300+ hp on a stock engine - BMW Forum

EcianIce · 04-21-2004, 09:34 AM

I was told after posting my list of future mods that, if all done, the stock engine internals would burn up and baisicly blow my engine. So ..

I don't know anything about the internals, but if someone could tell me what needs to be replaced to handle the power correctly, I would love to know.

Anon_person_01 said fuel injectors, water pumps, camshaft, piston sleeves, and things of that sort would all have to be changed out. x.x

///M Power · 04-21-2004, 10:39 AM

Most of the items you have highlighted in red would not require major engine mods. i.e. shark, borla, grupe M, flywheel, dinan stage 3, spoiler, and wheels (note on the M3 rims you rears would not fit, they will fit only if you put on all front sized rims, or you roll the fenders).

what kinda major mods are you planning on doing? AA supercharger?

EcianIce · 04-21-2004, 11:02 AM

Yup. I don't have the supercharger on there yet, thats a grand finale for my mods, once that list turns green. a bold, ActiveAutowerks Supercharger will be added.

Thats when the major engine mods come in.

Mach 5 · 04-21-2004, 02:21 PM

I thought the AA supercharger came with new injectors. The system is designed to be bolt on and runs a relatively low boost so that stock internals do not have to be changed. If you want some serious boost though the compression would have to be dropped. Several companies make thicker headgaskets that will do this. It seems that most superchargers for the e46's top out at just over 300hp.
Ben

Furious · 04-21-2004, 03:06 PM

looks to me like your list isnt that volitile to your car. i wouldnt worry. now if you were to throw Forced induction into the mix , it would be a slightly different story. even then most companies take into consideration that factor. so you should be good.

EcianIce · 04-21-2004, 03:52 PM

i heard today that an M3 could have some type of header work done, where they can reach 400hp N/A. is this true?

if so .. i might be doing a trade in and board move soon.

thanks for the feedback on the tranny. as i understand, the exhaust, chip, power pulley and supercharger would run fine on stock engine internals.

still might talk to some pros in bmw work about it though. i love my car to much to let anything happen.

doughboyea · 04-21-2004, 04:15 PM

Now hold on a second... I'm not sure if this was spoken of before, perhaps it was.... If the M3 is a 3.2L inline 6, pretty much the same engine as in the other current BMW's (just a larger displacement) what is it that M does to bring out the N/A 333 horses? Could that be done to say a 330i or even a 328i?

My best guess would be the most obvious, exhust, headers, valves, pulley's, intake, computer and perhaps a stroker kit but could all that really pump out an additional 100++ horses?? Most likely would cost thousandSS but still. I do think that NA would be better, but then again, I'm no mechanic.

I hope in not detering too much from EcianIce initial post, but I saw that he/you were talking about getting a super charger.... Just thought i'd ask about this alternative

Dough

roguesniper1 · 04-21-2004, 04:56 PM

BMW's are not that easy to work on. The new engine in e46 max out at 333hp/na. OR 343 in CSL form but thats it. I don't think there can be a head work done which can give a boost upto 400hp. Second, you have 2.5L littler engine since you have 325i. EVEN if you were to super charge or turbo charge your car, you will need FORGED PISTONS to begin with. Then, different compression, bigger injectors, intercooler, camshaft, hoses, water pump, new ECU software and many many more things. AFTER every thing is done, then there will be the issue of reliability. Don't forget you will also void any kind of factory warranty.

Also, when you replace the fly wheel, there will always be a rattle at low rpms and clunking sound at high rpms. It is not hurting anything but the noise will be there because BMW uses dual mass fly wheel and single one will leave too much space. The only way around the noise is to use m5 fly wheel assembly.

ALAS, if you love your car our and are worried about the reliabilty, I wouldn't recommend any kind of forced induction. But if more power is your forte, go with DINAN. They will give you upto 48 months of guaranty depending on your engine history.

EcianIce · 04-21-2004, 05:14 PM

Quote:

Originally posted by roguesniper1@Apr 21 2004, 05:36 PM
BMW's are not that easy to work on. The new engine in e46 max out at 333hp/na. OR 343 in CSL form but thats it. I don't think there can be a head work done which can give a boost upto 400hp. Second, you have 2.5L littler engine since you have 325i. EVEN if you were to super charge or turbo charge your car, you will need FORGED PISTONS to begin with. Then, different compression, bigger injectors, intercooler, camshaft, hoses, water pump, new ECU software and many many more things. AFTER every thing is done, then there will be the issue of reliability. Don't forget you will also void any kind of factory warranty.

Also, when you replace the fly wheel, there will always be a rattle at low rpms and clunking sound at high rpms. It is not hurting anything but the noise will be there because BMW uses dual mass fly wheel and single one will leave too much space. The only way around the noise is to use m5 fly wheel assembly.

ALAS, if you love your car our and are worried about the reliabilty, I wouldn't recommend any kind of forced induction. But if more power is your forte, go with DINAN. They will give you upto 48 months of guaranty depending on your engine history.

ouch. x.x