I am still doing some research, but thought I would drop a new thread in hopes for a quick answer.
I am building an M44 with a DASC kit to put in my e30:
M42 Crank in an M44 to drop compression ratio to around 9.5, Straight intake running MegaSquirt off of MAP, 42# injectors, stock cams, Full length headers, 3" exhaust, map switched to run 91 octane on the street and 99 octane on the track.
I have a crank pulley from a 1998 318ti (6-Rib, measures 5.75" on the outer lip). I calculate it to run the M62 blower at 13,824 RPM at 7,200 engine rpm with the 3" pulley that came with the kit (bought it used off of an e36 M42, not sure what pulley size that is).
I want to max out the boost/hp within reason and figure 12 psi will get me what I am looking for. I know thats on the outer reaches of that compression ratio, but with the MS and knock detection, I figure its worth a try. I cannot find any solid info on what psi to expect out of this set up at those redline numbers. I could get a 2.75" pulley for the blower, to get the blower up near its redline (at engine redline), but I am not sure where that would leave me considering the potential for diminishing returns. I do not plan on running water or methanol injection. The blower is old and the rotors have a few nicks and some of their coating is wearing off, so I don't want to spray them and I don't want to spin them any faster than I need to.
I am also uncertain as to where to start with my cam settings. I am going to keep the stock M44 cams, but I figure I should tune out some of the overlap.
However, I am not sure which direction to take which cam.
I figured I would start with both at a neutral setting, but I don't know enough about where that leaves them to know if that is best.
Any help is appreciated.
Thanks.
J. Farina
Big Fish Motorsports
I am building an M44 with a DASC kit to put in my e30:
M42 Crank in an M44 to drop compression ratio to around 9.5, Straight intake running MegaSquirt off of MAP, 42# injectors, stock cams, Full length headers, 3" exhaust, map switched to run 91 octane on the street and 99 octane on the track.
I have a crank pulley from a 1998 318ti (6-Rib, measures 5.75" on the outer lip). I calculate it to run the M62 blower at 13,824 RPM at 7,200 engine rpm with the 3" pulley that came with the kit (bought it used off of an e36 M42, not sure what pulley size that is).
I want to max out the boost/hp within reason and figure 12 psi will get me what I am looking for. I know thats on the outer reaches of that compression ratio, but with the MS and knock detection, I figure its worth a try. I cannot find any solid info on what psi to expect out of this set up at those redline numbers. I could get a 2.75" pulley for the blower, to get the blower up near its redline (at engine redline), but I am not sure where that would leave me considering the potential for diminishing returns. I do not plan on running water or methanol injection. The blower is old and the rotors have a few nicks and some of their coating is wearing off, so I don't want to spray them and I don't want to spin them any faster than I need to.
I am also uncertain as to where to start with my cam settings. I am going to keep the stock M44 cams, but I figure I should tune out some of the overlap.
However, I am not sure which direction to take which cam.
I figured I would start with both at a neutral setting, but I don't know enough about where that leaves them to know if that is best.
Any help is appreciated.
Thanks.
J. Farina
Big Fish Motorsports
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