I had a quick look at your other thread.I assume you have a forged bottom,stock head,stock intake manifold.Not sure about the turbo manifold.
I have a thread on Speed-Talk(a place where engine builders discuss)about turbocharging the M30 and camshaft came on topic,of course.
I have all the OEM M30 camshaft at my disposal and intent to send one to the regrinder.There is no doubt the B35 camshaft is the best for
turbo application simply because it got the biggest lobe separation angle,meaning very little,none or even negative overlap.And plenty lobes
left for your desired profile.
Boost can further the torque curve higher in the RPM,to a point.The M30 is a formidable torque machine,and does spool a turbo rather quickly.
A more agressive camshaft would bleed off that precious low RPM action and the head,in stock trim(you got B34 right?) cannot take advantage of
hi RPM action anyway.
A guy on Speed-Talk been nice enough to compute something ressembling my M30(3400cc quenched hemi inline six with pitiful flow numbers and
a very restrictive turbo log(using 745i stuff),on a engine simulation software.This in turn gave us a desirable camshaft profile.Intent of this cam
is not to turn the M30 into a screamer.It's intent is to allow the M30 to deal with a generous quantity of boost.Which from the little I know about
your build is what you should aim at.
Here's the link to the thread: https://www.speed-talk.com/forum/viewto ... 15&t=63857
Been a while I looked at it but from what I remember,you want the B35 cam,advance it(adjustable cam sprocket) and have the intake opening
lobe ground if needed,depending how much you advanced the cam.Take it for what it's worth,this is rough data.Everybody more than welcomed
to discuss this.
I have two build on the shelves,one is my M106 I intent to make a responsive engine(fast spool)for a manual car.Second build I have three M102
waiting to be destroyed for science.These will be heavily ported,port floors will be epoxied and reshaped,zero fack given under 3500RPM.
It will use a automatic transmission(2004r) with a stall and a 50hp nitrous shot if needed.
The first engine use M30 attributes,low RPM torquey engine with good mixture motion.Stockish head,intake manifold,not so much porting.
The second engine(s),does not use M30 original attributes,will need intense porting,custome intake manifold,lots and lots of research and
you are pretty much on your facking own,this is no 2JZ with tons of knowledge and support,when wanting to push the enveloppe.
I'm getting off bat here but there it goes.From what I know about your build,that is forged bottom and stock heads.If you wanna go the
next step,you need the latest,baddest turbo.I guess you have ARP headstuds and a good gasket,oringed block or head.Get that B35 cam and
have it ground a couple degrees on intake opening and advance the cam a couple degrees,dunno how much.Have a good valve job done,
might want a little bowl job done,do not enlarge intake ports.Exhaust valve are suceptible to burn and crack,might want to upgrade.