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Rear Mount Turbo?

Old 01-08-2013, 04:37 PM
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Question Rear Mount Turbo?

the turbo sets near the back end of the car.. has anyone thought of this for rx-8?
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Old 01-08-2013, 04:43 PM
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for a series 1, yes
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Old 01-08-2013, 05:17 PM
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No you are the first to ever think of a rear mount on an RX-8
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Old 01-08-2013, 05:40 PM
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Rear-mount turbos are awful, especially on small-displacement cars. The lag is mind-boggling, because it takes so long for the turbo to pressurize the super-long intake runner. It's seriously pointless unless you're drag-racing and you have the opportunity to pre-rev the engine every time you pull away from a stop.
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Old 01-08-2013, 05:42 PM
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Old 01-08-2013, 05:47 PM
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Originally Posted by fyrstormer View Post
Rear-mount turbos are awful, especially on small-displacement cars. The lag is mind-boggling, because it takes so long for the turbo to pressurize the super-long intake runner. It's seriously pointless unless you're drag-racing and you have the opportunity to pre-rev the engine every time you pull away from a stop.
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Old 01-09-2013, 11:31 AM
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Blow me, 9k. The same turbocharger, powered by the same exhaust stream, will take a longer time to pressurize a larger intake runner than a smaller intake runner. Physics always wins.
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Old 01-09-2013, 11:58 AM
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Yeah, talk when you actually have some personal experience on the subject. Until then, you are just talking out of your *** and stating your own uneducated opinion on the subject. Bumblebeerx8's rear mount Turbo RX-8 pulls like a freight train and is one of the best turbo RX-8 builds to date.
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Old 01-09-2013, 12:08 PM
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Originally Posted by 9krpmrx8 View Post
Yeah, talk when you actually have some personal experience on the subject. Until then, you are just talking out of your *** and stating your own uneducated opinion on the subject. Bumblebeerx8's rear mount Turbo RX-8 pulls like a freight train and is one of the best turbo RX-8 builds to date.
I saw this car, this past summer, at a car show. It was the main reason I went. I've followed his build since day one. It looks nice. I didn't get a chance to see it perform, but I'm sure it's top notch.
STS was looking to build a kit for the RX8, back about 2005. The project was stillborn due to the lack of options for engine management at the time.
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Old 01-09-2013, 01:01 PM
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Might be useful for some to check out the FAQ's etc from the STS Turbo website: STS Turbo, Inc. - Benefits of STS Systems

Short version: The turbo chosen will be different that that for a front-mount. For modest boost levels, an intercooler isn't needed, saving not only that volume, but greatly reducing the flow resistance. Extra oil cooling for the extra hp is often not needed due to the cooling in the long oil lines between engine and turbo. The time to pressure charge the intake tube is given as 0.05 seconds. Eliminating or downsizing the muffler can bring the added weight close to zero. The reduced temperatures increase turbo life and eliminate the need for high temp exhaust materials and shielding or heat-proofing underhood components. The lower temps also eliminate the need for a turbo timer.

YMMV
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Old 01-09-2013, 01:34 PM
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Originally Posted by alnielsen View Post
I saw this car, this past summer, at a car show. It was the main reason I went. I've followed his build since day one. It looks nice. I didn't get a chance to see it perform, but I'm sure it's top notch.
STS was looking to build a kit for the RX8, back about 2005. The project was stillborn due to the lack of options for engine management at the time.

He is an excellent fabricator (professional by trade) and doesn't cut any corners. When my car goes under the knife on the next build he will certainly have a hand in it. It's just too bad he lives so far from me.

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Old 01-09-2013, 01:43 PM
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Originally Posted by HiFlite999 View Post
Might be useful for some to check out the FAQ's etc from the STS Turbo website: STS Turbo, Inc. - Benefits of STS Systems

Short version: The turbo chosen will be different that that for a front-mount. For modest boost levels, an intercooler isn't needed, saving not only that volume, but greatly reducing the flow resistance. Extra oil cooling for the extra hp is often not needed due to the cooling in the long oil lines between engine and turbo. The time to pressure charge the intake tube is given as 0.05 seconds. Eliminating or downsizing the muffler can bring the added weight close to zero. The reduced temperatures increase turbo life and eliminate the need for high temp exhaust materials and shielding or heat-proofing underhood components. The lower temps also eliminate the need for a turbo timer.

