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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Just for thought: rear mounted turbo



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      07-10-2009, 05:02 PM   #1
GreenPlease
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Just for thought: rear mounted turbo

Kind of like what these guys do: http://www.ststurbo.com/

I'm thinking that the best way to get a big snail on one of our cars is to

1. Keep the existing snails in place
2. Move from a 2 pipe to 1 pipe exhaust (ala AMS)
3. Ditch the rear muffler and swap in a turbocharger, something like a GT35
4. Run the new charge pipe where the old 2nd exhaust pipe would have been
5. You'd need three bypass valves: two at the exhaust manifolds and one at the intercooler.
6. Extra BOV necessary.


The reasons are fairly obvious for the BPVs and BOV. Transition from the small snails to the large snail really shouldn't be that difficult to program. Somewhere around ~4k we cut off our existing turbos via bypass valves and shut the BOV on the GT35's line.

We would keep the low end responsiveness of our existing vehicles, prolong the life of our stock turbos, and get some serious top end kick. No "lag" on the top end because the larger turbo will have already spooled from exhaust gases coming from the existing snails by the time the transition occurs. No muffler necessary because.... well three turbos should quiet things down enough.

What do you guys think?
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      07-10-2009, 05:17 PM   #2
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who will tune this?
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      07-10-2009, 05:31 PM   #3
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I like this idea, this may be our only way to get some bigger snails..

Check out this rear turbo setup on the smokinvette, it's exhaust sounds so mean, like a jet taking off with the whistle/whine + exhaust combo:

http://www.metacafe.com/watch/yt-AG2...urbo_corvette/

Edit: I think I may have posted the wrong link, but they have a black corvette rear mounted turbo setup, sounds SICK!! Saw it on Super Cars Exposed the other day on the SPEED channel

Last edited by dlbrooks18; 07-10-2009 at 05:50 PM.
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      07-10-2009, 06:35 PM   #4
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STS style turbos = epic fail.
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      07-10-2009, 06:46 PM   #5
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Too much piping.
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      07-10-2009, 06:54 PM   #6
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Not enough room to get piping from the rear of the car to the front. This works well in american cars as they usually have a lot of room. Unfortunately, our cars are way too jam packed to get the piping to work.
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      07-10-2009, 07:16 PM   #7
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not reaally a good option for small displacement and higher boost. I'm very familar with the ststurbo's coming from the GTO community. They are a very well built setup with good performance for the big V8 guys
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      07-10-2009, 07:20 PM   #8
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Have you guys been watching Supercars Exposed?? That 800 HP Vette sounded mean !!!
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      07-10-2009, 09:45 PM   #9
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my friend had a 05 gto w/ a sts kit

8psi

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      07-11-2009, 12:48 AM   #10
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Yeah, people have made rear mounted turbos work.

Stupid idea, though.

You lose a lot of enthalpy on the hot side with that long route and have high head loss pumping the air all the way back to the front of the car.
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      07-11-2009, 12:52 AM   #11
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good idea conceptually, but application will not work on our cars for the obvious reasons of not enough room to work with.
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      07-11-2009, 02:23 AM   #12
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Quote:
STS style turbos = epic fail.
Care to elaborate? No disrespect, just curious.

Good point to the poster that mentioned head loss and enthalapy, but then again, this idea wasn't designed to be "efficient"

Enough room for piping for sure. If we can run dual 3" exhaust pipes, we can run single 3" exhaust, 3" charge pipe. I can't speak as to placing bypass and BOVs. Just an idea for big power, that's all...
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      07-11-2009, 03:01 AM   #13
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Quote:
Originally Posted by ar design View Post
STS style turbos = epic fail.
Quote:
Originally Posted by brianhn1 View Post
Too much piping.
+1
/end thread
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      07-11-2009, 03:03 AM   #14
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lol @ thinking bypass valves and blow off valves "shut down" turbos.
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      07-11-2009, 12:18 PM   #15
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STS is local to me and I was doing some contract work for them a year or two ago...

What a bunch of clowns. In fact, those dickwipes still owe me money now that I think about it.

They spend more time worrying about suing people for making rear mount turbo kits than taking care of their own business. Yes, they are suing people for making rear mount kits. They found some way to patent it.
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      07-11-2009, 12:31 PM   #16
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Quote:
Originally Posted by darkphantom View Post
good idea conceptually, but application will not work on our cars for the obvious reasons of not enough room to work with.
No, it's a crap idea conceptually. Please see above.

It would do Rube Goldberg proud.
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      07-11-2009, 01:33 PM   #17
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Quote:
Originally Posted by mwahlert View Post
my friend had a 05 gto w/ a sts kit

8psi

I am making 660rwhp and 690rwtq on 10psi with a properly designed APS twin turbo kit. Powerband looks FAR better than that too. I need to swing by the dyno to pick up my chart, and I can post it. Could have pushed it much further, if not for our awesome 91 octane gas

STS style setups suffer from so many issues its not even funny - starting with the massive lag induced by 2,000ft of plumbing, and a turbo that is sitting way to far from the engine, allowing the exhaust gasses to cool and contract drastically. Then, we can start talking about the oiling issues, and bla bla bla bla bla
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      07-11-2009, 01:36 PM   #18
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My biggest complaint is weight.

This is for dyno's, not actually tracking the car.
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      07-11-2009, 04:24 PM   #19
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Quote:
STS style setups suffer from so many issues its not even funny - starting with the massive lag induced by 2,000ft of plumbing,
Not to beat a dead horse but if you read my original post the idea was to keep the stock turbos in place and gradually bring the larger snail online ala BMW's twin sequential turbo diesels.

Quote:
My biggest complaint is weight.
Probably a net gain of ~50lbs. Don't forget you'd be dropping the factory muffler (or any muffler for that matter).
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      07-11-2009, 09:20 PM   #20
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Quote:
Originally Posted by ar design View Post
I am making 660rwhp and 690rwtq on 10psi with a properly designed APS twin turbo kit. Powerband looks FAR better than that too. I need to swing by the dyno to pick up my chart, and I can post it. Could have pushed it much further, if not for our awesome 91 octane gas

STS style setups suffer from so many issues its not even funny - starting with the massive lag induced by 2,000ft of plumbing, and a turbo that is sitting way to far from the engine, allowing the exhaust gasses to cool and contract drastically. Then, we can start talking about the oiling issues, and bla bla bla bla bla
i know cause 500lb-ft at the rear wheels on 8 psi on an otherwise 100% stock motor by 4k rpm sucks.... especially considering the kit cost half that of a aps twin setup and was easy to install in a garage...and remove to turn the car back to stock....

and turbo lag on an already stout 6 liter really ruins it for a lot of ppl
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      07-11-2009, 11:00 PM   #21
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Quote:
and turbo lag on an already stout 6 liter really ruins it for a lot of ppl
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      07-12-2009, 03:20 AM   #22
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Quote:
Originally Posted by mwahlert View Post
i know cause 500lb-ft at the rear wheels on 8 psi on an otherwise 100% stock motor by 4k rpm sucks.... especially considering the kit cost half that of a aps twin setup and was easy to install in a garage...and remove to turn the car back to stock....

and turbo lag on an already stout 6 liter really ruins it for a lot of ppl
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