bmw m20 turbo conversion??

[The Meathead]

Was woundering if anyone on here new anything about turboing the old m20 12v engine?
wat the limit's are?
wats involved?
cost?
and wat would be a good size turbo? i was thinking an old cosworth turbo?

any advise and tips cheers!

[gaz_moose]

speak to gunni i think he's called gstuning on here

[gstuning]

It´s a case of how much you want.

They don´t bend rods and don´t blow pistons. Highest I know of on standard internals is 475whp.

ARP headstuds
depending on compression ratio (MLS gasket for 9.7, paper for 8.8 )
55+ mm inducer turbo

Don´t get a old turbo.
It´s pointless to try and build a crap setup.

You´ll need a ecu, injectors, clutch, new "3 exhaust. massive intercooler.


First though. How much power are you looking for?

[The Meathead]

right for starters mines a m20b20
they kinda hav a bad name but i like em lol

was thinking of about 280-300 rwhp
i want it to be quick and hav plenty of torque for drifting

wat would be a good turbo for that kinda powerz?

[gstuning]

Holset HX35

First of all I have a 2.5 without a head that you can get for 50pounds
just get another head and your gold. I can give you intake manifold with the short block

a 2.0 will be struggling for 300whp.
2.5 with stock head and cam will need about 1.2-1.3bar of boost on a HX35.

[Mike@TDSW]

GS what sort of cost/effort would it be to turbo m50b25 to 280-300 level?

[gstuning]

Still going to need

Clutch
Turbo
Turbo manifold
wastegate
intercooler
plumbing
injectors
control mechanism for controlling fuel.
downpipe
exhaust

Expect the same cost for 280-300hp as 400hp on a M50( cirka 3-5k depending on resourcefullness)

Infact, add MLS gasket + ARP head studss and you´ve got 500hp

[big fat nick]

so m50b25's are bombproof then? That sounds pretty awesome! I'm surprised there arent more kits floating about in that case! Hows about the gearboxes and rest of drivetrain?

[gstuning]

They last. May need stronger axles when you go sub 10sec 1/4mile.

Nothing is bombproof, it´s all in the tuning and not overreaching the design.
The problem is your RHD setups. It just hasn´t ever cought on making kits that fit RHD BMW´s. While there is plenty of LHD kit´s.
Problem beeing that people usually go for bottom mounts , but that fouls the steering linkage on RHD cars.

[The Meathead]

ok so holset hx35

that 2.5 block you hav
a new head, inlet mani and exhaust mani.
frount mount intercooler
an ecu that can handle the new setup
plenty of time and effort
and a fair chunck of money

im looking to save up some money and do it next year
but can start collecting parts now

[gstuning]

+ injectors
+ clutch
+ exhaust system "3

I can get you most if not all of those things in due time.

[Ooomoo]

there looks like a pretty good turbo manifold on ebay for £130, im planning a 2.5 turbo build soon

[The Meathead]

sweet! cheers dude,

ill start saving up lmao
so how much will i need all in?

[gstuning]

Depending on how well you can find parts it can be anything from 2k to whatever you can imagine.