ok i have a question, it might be completely rediculous and undoable, but wht would it take to turbo my 1974 2002? what all would need replaced with tii parts and what would be ok to leave the same?! also, i was looking on ebay and other place and turboes for bmw M3's are a lot more readily available and less expensive and i was wondering if there was any way possible to use this instead of a tii turbo. probably more questions to follow up and any help would be great!!!!

You have asked an excellent question and I feel the 2002tii is not the best candidate for adding boost. The tii is a fun car that retains the most value in OEM condition. From what I have read the KF injection system would be difficult to enrich and calibrate for boost.

If I had to engineer a turbo project from scratch I would start with the 1980-1986 M10 intake manifold that looks like an aluminum spider.

You will need to be capable of adding extra fuel to compensate for the increased volume of compressed air. The CIS injection on early 320i's was mass based and would compensate automatically up to a specific boost level. This was how BAE and Calloway were able to produce and sell affordable turbo kits.

If you decide to go EFI, larger injectors, fuel pump, regulator and a management system (either standalone or piggyback).

Leave the valve train alone and retain the stock camshaft.

Buy a copy of Corky Bell's "Maximum Boost". Excellent reference for DIY type work.

If you need a set of balanced injectors or a suitable turbocharger exhaust housing for a 1.8-2.0 liter motor let me know.

Here you go

http://homepage.mac.com/iandickerson/M2002/


It's a dream come true, along with an empty bank account.

The tii also had a 9.5:1 compression ratio i believe which isnt the best for a turbo application. Generally, 8:1 will be safe and allow you to run plenty of boost if need be. The main question though is how much power do you want and how much money do you have to spend...

For a good turbo buildup, check out Pinepig's project blog on the 2002faq forum

If you want to turbo your 2002 start by making the car EFI, don't bother with a CIS setup unless you want to be limited on what you can do.

Megasquirt works pretty good for what it is, there are other options but but you'll be out more dollars.

If you fabricate you're in luck because there is no such thing as a "turbo kit" ( except some old rare stuff $$$$$$ ) for the 2002 so making parts will be fun.

You can get a exhaust manifold from John Volk www.666fabrication.com and it's a nice unit but a tad spendy if you think your going to do this on a budget. The down pipe and intercooler ( and piping ) your own your own.

Don't let me dissuade you from doing it if you have the skills because a turboed 2002 is fun as hell to drive.

A pic of my nasty bay for inspiration, thank god I'm pulling the motor this winter to clean it all up, I can't hardly stand how crappy it looks every time I open the hood compared to the rest of the car.

http://i168.photobucket.com/albums/u197/Pinepig/turbougly2.jpg
http://i168.photobucket.com/albums/u197/Pinepig/turbougly.jpg

Also, 9.5:1 will actually work, you'll have a faster spool time. The only tradeoff is that you can't run as high boost as u can with 8:1 compression. Personally though I'd choose quicker spool over more boost.

My HX30 spools at 2000 and is at full ( 10psi ) by 2500 ( creeps to 16 by redline ) on a stock 8.3 to one block, how much quicker do you need it to spool:redspot, the Holset isn't tiny by any stretch. With the crappy combustion chamber our cars have you'd be lucky to get away with 7psi on a 9.5 to one motor on pump gas.

I affirm the comment that 8.5:1 is plenty of compression with a properly sized turbo.

I ran my supercharged M10 to almost 12psi while @ 9.5:1 and broke two piston main ring lands. It was also hard to keep the car from pinging.

Initially I dropped my compression to 8.1:1 when I installed a small turbo. Off boost seemed a little less responsive but the small turbo didn't fair so well approaching 7000 RPM.

I increased the CR to 8.5:1 and went from a .40 to .58 A/R on the new Garrett turbine housing and everything seems to work very well together. Great off idle responsiveness and very linear transition to boost.

Have not measured the backside pressure on the larger turbine but egt reading are much lower and the car is a blast to to drive on the streets with 93 octane. Not finicky or laggy like some turbo cars.

ok, thanks a lot to all of you. i cant do a lot of fabrication myself. im only 17, but my dad is a former mechanic and is up for helpin me some. i just gotta make more money so i can start the project!!

ok im trying to get a little more serious now. i got about $2000 to get started. its not a lot but it'll get me started. for those of you that have done this, wut kind of turbos are you using, and how much boost are you running? also, do you just have the intercooler sitting behind the grill or where is that i cant quite tell from the pictures? how big is the intercooler and what is it from? and what is this megasquirt that you're talking about? sorry for all the questions, but im just 17 and new to the BMW stuff. any help would be awesome! thanks!

ok im trying to get a little more serious now. i got about $2000 to get started. its not a lot but it'll get me started. for those of you that have done this, wut kind of turbos are you using, and how much boost are you running? also, do you just have the intercooler sitting behind the grill or where is that i cant quite tell from the pictures? how big is the intercooler and what is it from? and what is this megasquirt that you're talking about? sorry for all the questions, but im just 17 and new to the BMW stuff. any help would be awesome! thanks!
How much power do you want?

as much as possible for a budget.....

what all do u have for your turbo setup to be running 12.6's?....ik ur thing says no mods but just in respect to the turbo what does it have??

This is the 12.6/7 kind of setup...

http://www.bavariacars.com.au/article/?id=58

IIRC, its running a GT28RS or "Disco Potato" now. It was running a GT25 for a while.

is a garret t25 or t28 similar to either of these?