E30 with rearmount turbo

[e21Jason]

Hi

I just thought i would share a few pics of my friend pete's e30 rear mount turbo build from the states

http://s15.photobucket.com/albums/a358/ ... ports/e30/

Jason

[maxfield]

[Yaninnya]

Hi
I just thought i would share a few pics of my friend pete's e30 rear mount turbo build from the states
http://s15.photobucket.com/albums/a358/ ... ports/e30/
Jason

O.k. I will be friendly and I will only ask - why?
Jan

[e21Jason]

Hi

Why not when you work out the pros and con's it's not so bad it's meant to be a low buck set up not mega power, that car puts out over 275hp with this setup.

Cheaper as you do not use a turbo manifold and the return pipe to the throttle acts like a heat sink to reduce the need for a intercooler, the distance from the trottle body to the turbo is not much more than normal, lower underhood temps, cooler intake charge, and better weight balance.

A company called sts has been developing them for a while

http://www.ststurbo.com/home

Jason

[Yaninnya]

Hi,
And massive lag, unbeliveable problems with oil feed and return to/from turbo, quite cold exhaust gases (a lot less efficient), a lot bigger problems with whole inlet piping. Do I need to say more? And in most cars you can make just special adaptor between manifold and turbo. And don't belive that feew meters of pipe are as effective as IC. It is just not true (even not close to truth).
The whole idea is typically american. If something is possible to do it not means that it shoud be done.
Jan

[tim-ix]

Got to agree with Jan on this. I can't think of a much worse place to put the turbo. Given that he seems to have had to cut out his boot floor I can't see how he's avoiding any hard work either.

The turbo lag must be immense and I don't believe anyone who says it's not.

[Turbo-Brown]

think we're all agreed that rear mount turbos are a waste of time!

[Gunni]

Nobody is going to argue with that.....

[tim-ix]

Well come on, someone must want to argue that rear-mounted turbos are the best modification since the electric supercharger.

[buster]

i dont think its a bad idea !

[cypriot_boy_2k7]

im confused how does this all works?? and how much are the kits?

[ric325i]

the old indie cars had rear mounted turbos but lag didnt matter as they did loops at constant speeds and if i am right they all did/ do rolling starts?

also they are American and dumb.

on a track or road car

so i agree with turbo-brown but it was good to see something different

[327ire]

I guess all of you guys have turbo e30? and have spent stupid money on them? The way I see it, why spend 3000 - 5000 on more power when you can just sell your car and buy an e36 m3 evo for the same??? A proper n/a bmw?

OR

put a turbo at the rear of your e30 and improve power without wasting thousands that could be spent on YOUR LIFE

Read this months Practical Performance Car Mag and see for yourselves before knocking it. The GTI drives well after the turbo. Im just beginning a rear turbo setup so Ill let youz know how it goes. Maybe your right, maybe your not

[Colonel Sanders]

I guess all of you guys have turbo e30? and have spent stupid money on them? The way I see it, why spend 3000 - 5000 on more power when you can just sell your car and buy an e36 m3 evo for the same??? A proper n/a bmw?

OR

put a turbo at the rear of your e30 and improve power without wasting thousands that could be spent on YOUR LIFE

Read this months Practical Performance Car Mag and see for yourselves before knocking it. The GTI drives well after the turbo. Im just beginning a rear turbo setup so Ill let youz know how it goes. Maybe your right, maybe your not

because i have owned an e36 m3 and it was crap.....
why shouldnt people spend there money how they like?

[DanThe]

The way I see it, why spend 3000 - 5000 on more power when you can just sell your car and buy an e36 m3 evo for the same??? A proper n/a bmw?

And be restricted to a lower level of emissions?

I dont think so!!

[oldroydsr4]

I guess all of you guys have turbo e30? and have spent stupid money on them? The way I see it, why spend 3000 - 5000 on more power when you can just sell your car and buy an e36 m3 evo for the same??? A proper n/a bmw?

Because your limited to slightly over 300hp with a e36 m3 (and you look like a chav), 1bar of boost through an m20 and the result is approx 350bhp[/quote]

[Tom-Tom]

Well, at least he can say it's a bit different, and if it's what he wants, then more power to him. Or not, as the case may be.

[fuzzy]

I guess all of you guys have turbo e30? and have spent stupid money on them? The way I see it, why spend 3000 - 5000 on more power when you can just sell your car and buy an e36 m3 evo for the same??? A proper n/a bmw?

yes. yes. and id rather have something fast and exciting rather than a boring uninspiring e36 m3.
turbos give that excitement although im not sure about this rear mounted option.

[cypriot_boy_2k7]

but what about a m3 e36 turbzz

[jaistanley]

I don't think its a waste of time.. I just fail to see the point on an E30 that's easily to turbocharge the conventional way. If you get more power then it was worth it, it just pains me as it's a poor engineering exercise.

