Originally Posted by black328is
ok I'm a newb to bmw's and to boost, and now I'm trying to put the 2 together. ok, first off, what will I have to do to the computer to tune it? I'm sure to a degree the MAF will compensate for the increased airflow, but would it be safe to run it on the boosted side, or should it go on the inlet side? also I know that timing will be affected by adding boost, so what would be done to compensate? is there a chip/programmer available to make the necessary changes? are there any significant changes in fue mileage? will it mess with any of the factory electronics and metering systems? I already have to pull the head to regring and resurface the valves, so what, if any, internal mods should I need to do? should I go with a different type of head gasket? higher strength head bolts? also how much boost will the stock internals handle? or, how much spray could I safely run without boost? what would I need for that? if anyone knows any of this it would be great, or a link to where i can find this stuff it would be much appreciated. just trying to decide my best option at this point. I mean, I already have to put money and work into it, might as well do something nice with it while I'm at it
#1- i wouldnt run any boost without proper ecu correction
#2- you can place the MAF on either the intake or charge pipe but will requir different piping.
#3-Nick G on bimmerforums can do OBDII tunes and he's one of the best.
#4if you use the stock ecu with a tune you will retain all of your functioning electgronics
#5-fuel milage? if you boosting then what are you worried about fuel milage for?
#6- you dont "need" to regrind you valves, or atleast you shouldnt.
#7-stock internals have been proven to hold up to 704hp at which you will bend a rod.
heres what you should do:
#1- get a .140" MLS gasket from http://www.vacmotorsports.com/cgi-bi...pl?item_id=562
#2- get some ARP head studs from the same place http://www.vacmotorsports.com/cgi-bi...pl?item_id=231
#3-Follow these directions on the head gasket and studs installation http://forums.bimmerforums.com/forum....php?p=4223788
besides all of the other Fuel, cooling, vacume, exhuast,etc,etc stuff.
thats all the internal stuff you NEED to do to boost 15-17 psi safely with a good tune.
Which can produce 500whp.
For you, assuming you knowledge of turbo systems . I'd strongly consider a technic tuning kit.
even if you start with stage 1 you can upgrade later if you want.
trust me! Its a complete kit and you CAN NOT beat the price by doing it your self!!
GET IT! it will save you LOTS of headaches and down time.
Originally Posted by witeshark
IMO Beefing up the crank and main bearings would be a good start
No need to "beef up" the crank or bearings unless they are severely worn.
Like i said. the stock 2.8L with only a .140" headgasket and ARP head studs has proven 704hp.
Stock cams, stock piston, stock rods, stock everything!
the rods were the first to fail and not untill 704hp.