturbo.com
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Old 04-29-2008, 12:41 AM   #2
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There is a guy on clubroadster doing it... the majority of us think he is silly for doing it. He's doing a much cleaner install this time around, still rigged in back a bit though.

On cars that don't have space to do it... its usefull. On cars with space... its stupid... period.
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Old 04-29-2008, 12:42 AM   #3
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there is plenty of room under there once you get rid of the factory muffler.

We toyed with the idea a bit for my daily driver before I settled on the BEGi S. the idea of having to run an additional pump(s) to get oil(& water) back there turned me off.
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Old 04-29-2008, 12:51 AM   #4
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The increased plumbing for both the charge piping and oiling isn't something I would want to deal with. Kurt Rohmer has threads here and miata.net about doing it. Most of his problems stem from not using the correct parts for any of his build. Everything he used was super cheap, such as rubber hose for charge piping.
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Old 04-29-2008, 12:52 AM   #5
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Quote:
Originally Posted by paul View Post
there is plenty of room under there once you get rid of the factory muffler.

We toyed with the idea a bit for my daily driver before I settled on the BEGi S. the idea of having to run an additional pump(s) to get oil(& water) back there turned me off.
Never thought about that. Supposedly though a rear mount is supposed to be able tocool the charge with the long boost pipes leading up to the front so there is no need for a FMIC. Interesting idea but not sure if it is practical for our cars.
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Old 04-29-2008, 12:54 AM   #6
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Yes, that's one of the reasons I considered it. That and I had a hard-on for keeping my RB 4:1 header for some reason.
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Old 04-29-2008, 12:54 AM   #7
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Old 04-29-2008, 12:54 AM   #8
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under the hood is the easier way of doing it. high engine bay temps aren't really a problem, just build it right.
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Old 04-29-2008, 12:56 AM   #9
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Old 04-29-2008, 01:14 AM   #10
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i don't see a problem with it but i tend to like different stuff. the miata does have a good amount of room back there i don't think that will be a problem. My only worry is the oil system, it's gotta be just right. in my mind they work better with bigger turbos and lower boost?
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Old 04-29-2008, 01:20 AM   #11
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That guy has no hair on his ***.

Lucky ****.
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Old 04-29-2008, 01:32 AM   #12
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What about using a rear mount for a twincharged setup?
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Old 04-29-2008, 01:35 AM   #13
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Quote:
Originally Posted by miatamania View Post
What about using a rear mount for a twincharged setup?
You can do that all in the engine bay also.
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Old 04-29-2008, 01:44 AM   #14
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Quote:
Originally Posted by miatamania View Post
What about using a rear mount for a twincharged setup?
if alta can squeeze a supercharger AND turbo under the hood of a mini, our engine bays can fit anything you can think of.

here's the link for anyone who cares-
http://altaminiperformance.com/produ.../22/Twurbo-Kit
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Old 04-29-2008, 02:14 AM   #15
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imo its not worth the effort, especially since miatas have so much room under the hood for a proper turbo setup
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Old 04-29-2008, 02:38 AM   #16
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I know you CAN do it under the hood, I was just thinking of where a rear mount could actually help?
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Old 04-29-2008, 02:51 AM   #17
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on a gto or a corvette where there is little room under the hood i can see it working....IN FACT, the sts kits they tested on the vettes were VERY impressive
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Old 04-29-2008, 03:03 AM   #18
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Rear mount turbos are used when a turbo can not be confined closer to the engine in the traditional way. In a miata a remote mount would offer no real appreciable advantages. The added complexity sucks. Plus it will spool later.
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Old 04-29-2008, 10:26 AM   #19
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Quote:
Volvo 440 turbo as its nice and small to minimize spool up time.
Quote:
Boost came in about 4k, lag was almost non-existant.

Enough said. That toy of a turbo should spool fully during cranking. IIRC, it's a Garrett T2 compressor wheel and a T15 Turbine at .48 A/R.
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Old 04-29-2008, 10:41 AM   #20
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Rear mount turbo on a Miata is super awesome...




























































If you have an LSx in the engine bay!
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