YMMV

He doesn't have a clue and it's obvious he knows nothing about rear mounts or modern turbos. I know a guy I used to drag race with that has an 80's model Chevy pick-up with a home made rear mount kit and it is the ultimate sleeper and runs 12's in the 1/4 mile. It is 90% bone stock in appearance. I can only imagine what it would do with a proper modern turbo and supporting hardware but he just did it for the fun of it. I have also seen numerous rear mount Vettes at the track over the years. Most who speak of turbo lag have never turbocharged anything (or at least not in the past 10 years).
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Old 01-09-2013, 01:43 PM
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I have had a 3rd gear drag race from a roll . My side mount setup vs a mid mount setup (turbo sitting where cat was) . Both cars fully tuned and running well with almost identical sized turbos running same boost .

Difference at spool up was ............................HUGE !!!!!
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Old 01-09-2013, 02:13 PM
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Originally Posted by Brettus View Post
I have had a 3rd gear drag race from a roll . My side mount setup vs a mid mount setup (turbo sitting where cat was) . Both cars fully tuned and running well with almost identical sized turbos running same boost .

Difference at spool up was ............................HUGE !!!!!

Yeah man but there are so many variables that could have contributed to that outcome. Picking a properly sized turbo is so important (I wish I had done more homework when picking mine). I'm not familiar with the mid mount setup you are referring too and it's configuration. But the idea that a rear mount system in general is inferior to other setups is just silly.
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Old 01-09-2013, 02:15 PM
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+1 for walking up to a car w/ a rear mount and saying "hey that car doesn't even have a muffl--- OHHHHHHHHHHHHH"
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Old 01-09-2013, 02:23 PM
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Originally Posted by 9krpmrx8 View Post
Yeah man but there are so many variables that could have contributed to that outcome. Picking a properly sized turbo is so important (I wish I had done more homework when picking mine). I'm not familiar with the mid mount setup you are referring too and it's configuration. But the idea that a rear mount system in general is inferior to other setups is just silly.
I know Bumblebees' setup spools up pretty well just from seeing the logs - would really like to take it for a spin !
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Old 01-09-2013, 02:26 PM
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Originally Posted by Brettus View Post
I know Bumblebees' setup spools up pretty well just from seeing the logs - would really like to take it for a spin !
Yeah he has a baller turbo He was also talking about upgrading it to a GTX too.
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Old 01-11-2013, 03:00 AM
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thanks everyone.. i was wonder if our 13b engines sell fast?
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Old 01-15-2013, 01:15 PM
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Just found this, you guys crack me up. I will say there are quite a few changes since my original build. It is very possible and is quite hard because of the lack of info or *** hats that jump to the first conclusion that the lag is horrible. As for the GTX/HTA upgrade I still have not decided its worth the extra for who knows what real gain. Really need to fully tune what I have and quit changing things first
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Old 01-15-2013, 05:58 PM
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it would be nice if you'd update your build thread, I thought maybe you quit the project or something
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Old 01-15-2013, 07:22 PM
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Oh no did not quit. After I spoke with you I did the fuel stuff and changed a few other things I had talks with you and others about. Every thing on the turbo end is great and was moving forward good with Brettus. I ran into a burnt up alternator and then winter so I kinda threw it on the back burner. I have a used OEM alternator on the way and have thought about a High Output one.
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Old 01-16-2013, 10:15 PM
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Originally Posted by bumblebeerx8 View Post
As for the GTX/HTA upgrade I still have not decided its worth the extra for who knows what real gain. Really need to fully tune what I have and quit changing things first


Those turbos really shine when you turn up the boost...If your not going to run lots of boost then save your money.
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Old 01-18-2013, 02:50 AM
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Originally Posted by bumblebeerx8 View Post
Oh no did not quit. After I spoke with you I did the fuel stuff and changed a few other things I had talks with you and others about. Every thing on the turbo end is great and was moving forward good with Brettus. I ran into a burnt up alternator and then winter so I kinda threw it on the back burner. I have a used OEM alternator on the way and have thought about a High Output one.
damn dude, I offered up a used one I have way back when
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Old 01-18-2013, 08:35 AM
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Yeah we moved early Nov. and the car barley made the journey to the new house. I should have one on the way from Topgear8 and get it thrown on once its not so damn cold.
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Old 01-20-2013, 11:27 PM
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i thought the turbo lag myth was shot down years ago...
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