924Board.org

[Rich H]

Practical Performance car mag have just run an article on a Peugeot 205 GTi where the rear silencer/muffer had been replaced with a small ish turbo... Everything else was stock.

Allegedly with the standard small bore exhaust and even with a long inlet pipe there is very little lag (Probably due to the stock CR so it's hidden) and its running 1 bar boost... the pipework returns under the car so isn't intercooled and because of the distance to the turbo the exhaust valves don't suffer with excessive heat. (The exhaust gasses have cooled somewhat by the time they get there I suppose)

Now I have no idea about turbo's but there is a large gap under the fuel tank(!) that would easily swallow a turbo, there is even a nice big exhaust hanger on the gearbox to bolt it to. It will need an oil scavenge pump and some pipework clearly.

Aside from the lag (that would appear to be inherent in this design but who knows) Theory says 1 bar is safe on most engines would the standard block at 9.3 CR take a bar of boost?

Rich
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[ideola]

Here is a previous thread that dives a bit into that discussion...
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erstwhile owner of just about every 924 variant ever made

[daveo]

Rich
just been out and got the mag.
sounds doible, im going to play with this one as i abandond my SC install, (eton 4 sale) i have the turbo its a Garrett .51 or M53 thats what it say on the outer part. i see he is not using a dump valve, or int-cooler. oil pick up may be a problem but will sort that out.
its worth a cheep try

Dave

[tuurbo]

Madness.

Still it could be rightly placed madness! Why not try if it makes you laugh.

I don't think putting a turbo there would be genius. I'll keep my 'genius' labels for real genius like inventing an artificial liver or something.
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1980 924 turbo, MSD, Meth. Inj, otherwise stock.

[Rich H]

I haven't been thinking about it... much!

You need to be very careful with the fuel tank above it! I would look at an ali cowling and a fan to keep the air moving when you stop or when stuck in traffic. The is no need for an intercooler as the long run back to the engine will sort that mostly. Oil feed just needs an electric scavenge pump.

Rich
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[daveo]

madnes?
yep you may be spot on, but if this has been dun and it works on the pug-205, it may work on the 24
as for the guinnes ill have a pint

Dave

Rich on at the same time posting
i have just sorted a 12v oil pump and a small rad £25. as for the cooling heat wrap will help
Dave

[Rich H]

Cool!

Where are you based? I'd love to see the results!

I dunno how much oil pressure the turbo needs though

I would make sure you have a decent heat shield around it as well as the heat wrap, just to be sure...
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[Fast924S]

They make kits like this for all kinds of cars/trucks, It works, My friend has one on his tacoma, No lag, Cool charge.

http://www.ststurbo.com/

IF somebody wanted to they can use the universal kit
http://www.ststurbo.com/universal_system
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Rebuild COMPLETED, Many mods, better power, Just ask for info

[356speedster]

Rear mounted turbo has also been done on the 928

Pics: http://forums.rennlist.com/rennforums/showthread.php?t=312170

Dyno: http://forums.rennlist.com/rennforums/showthread.php?t=400838

TV show showing a rear mounted turbo install: http://www.youtube.com/watch?v=SMB14OOfgss

Rear mounted turbos don't work as optimal as a front mounted turbo's, but they do work pretty good. If you only need a moderate boost it might even have some advantages over conventional turbo placement with no need for special manifolds, intercooler, much less heat and troubles caused by heat in the engine compartment and also less wear on the exhaust side of the turbo itself.

Most people seem to think it would create big lag, but those who has done it don't seem to share that opinion, I guess it comes down to how much time you spend on finding the right size turbo and charge piping diameter to suit a rear mount setup.

One could even wonder if those cheap bad quality Chinese turbos might survive in a rear mount setup?
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1982 Porsche 924 na My 924 blog
1990 Porsche 928 S4 My 928 blog
1995 Fiat barchetta
2007 BMW 318d M-Sport
2010 Volvo V50

[356speedster]

This thread woke up some ideas I had last year, and while googling around I found this website about a Peugeot 205 GTI track car on a tight budget with remote turbo install. Very fun reading and their low budget concepts are perfect for the 924

http://www.balancemotorsport.co.uk/main.asp?category=Project+Car

Btw: also found a Miata rear mount video "chicken wire and duct tape, baby": http://www.youtube.com/watch?v=3THpfDferqk
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1982 Porsche 924 na My 924 blog
1990 Porsche 928 S4 My 928 blog
1995 Fiat barchetta
2007 BMW 318d M-Sport
2010 Volvo V50

[Rich H]

Balance motorsport is the guy how starred in the PPC mag article I saw.
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[vexed73]

The problem with this I think would be you would need to switch to EFI. It would be alot of pipes running back and forth using the CIS. Of coursse I am usually wrong so educate me?
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1982 PORSCHE 931

[Rich H]

Already EFI'ed up
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec