fraser9764

iTrader: (3)

is this a completely stupid idea?
i'm not thinking fire hazard or protection from stone chips etc. but would it actually work

RWD_cossie_wil

iTrader: (9)

wtf?

haz87

I'm sure someone posted this up a while ago (or similar). Think it was done on a mini with reasonable results

Jim Galbally

yes they work, lots of yank turbo conversions are like this as it's faiyl easy installation, just not idea for power/driveability

Porkie

iTrader: (1)

Stav loves these and knows alot about them

Jonzy

Didn't one the the bigger bmw 'tuners' recently do the same thing to some high spec bmw?

MAD matt-sab

saw this on here a few months ago on a MX5
i liked it
nissan 200sx rear diff cooler and oil pump
all do able and cheap ISH !

smithy20vt

I think i remember someone posting up a few pics of a new shape M5 with a twin set up like that.

JonnyBravo

Yep I also read that, quite cool imo

Graceland

Intersting.................More info please

foreigneRS

looks like a reasonable install, but i would've used an aluminium pipe from compressor outlet with some fins on it as it would cool the charge better than the steel one and be lighter

xr4x4rs

iTrader: (5)

mustang one

http://www.mustangv8.com/en2/uploads...517c49e78f.jpg

Chip

iTrader: (3)

Agreed that heat on that setup could be an issue.

The other thing to remember is that if you have any holes in your exhaust they will bloke like a bastard as you end up with pressure the WHOLE way down not just in the manifold like on a conventional setup.

If you can manage those two things though, no reason it wont work well enough for lowish boost though.

Easy install too of course if you just run a remote oil reservoir and cooler and pump, as its all self contained (bit like the water cooling for the turbo on my nova which runs its own system.

Turbocabbie

does the length of the pipe effect lag ?

smithy20vt

I thought this was a mini?

dojj

iTrader: (3)

theres one in a recent issue of ppc

Chip

iTrader: (3)

Short answer is "yes"
Relevant answer is "not enough to make it not worth having"

Your engine if its a 2 litre at 6000rpm is geting through 100 litres of boost a second.

dojj

iTrader: (3)

it also saves the cost of specific intercooler locations as the run back from the tailpipe is enough to cool the charge into the engine, especially seeing as it runs underneath the car, and away from the exhaust if you route it that way

old86EXP

On this side of the pond STS is big into these kits. It's not rear mounted, it's 'remote' mounted.

http://www.ststurbo.com/

I guess what ever works.

CaftDunt

Here's Stav's post.
https://passionford.com/forum/general-car-related-discussion/238127-interesting-205gti-sprint-car-with-rear-remote-mounted-turbo.html

And a E60 M5 with remote turbos.

dovboy

pic i saved from a while back....

RWD_cossie_wil

iTrader: (9)

its a fucking lot of piping

foreigneRS

the underneath of a car is not usually very cool at all - most of the heat from the engine goes under there

i would have thought that off boost torque would be reduced due to the VE being reduced to having to breath through that length of pipe, but it's probably not significantly worse than breathing through an intercooler and a compressor anyway.

the air filter will need changing/cleaning more regularly, but it may well be sited in a high pressure area under there due to the rear valance. still warm and dirty though - the front of the car is the best place for the air intake, or out the top somewhere

Stavros

If you want pure performance then only a fool would mount it anywhere but close to the engine.

BUT for various other reasons it does make sense to go there, and certainly works.

TBH id say its hard/impossible for any of us to honestly talk about it, as we've never done it, and theory is massivley different to reality in most things with cars.

It's something I have in mind for a 351W I have lying around though to be honest. Just for interests and rooms sake as much as anything.

Id love to know the real difference in lag/threshold with identical turbos though, from what ive read the difference is fair, basically say if it was a GT35, a .63 housing but rear mounted drives like a 1.05 housing in the usual place.

tabetha

The one that was in PPC worked at least as good as a more conventional set up, and was not laggy at all.
tabetha

stevieturbo

There are cars in the US running 7second 1/4's with rear mount setups.

Nobody is saying they are ideal, or perfect. Why did they do it at all ??


Emissions laws in some parts of the US are mental, and you cannot touch any of the emissions control equipment.
So a front mounted turbo would be very difficult.

Fit it after all the emissions control....and suddenly you can have a turbocharger setup, that is quite legal ( oddly, the ecu tuning is ok as far as legality goes as far as I know )

The pipe run to the front is not enough to cool the air. That is just nonsense. It may cool a tiny tiny amount, but thats it.

Simple answer is that these kits are cheap, relatively easy to install, and give usable power gains.
So why not ? Most of the US cars are auto, as they dont seem to be able to change gears manually, so lag really isnt an issue.

Put your foot down, the car kicks down gears, revs its nuts off, and you have boost.

joffy

iTrader: (1)

if the length of the pipe affects spool up time is there no way you could have either a twin setup or even a supercharger for the low down revs then the rear mounted one could be as big as you wanted because you have no space issues?? or have i completely missed the point??

foreigneRS

nobody really knows if the spool up time is significantly affected by the length of pipe - i doubt it as you have such a huge volume (mass) of air going through the system that the pipe lengths are insignificant

probably more significant is the energy in the exhaust gas that will be reduced by the temperature drop over the long run between exhaust valve and turbine - lag it or ceramic coat it and it may help. as stated earlier though, you will have a lot higher pressure in the downpipe and exhaust system than normal, so it has to be well joined together with no leaks

joffy

iTrader: (1)

i thought by changing the exhuast manifold for a turbo car you could change the engine characteristics, ie the further away the more tourque but less throttle response and vice versa??

dojj

iTrader: (3)

if the turbo is close to the engine, don't you have to make sure you have even length pipes to it to stop it from haing a negative effect?

with the turbo at the far end, you will have a much better constant flow of gasses to spin it up yes?

the other thing is that when you rev an engine, it takes a matter of portions of a second for the exhaust gas coming out the tail pipe to start spewing out, so i don't think you've have much of a problem spinning a turbo up that was rear mounted

plus there wouldn't be as much heat in the engine bay to melt stuff

stevieturbo

Of course the length and heat issues will affect lag. But dont forget, most of these setups are on large capacity engines. SO it isnt so much of a problem.

pa_sjo

... and they're mainly on drag cars, where lag isn't an issue.

stevieturbo

Absolutely not. Pretty much anything that directs the gases into the turbo, will work. It doesnt need to be fancy, smooth, or anything really. Of course free flowing helps, but it is not essential.
If anything, its sharp pulses that really kick the turbine into action as opposed to smooth flow from each cylinder.

Lack of heat in the engine bay is one advantage too...plus its also very discreet for those that dont want to advertise the fact it is turbocharged..


pa_sjo.

These were originally designed as a cheap upgrade, for strict emissions control cars. They are not mainly on drag cars. They were designed primarily for road cars. But as many are autos, as I said earlier, lag is less of an issue, as the auto box helps that out. But quite a people use them for drag cars too now.