I certainly wouldn't fit a rear mount turbo!.. I spose some people absolutely have to have more power, have a car that really can't be turbocharged the conventional way and don't have engineering degrees so don't have to swallow that particularly bitter pill.. lol

Diesel turbo's would be more suitable for this kind of thing wouldn't they? (Due to the lower exhaust temperatures).

[drifty325i]

I wouldnt do it to mine BUT i still think its pretty cool and the build quality looks good. Id say it would sound pretty sweet to

[DRIFTBOY]

I say good on him!

It's good to see someone going against the grain and daring to be different.

I've been doing a lot of reading on turbocharging lately in preparation for my conversion, and everything I've read so far would suggest that a rear mounted blower isn't as bad as people make out for moderate boost levels. Not good for much above 1 bar though.
And to be honest 275bhp in an E30 isn't to be sniffed at!

A bit like the Mazda rotary engine, people fear the unknown and criticise without fully understanding first.

[e21Jason]

Last year every body though wis was a stupid idea and now a pug with a rear mount turbo gets the glory.


If think the e30 work is good, you should check e12 535i with an ls1 that looks stock from the outside, or his e21 with a tuned ls1 mounted 50cm back in the engine bay and a e36m3 suspension conversion.

Jason

[rob0r]

^^^^ Pics are needed!!

[ric325i]

well if it works it works.

and teh pug in ppc seems to work really well. the idea a pea shooter exhaust to keep up the exhaust pressure seems to be the key.

great system.

[jaistanley]

I haven't got PPC for ages, is there one in there? My local mag shop doesn't carry it and I live in the sticks..

I was thinking the exhaust would have to be in really good nick. I can't see how the exhaust diameter would make a massive effect on pressure at the turbo. Venturi's law (I think it was venturi's, one of the thermodynamic laws anyway) states that pressure/volume/temp remains constant (think putting your finger over a garden hose). The smaller diameter would keep gas velocities and pressure in the exhaust high, but the energy would have to come from somewhere so it'd cool down fast. I spose there's nothing to stop you running a single pipe with exhaust wrap all along it's length..

Sounds fun, but like I said above, why do it when it's so easy to 'charge the M20 the conventional way?

[Jhonno]

Bernolli's Jai

[jaistanley]

God.. Three years of thermodynamics just came flooding back.. Time to hit the beer again...

[Jhonno]

Tell me about it.. If you dont know the answer put Bernoulii's.. It'll probably be right

[FormerMember]

Hi

I just thought i would share a few pics of my friend pete's e30 rear mount turbo build from the states

http://s15.photobucket.com/albums/a358/ ... ports/e30/

Jason

Hahah, this is hilarious

"only in america" or what?

Ok, it may work, and no reason why it wouldn't work, but it's no way better than "normal" setup. Longer piping => more lag, more pressure & energy losses, complicated piping etc etc.

I just can't see the reason to do that kind of setup. And btw, you sure that air-intake is in it's best place in the boot?

Weight distribution? Yeah right, the turbo weights maybe 20-30kg which is easily compensated with good suspension, and that car doesn't look like a race car so it doesn't matter anyways.

Did you port and polish your head like this also?



And sorry being a little harsh, but that's just how the cookie crambles

[jaistanley]

That picture deserves a thread all of it's own.. It's CLASSIC.. I can only assume it's a P take.

[d6dph]

I haven't got PPC for ages, is there one in there? My local mag shop doesn't carry it and I live in the sticks..

Martins newsagent in Witham stocks it, The bigger one opposite the banks.

Not too far from you either.... Or subscribe

[midnight]

i just dont understand these rear mount turbos, everyone has the filter under the car, what about when its wet??????????? water in engines dont make them go good. and what about the oil retun? its low pressure gravity return, how is it supposed to return to the sump or does it just go on the floor and keep topping up the oil, in my opinion its a pure scrap yard way of doing things, what ever though if ppl dont wanna spend money building a fast car, then listen to the hippies and buy a push bike

[crazymonk]

Can I just ask, if the point of a rear mount turbo is that it's cheap, and or fits where a turbo normally couldn't be installed, why has the car in the picks on the link gone to the expense of fitting a tubular exhaust manifold, and then cutting out the spare wheel well, when the turbo could have just been mounted normally, and lag would have been greatly reduced?

[DRIFTBOY]

For use with 5-10 psi they can be very effective.

Generally, a turbocharger with a smaller turbine housing and lower a/r ratios will help it spool up quickly, but it will limit the maximum boost it can produce.

A scavenge / return pump should be used to provide the oil feed and return.

It's not as desirable as a conventional set up but can still give useful power gains.