Turbo or 3.0 Stroker?

[Moto-Mucci]

then when the time comes, supercharge it instead. you can still use your existing exhaust and headers, you just need to sort out the mounting of the charger and inter cooler piping. the power delivery is more like an N/A motor too

I agree with der affe. If the issue is not being able to choose between the eventual power of a turbo or the instantaneous power of an NA motor - then why not supercharge?

You can get all the power of a snail instantaneously like an NA motor. You also don't have to buy and install a new manifold, downpipe, wastegate, oil pan, oil lines, or intercooler (you could intercool - but a SCer wont make as much heat as a turbo since it's not exhaust driven.) On top of all that - less piping.

Grab a Benz Kompressor and make friends with a fabricator to make you some brackets. Maybe there's even a dece kit out there already. I'm new to the bmw scene so I don't know yet. Maybe someone can chime in about this.

If you're completely against supercharging, then I'd recommend piecing together your own custom turbo kit. I'm against handing my car off to anyone unless I absolutely cant do the work myself or cant teach myself how to do it in a moderate amount of time. You'll gain WAY more knowledge about your set up by piecing and putting together your own kit. If anything ever breaks you're also much more likely to know how to diagnose and fix it yourself. Ontop of that, you can do it for 1/2 the price - or less even. Both my VW's had custom turbo kits that I pieced together for under $1k, and after a couple times, I could tear everything down in about 45min myself. Like someone said previously, it's a lot simpler the most people first think.

...just my long winded

[diegom6]

Make it interesting. Im always for N/A. Takes more skill to make power without forced induction. Thats my opinion so dont get upset if you have FI.



Mariano

And deeper wallet ;)

[asubimmer]

I would say for a daily driver go for N/A for sure.

meh I wouldn't agree w/ you there. A turbo isn't gonna eat as much gas as a stroker. That is if you stay out of boost, ie DD :)

[JMil86]

I would say for a daily driver go for N/A for sure.

[BoostMW]

turbo that jernt, I think alot of people (average car owners)are intimidated buy turboing and don't know how simple it is to do under 12psi and would rather just stroke an engine and spend a fortune on making a 200hp car. I don't see spending 3k -5k for .5 displacement and 40-50hp. But it is just bragging rights in the end.

This cost me 1200 do it my self,including studs,injectors rrfpr,manifold,etc>289whp at 8psi wastgate. Stroking cost way to much for final outcome ,but i really want to buy a car that someone else has stroked and took the loss on,lol

[e28forlife]

Also note that with the TCD kit, you don't need to run MS. They tune the current control unit, saving some headaches.

I also reckon you could build your own turbo kit, with a flashy top-mount turbo and front mounted intercooler. This could be done on the cheap as well.

And if you are building a 3 liter stroker, I would suggest staying near stock compression ratio, unless you are sure you will be going FI soon. It would be rather disappointing to put all that effort into the m20, then leave some power on the table while counting on turboing it down the road.

[e28forlife]

I reckon you have three options:

1). Bore and build the engine you have now. Ireland Engineering makes 3, 3.1 and 3.2 litre kits, None of these are cheap, and there would be necessary intake, exhaust and tuning work to take full advantage. I imagine a well worked 3 liter m20 would cost $6k plus, with all the required labor etc. It could cost considerably more if you go just a little bit more in depth

2). Engine swap. Depending upon what engine you use, this can be the cheapest option. You could do an m30b35 out of an e34 for pretty cheap (-$1000). A chip, MAF conversion, and exhaust would all give pretty reasonable gains. The mark D ship shows an increase of more than 30/30 hp/ftlbs tq.
An m50/m52 swap would cost a little bit more, but there is a ton of info available on the swap, and a large aftermarket devoted to these engines. The cost for the engine itself would be somewhere between the m30 and s50.
The most highly regarded of swaps would be the s50/s52 which is the most expensive options. The engine/tranny itself is upwards of $4K, and then you have to add in labor and the swap related parts. This can all be pretty costly.
3). Turbo. If your engine is in good shape, you could just buy the TCD (turbo charging dynamics) m20 kit, in either intercooled or non intercooled form. With the intercooler, its near $5000. If you add in a clutch, thats another $600 or so, and the same for an exhaust. This will by far give you the most horsepower.


I don't see a 3liter m20 producing any more horsepower than a 3 liter DOHC s50 engine. The only upside to that route would be cost (although the parts and engine work are not cheap, so I'm not sure how much you'd save) and the fact that you do not have to deal with any of the swap headaches. The TCD kit is the route I'd go, as even a fully modified s50 with cams, intake manifold, exhaust etc only puts out ~280whp. The stage 2 TCD kit is rated at ~300whp/300 ft lbs torque, and would have the least headache of the bunch. There would indeed be extra weight when compared to a built m20, but I think it would be a reasonable sacrifice, even in a car that will be tracked. As for auto-x, I would just concentrate on suspension.

[chameleonleather]

A shop would source the s50 and install it for 5k? That's a great price, Im looking at that much for the 3.0 stroker.

[uofom3]

5k i would say is reasonable for everything.

[chameleonleather]

Ok, lets put it this way. How much should it cost for an s50 swap?

[uofom3]

s5x+ms3+ITB's+CF airbox = win.

if this is something you can't afford - just do the s5x and cam/chip it. plenty of go for most people.

[chameleonleather]

bump

[der affe]

P & P isn't really that hard if you just gasket match the ports and clean up the chambers. it is boring as fuck! and takes for ever. i would suggest that you get a junk head first and screw around with it. if after you get finished with the junk head you thing you can handle one that counts, go for it. hogging the holes out won't do you any good though, polishing the chambers and intakes (Ala Jordon) won't help you either. remember that you need to match port the intake manifold too as well as match the exhaust ports to the header that you are going to use.

build the motor like you were going to turbo it (good bolts, ETC) put total seal second rings and oil rings. with a Dykes top. weld in the bung for the oil drain a head of time and cap it off.

then when the time comes, supercharge it instead. you can still use your existing exhaust and headers, you just need to sort out the mounting of the charger and inter cooler piping. the power delivery is more like an N/A motor too

[chameleonleather]

I would like some helpful info on port and polishing. I have been researching it and it looks pretty straight forward with some skill involved.

[dashboardmonkey]

Stroke it