metric mechanics info

[stereomotional]

im building a turbo m42 and i was looking into cams.  i saw that MM's website has "turbo cams" which are 256 degree and 11.14 lift...anyways, who has oredered and or delt with them before? i see that the cams are $450 a piece, and the core is $250 a cam...meaning $900 for the cams...then $500 back?  or is the price including the core?  they really dont go into depth


thanks

[P. Kennedy]

Core prices are always factored in up front UNLESS, you send them your old cams right away.  So, up front, you're looking at $1,400 and MM would refund you $500 when they get your old cores.  OR...if you send the cores up front, it's a $900 outlay.  Somewhat confusing, I know.  I work in an auto parts store part-time and deal with it every day.

[stereomotional]

oh...damn

[strypt]

No need to change them unless you are aiming at 400+ hp.

[rob_e30]

No need to change them unless you are aiming at 400+ hp.

Not true.  I'm certain that we're running out of VE on the high end with our stock head and we're only in the area of 300 HP.  We could push more boost through but it's simply not efficient.  I spent some time with Jim on the phone and he really knows his stuff.  He was bringing up variables I didn't know I needed to think about.

Rob.

[strypt]

I disagree
Below is a dynosheet on a 318is turbo, 1.5bar boost, 333 rwhp, stock head, adjusted stock cams. lowered CR, ordinary pump gas.



http://www.pixbox.se/alb_show_id729877_page0.html <-- some photos from the tuning
http://www.youtube.com/watch?v=K_cmJh7gIcU <--- video, in the beginning only about 200 hp.

If I recall correct from what I saw on your dynosheet your max power was at around 5000 something RPM's? Cant find it now though...but if that is the case I think IMHO your cam settings is a bit off. How are they adjusted today or were at the time of the dynoing?

Edit: Of coarse this may not be ideal in any way but I'm just saying that it is possible with around 400 hp with stock cams and not insanely high boost. My opinion is therefore not to invest money in new cams unless your are going 400 hp and beyond.

[Frankie]

What are the other mods done to the 333hp is? Pistons, rods, ECU?

[strypt]

I don't know the details but CR is around 8:1 with pistons and/or rods from another BMW engine and MS+Edis ECU. Low budget build.

[D. Clay]

You gotta love that torque curve from 4500 to 6500. That's real good road racing numbers!!!!!!

[rob_e30]

I don't know about you, but I think that almost 20 psi (1.5 BAR = 21.75 psi) is a lot of boost, especially on a motor that will be racing for at least 30 minutes and up to 2 hours per session.  I wasn't saying you could not get to 400 on stock cams, but that it would be easier and you would have a broader power band with aftermarket.  We can adjust the cams, but that would move mainly move the band around... I like the low end power for pulling out of the corners, but need a broader curve and a more usable power band.  If I could increase our powerband by 1,000 RPM on the top and keep the low end similar to where it is then we'd be happy.

For us, the competition is race built S14's and M50/52's (up to 2.9L) and they're free to make all the cam, valve, ECU and other internal component changes including dry sump.  At 13PSI we're putting out competitive or better HP and torque with what we believe will be a lighter and better balanced platform.

[stereomotional]

For us, the competition is race built S14's and M50/52's (up to 2.9L) and they're free to make all the cam, valve, ECU and other internal component changes including dry sump.  At 13PSI we're putting out competitive or better HP and torque with what we believe will be a lighter and better balanced platform.

so your using stock cams?  u using an adjustable cam gear?

[strypt]

u using an adjustable cam gear?

All M42's has adjustable cam gears.

[stereomotional]

oh, good looking man .  this is my first motor build to im still learning alot