Hey guys, my friend owns a BMW 2002 carburated 2.0L. He was thinking of putting a turbo on his stock engine(rebuilt a year ago). I was wondering if people have turbo'd the 2002's before? Also what will I need to Turbo the engine? Will the carburator work with the Turbo? He is currently running a Webber carburator fairly new. And also how much boost can these engines withstand?

I have a pretty good understanding about how turbo's work. I just want to make sure I have everything i need. Thanks

stock can be boosted, your going to want to megasquirt it though, it's a whole lot harder to setup with carbs

boost is relative to what his compression ratio is, the key is controlling fuel & timing along with boost, stock engines components you really cant control much, you need to go digital on both, megasquirt & eids is the easiest route

from my understanding and research, the 02 engine block can take a huge amount of boost, say 2-4 turbo's worth

Cartech, Calloway and BAE all made turbo systems that bolted onto an M10 and used the stock internals.

A conservative estimate for boost would be around 8-10 psi with the stock compression provided you use decent gas (93 octane) and do not let it detonate/ping.

I definitely encourage EFI in lieu of carbs. The technology is all around you to make a fuel delivery system that you can control rather than one that you continuously have to deal with.

Search for threads by "Good and Tight", I believe he is selling a fuel management system for an M10 after experiencing a rather horrific engine failure. Don't let his grenaded motor frighten you away from turbocharging. Otis was generating almost 4 times the factory rated power at the crankshaft on stock internals. I do not recommend going quite that far unless you like rebuilding motors often.:nono

Stock compression ration on a 2002 is about 8.5:1 Perfect for a Turbo. Good guess would be 250 RWHP with out doing anything to the internals. I would suggest some aftermarket head studs like ARP.

Whats Megasquirt?

megasquirt is do it yourself fuel injection

the 2002 is easier than most other cars to convert, later model bmw fuel injection manifolds bolt right on

for spark a ford EIDS trigger wheel setup is the easiest way to go digital spark, megasquirt controls this too

If you are not the DIY kind of person who might want to program their own fuel injection setup there are many people who have sold kits for this kind of conversion.

Some after market conversions are even based on simple Bosch systems. I understand that the early e21 320i had a CIS fuel injection system with a MAF that would automatically compensate for mild boost. Retrofitting one of these setups might be easier but notably less configurable should your needs change and you desire more performance later down the road.

I though the 320's had a flapper box like the E30

I have a 320i manifold, it bolts right onto our 2002's, most use a jeep TPS's on the front end of the manifold, and a full range o2 sensor, I forget what the o2 sensors are called, spendy though, you have to buy a sensor and controller to use it with your setup.

I forget what the o2 sensors are called, spendy though, you have to buy a sensor and controller to use it with your setup.

Wideband.

Mega
I see you are a woods rider[EE handgaurds], nice choice of bike! I ride a destroked 450 [400cc] that was one of Lafertys works bikes. Will be snowing here so its put up till spring. You are lucky, being able to ride all year.

Larry

How is your car coming, Mega?

Aright so Fuel Injection would be my best bet.


But lets say I wanted to stay carburated, what would I need for a low boost setup?

In that case you are pretty much on your own on the 2002, I doubt you'll find anybody running one.

Pretty tough to stay with a carb. You would have to build a pressurized air box / intake.

I've only seen a couple of them done, it's very hard to tune them

Although Carburettors aren't the best method for fuel delivery on a turbo car, here are two ways that they can be run:

Draw through

The carburetor feeds directly into the inlet of the turbocharger. The advantage of this system is that it is much, much easier to tune. The disadvantage is that you will probably need a special type of seal on the turbocharger since fuel is also being compressed with air. Also, these types of setups can't use intercoolers.

Blow through

The turbocharger feeds the carburettor. In this setup, you have to have a box built around the carburettor to section it off from the rest of the engine bay. Advantages to this system are the ability to use intercoolers and standard turbos. The major disadvantage is that tuning the carburettor for boost will be hard.

Hope that helps, I'm not an expert by any means but I found that information when doing research for my own setup. Check into the first generation rx7 owners and te72 corolla owners as they are known for running carb- turbo setups.

I have seen both systems that cheech was talking about on cars in Scandinavia. Big honkin' weber sticking out where the battery is located on a stock car. I wish I had some pictures, maybe Harry has some of these cars.