turbo m20

[PatNy]

The thought of doing a M50 swap has been bouncing around in my head alot but i would love to do a turbo setup with my M20....my only problem is that i have an eta....so i thought why not stroke the eta out and then do a turbo setup.....my only question is doesnt the stroker kit give you headers?.....i thought headers are usless on a turbo setup....also how much power could be made by a turbo m20.....also what bore should i stroke my engine to a 2.9? 3.0?....which would be the best bore for turbo setup??.....thank you very much......

[E30godz]

hrm.....stroking the engine means nothing more than increasing the stroke of the crank....headers are just freeflowing exhaust manifolds, two seperate things.

As you already have an Eta, here is what i would do:

Buy a complete I head, intake manifold and throttle body
Bore out the block 1mm to acheive a 2.8 total displacment, you'll have to use custom pistons.
Keep the eta crank
Im not sure if the E exhaust manifolds are different from the I's, but in any case, buy the turbo adapter from pro-turbo, or get one made
Use a garret T3/T4 turbo, water cooled preferable as you can easily hack into the throttle body coolant lines.
Find a decently sized intercooler, (ie, starion/conquest) or get one of the big F150 turbo diesal ones and get a shop to hack it down to the correct size and make the endtanks.
Get a custom exhaust made out of the turbo from some exhaust shop.
Get the SMT-6 piggyback software to tune.
Ummm youll prolly need another clutch, so get the 6 puck disc from IE and use the stock pressure plate and throw-out bearing. (for lowish boost, although the exact numbers this setup can handle is not known)

Enjoy your turbo M20.
With these you could boost to your heart's content (well up to a point) as long as you have low compression pistons and access to 93 octane gas.

Anyone wanna guess on the power? i bet a 2.8 running on 15 PSI...would be well...a lot.

A guy named Noren on DTM posted about his M20 running 19 PSI and putting down 433 HP. Not sure if it was a 2.5 or 2.7+

[reelizmpro]

In Europe there are 2.7 M20 turbo's making 400HP. I'm sure the engine was based on the M20B25. I've heard of turbo ETA's making around 270HP running a lot of boost though. A standard bore of 84 or 84.5/85mm should be fine as you don't want to make the cylinder walls too close to each other especially on a turbo engine. As for the headers, you understand how a turbo is setup right? A custom exhaust manifold OR an adapter that flows the exhaust to the turbo is needed so a traditional header cannot be used. I'd say a 2.8 turbo is good enough.

[matt325is]

2.8l turbo is indeed a good idea (I have one). I plan on putting around 300 to the rear wheels. There is a lot of fabrication involved when making a turbo m20, since the kits out there are quite inadequate (only 1.75-2" pipes, t3/mitsu 16g turbo's) for high horsepower).

As for the clutch, I contacted IE and they said their racing clutch might not be able to handle that much power (theirs does not come with an upgraded pressure plate). So I would recommend either Centerforce or http://www.bimmerworld.com/html/clut...lutch-kits.htm . I have the centerforce dual friction clutch and seems like a quality product, I still have about 200 miles on the break-in so I havent opened it up yet (and its been icy and snowey for the last week, so I have to wait even longer).

If you are looking for a LOT of horsepower you might want to invest in a 524td crankshaft (forged) instead of the ETA crankshaft (cast).

An intercooler is pretty much a must, even if you have low compression and run high octane gas. A Water -> Air intercooler would be very efficient, but a little more costly. They also take up less room if you dont want to remove your A/C or other parts.

Good Luck,

matt

[808BMW]

Wow, kinda close to my plan :P

I plan on going from a standard m20b25, e crank and conrods, super-e pistons, leave the low compression and add a turbo.
Something like 6 pounds max, I want it to boost early and just hold a linear boost curve, no big numbers, just as smooth as I can get it :P air to air intercooler because I'm a ricer and plan on having a humongous(sp?) bumper anyway :P

2.7i on 6 lb.s of boost... any number anyone? I'm hoping for 250 to the wheels... It's do-able.

[PeterCip]

I have the 6 puck clutch from IE and it holds 300ft lbs of torque no problem.
matt, MS = blown chip.. did I mention that I was through the entire install? and that I have horrendous luck??
limping on the Mass air conversion. anyone want it??
if you have any questions about the turbo M20, ask me anytime. I have one and I am almost done with the website.. waiting to finish the MS and I have been very lazy...

[PatNy]

sounds good thank you for the great response......so for now im gonna work on stroking out the engine to about a 2.8-2.7 between there........i hope to make those 300+ numbers that were stated before would be a dream come true......do any of drive your turbo m20's daily?

[E30godz]

I will be shortly.

my setup is as follows

19# injectors
Vortech 12:1 FMU
SMT-6 piggy back system
Turbo Adapter
T3 60 trim, stage 3 turbine
uprated 12.9 headbolts
Starion/Conquest FMIC

Im running on a stock 325i with 125k on it, i plan on boosting 7-8 PSI and 200 RWHP is my goal. I also plan on DIY'ing a waterinjection kit to kick in around 4-5 PSI, i may then increase the boost to 10 pounds or so.......then a new clutch is in order.

Be careful, this shit adds up quick!

I also bought a shit load of random parts. Too many to list

[bmwannabe]

to reitterate, these turbo applications you talk about take hours and thousands of dollars to fabricate/tune/maintain/build. if you didnt initially know that you couldnt use a header in a turbo application, youve got some research to do.... not trying to discourage, but before you blow a couple grand on parts, know exactly how hard its gonna be.

[gstuning]

2.7 on 6psi is not going to make 250rwhp unless otherwise modified,

but don´t worry boosting 8-9psi is going to work also and will probably make 250rwhp,

[808BMW]

2.7 on 6psi is not going to make 250rwhp unless otherwise modified,

but don´t worry boosting 8-9psi is going to work also and will probably make 250rwhp,

I was going simply off the fact that most people say a 2.7i should make at least 200 rwhp, and usually more. Add 10 hp per pound of boost (I forget who told me that) and I'm looking at 260+, add in some reality and I'm hoping to hit 250 :P

With the right tuning (SMT-6 + MS) do you think that 6 lbs. is too low boost for 250 rwhp?

[Bryson]

a 2.7i will barely make 200 crank hp, if it even does, that's, what, 170rwhp? ouch

[JPbmw]

werd^^

My plan is to make my eta a 2.7i and then put a turbo running about 7 psi :P

[E30godz]

you dont need MS AND the SMT-6. I see the SMT-6 being advantageous over the MS becuase:

A) it control ignition timing
B) quite easy to use
C) no assembly required (aside from the simple wiring)

now im not saying MS is a BAD system, its very powerful in the hands of those who know what they are doing, as are most tuning devices. I was even planning on using MS for a a while before i switched to the SMT-6

[EtaSport]

Im not sure if the E exhaust manifolds are different from the I's, but in any case, buy the turbo adapter from pro-turbo, or get one made

The manifolds are the same, the e's just have smaller ports.
Where can I find a pro-turbo adapter? Would it be just as good as using, say a 524td manifold? Or is the pro-turbo adapter now what I am thinking and is just another type of exhaust manifold?